PROJECT PLANNING MANUALHEATING AND COOLING WITH HEAT PUMPS

Active cooling with air-to-water and brine-to-water heat pumps Passive cooling with brine-to-water and water-to-water heat pumps Waste heat recovery in cooling operation for domestic hot water preparation and swimming pool heating

Certified quality

Edition 11/2008

Table of Contents

Table of Contents1 Selection and Dimensioning of Heat Pumps for Heating and Cooling..........................................................41.1 Calculating the Heat Consumption of the Building............................................................................................................................ 4

1.1.1 Utility Company Shut-Off Times ............................................................................................................................................... 41.1.2 DHW heating ............................................................................................................................................................................ 4

1.2 Method for Calculating the Cooling Requirements of the Building.................................................................................................... 5

1.3 Checking the Operating Limits .......................................................................................................................................................... 51.3.1 Maximum Heat Output of the Heat Pump................................................................................................................................. 51.3.2 Maximum Cooling Capacity of the Heat Pump......................................................................................................................... 7

1.4 Parallel Connection of Heat Pumps for Heating Purposes ............................................................................................................... 81.4.1 Heating / Cooling Operation Only ............................................................................................................................................. 81.4.2 Bivalent operation ..................................................................................................................................................................... 81.4.3 Swimming pool water preparation ............................................................................................................................................ 8

1.5 Parallel Connection of Heat Pumps for Cooling Purposes................................................................................................................ 81.5.1 Cooling Operation without Waste Heat Recovery .................................................................................................................... 81.5.2 Cooling Operation with Waste Heat Recovery ......................................................................................................................... 81.5.3 Measures to Reduce the Cooling Load of the Building............................................................................................................. 9

2 Generation of Refrigerating Capacity .............................................................................................................102.1 Passive Cooling .............................................................................................................................................................................. 10

2.1.1 Passive Cooling with Parallel Domestic Hot Water Preparation............................................................................................. 102.1.2 Passive Cooling with Ground Water ....................................................................................................................................... 112.1.3 Passive Cooling with Ground Heat Collectors Laid Horizontally ............................................................................................ 112.1.4 Passive Cooling with Borehole Heat Exchangers................................................................................................................... 11

2.2 Active Cooling ................................................................................................................................................................................. 122.2.1 Active Cooling with Reversible Air-to-Water Heat Pumps ...................................................................................................... 122.2.2 Active Cooling with Reversible Brine-to-Water Heat Pumps .................................................................................................. 12

3 Heating and Cooling with a Single System ....................................................................................................133.1 Energy-Efficient Operation .............................................................................................................................................................. 13

3.2 Regulation of a Combined Heating and Cooling System................................................................................................................ 13

3.3 Hydraulic Requirements of a Combined Heating and Cooling System........................................................................................... 13

3.4 Cooling Load................................................................................................................................................................................... 13

3.5 Dynamic Cooling ............................................................................................................................................................................. 133.5.1 Fan convectors ....................................................................................................................................................................... 143.5.2 Cooling with Ventilation Systems............................................................................................................................................ 14

3.6 Silent Cooling.................................................................................................................................................................................. 143.6.1 Underfloor Cooling.................................................................................................................................................................. 143.6.2 Cooled Ceilings....................................................................................................................................................................... 15

3.7 Thermal Activation of Structural Building Parts............................................................................................................................... 15

3.8 Comfort ........................................................................................................................................................................................... 153.8.1 Thermal Behaviour of Humans............................................................................................................................................... 153.8.2 Room Temperature................................................................................................................................................................. 153.8.3 Humidity Content in Indoor Air................................................................................................................................................ 163.8.4 Air Circulation within a Room.................................................................................................................................................. 16

4 Active Cooling with Air-to-Water Heat Pumps ...............................................................................................174.1 Air-to-water heat pumps for indoor installation................................................................................................................................ 17

4.2 Air-to-water heat pumps for outdoor installation ............................................................................................................................. 17

4.3 Device Information for Air-to-Water Heat Pumps for Indoor Installation ......................................................................................... 184.3.1 Reversible Air-to-Water Heat Pump in Compact Design - 230V ............................................................................................ 184.3.2 Reversible air-to-water heat pump - 230V.............................................................................................................................. 194.3.3 Reversible Air-to-Water Heat Pumps with Waste Heat Recovery .......................................................................................... 20

4.4 Device Information for Air-to-Water Heat Pumps for Outdoor Installation ...................................................................................... 214.4.1 Reversible air-to-water heat pumps - 230V ............................................................................................................................ 214.4.2 Reversible Air-to-Water Heat Pumps with Waste Heat Recovery .......................................................................................... 22

4.5 Characteristic Curves of Reversible Air-to-Water Heat Pumps....................................................................................................... 234.5.1 Characteristic Curves LIK 8MER (Heating Operation) ........................................................................................................... 234.5.2 Characteristic curves LI 11MER / LA 11MSR (Heating operation) ......................................................................................... 244.5.3 Characteristic Curves LI 11TER+ / LA 11ASR (Heating Operation)....................................................................................... 25

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4.5.4 Characteristic curves LI 16TER+ / LA 16ASR (Heating operation)........................................................................................ 264.5.5 Characteristic Curves LIK 8MER (Cooling Operation) ........................................................................................................... 274.5.6 Characteristic curves LI 11MER / LA 11MSR (Cooling operation)......................................................................................... 284.5.7 Characteristic Curves LI 11TER+ / LA 11ASR (Cooling Operation) ...................................................................................... 294.5.8 Characteristic Curves LI 16TER+ / LA 16ASR (Cooling Operation) ...................................................................................... 30

4.6 Dimensions of Reversible Air-to-Water Heat Pumps...................................................................................................................... 314.6.1 Dimensions LIK 8MER ........................................................................................................................................................... 314.6.2 Dimensions LI 11MER............................................................................................................................................................ 324.6.3 Dimensions LI 11TER+ .......................................................................................................................................................... 334.6.4 Dimensions LI 16TER+ .......................................................................................................................................................... 344.6.5 Dimensions LA 11MSR .......................................................................................................................................................... 354.6.6 Dimensions LA 11ASR........................................................................................................................................................... 364.6.7 Dimensions LA 16ASR........................................................................................................................................................... 37

5 Active Cooling with Brine-to-Water Heat Pumps .......................................................................................... 385.1 Designing Borehole Heat Exchangers for Heating and Cooling ..................................................................................................... 38

5.1.1 Dimensioning information - heat transfer into the ground ...................................................................................................... 385.1.2 Dimensioning of the brine circulating pump ........................................................................................................................... 385.1.3 Brine fluid ............................................................................................................................................................................... 38

5.2 Device information.......................................................................................................................................................................... 395.2.1 Reversible Air-to-Water Heat Pumps - 230V Single-Phase ................................................................................................... 395.2.2 Reversible Brine-to-Water Heat Pump................................................................................................................................... 405.2.3 Reversible brine-to-water heat pumps with waste heat recovery........................................................................................... 41

5.3 Characteristic Curves of Reversible Brine-to-Water Heat Pumps .................................................................................................. 425.3.1 Characteristic Curves SI 5MER (Heating Operation) ............................................................................................................. 425.3.2 Characteristic curves SI 7MER (Heating operation)............................................................................................................... 435.3.3 Characteristic curves SI 9MER (Heating operation)............................................................................................................... 445.3.4 Characteristic curves SI 11MER (Heating operation)............................................................................................................. 455.3.5 Characteristic Curves SI 75ZSR (Heating Operation)............................................................................................................ 465.3.6 Characteristic curves SI 30TER+ (Heating operation) ........................................................................................................... 475.3.7 Characteristic curves SI 75TER+ (Heating operation) ........................................................................................................... 485.3.8 Characteristic Curves SI 5MER (Cooling Operation) ............................................................................................................. 495.3.9 Characteristic curves SI 7MER (Cooling operation)............................................................................................................... 505.3.10 Characteristic curves SI 9MER (Cooling operation)............................................................................................................... 515.3.11 Characteristic curves SI 11MER (Cooling operation)............................................................................................................. 525.3.12 Characteristic Curves SI 75ZSR (Cooling Operation) ............................................................................................................ 535.3.13 Characteristic curves SI 30TER+ (Cooling operation) ........................................................................................................... 545.3.14 Characteristic curves SI 75TER+ (Cooling operation) ........................................................................................................... 55

5.4 Dimensions of Reversible Brine-to-Water Heat Pumps.................................................................................................................. 565.4.1 Dimensions SI 5MER - SI 11MER.......................................................................................................................................... 565.4.2 Dimensions SI 75ZSR............................................................................................................................................................ 575.4.3 Dimensions SI 30TER+.......................................................................................................................................................... 585.4.4 Dimensions SI 75TER+.......................................................................................................................................................... 59

6 Passive Cooling using a Heat Exchanger...................................................................................................... 606.1 Passive Cooling with Water-to-Water Heat Pumps ........................................................................................................................ 60

6.2 Passive Cooling with Brine-to-Water Heat Pumps ......................................................................................................................... 60

6.3 Device information.......................................................................................................................................................................... 616.3.1 Passive cooling station........................................................................................................................................................... 616.4.1 Characteristic Curves PKS 14................................................................................................................................................ 626.4.2 Characteristic Curves PKS 25................................................................................................................................................ 63

6.5 Dimensions..................................................................................................................................................................................... 646.5.1 Dimensions PKS 14 / PKS 25 ................................................................................................................................................ 64

7 Control and Regulation ................................................................................................................................... 657.1 Network Operation of Heating and Cooling Controllers and Remote Control................................................................................. 65

7.2 Temperature Sensor (Cooling Controller)....................................................................................................................................... 65

7.3 Cold Generation by Active Cooling................................................................................................................................................. 667.3.1 Heat Pumps without Additional Heat Exchangers.................................................................................................................. 667.3.2 Heat Pumps with Additional Heat Exchangers for Waste Heat Recovery.............................................................................. 66

7.4 Cold Generation via Passive Cooling ............................................................................................................................................. 66

7.5 Cooling Program Description.......................................................................................................................................................... 677.5.1 Cooling Operating Mode ........................................................................................................................................................ 677.5.3 Deactivation of Circulating Pumps in Cooling Operation........................................................................................................ 67

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Table of Contents

7.5.4 Silent and Dynamic Cooling.................................................................................................................................................... 68

7.6 Individual room regulation ............................................................................................................................................................... 687.6.1 Dynamic Cooling..................................................................................................................................................................... 687.6.2 Silent Cooling.......................................................................................................................................................................... 68

7.7 Hot water preparation...................................................................................................................................................................... 697.7.1 Request for Hot Water without Additional Heat Exchanger .................................................................................................... 697.7.2 Request for Hot Water with Additional Heat Exchanger ......................................................................................................... 697.7.3 Waste Heat Recovery in Cooling Operation ........................................................................................................................... 69

7.8 Special accessories ........................................................................................................................................................................ 697.8.1 Room climate control station .................................................................................................................................................. 697.8.2 Heating/cooling ON/OFF room temperature controller ........................................................................................................... 707.8.3 Remote control ....................................................................................................................................................................... 70

8 Comparison of Heat Pump Cooling Systems.................................................................................................718.1 Air-to-Water Heat Pumps with Active Cooling................................................................................................................................ 71

8.2 Brine-to-Water Heat Pumps with Active Cooling............................................................................................................................. 71

8.3 Brine-to-Water Heat Pumps with Passive Cooling.......................................................................................................................... 71

8.4 Water-to-Water Heat Pumps with Passive Cooling......................................................................................................................... 71

8.5 Summary......................................................................................................................................................................................... 72

9 Hydraulic Integration for Heating and Cooling Operation ............................................................................739.1 Legend ............................................................................................................................................................................................ 73

9.2 Active, dynamic cooling................................................................................................................................................................... 74

9.3 Active, silent cooling........................................................................................................................................................................ 75

9.4 Active cooling with waste heat recovery ......................................................................................................................................... 76

9.5 Passive Cooling with Brine-to-Water Heat Pumps.......................................................................................................................... 78

9.6 Passive Cooling with Compact Manifold ......................................................................................................................................... 79

9.7 Passive Cooling with Separate Heating and Cooling Circuits......................................................................................................... 80

9.8 Passive Cooling with Ground Water ............................................................................................................................................... 81

10 Electrical Installation ........................................................................................................................................8410.1 Cooling controller for reversible heat pumps................................................................................................................................... 84

10.2 Cooling controller for passive cooling ............................................................................................................................................. 84

10.3 Room temperature regulation with dynamic cooling ....................................................................................................................... 84

10.4 Room climate control station with silent cooling.............................................................................................................................. 85

10.5 Extended dew point monitoring....................................................................................................................................................... 85

10.6 Regulation of the Room Temperature............................................................................................................................................. 8610.6.1 Room temperature controller for manual switching ................................................................................................................ 8610.6.2 Room temperature controller with automatic switching .......................................................................................................... 86

10.7 Circuit Diagrams.............................................................................................................................................................................. 88

10.8 Legend for the circuit diagrams....................................................................................................................................................... 91

10.9 Heat pump manager terminal assignation ...................................................................................................................................... 92

11 Appendix............................................................................................................................................................9311.1 Glossary of Cooling Terms.............................................................................................................................................................. 93

11.2 Important Standards and Regulations............................................................................................................................................. 95

11.3 Estimated Calculation of the Cooling Load for Individual Rooms According to the HEA Method ................................................... 96

11.4 Minimum Requirements for Hot Water Cylinder / Circulating Pump ............................................................................................... 98

11.5 Order form for (heating/cooling) heat pump start-up....................................................................................................................... 99

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1 Selection and Dimensioning of Heat Pumps for Heating and Cooling

1.1 Calculating the Heat Consumption of the BuildingThe maximum hourly heat consumption his calculatedaccording to the respective national standards. It is possible toestimate the approximate heat consumption using the livingspace A (m2) that is to be heated:

Table 1.1: Estimated specific heat consumption values for Germany

Dimensioning flow temperaturesWhen dimensioning the heat distribution system of a heat pumpheating system, it should be borne in mind that the required heatconsumption should be based on the lowest possible flowtemperatures, because every 1 °C reduction in the flowtemperature for the same heating consumption yields a saving inenergy consumption of approx. 2.5 %. Extensive heatingsurfaces such as underfloor heating or fan convectors withmaximum flow temperatures of about 40 °C are ideal.

1.1.1 Utility Company Shut-Off TimesMany German utility companies offer a special agreement with alower electricity tariff when heat pumps are used. According tothe German Federal Tariff Ordinance, the utility company mayoffer such an agreement if it is able to switch off and block heatpumps at times of peak demand in the supply network.The heat pump is then no longer available for heating the houseduring these shut-off times. Therefore, surplus energy must beproduced during the periods in which the heat pump is notavailable for use. Hence, the heat pump should beoverdimensioned to allow for this.

Utility company shut-off times normally last up to 4 hours a day,which must be allowed for with a factor of 1.2. Shut-off times ofup to even 6 hours are permissible. These are then allowed forwith a factor of 1.3.

Table 1.2: Dimensioning factor f for taking shut-off times into consideration

1.1.2 DHW heatingTo meet normal requirements regarding comfort, allowanceshould be made for a peak hot water consumption of approx. 80-100 litres per person per day, based on a hot water temperatureof 45 °C. In this case, allowance should be made for a heatoutput of 0.2 kW per person.The maximum possible number of persons should be assumedwhen dimensioning, and any special usage (e.g. a spa bath)should also be taken into consideration.The heat pump manager regulates domestic hot waterpreparation. It activates hot water preparation depending onneed and on the type of operation. In the case of reversible heatpumps equipped with an additional heat exchanger, the wasteheat produced in cooling operation can be used for domestic hotwater preparation.When an electrically-operated flange heater is used in the hotwater cylinder for hot water preparation, this can be used in thecalculation of the design (e.g. -16 °C). In this case, the heatoutput for DHW preparation does not need to be added to theheating load.

Circulation pipesCirculation pipes immediately provide hot water at the extractionpoint, but this also considerably increases the amount of heatrequired for hot water heating. The increase in consumptionwhich should be allowed for is dependent on the runtime, the

length of the circulation pipes and the quality of the pipeinsulation. If a circulation system can not be dispensed withbecause of long pipe runs, a circulation pump should be usedwhich can be activated by a flow sensor, pushbutton, etc. ifrequired.

NOTEIn order to comply with paragraph 12 (4) of the German Energy EfficiencyOrdinance, circulation pumps in hot water systems must be equippedwith an automatic switch-on/switch-off mechanism.The surface-related heat loss of the domestic water distribution systemdepends on both the surface area and the type and position of thecirculation pipework. For a surface area ranging from 100 to 150 m² anddistribution within the thermal envelope, the surface-related heat lossesaccording to the German EnEV are:

9.8 [kWh/m² a] with a circulation system 4.2 [kWh/m²a] without a circulation system

ATTENTION!Circulation pipes increase the number of requests for hot water due toheat losses. In case of active cooling without additional heat exchangers,every request for hot water causes an interruption of the coolingoperation (see Chapt. 7.3 on pp. 66).

= 0.03 kW/m2 Low-energy house

= 0.05 kW/m2

acc. to German Heat Conservation Provision 95 or

the EnEV (Energy Saving Regulation) minimum insulation standard

= 0.08 kW/m2 for a house with normalthermal insulation (built approx. in 1980 or later)

= 0.12 kW/m2 for older walls withoutspecial thermal insulation

Blocking time (total) Dimensioning factor2 h 1.14 h 1.26 h 1.3

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Selection and Dimensioning of Heat Pumps for Heating and Cooling 1.3.1.2

1.2 Method for Calculating the Cooling Requirements of the BuildingCooling systems are used to prevent rooms from overheatingdue to the effects of undesired heat loads. The cooling capacityis determined primarily by the outdoor climate, the requirementsfor the indoor environment, the internal and external heat loads,as well as the orientation and the construction of the building.

ATTENTION!Due to the strong influence of solar radiation and internal heat loads, it isnot possible to make an estimate of the cooling requirements simply onthe basis of the surfaces to be cooled.

Internal loads include e.g. waste heat from appliances andlighting, as well as the occupants themselves. External loads aredefined as the heat input caused by solar radiation andtransmission heat gains from the surfaces enclosing rooms, aswell as ventilation gains caused by the entry of warmer air fromoutside.The cooling load in air-conditioned rooms is calculated accordingto the respective national standards. In Germany, for example,the national standard is VDI 2078 (VDI cooling load regulations).This guideline contains two calculation methods (the “shortmethod” and the computer method), as well as additionalinformation for calculating the cooling load of air-conditionedrooms and buildings. The computer method does not serve toimprove accuracy for standard conditions. However, it can beused to expand the range of applications to include almost any

boundary conditions (variable blind systems, room temperature,etc.). In actual use, this method is too complex for standardconditions.In the case of simple types of buildings such as offices, doctors'practices, shops or private residences, it is practical to make arough calculation with values based on past experience or usingthe so-called HEA short method from the German “Fachverbandfür Energie-Marketing und -Anwendung e.V.” (English: TradeAssociation for Energy Marketing and Use).

NOTEVisit www.dimplex.de to use our online planner to calculate theapproximate cooling load.

The values specified by this method are calculated on the basisof the VDI 2078 cooling load regulations (Chapt. 11.3 on pp. 96).The calculation is based on a room temperature of 27 °C, anexternal temperature of 32 °C and continuous operation of thecooler.

NOTEThe cooling requirements of the building are calculated by addingtogether the cooling loads of the individual rooms. Depending on the typeof building, a simultaneity factor can be used under certaincircumstances, because rooms on the east and west sides do not have todissipate solar heat loads simultaneously.

1.3 Checking the Operating Limits

1.3.1 Maximum Heat Output of the Heat PumpIf the heat consumption of the building is higher than its coolingrequirements, the heat pump should be configured for heatingoperation. It must then be checked whether the cooling output ofthe heat pump system is higher than the cooling requirement ofthe building.

Chapt. 1.5.3 on pp. 9 shows possibilities for reducing the coolingrequirements of the building calculated for each room.If the heat consumption of the building is lower than its coolingrequirements, the heat pump can also be configured for coolingrequirements and the heat pump can be combined with a secondheat generator during heating operation.

1.3.1.1 Monovalent operationIn this mode of operation, the heat pump covers the heatconsumption of the building throughout the whole year - 100 % -by itself. Brine-to-water and water-to-water heat pumps arenormally operated in monovalent mode. Refer to the DeviceInformation of the respective device for the actual heat outputs ateach respective flow temperature and minimum heat sourcetemperatures.

Table 1.3: Example of calculating the heat output

1.3.1.2 Mono Energy OperationAir-to-water heat pumps are primarily operated in mono energysystems. The heat pump should cover at least 95 % of the heatconsumption. At lower temperatures and high heat consumption,an electrically operated immersion heater is switched onautomatically.In the case of mono energy systems, dimensioning of the heatpump output has a particularly strong influence on the level of theinvestment and the annual heating costs.

The higher the annual energy demand for heating met by theheat pump, the greater the investment costs and the lower theannual operating costs.Experience has shown that in Germany, a heat pump outputshould be selected which cuts the heating characteristic curve ata theoretical limit temperature (or bivalence point) of approx. –5 °C.According to the DIN 4701 T10 standard, this yields a 2 % ratiofor the 2nd heat generator (e.g. immersion heater) whenoperated as a bivalent-parallel system.

Brine-to-waterheat pump

Water-to-waterheat pump

Maximumflow temperature 35°C 35°C

Minimum heat source temperature

Brine 0 °C Ground water 10 °C

Operating point for determination of the heat output

B0 / W35 W10 / W35

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1.3.1.3

Example from Table 1.4 on pp. 6A bivalence point of -5 °C yields a heat pump proportion ofapprox. 98 % for a bivalent-parallel (mono energy) mode ofoperation.

Table 1.4: Coverage ratio of the heat pump of a mono energy system or a system operated bivalently according to bivalence point and mode of operation (source: Table 5.3-4 DIN 4701 T10)

Example:A reversible air-to-water heat pump operated in mono energymode LA 16ASR with immersion heater in the buffer tank, amaximum daily shut-off time of 2 hours and central domestic hotwater preparation for 5 persons.

Heat consumption of house to be heated 13.5 kW

Additional heat requirement for hot water preparation 1 kW

(Heat consumption + hot water preparation) x shut-off time factor= (13.5 kW+ 1 kW) x 1.1 ≈ 16 kW

The calculated value (16 kW) is equal to the required heat outputof the heat pump. It is entered in the heat output diagram of theheat pump on the basis of the standard outside temperature (e.g.-16 °C according to EN 12831) at the selected flow temperature(35 °C) point 1.The heat pump is dimensioned on the basis of the heatconsumption of the building in relation to the outsidetemperature. It is entered in the heat output diagram of the heatpump in simplified form as a straight line. When using thisprocedure, it is assumed that no more heat output (straight line 2)will be required above an external temperature of 20 °C (= airintake temperature of the heat pump).The intersection of the dotted straight line (end point at 20 °C /0 kW) and the heat output curve determines the theoreticalbivalence point (-5 °C) (point 3).The bivalence point is often lower in practice because of actualusage (e.g. unheated bedrooms, reduced temperature in ahobby room).

Dimensioning the immersion heater Total heat consumption on the coldest day

– Heat output of the heat pump on the coldest day= Output of the supplementary electric heating system

Example:

In the selected example, an LA 16ASR should be dimensionedwith heating elements that have an electrical output of 7.5 kW forthe selected example.

Fig. 1.1: Heat output curve for heating water flow temperatures of 35 °C

1.3.1.3 Bivalent-Parallel OperationWhen a system is operated as a bivalent-parallel system (e.g.existing older building), the heat pump is combined with a secondheat generator (e.g. oil or gas boiler). The heat pump controlleractivates the second heat generator below an adjustableexternal temperature (bivalence point < 4°C) as required.In the case of large systems with high heat consumption, heatpumps can meet a large proportion of the annual heat output witha relatively low heat output. The heat output of the heat pumpshould be dimensioned so that the heat pump can meet therequired heat output independently during transition periods. Ifthere is increased heat consumption, the controller switches onthe second heat generator according to need. The large numberof heat pump operating hours results in clear savings. Theefficiency of the second heat generator (e.g. oil boiler) is alsoimproved because short runtimes are eliminated.A prerequisite for a bivalent system is that the system should beplanned for long-term operation as a bivalent system.

NOTEExperience has shown that, in the case of bivalent systems used inmodernisation projects, the existing oil or gas boiler is taken out ofservice after a few years, for a variety of reasons. Therefore,dimensioning in the renovation sector should always be carried outanalogous to the mono energy system (bivalence point is approx. -5 °C).At the same time, the buffer tank should also be integrated into the heatflow. This enables problem-free conversion of the system to mono energyoperation at a later date.

Bivalence point [°C] -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5Coverage ratio [-] for biv.-paral. operation 1.00 0.99 0.99 0.99 0.99 0.98 0.97 0.96 0.95 0.93 0.90 0.87 0.83 0.77 0.70 0.61

Coverage ratio [-] for biv.- altern. operation 0.96 0.96 0.95 0.94 0.93 0.91 0.87 0.83 0.78 0.71 0.64 0.55 0.46 0.37 0.28 0.19

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Selection and Dimensioning of Heat Pumps for Heating and Cooling 1.3.2

1.3.1.4 Bivalent renewable operating modeThe heat pump manager has a separate operating mode for theintegration of renewable heat sources such as solid fuel boilersor thermal solar energy systems. The “bivalent-renewable”operating mode can be chosen during the preconfiguration. Inthis operating mode, the heat pump heating system respondslike a mono energy system; when heat is supplied by therenewable heat source, the heat pump is automatically blockedand the heat generated by the renewable heat source is mixedinto the heating system. The mixer outputs of the bivalence mixer(M21) are active.If the temperature in the renewable cylinder is high enough, theheat pump is also blocked during domestic hot water preparationor swimming pool requests. Heat pumps which are not equipped with a flow sensor (R9) mustbe retrofitted.

ATTENTION!In reversible heat pumps or heat pump heating systems with a thirdheating circuit, “bivalent-renewable” is not available since the sensor(R13) is already in use.

Fig. 1.2: Circuit diagram for heating operation with a solid fuel boiler

1.3.2 Maximum Cooling Capacity of the Heat PumpIf the maximum required cooling capacity of a building is alreadyknown (see also Chapt. 1.2 on pp. 5), it must be checked toensure that the heat pump can supply this refrigerating capacityunder the required boundary conditions. It is particularlyimportant to check the operating limits of the particular type ofheat pump used.The cooling capacity of passive cooling systems (see Chapt. 2on pp. 10) is based on the type and dimensioning of the coldsource (e.g. borehole heat exchanger), the volume flow and theinstalled heat exchanger (see Device Information in Chapt. 6 onpp. 60).The cooling capacity of a reversible air-to-water heat pump ischiefly dependent on the required flow temperature and theoutside air temperature. The higher the flow temperature and thelower the external temperature, the greater the cooling capacityof the heat pump.

Example:What cooling capacity is available according to the output curvein Fig. 1.3 on pp. 7 at a max. external temperature of 35 °C?

Fig. 1.3: Cooling capacity of a reversible heat pump (see also Chapt. 4.5.8 on pp. 30)

According to Fig. 1.3 on pp. 7, this yields the following maximumcooling capacities based on flow temperatures in coolingoperation:

Type of heat pump Flow temp. Cooling capacity

Air-to-water 18°C 14.3 kWAir-to-water 8°C 10.7 kW

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1.4

1.4 Parallel Connection of Heat Pumps for Heating PurposesA higher heat consumption can be met by connecting heatpumps in parallel. Different heat pump types can be useddepending on the need. Large systems with more than three heatpumps switched in parallel are normally switched anddisconnected using a higher-level load management system.

A parallel connection of heat pumps is also possible without ahigher-level regulation system through the existing heat pumpmanager:

1.4.1 Heating / Cooling Operation OnlyThe same heating curves / return flow set temperatures are setfor all heat pump managers. The set hysteresis and the switchingcycle blocks defined by the control system lead to an interactionof the individual heat pumps.If heating operation via one heat pump is perferred, then a lowerreturn flow set temperature is set for the remaining heat pumps.A maximum deviation of the different return flow set

temperatures which corresponds to the hysteresis (e.g. 1-2K) isrecommended.

NOTEWith parallel connection, the same heating curve should be set on all heatpump managers. The priorities can be influenced, e.g. in order tocompensate the number of operating hours, by altering the indicator barvia the arrow keys “Hotter” and “Colder”.

1.4.2 Bivalent operationThe boiler must not be put into operation until all heat pumps areactive. In order to ensure this, the heat pump manager whichgives the release signal for the boiler is allocated the lowesttarget value.In bivalent systems with DHW preparation, the hydraulic andcontroller-related allocation of the boiler to a single heat pumpmakes the parallel operation of heating and DHW preparationpossible (Fig. 1.4 on pp. 8).

NOTEWhen dimensioning the hydraulics, special attention must be paid to therequired heating water flows of the individual heat generators.

Fig. 1.4: Parallel Connection with Bivalent DHW Preparation

1.4.3 Swimming pool water preparationThe swimming pool request is processed when neither a heatingrequest nor a hot water request is present. For this reason, theswimming pool preparation should be switched to the heat pumpwhich was the last to be connected in heating operation.

NOTEIn systems with swimming pool water preparation, the return flow sensorin the heating circuit must be switched to an additional sensor in theswimming pool circuit during swimming pool water preparation.

1.5 Parallel Connection of Heat Pumps for Cooling PurposesA higher cooling requirement can be met by connecting heatpumps in parallel. Reversible heat pumps - with and withoutadditional heat exchangers - can also be combined according to

need. For efficient operation, priority should be given to the useof heat pumps with waste heat recovery (Chapt. 7.3.2 on pp. 66).

1.5.1 Cooling Operation without Waste Heat RecoveryThe same return flow set temperatures are set for all heat pumpmanagers. The set hysteresis, as well as the switching cycle

blocks defined by the control system, lead to an interaction of theindividual heat pumps.

1.5.2 Cooling Operation with Waste Heat RecoveryThe additional heat exchanger installed in the cooling circuit ofthe heat pump makes it possible for the waste heat produced incooling operation to be used for DHW and swimming pool waterpreparation. If reversible heat pumps with and without additionalheat exchangers are combined, the heat pump with an additional

heat exchanger is allocated the lower target value so that thewaste heat can be used with priority.

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Selection and Dimensioning of Heat Pumps for Heating and Cooling 1.5.3

1.5.3 Measures to Reduce the Cooling Load of the BuildingThe building's cooling load is calculated by adding up the coolingloads of the individual rooms. If this sum exceeds the availablecooling capacity, check the following:

Can the cooling load be reduced through simple buildingmeasures (e.g. by using external sunblinds)?Can the same cooling capacity also be supplied at higherflow temperatures by increasing the surface area of the heatexchanger?Are the calculated maximum cooling loads of the individualrooms actually to be calculated as being simultaneous,because, for example, rooms on the east and west sides arenot heated simultaneously by solar radiation?Can the cooling load be reduced during the day by coolingparts of the building's structure at night (thermal activation ofstructural building parts)?

If despite these measures, the cooling capacity of the heat pumpis still not sufficient, rooms with high heat loads can be equippedwith supplementary air conditioners. For reasons of energyefficiency, these air conditioners should only operate when theheat pump can not cover the total cooling load.

NOTEIn cooling operation, heat pumps normally make use of special tariffsfrom the utility companies (see Chapt. 1.1.1 on pp. 4). During shut-offtimes, cooling operation must be ensured using suitable cooling storage(e.g. thermal activation of structural building parts) (see Chapt. 3.7 onpp. 15). If this is not possible, an electricity tariff without shut-off timesmust be selected.

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2

2 Generation of Refrigerating Capacity

2.1 Passive CoolingIn the summer, the ground and the ground water are significantlycolder at greater depths than the ambient temperature. A plateheat exchanger installed in the ground water or brine circuit,

transfers the refrigerating capacity to the heating and coolingcircuit. The heat pump compressor is not active and is thereforeavailable for domestic hot water preparation.

2.1.1 Passive Cooling with Parallel Domestic Hot Water Preparation1) The compressor raises the temperature level of the

refrigerant circulating in a closed cycle. This increases thetemperature of the gaseous refrigerant.

2) Heat is transferred to the heating water in the liquefier (heatexchanger). The refrigerant cools and volatilises.

3) The refrigerant expands in the expansion valve (drops inpressure) and continues to cool down.

4) Borehole heat exchangers utilise the constant temperaturelevel in the deeper ground layers as a heat source fordomestic hot water preparation and as a cold source forpassive cooling.

5) The environmental energy absorbed by the borehole heatexchanger is transferred to a refrigerant in the evaporator(heat exchanger). The refrigerant heats up and evaporates.

6) For parallel operation of central domestic hot waterpreparation and passive cooling, both systems arehydraulically isolated from each other by reversing valves.

7) The cooled heating water flows through the fan convectorwhich extracts heat from the indoor air (dynamic cooling).

8) Cooled water flows through a pipe system laid in the floor,walls or ceiling. This cools the surface of the structural partof the building (silent cooling).

9) Reversing valves direct the heating water via the passiveheat exchanger and thus cool it down.

10) By activating the brine-to-water circulating pump for coolingpurposes, the energy of the heating water is transferred viaa heat exchanger to the brine circuit and discharged into theground.

Fig. 2.1: Passive cooling cycle with parallel domestic hot water preparation

10

Generation of Refrigerating Capacity 2.1.4

2.1.2 Passive Cooling with Ground WaterIn compliance with the VDI 4640 standard, most regionswelcome a cooling of the ground water e.g. through the use of aheat pump for heating purposes. Increasing the temperature bycooling, on the other hand, is only acceptable within strict limits. A temperature of 20 °C should not be exceeded when the heat isdischarged into the ground water. In addition, the temperaturechange of the ground water returned to the absorption well mustnot exceed 6 K.

Summary:Passive cooling with ground water is a feasible option. The heatexchanger and the flow rate should be dimensioned so that thewater returned to the absorption well is heated by a maximum of6 K. The widely differing requirements made by the respectiveregional water authorities must also be adhered to. A wateranalysis must be carried out in order to ascertain the materialcompatibility with the installed heat exchanger.

2.1.3 Passive Cooling with Ground Heat Collectors Laid HorizontallyNormally, ground heat collectors laid horizontally close to thesurface are not a reliable cold source for passive cooling. Fig. 2.2on pp. 11 illustrates the annual temperature curve. It shows thatthe summer temperatures close to the surface are too high foreffective cooling operation. On August 1st, the collectortemperature is already over 15 °C even without heat beingdischarged.The temperature of the collector increases due to the dischargedwaste heat and functions as a kind of energy store. According toVDI 4640 Parts 3, 3.2, this can have negative effects on the floraand fauna found on the surface.

NOTEThe use of a ground heat collector for cooling requirements can causethe ground around the collector to dry out. The ground shrinkage causedby this in turn leads to a reduction in the contact between the ground andthe ground heat collector. This adversely affects heating operation.

Fig. 2.2: Ground temperatures close to the surface in °C for undisturbed ground.

2.1.4 Passive Cooling with Borehole Heat ExchangersBorehole heat exchangers utilise the constant temperature level(approx. 10 °C) in the deeper ground layers as a cold source forcooling. Because these systems use a closed cycle, no waterauthority regulations must be fulfilled (see Fig. 2.1 on pp. 10).

NOTEThe temperature level in big cities is often considerably lower than that inmore rural areas, which can mean that passive cooling is not possible.

The transferable refrigerating capacities are normally sufficientfor use on residential properties because cooling is onlynecessary a few days each year. Permanent cooling e.g. ofcommercial properties or of large cooling loads due to internalheat loads (e.g. light/personnel/electrical devices) will graduallyheat up the borehole heat exchanger and reduce its maximumcooling capacity.

NOTEIf set cooling capacities must be guaranteed or the annual coolingconsumption exceeds the annual heating consumption, the boreholeheat exchanger must be dimensioned for both heating and coolingoperation. A precise calculation of the output taking heating the boreholeheat exchanger into account, can only be made on the basis of anumerical simulation carried out using an appropriate software package.Both geological and hydro-geological knowledge is also required.

Fig. 2.3: Passive cooling station for brine-to-water heat pumps

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2.2

2.2 Active CoolingHeat pumps for heating and cooling purposes operate with arefrigerating circuit which can be reversed using a four-wayreversing valve. In the case of these reversible heat pumps, anexisting temperature level becomes 'active', i.e. it is cooled usingthe compressor output of the heat pump. The criterion for switching the heat pump on and off in coolingoperation is the return flow temperature. The actual return flow

temperature is derived from the generated refrigerating capacityand the water flow produced in the generator circuit.

NOTESwitching the heat pump on in cooling operation is only possible withreturn flow temperatures of more than 12 °C, in order to prevent theminimum possible flow temperature of 8 °C from being undershot.

2.2.1 Active Cooling with Reversible Air-to-Water Heat PumpsReversible air-to-water heat pumps utilise the inexhaustiblesupplies of outside air for both heating and cooling. This meansthat within the operating limits, it is only necessary to calculatethe maximum cooling load, not the total cooling requirements ofthe entire cooling season. The refrigerating circuit of the heatpump can generate flow temperatures between 8 °C and 20 °Cat an external temperature above 15 °C. These can bedistributed in the building using a water-bearing pipe system.

Fig. 2.4: Operating limits for a reversible air-to-water heat pump

2.2.2 Active Cooling with Reversible Brine-to-Water Heat PumpsActive cooling with reversible brine-to-water heat pumps andborehole heat exchangers is generally permissible up to a brinetemperature of 21 °C in the heat exchanger (average weeklyvalue) or a peak value of 27 °C. Active cooling enables anincrease in the cooling capacity and yields constant flowtemperatures. The maximum available cooling capacity for acooling season should be dimensioned as for passive cooling.

Heat exchanger designThe borehole heat exchanger, which in heating operation servesas a heat source for the brine-to-water heat pump, should bedesigned according to the refrigerating capacity of the heat

pump. This can be calculated using the heat output minus theelectric power consumption of the heat pump as calculated in thedesign.The heat output to be discharged in cooling operation iscalculated using the cooling output of the heat pump plus theelectric power consumption of the heat pump as calculated in thedesign.

NOTEThe heat output transferred to the borehole heat exchanger in activecooling operation is higher than the refrigerating output extracted inheating operation.

Temperature outside air Minimum Maximum

Heating -25°C +35°CCooling +15°C +40°C

Flow temperature Minimum Maximum

Heating +18°C +55°CCooling +8°C +20°C

12

Heating and Cooling with a Single System 3.5

3 Heating and Cooling with a Single System

3.1 Energy-Efficient OperationIn the same way that national standards demand building andsystem-specific measures for reducing the heating energyconsumption, measures should also be taken to save energy bythermally insulating buildings for the warm summer months. Cooling loads in any room that can nevertheless not be avoidedusing such measures can be discharged by introducing cooledair, by cooling the air using a heat exchanger installed in theroom or by directly cooling structural parts of the building.

NOTEIn order to increase effectiveness, dimensioning of the combined heatingand cooling system should be implemented with heating water temperaturesthat are as low as possible and cooling water temperatures that are as highas possible.

In the case of reversible heat pumps with additional internal heatexchangers, the waste heat produced in cooling operation canbe used for domestic hot water preparation and for supplyingadditional heat consumers. This will lower the total primaryenergy consumption.

3.2 Regulation of a Combined Heating and Cooling SystemThe heat pump regulation system - the so-called heat pumpmanager - is capable of regulating a combined heating andcooling system and distributing the waste heat produced incooling operation to the available heat consumers (e.g. domestichot water preparation) (see Chapt. 7 on pp. 65).

Two different temperature levels are available in coolingoperation: Constant return temperatures for dynamic cooling(see Chapt. 3.5 on pp. 13) and reference dew point-controlledflow temperatures for silent cooling (see Chapt. 3.6 on pp. 14).

3.3 Hydraulic Requirements of a Combined Heating and Cooling SystemIn heating operation, the heat output generated by the heat pumpis transferred to a water-bearing pipe system via the circulatingpump. Switching to the cooling mode transfers the generatedrefrigerating capacity to the heat distribution system which is alsodesigned for distributing cold water (see Chapt. 9 on pp. 73).Making double use of the distribution system reduces theadditional investment costs for cooling.

Depending on the type of cooling distribution system installed,cooling water flow temperatures can be reduced to a minimum ofapprox. 16 °C to 18 °C for surface cooling systems and approx.8 °C for fan convectors.

ATTENTION!A combined heating and cooling system must be insulated to prevent theformation of moisture in cooling operation.

3.4 Cooling LoadThe total capacity of the chiller is equal to the sum of thesensitive and latent cooling capacities transferred from thecooling system. The cooling load is the sum of all actingconvective heat flows which must be discharged if the desired airtemperature in a room is to be maintained.

The sensitive cooling load is the heat flow which must bedischarged from the room to maintain a desired airtemperature with a constant humidity content. It is equal tothe sum of the calculated convection heat flows.

The latent cooling load is the heat flow required tocondense a mass flow of steam at air temperature so thatthe desired humidity content in the room can be maintainedat a constant air temperature.

NOTEIf the cooling water temperatures are above the dew point, no condensateis produced and the total cooling load is equal to the sensitive coolingload.

3.5 Dynamic CoolingThe indoor air flows through a heat exchanger in which thecooling water circulates. The use of flow temperatures below thedew point enables the transfer of greater cooling capacities byreducing the sensitive stored heat in the indoor air andsimultaneously dehumidifying it by producing condensate (latentheat).

NOTEA climate controller which has particular requirements regarding thehumidity in a room can only be used in combination with an air-conditioning system with active humidification and dehumidification.

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3.5.1

3.5.1 Fan convectorsFan convectors that are designed as case, wall or cassettedevices offer the option of dynamic cooling using adecentralized, modular system. Integrated ventilators ensuremulti-level controllable air recirculation, variable coolingcapacities and short response times. Fan convectors are not onlyused solely to cool the air, they can also be used for combinedheating and cooling.The cooling capacity of a fan convector is essentially dependenton the size, air volume flow, the relative humidity of the ambientair as calculated in the design, and the cooling water flowtemperature and spread. If the requirements in the DIN 1946 T2standard are taken into consideration when the device isdimensioned, specific cooling capacities ranging from 30 to60 W/m² are feasible. By following the standard practice ofdimensioning the device for a medium fan level, the user has theoption of reacting quickly to varying heat loads (fast fan level).

NOTETo ensure the minimum water flow rate through the chiller for all possibleoperating conditions, we recommend the use of fan convectors. Theseregulate using different fan levels, but do not reduce or block the waterflow. The recommended design temperature is 10 °C / 14 °C.

Fig. 3.1: Fan convector for heating and cooling

3.5.2 Cooling with Ventilation SystemsBesides dissipating heat loads, the required minimum airexchanges must also be ensured during cooling. A controlleddomestic ventilation unit is a useful supplement to the coolingand can permit a defined exchange of air.If necessary, the fresh air flow can be heated or cooled using so-called heating and cooling coils.

NOTEOpen windows should not be used for continuous ventilation in coolingoperation for the following reasons:

It increases the heat load of the room The cooling capacity is often insufficient,

particularly with silent cooling There is danger of condensate forming in the ventilation area

around the window

3.6 Silent CoolingSilent cooling works by absorbing heat from cooled floor, wall orceiling surfaces. The refrigerant temperatures are above the dewpoint to prevent the formation of condensate on the surface. Thetransferable cooling capacities depend largely on externalinfluencing factors (e.g. humidity).With silent cooling, pipes with water flowing through them whichare integrated into the surfaces surrounding rooms (e.g. walls)are used.

NOTEWhen existing panel heating systems (e.g. underfloor heating) are usedfor cooling, there are only minor additional investment costs. The flowtemperatures should be set above the dew point to prevent draughts anda too larger difference in temperature to the external temperature (sickbuilding syndrome).

3.6.1 Underfloor CoolingNew buildings can be also cooled with panel heating duringwarmer times of the year with relatively low additional regulationand system-specific costs. According to the “Taschenbuch fürHeizung und Klimatechnik” (English: Paperback for Heating andAir-Conditioning Technology), the cooling capacity of the floor islimited by the minimum permissible air temperature, inaccordance with DIN 1946 T2, of 21 °C at a height of 0.1 m andthe permissible vertical air temperature gradient of 2 K/m.This results in an average cooling capacity of approx. 25 to 35 W/m². If the sun shines directly on the floor, for example, in front ofFrench windows, this value can rise to peak values of up to 100W/m².

ATTENTION!The floor construction must be approved by the manufacturer as suitablefor cooling. This applies particularly to screed floors.

14

Heating and Cooling with a Single System 3.8.2

3.6.2 Cooled CeilingsA cooled ceiling is a high-capacity and convenient solution fordissipating heat. We would normally recommend combining theuse of a cooled ceiling with a ventilation system to limit theambient air humidity. The performance of a cooled ceilingdepends on its design (closed, open or cooled ceiling panels).The cooling surface absorbs the sensitive heat from the room

through radiation and convection. Depending on the system, thespecific cooling capacity can be 40 to 80 (max. 100 W/m²) for anenclosed ceiling, or up to 150 W/m² for open ceilings on accountof the higher convection rate. When planning and designing thesystem, it is particularly important to prevent unwanted draughts.

3.7 Thermal Activation of Structural Building PartsWhen designing the thermal activation of structural buildingparts, specialist planning must be undertaken to make use of theproperties of unpanelled storage mass in a building to store andemit thermal energy as required. The water circulating in thepipes charges the concrete heat storage mass for the followingday to enable automatic energy compensation depending on theroom temperature. Individual, instantaneous and room-oriented

temperature regulation is not possible due to the inertia of thesystem. The attainable cooling capacity is approx. 25 to 40 W/m²over a limited usage period of approx. 10 h. This delays theprogression of the room temperature. To dissipate higherthermal loads or instantaneous peak values, we recommendusing a combination with cooled ceiling panels or coolingconvectors as well as an air-conditioning system.

3.8 Comfort

3.8.1 Thermal Behaviour of HumansHumans generate heat to maintain their bodily functions. Theheat is produced by burning the absorbed nutrients with inhaledoxygen. If the performance of the human body increases, thequantity of transferred thermal energy also increases. Table 3.1on pp. 15 shows the heat transfer based on different humanactivities. When performing light office work, a person of averageresilience and size has an average heat transfer of approx.120 Watt. The same person has a heat transfer of 150 Wattswhen performing light house work or light manual work, and over200 Watt for the performance of moderately heavy or heavywork.

Table 3.1: Heat transfer per person

3.8.2 Room TemperatureThere is no definitive room temperature, for example 20 °C, atwhich a person feels most comfortable. Comfort is alsodependent on a large number of other factors, particularly themean temperature of the space-enclosing surfaces including theheating surfaces, as well as clothing and activity. This type oftemperature data is always dependent on certain averageconditions. A comfortable room temperature is always strongly dependenton the external temperature. Fig. 3.2 on pp. 15 represents therange of comfortable room temperatures. The internal coolingtemperature should normally be only approx. 3 to 6 °C below theexternal temperature, because, otherwise, a “cold shock” canoccur when moving from the warm outdoors to the cold indoors(sick building). Raising the maximum permissible roomtemperature based on external temperatures will result in apronounced lowering of peak output.

Fig. 3.2: Range of comfortable temperatures

Degree of activity Activity Examples

Heat transfer per person (sensitive

and latent)

I Static activity such as reading or writing while sitting 120 W

IILight work such as work in a laboratory, typing, or carrying out similar types of light work

when sitting or standing

150 W

III Light manual work 190 W

IV Moderately heavy to heavy manual work Over 200 W

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3.8.3

3.8.3 Humidity Content in Indoor AirHumans do not perceive humidity directly. For this reason,humans feel comfortable within a relatively wide humidity rangeof between approx. 35 and 70 %. The upper humidity limit isspecified in DIN 1946, Part 2, as 11.5 g of water per kg of dry air,whereby the relative humidity must not exceed 65 %. Fig. 3.3 onpp. 16 specifies - in relation to the room temperature - whichrelative humidity values are perceived as being comfortable.Higher humidity values are permissible when room temperaturesare low, because less moisture evaporates on the surface of thebody meaning that no additional heat is transferred. In contrast,additional heat transfer is desired at high room temperaturesand, therefore, lower humidity values are permissible in thiscase.

Fig. 3.3: Comfort in relation to the relative humidity of the ambient air and the room temperature

3.8.4 Air Circulation within a RoomThe air circulation also influences whether a person feelscomfortable. Air velocities that are too high are noticeable in theform of draughts. These are particularly unpleasant if thetemperature difference between body temperature and theinblown fresh air is too large, because this results in a greaterheat exchange on the surface of the body. The parts of the bodyaffected by the inblown fresh air is also important. The neck andfeet are particularly sensitive. For the occupants of lounges andespecially lecture theatres, we recommend supplying fresh airfrom the front, for this reason. Air velocities of over 0.2 m/secshould generally be avoided in occupied areas. Note that withdynamic cooling (e.g. fan convectors) the number of airexchanges (volume flow / room volume) should be between 3and 5, and should generally not exceed a value of 10.

Fig. 3.4: Area of comfort in relation to air velocity and room temperature (relative humidity 30-70 %, temperature of the surfaces enclosing rooms 19 °-23 °C)

16

Active Cooling with Air-to-Water Heat Pumps 4.2

4 Active Cooling with Air-to-Water Heat PumpsRecommended InstallationThe air-to-water heat pump should preferably be installedoutdoors. This is a simple, economical installation optionbecause the requirements placed on the foundations are minimaland this set-up avoids the need for air ducts. Installation is to bedone in compliance with the regulations set down in the relevantfederal building codes. If outdoor installation is not possible, it

should be kept in mind that condensation can form on the heatpump, on air ducts and especially around wall openings when theheat pump is installed in rooms with high humidity.

NOTEThe requirements for using the air as a heat source in heating operationcan be found in the Dimplex product planning and installation manual.

4.1 Air-to-water heat pumps for indoor installationCosts for indoor installation

Air circuit (e.g. ducts)Wall openingsCondensate outflow

GeneralAn air-to-water heat pump should not be installed in the livingquarters of a building. In extreme circumstances, outside air ascold as -25 °C may pass through the heat pump. This can lead tothe formation of condensation in the area around wall openingsand air duct connections in rooms with high humidity, e.g.kitchens and laundry rooms, eventually resulting in damage tothe building. The formation of condensation cannot be avoided(even with good thermal insulation) if the ambient air humidityexceeds 50 % and the external temperature is below 0 °C.Unheated rooms such as cellars, storerooms, and garages aretherefore more suitable installation locations.

NOTEFor a higher degree of sound protection, the air outlet should be over a90° bend, or outdoor installation should be selected.

If the heat pump is installed on an upper storey, the load-bearingcapacity of the ceiling should be checked. Installation on woodenfloors is not recommended.

NOTEIf the heat pump is installed above inhabited rooms, constructionalmeasures for solid-borne sound insulation are required.

Air circuitAir-to-water heat pumps installed indoors must be supplied witha sufficient air volume flow to ensure efficient and smoothoperation. This is based primarily on the heat output of theswimming pool heat pump and lies between 2.500 and 9.000m³/h. The minimum dimensions for the air duct must be observed.The air circuit from the air intake to the heat pump to the air outletshould be constructed in such a way that the air flow is impededas little as possible to avoid unnecessary drag.

4.2 Air-to-water heat pumps for outdoor installationCosts for outdoor installation

Frost-proof foundationLaying insulating heating pipes for flow and return flow in thegroundLaying electrical connecting and main cables in the ground.Wall openings for connecting pipesCondensate outflow (frost-proof)Follow federal building codes if applicable

InstallationHeat pumps for outdoor installation are equipped with speciallycoated panels and are therefore weatherproof.The device should always be installed on a permanently evenand horizontal surface. Frost-proof paving slabs or foundationsare suitable as a base. The entire frame should lie directly on theground to ensure a good soundproof seal and to prevent thewater-bearing components from becoming too cold. If there areany gaps, these should be sealed with weatherproof insulatingmaterial.

Minimum clearancesIt must be possible to carry out maintenance work withouthindrance. This can be ensured by maintaining a clearance of1.2 m from any solid walls.

Sound insulation measuresThe lowest noise emissions are achieved if, from the air outletside at a surrounding distance of 3-5 meters, there is no soundreflection through reverberative surfaces (i.e. facade). Additionally, the foundation can be covered up to the height ofthe covering panels with sound-absorbing material (e.g. barkmulch).

NOTENoise emissions from heat pumps depend on their respective soundpower levels and the installation conditions.

Air short circuitThe heat pump must be installed in such a way that the air cooledby the extraction of heat is blown out freely. In cases ofinstallation close to a wall, the air outlet must not face towardsthe wall.Installation in a hollow or in an inner courtyard is not permittedbecause cooled air collects at ground level and is drawn in againby the heat pump during lengthy operation.

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4.3

4.3 Device Information for Air-to-Water Heat Pumps for Indoor Installation

4.3.1 Reversible Air-to-Water Heat Pump in Compact Design - 230V

Device information for air-to-water heat pumps for heating purposes1 Type and order code LIK 8MER

2 Design2.1 Model / installation location: Compact / indoor2.2 Degree of protection according to EN 60 529 for compact devices and heating

components IP 20

3 Performance data3.1 Operating temperature limits:

Heating water flow / return flow °C / °C up to 58 / above 18Cooling, flow °C +7 to +20Air Heating / Cooling °C / °C -25 to +35 / +15 to +40

3.2 Temperature spread of heating water at A7 / W35 10.0 5.0

3.3 Heat output / COP at A-7 / W35 1 kW / ---

1. This data indicates the size and capacity of the system according to EN 255 and EN 14511. For an analysis of the economic and energy efficiency of the system, other parameters,in particular the defrosting capacity, the bivalence point and regulation, should also be taken into consideration. The specified values, e.g. A2 / W55, have the following meaning:External temperature 2 °C and heating water flow temperature 55 °C.

5.8 / 2.7 5.5 / 2.6

at A-7 / W45 1 kW / --- 5.4 / 2.1

at A2 / W35 1 kW / --- 7.5 / 3.3 7.4 / 3.2

at A7 / W35 1 kW / --- 9.3 / 3.9 9.2 / 3.8

at A7 / W45 1 kW / --- 8.8 / 3.2

at A10 / W35 1 kW / --- 9.8 / 4.1 9.7 / 4.03.4 Temperature spread

of cooling water at A35 / W7 K 7.5 5.0

3.5 Cooling capacity / COP at A27 / W7 kW / --- 7.9 / 2.7 7.9 / 2.6at A27 / W18 kW / --- 9.6 / 3.2 9.6 / 3.2at A35 / W7 kW / --- 7.0 / 2.0 6.9 / 2.0at A35 / W18 kW / --- 8.5 / 2.4 8.5 / 2.4

3.6 Device / outdoors power level dB(A) sound 53 / 603.7 Sound pressure level at a distance of 1m (indoors) dB(A) 48.03.8 Heating water flow rate

with an internal pressure differential of 2 m³/h / Pa

2. The heat circulating pump is integrated.

0.8 / 2700 1.6 / 11900

3.9 Free compression of heat circulating pump (heating, max. level) Pa 45000 27000

3.10 Cooling water flow with an internal pressure differential of m³/h / Pa 0.8 / 2700 1.2 / 6500

3.11 Free compression of circulating pump (cooling, max. level) Pa 45000 37000

3.12 Air flow with an external static pressure differential of m³/h / Pa 2500 / 203.13 Refrigerant; total filling weight type / kg R404A / 3.33.14 Lubricant; total filling quantity type / litres Polyolester (POE) / 1.53.15 Output of electric heating element (2nd heat generator) kW 2.0

4 Dimensions, connections and weight4.1 Device dimensions H x W x L cm 190 x 75 x 684.2 Device connections for heating system Inch Thread 1'' external4.3 Air duct inlet and outlet (min. internal dimensions) L x W cm 44 x 444.4 Weight of the transportable unit(s) incl. packaging kg 2504.5 Buffer tank volume / nominal pressure l / bar 50 / 6

5 Electrical Connection5.1 Nominal voltage; fuse protection V / A 230 / 20

5.2 Nominal power consumption 1 A2 W35 kW 2.27 2.335.3 Starting current with soft starter A 305.4 Nominal current A2 W35 / cosϕ A / --- 12.3 / 0.8 12.7 / 0.8

6 Complies with the European safety regulations 3

3. See CE declaration of conformity

7 Additional model features7.1 Defrosting / type of defrosting / defrosting tray included automatic / reverse circulation / yes (heated)

7.2 Heating water in device is protected against freezing 4

4. The heat circulating pump and the heat pump controller must always be ready for operation.

Yes7.3 Perfomance levels / controller: 1 / internal

18

Active Cooling with Air-to-Water Heat Pumps 4.3.2

4.3.2 Reversible air-to-water heat pump - 230V

Device information for air-to-water heat pumps for heating purposes1 Type and order code LI 11MER

2 Design2.1 Model Reversible

2.2 Degree of protection according to EN 60 529 IP 21

2.3 Installation location Indoors

3 Performance data3.1 Operating temperature limits:

Heating water flow / return flow °C / °C up to 58 / above 18

Cooling, flow °C +7 to +20

Air (heating) °C -25 to +35

Air (cooling) °C +15 to +40

3.2 Temperature spread of heating water at A7 / W35 K 9.6 5.0

3.3 Heat output / COP at A-7 / W35 1 kW / ---

1. These data indicate the size and capacity of the system according to EN 255 or EN 14511. For an analysis of the economic and energy efficiency of the system, other parameters,in particular the defrosting capacity, the bivalence point and regulation, should also be taken into consideration. The specified values, e.g. A2 / W55, have the following meaning:2 °C external air temperature and 55 °C heating water flow temperature.

7.5 / 2.8 7.0 / 2.7

at A-7 / W45 1 kW / --- 6.8 / 2.3

at A2 / W35 1 kW / --- 8.9 / 3.4 8.8 / 3.3

at A7 / W35 1 kW / --- 11.1 / 4.2 11.1 / 4.0

at A7 / W45 1 kW / --- 9.4 / 3.5

at A10 / W35 1 kW / --- 12.1 / 4.6 12.0 / 4.4

3.4 Temperature spread of cooling water at A35 / W7 K 6.5 5.0

3.5 Cooling capacity / COP at A27 / W7 kW / --- 8.8 / 2.8 8.8 / 2.8

at A27 / W18 kW / --- 10.9 / 3.3 10.8 / 3.2

at A35 / W7 kW / --- 7.6 / 2.1 9.5 / 2.5

at A35 / W18 kW / --- 9.5 / 2.5 9.5 / 2.5

3.6 Sound power level device / outdoors dB(A) 55 / 61

3.7 Sound pressure level at a distance of 1 m (indoors) dB(A) 50

3.8 Heating water flow with an internal pressure differential of m³/h / Pa 1.0 / 3000 1.9 / 10900

3.9 Cooling water flow rate with an internal pressure differential of m³/h / Pa 1.0 / 3000 1.3 / 5900

3.10 Air flow with an external static pressure differential of m³/h / Pa 4200 / 0

m³/h / Pa 2500 / 25

3.11 Refrigerant; total filling weight type / kg R404A / 3.6

3.12 Lubricant; total filling quantity type / litres Polyolester (POE) / 1.5

4 Dimensions, connections and weight4.1 Device dimensions H x W x L cm 136 x 75 x 88

4.2 Device connections for heating system Inch Thread 1 1/4'' external

4.3 Air duct inlet and outlet (min. internal dimensions) L x W cm 50 x 50

4.4 Weight of the transportable unit(s) incl. packaging kg 205

5 Electrical Connection5.1 Nominal voltage; fuse protection V / A 230 / 25

5.2 Nominal power consumption 1 A2 W35 kW 2.61 2.67

5.3 Starting current with soft starter A 38

5.4 Nominal current A2 W35 / cosϕ A / --- 14.2 / 0.8 14.5 / 0.8

5.5 max. power consumption of compressor protection(per compressor) W 70

6 Complies with the European safety regulations 2

2. See CE declaration of conformity

7 Additional model features7.1 Defrosting / type of defrosting / defrosting tray included automatic / reverse circulation / yes (heated)

7.2 Heating water in device is protected against freezing 3

3. The heat circulating pump and the heat pump controller must always be ready for operation.

Yes

7.3 Performance levels 1

7.4 Controller internal/external Internal

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4.3.3

4.3.3 Reversible Air-to-Water Heat Pumps with Waste Heat Recovery

Device information for air-to-water heat pumps for heating purposes1 Type and order code LI 11TER+ LI 16TER+

2 Design2.1 Model Reversible Reversible2.2 Degree of protection according to EN 60 529 for compact devices and heating components IP 21 IP 21

2.3 Installation location Indoors Indoors

3 Performance data3.1 Operating temperature limits:

Heating water flow / return flow 1 °C / °C

1. See operating limits diagram

up to 58 / above 18 up to 58 / above 18Cooling, flow °C +7 to +20 +7 to +20Air (heating) °C -25 to +35 -25 to +35Air (cooling) °C +15 to +40 +15 to +40

3.2 Temperature spread of heating water at A7 / W35 9.7 5.0 9.3 5.0

3.3 Heat output / COP at A-7 / W35 2 kW / ---

2. This data indicates the size and capacity of the system according to EN 255 and EN 14511. For an analysis of the economic and energy efficiency of the system, other parameters,in particular the defrosting capacity, the bivalence point and regulation should also be taken into consideration. The specified values, e.g. A2 / W55, have the following meaning:2 °C external air temperature and 55 °C heating water flow temperature.

7.1 / 2.9 6.6 / 2.7 10.6 / 3.0 10.5 / 2.9

at A-7 / W45 2 kW / --- 6.4 / 2.3 9.9 / 2.5

at A2 / W35 2 kW / --- 8.8 / 3.2 8.8 / 3.1 12.8 / 3.4 12.7 / 3.2

at A7 / W35 2 kW / --- 11.3 / 3.8 11.3 / 3.6 15.1 / 3.8 14.9 / 3.6

at A7 / W45 2 kW / --- 9.6 / 3.1 14.7 / 3.3

at A10 / W35 2 kW / --- 12.2 / 4.1 12.1 / 3.9 16.7 / 4.1 16.6 / 3.93.4 Temperature spread

of cooling water at A35 / W7 6.5 5.0 6.6 5.0

3.5 Cooling capacity / COP at A27 / W7 kW / --- 8.8 / 2.8 8.8 / 2.8 12.6 / 2.6 12.5 / 2.6at A27 / W18 kW / --- 10.9 / 3.3 10.8 / 3.2 16.4 / 2.8 16.4 / 2.8at A35 / W7 kW / --- 7.6 / 2.1 7.5 / 2.1 10.7 / 2.0 10.6 / 2.0at A35 / W18 kW / --- 9.5 / 2.5 9.5 / 2.5 14.3 / 2.3 14.3 / 2.2

3.6 Sound power level device / outdoors dB(A) 55 / 61 57 / 623.7 Sound pressure level at a distance of 1m (indoors) dB(A) 50 523.8 Heating water flow

with an internal pressure differential of m³/h / Pa 1.0 / 3000 1.9 / 10900 1.4 / 4500 2.6 / 14600

3.9 Cooling water flow with an internal pressure differential of m³/h / Pa 1.0 / 3000 1.3 / 5900 1.4 / 4500 1.8 / 7000

3.10 Air flow with an external static pressure differential of m³/h / Pa 4200 / 0 5200 / 0m³/h / Pa 2500 / 25 4000 / 25

3.11 Refrigerant; total filling weight type / kg R404A / 5.1 R404A / 5.73.12 Lubricant; total filling quantity type / litres Polyolester (POE) / 1.5 Polyolester (POE) / 1.9

4 Dimensions, connections and weight4.1 Device dimensions H x W x L cm 136 x 75 x 88 157 x 75 x 884.2 Device connections to heating system Inch Thread 1 1/4'' external Thread 1 1/4'' external4.3 Device connections to additional heat exchanger

(waste heat recovery) Inch Thread 1 1/4'' external Thread 1 1/4'' external

4.4 Air duct inlet and outlet (min. internal dimensions) L x W cm 50 x 50 57 x 574.5 Weight of the transportable unit(s) incl. packaging kg 222 260

5 Electrical Connection5.1 Nominal voltage; fuse protection V / A 400 / 16 400 / 20

5.2 Nominal power consumption 2 A2 W35 kW 2.74 2.86 3.8 4.05.3 Starting current with soft starter A 23 255.4 Nominal current A2 W35 / cosϕ A / --- 4.9 / 0.8 5.16 / 0.8 6.9 / 0.8 7.2 / 0.85.5 Max. power consumption of compressor protection

(per compressor) W 70 70

6 Complies with the European safety regulations 3

3. See CE declaration of conformity

3

7 Additional model features7.1 Defrosting / type of defrosting / defrosting tray included automatic / reverse circulation / yes (heated)

Automatic7.2 Heating water in device is protected against freezing Yes 4

4. The heat circulating pump and the heat pump controller must always be ready for operation.

Yes 4

7.3 Performance levels / controller internal / external 1 / internal 1 / internal

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Active Cooling with Air-to-Water Heat Pumps 4.4.1

4.4 Device Information for Air-to-Water Heat Pumps for Outdoor Installation

4.4.1 Reversible air-to-water heat pumps - 230V

Device information for air-to-water heat pumps for heating purposes1 Type and order code LA 11MSR

2 Design2.1 Model Reversible2.2 Degree of protection according to EN 60 529 IP 242.3 Installation location Outdoors3 Performance data3.1 Operating temperature limits:

Heating water flow / return flow 1 °C / °C

1. See operating limits diagram

up to 55 / above 18Cooling, flow °C +7 to +20Air (heating) °C -25 to +35Air (cooling) °C +15 to +40

3.2 Temperature spread of heating water at A7 / W35 9.6 5.0

3.3 Heat output / COP at A-7 / W35 2 kW / ---

2. This data indicates the size and capacity of the system according to EN 255 or EN 14511. For an analysis of the economic and energy efficiency of the system, other parameters,in particular the defrosting capacity, the bivalence point and regulation should also be taken into consideration. The specified values have the following meaning e.g. A2 / W35:2 °C external air temperature and 35°C heating water flow temperature.

7.5 / 2.8 7.0 / 2.7

at A-7 / W45 1 kW / --- 6.8 / 2.3

at A2 / W35 2 kW / --- 8.9 / 3.4 8.8 / 3.3

at A2 / W50 2 kW / --- 8.8 / 2.5

at A7 / W35 2 kW / --- 11.1 / 4.2 11.1 / 4.0

at A7 / W45 1 kW / --- 9.4 / 3.5

at A10 / W35 2 kW / --- 12.1 / 4.6 12.0 / 4.43.4 Temperature spread

of cooling water at A35 / W7 6.5 5.0

3.5 Cooling capacity / COP at A27 / W7 kW / --- 8.8 / 2.8 8.8 / 2.8at A27 / W18 kW / --- 10.9 / 3.3 10.8 / 3.2at A35 / W7 kW / --- 7.6 / 2.1 7.5 / 2.1at A35 / W18 kW / --- 9.5 / 2.5 9.5 / 2.5

3.6 Sound power level dB(A) 633.7 Sound pressure level at a distance of 10 m

(air outlet side) dB(A) 33

3.8 Heating water flow with an internal pressure differential of m³/h / Pa 1.0 / 3000 1.9 / 10900

3.9 Cooling water flow with an internal pressure differential of m³/h / Pa 1.0 / 3000 1.3 / 5900

3.10 Air flow with an external static pressure differential of m³/h / Pa 25003.11 Refrigerant; total filling weight type / kg R404A / 3.63.12 Lubricant; total filling quantity type / litres Polyolester (POE) / 1.54 Dimensions, connections and weight4.1 Device dimensions H x W x L cm 136 x 136 x 854.2 Device connections for heating system Inch Thread 1'' external4.3 Weight of the transportable unit(s) incl. packaging kg 2245 Electrical Connection5.1 Nominal voltage; fuse protection V / A 230 / 25

5.2 Nominal power consumption 2 A2 W35 kW 2.61 2.675.3 Starting current with soft starter A 385.4 Nominal current A2 W35 / cosϕ A / --- 14.2 / 0.8 14.5 / 0.85.5 max. power consumption of compressor protection

(per compressor) W 70

6 Complies with the European safety regulations 3

3. See CE declaration of conformity

7 Additional model features7.1 Defrosting Automatic

Type of defrosting Reverse circulationDefrosting tray included Yes (heated)

7.2 Heating water in device is protected against freezing Yes 4

4. The heat circulating pump and the heat pump controller must always be ready for operation.

7.3 Performance levels 17.4 Controller internal/external External

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4.4.2

4.4.2 Reversible Air-to-Water Heat Pumps with Waste Heat Recovery

Device information for air-to-water heat pumps for heating purposes1 Type and order code LA 11ASR LA 16ASR

2 Design2.1 Model Reversible Reversible2.2 Degree of protection according to EN 60 529 for compact devices and

heating components IP 24 IP 24

2.3 Installation location Outdoors Outdoors

3 Performance data3.1 Operating temperature limits:

Heating water flow / return flow 1 °C / °C

1. See operating limits diagram

up to 55 / above 18 up to 55 / above 18Cooling, flow °C +7 to +20 +7 to +20Air (heating) °C -25 to +35 -25 to +35Air (cooling) °C +15 to +40 +15 to +40

3.2 Temperature spread of heating water at A2 / W35 7.5 7.9

3.3 Heat output / COP 2 at A-7 / W35 kW / ---

2. This data indicates the size and capacity of the system according to EN 255 and EN 14511. For an analysis of the economic and energy efficiency of the system, other parameters,in particular the defrosting capacity, the bivalence point and regulation should also be taken into consideration. The specified values, e.g. A2 / W55, have the following meaning:2 °C external air temperature and 55 °C heating water flow temperature.

7.1 / 2.9 10.6 / 3.0at A2 / W35 kW / --- 8.8 / 3.2 12.8 / 3.4at A2 / W50 kW / --- 8.5 / 2.5 12.0 / 2.5at A7 / W35 kW / --- 11.3 / 3.8 15.1 / 3.8at A10 / W35 kW / --- 12.2 / 4.1 16.7 / 4.1

3.4 Cooling capacity / COP at A27 / W8 kW / --- 9.0 / 2.9 13.0 / 2.6at A27 / W18 kW / --- 10.9 / 3.3 16.4 / 2.8at A35 / W8 kW / --- 7.8 / 2.2 11.1 / 2.1at A35 / W18 kW / --- 9.5 / 2.5 14.3 / 2.3

3.5 Sound power level dB(A) 63 643.6 Sound pressure level at a distance of 10 m

(air outlet side) dB(A) 33 34

3.7 Heating water flow with an internal pressure differential of m³/h / Pa 1.0 / 3000 1.4 / 4500

3.8 Air flow m³/h / Pa 2500 40003.9 Refrigerant; total filling weight type / kg R404A / 4.7 R404A / 5.73.10 Lubricant; total filling quantity type / litres Polyolester (POE) / 1.5 Polyolester (POE) / 1.9

4 Dimensions, connections and weight4.1 Device dimensions H x W x L cm 136 x 136 x 85 157 x 155 x 854.2 Device connections for heating system Inch Thread 1'' external Thread 1'' external4.3 Device connections for additional heat exchanger

(waste heat recovery) Inch Thread 1'' external Thread 1'' external

4.4 Weight of the transportable unit(s) incl. packaging kg 241 289

5 Electrical Connection5.1 Nominal voltage; fuse protection V / A 400 / 16 400 / 20

5.2 Nominal power consumption 2 A2 W35 kW 2.74 3.85.3 Starting current with soft starter A 23 255.4 Nominal current A2 W35 / cosϕ A / --- 4.9 / 0.8 6.9 / 0.85.5 max. power consumption of compressor protection

(per compressor) W 70 70

6 Complies with the European safety regulations 3

3. See CE declaration of conformity

3

7 Additional model features7.1 Defrosting / type of defrosting / defrosting tray included automatic / reverse circulation / yes (heated)7.2 Heating water in device is protected against freezing Yes 4

4. The heat circulating pump and the heat pump controller must always be ready for operation.

Yes 4

7.3 Performance levels 1 17.4 Controller internal/external External External

22

Active Cooling with Air-to-Water Heat Pumps 4.5.1

4.5 Characteristic Curves of Reversible Air-to-Water Heat Pumps

4.5.1 Characteristic Curves LIK 8MER (Heating Operation)

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4.5.2

4.5.2 Characteristic curves LI 11MER / LA 11MSR (Heating operation)

24

Active Cooling with Air-to-Water Heat Pumps 4.5.3

4.5.3 Characteristic Curves LI 11TER+ / LA 11ASR (Heating Operation)

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4.5.4

4.5.4 Characteristic curves LI 16TER+ / LA 16ASR (Heating operation)

26

Active Cooling with Air-to-Water Heat Pumps 4.5.5

4.5.5 Characteristic Curves LIK 8MER (Cooling Operation)

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4.5.6

4.5.6 Characteristic curves LI 11MER / LA 11MSR (Cooling operation)

28

Active Cooling with Air-to-Water Heat Pumps 4.5.7

4.5.7 Characteristic Curves LI 11TER+ / LA 11ASR (Cooling Operation)

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4.5.8

4.5.8 Characteristic Curves LI 16TER+ / LA 16ASR (Cooling Operation)

30

Active Cooling with Air-to-Water Heat Pumps 4.6.1

4.6 Dimensions of Reversible Air-to-Water Heat Pumps

4.6.1 Dimensions LIK 8MER

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4.6.2

4.6.2 Dimensions LI 11MER

32

Active Cooling with Air-to-Water Heat Pumps 4.6.3

4.6.3 Dimensions LI 11TER+

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4.6.4

4.6.4 Dimensions LI 16TER+

34

Active Cooling with Air-to-Water Heat Pumps 4.6.5

4.6.5 Dimensions LA 11MSR

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4.6.6

4.6.6 Dimensions LA 11ASR

36

Active Cooling with Air-to-Water Heat Pumps 4.6.7

4.6.7 Dimensions LA 16ASR

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5

5 Active Cooling with Brine-to-Water Heat Pumps

5.1 Designing Borehole Heat Exchangers for Heating and CoolingBorehole heat exchangers for reversible heat pumps - both forheating and cooling purposes - must be designed by ageothermal planning professional. Parameters which must beconsidered in such cases include:

Consistency of the subsoilNumber of hours at full load and minimum permissible brinetemperature in heating operation

Number of hours at full load and maximum permissible brinetemperature in cooling operation

NOTEThe requirements for using the ground as a heat source in heatingoperation can be found in the Dimplex product planning and installationmanual.

Table 5.1: Refrigerating capacity in heating operation and waste heat to be discharged in cooling operation

5.1.1 Dimensioning information - heat transfer into the ground

NOTEIn cooling operation, unlike heating operation, the power consumption ofthe compressor cannot be used; instead, this is discharged separatelyinto the ground as waste heat.

The output power in the design (e.g. brine temperature 20 °C,cooling water outlet temperature 12 °C) can be calculated in the

design from the cooling capacity plus the electrical powerconsumption of the heat pump.

5.1.2 Dimensioning of the brine circulating pumpThe brine volume flow rate depends on the output of the heatpump, and is conveyed by the brine circulating pump. The brineflow specified in the Device Information provides a heat sourcetemperature spread of 3 K in heating operation. In addition to thevolume flow rate, the pressure-drops in the brine circuit systemand the pump manufacturers' technical data must be taken into

consideration. Pressure-drops in pipes connected in series,installed components and the heat exchangers should be added.

NOTEThe pressure-drop of an antifreeze/water mixture (25 %) is 1.5 to 1.7 timeshigher than that of pure water, whereas the capacity of many circulatingpumps drops by approx. 10 %.

5.1.3 Brine fluid

Brine concentrationAntifreeze should be added to the water on the heat source sideto prevent frost damage to the evaporator of the heat pump.Frost protection from -14 °C to -18 °C is required for brine-to-water heat pumps with a minimum brine inlet temperature of -5 °C due to the temperatures which occur in the refrigeratingcycle.

NOTEIn order to prevent partial freezing of the liquefier, the frost protectionmust be at least 9 Kelvin below the minimum permissible brine inlettemperature.

A monoethyleneglycol-based antifreeze is used. The brineconcentration for installation underground ranges from 25 % to amaximum of 30 %.

ATTENTION!The use of a brine-to-water heat pump with pure water (without antifreeze)is not permissible, as the safety units of the heat pump cannot preventdestruction of the compressor or of the heat exchanger.

Heat pump MinimumBrine flow

Refrigerating capacity to be absorbed

in heating operation at B0/W35

Waste heat to be discharged in cooling operation at B20/W18

m3/h kW kWSI 5MER 1.2 3.7 7.8SI 7MER 1.7 4.8 10.2SI 9MER 2.3 7.0 14.2SI 11MER 3.0 8.8 16.9

Heat pump MinimumBrine flow

Refrigerating capacity to be absorbed

in heating operation at B0/W35

Waste heat to be discharged in cooling operation at B20/W18

m3/h kW kWSI 30TER+ 6.7 21.1 52.0SI 75TER+ 14.0 45.2 105.3

Cooling capacity of the heat pump+ Electrical power consumption of the heat pump= Waste heat to be discharged into the ground

38

Active Cooling with Brine-to-Water Heat Pumps 5.2.1

5.2 Device information

5.2.1 Reversible Air-to-Water Heat Pumps - 230V Single-Phase

Device information for brine-to-water heat pumps for heating purposes1 Type and order code SI 5MER SI 7MER SI 9MER SI 11MER

2 Design2.1 Model Reversible Reversible Reversible Reversible2.2 Degree of protection according to EN 60 529 IP 20 IP 20 IP 20 IP 202.3 Installation location Indoors Indoors Indoors Indoors

3 Performance data3.1 Operating temperature limits:

Heating water flow °C Up to 58 Up to 58 Up to 58 Up to 58Cooling, flow °C +7 to +20 +7 to +20 +7 to +20 +7 to +20Brine (heat source, heating) °C -5 to +25 -5 to +25 -5 to +25 -5 to +25Brine (heat sink, cooling) °C +5 to +25 +5 to +25 +5 to +25 +5 to +25

Antifreeze Monoethylene glycol

Monoethylene glycol

Monoethylene glycol

Monoethylene glycol

Minimum brine concentration (-13 °C freezing temperature) 25% 25% 25% 25%3.2 Temperature spread

of heating water at B0 / W35 K 9.4 5 9.1 5 10.6 5 9.9 5

3.3 Heat output / COP at B-5 / W55 1 kW / ---

1. This data indicates the size and capacity of the system according to EN 255 and EN 14511. For an analysis of the economic and energy efficiency of the system, the bivalencepoint and regulation should be taken into consideration. The specified values, e.g. B10 / W55, have the following meaning: Heat source temperature 10 °C and heating water flowtemperature 55 °C.

4.2 / 2.0 5.4 / 2.1 7.5 / 2.0 9.8 / 2.1

at B0 / W45 1 kW / --- 4.7 / 2.9 6.0 / 2.9 8.6 / 2.8 10.8 / 3.0

at B0 / W50 1 kW / --- 4.8 / 2.7 6.2 / 2.7 8.8 / 2.8 11.3/2.9

at B0 / W35 1 kW / --- 4.9 / 4.0 4.8 / 3.9 6.4 / 4.0 6.3 / 3.9 9.3 / 4.0 9.1 / 3.9 11.6 / 4.1

11.4 / 4.0

3.4 Cooling capacity / COP at B20 / W8 kW / --- 5.4 / 4.6 5.3 / 4.6 7.0 / 4.5 6.9 / 4.4 9.9 / 4.6 9.8 / 4.5 11.4 / 4.6

11.3 / 4.4

at B20 / W18 kW / --- 6.6 / 5.3 6.4 / 5.3 8.6 / 5.3 8.4 / 5.2 12.0 / 5.4

11.9 / 5.2

14.1 / 5.3

13.9 / 5.2

at B10 / W8 kW / --- 5.4 / 5.6 5.3 / 5.6 7.0 / 5.5 6.9 / 5.4 9.9 / 5.6 9.8 / 5.4 11.6 / 5.7

11.4 / 5.5

at B10 / W18 kW / --- 6.8 / 6.7 6.6 / 6.2 8.8 / 6.6 8.6 / 6.4 12.4 / 6.7

12.2 / 6.6

14.1 / 6.5

13.8 / 6.3

3.5 Sound power level dB(A) 54 55 56 563.6 Heating water flow with an internal

pressure differential of m³/h / Pa0.45 / 1900

0.85 / 6500

0.6 / 3300

1.1 / 10800

0.75 / 2300

1.55 / 9700

1.0 / 4100

2.0 / 16000

3.7 Brine flow with an internal pressure differential (heat source) of m³/h / Pa

1.2 / 16000

1.2 / 16000

1.7 / 29500

1.4 / 22100

2.3 / 25000

1.8 / 17000

3.0 / 24000

2.5 / 17000

3.8 Refrigerant; total filling weight type / kg R407C / 1.3 R407C / 1.6 R407C / 1.6 R407C / 2.0

3.9 Lubricant; total filling quantity type / litres Polyolester(POE) / 1.0

Polyolester(POE) / 1.0

Polyolester(POE) / 1.1

Polyolester(POE) / 1.36

4 Dimensions, connections and weight4.1 Device dimensions without connections 2 H x W x L mm

2. Note that additional space is required for pipe connections, operation and maintenance.

800 × 600 × 450 800 × 600 × 450 800 × 600 × 450 800 × 600 × 450

4.2 Device connections to heating system Inch Thread 1¼" external

Thread 1¼" external

Thread 1¼" external

Thread 1¼" external

4.3 Device connections to heat source Inch Thread 1¼" external

Thread 1¼" external

Thread 1¼" external

Thread 1¼" external

4.4 Weight of the transportable unit(s) incl. packaging kg 115 117 124 128

5 Electrical Connection5.1 Nominal voltage; fuse protection V / A 230 / 16 230 / 16 230 / 20 230 / 25

5.2 Nominal power consumption 1 B0 W35 kW 1.22 1.23 1.60 1.62 2.32 2.33 2.83 2.85

5.3 Starting current with soft starter A 24 26 38 38

5.4 Nominal current B0 W35 / cos ϕ A / --- 6.8 / 0.8 6.9 / 0.8 9.1 / 0.8 9.2 / 0.8 12.5 / 0.8

12.6 / 0.8

15.2 / 0.8

15.3 / 0.8

6 Complies with the European safety regulations 3

3. See CE declaration of conformity

3 3 3

7 Additional model features7.1 Water in device protected against freezing 4

4. The heat circulating pump and the heat pump controller must always be ready for operation.

No No No No

7.2 Performance levels 1 1 1 17.3 Controller internal/external Internal Internal Internal Internal

www.dimplex.de 39

5.2.2

5.2.2 Reversible Brine-to-Water Heat Pump

Device information for brine-to-water heat pumps for heating purposes1 Type and order code SI 75ZSR

2 Design2.1 Model Reversible2.2 Degree of protection according to EN 60 529 IP 212.3 Installation location Indoors

3 Performance data3.1 Operating temperature limits:

Heating water flow °C Up to 55Cooling, flow °C +7 to +20Brine (heat source, heating) °C -5 to +25Brine (heat sink, cooling) °C +5 to +30Antifreeze Monoethylene glycol Minimum brine concentration (-13 °C freezing temperature) 25%

3.2 Temperature spread of heating water at B0 / W35 K 5

3.3 Heat output / COP at B-5 / W55 1 kW / --- 2

1. This data indicates the size and capacity of the system according to EN 14511. For an analysis of the economic and energy efficiency of the system, the bivalence point andregulation should be taken into consideration. The specified values, e.g. B10 / W55, have the following meaning: Heat source temperature 10 °C and heating water flow temperature55 °C.

2. Operation with 2 compressors

54.9 / 2.0

kW / --- 3

3. Operation with 1 compressor

27.3 / 2.1

at B0 / W50 1 kW / --- 2 62.3 / 2.5

kW / --- 3 31.3 / 2.5

at B0 / W35 1 kW / --- 2 65.3 / 3.5

kW / --- 3 35.1 / 3.8

3.4 Cooling capacity / COP at B20 / W8 kW / --- 2 82.1 / 5.0

kW / --- 3 44.9 / 6.4

at B20 / W18 kW / --- 2 100.0 / 5.6

kW / --- 3 55.0 / 7.4

at B10 / W8 kW / --- 2 86.6 / 6.1

kW / --- 3 47.4 / 7.7

at B10 / W18 kW / --- 2 98.2 / 6.3

kW / --- 3 53.2 / 8.2

3.5 Sound power level dB(A) 693.6 Sound pressure level at a distance of 1 m dB(A) 543.7 Heating water flow with an internal pressure

differential of m³/h / Pa 11.5 / 7300

3.8 Brine flow with an internal pressure differential (heat source) of m³/h / Pa 20.5 / 17800

3.9 Refrigerant; total filling weight type / kg R404A / 16.13.10 Lubricant; total filling quantity type / litres 160 SZ / 6.5

4 Dimensions, connections and weight4.1 Device dimensions without connections 4 H x W x L mm

4. Note that additional space is required for pipe connections, operation and maintenance.

1890 × 1350 × 750

4.2 Device connections for heating system Inch Thread 2" internal/external4.3 Device connections to heat source Inch Thread 2 1/2" internal/external4.4 Weight of the transportable unit(s) incl. packaging kg 607

5 Electrical Connection5.1 Nominal voltage; fuse protection V / A 400 / 63

5.2 Nominal power consumption 1 B0 W35 kW 18.86

5.3 Starting current with soft starter A 105

5.4 Nominal current B0 W35 / cosϕ 2 A / --- 34.03 / 0.8

6 Complies with the European safety regulations 5

5. See CE declaration of conformity

7 Additional model features7.1 Water in device protected against freezing 6

6. The heat circulating pump and the heat pump controller must always be ready for operation.

Yes

7.2 Perfomance levels / controller: 2 / internal

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Active Cooling with Brine-to-Water Heat Pumps 5.2.3

5.2.3 Reversible brine-to-water heat pumps with waste heat recovery

Device information for brine-to-water heat pumps for heating purposes1 Type and order code SI 30TER+ SI 75TER+

2 Design2.1 Model Reversible with

additional heat exchangerReversible with

additional heat exchanger2.2 Degree of protection according to EN 60 529 IP 21 IP 212.3 Installation location Indoors Indoors3 Performance data3.1 Operating temperature limits: 1

1. See output curves

Heating water flow °C up to 55±1 up to 55±1Cooling, flow °C +7 to +20 +7 to +20Brine (heat source, heating) °C -5 to +25 -5 to +25Brine (heat sink, cooling) °C +5 to +30 +5 to +30Antifreeze Monoethylene glycol Monoethylene glycol Minimum brine concentration (-13 °C freezing temperature) 25% 25%

3.2 Temperature spread of heating water at B0 / W35 K 5 5

3.3 Heat output / COP2 at B-5 / W55 3 kW / --- 4

2. The coefficients of performance for parallel hot water preparation are also achieved via additional heat exchangers.3. This data indicates the size and capacity of the system according to EN14511. For an analysis of the economic and energy efficiency of the system, both the bivalence point and

the regulation should be taken into consideration. The specified values, e.g. B0 / W55, have the following meaning: Heat source temperature 0 °C and heating water flowtemperature 55 °C.

4. Operation with 2 compressors

22.0 / 2.0 53.5 / 1.9

kW / --- 5

5. Operation with 1 compressor

11.1 / 2.1 28.0 / 2.0

at B0 / W55 3 kW / --- 4 24.9 / 2.2 59.5 / 2.1

kW / --- 5 12.8 / 2.3 30.0 / 2.2

at B0 / W35 3 kW / --- 4 28.6 / 3.8 64.0 / 3.4 6

6. With B0 / W35 according to EN255: Heat output 66.4 kW; coefficient of performance 3.6

kW / --- 5 15.2 / 4.2 34.0 / 3.7

3.4 Cooling capacity / COP7 at B20 / W103 kW / --- 4

7. Considerably higher coefficients of performance are achieved by means of cooling operation and waste heat recovery using additional heat exchangers.

35.3 / 5.3 75.5 / 4.5

at B20 / W73 kW / --- 5 18.2 / 6.1 46.0 / 6.4

at B20 / W183 kW / --- 4 44.6 / 6.2 86.5 / 5.1

kW / --- 5 23.6 / 7.5 52.9 / 6.5

at B10 / W73 kW / --- 5 21.0 / 8.6 48.5 / 7.9

at B10 / W183 kW / --- 4 46.7 / 7.4 91.3 / 6.6

kW / --- 5 25.4 / 9.5 57.1 / 8.63.5 Sound power level dB(A) 62 693.6 Sound pressure level at a distance of 1 m dB(A) 46 543.7 Heating water flow with an internal

pressure differential of m³/h / Pa 4.7 / 2200 11.0 / 6000

3.8 Brine flow with an internal pressure differential (heat source) of m³/h / Pa 6.7 / 5300 14.0 / 9000

3.9 Flow rate of additional heat exchangerwith an internal pressure differential of m³/h / Pa 4.0 / 20000 6.0 / 7000

3.10 Refrigerant; total filling weight type / kg R404A / 8.1 R404A / 16.03.11 Lubricant; total filling quantity type / litres Polyolester (POE) / 3.7 Polyolester (POE) / 6.74 Dimensions, connections and weight4.1 Device dimensions without connections H x W x L mm 1660 x 1000 x 775 1890 × 1350 × 7504.2 Device connections for heating system Inch Thread 1 1/2" internal/external Thread 2" internal/external4.3 Device connections to heat source Inch Thread 2" internal/external Thread 2 1/2" internal/external4.4 Device connections for domestic hot water Inch Thread 1" internal/external Thread 1 1/4" internal/external4.5 Weight of the transportable unit(s) incl. packaging kg 385 6585 Electrical Connection5.1 Nominal voltage; fuse protection V / A 400 / 20 400 / 63

5.2 Nominal power consumption 3 4 B0 W35 kW 7.53 18.825.3 Starting current with soft starter A 26 105

5.4 Nominal current B0 W35 / cosϕ 4 A / --- 13.59 / 0.8 33.96 / 0.85.5 max. power consumption of compressor protection (per compressor) W 70 65

6 Complies with the European safety regulations CE conformity CE conformity

7 Additional model features7.1 Water in device is protected against freezing 8

8. The heat circulating pump and the heat pump controller must always be ready for operation.

Yes Yes

7.2 Perfomance levels / controller: 2 / internal 2 / internal

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5.3

5.3 Characteristic Curves of Reversible Brine-to-Water Heat Pumps

5.3.1 Characteristic Curves SI 5MER (Heating Operation)

42

Active Cooling with Brine-to-Water Heat Pumps 5.3.2

5.3.2 Characteristic curves SI 7MER (Heating operation)

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5.3.3

5.3.3 Characteristic curves SI 9MER (Heating operation)

44

Active Cooling with Brine-to-Water Heat Pumps 5.3.4

5.3.4 Characteristic curves SI 11MER (Heating operation)

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5.3.5

5.3.5 Characteristic Curves SI 75ZSR (Heating Operation)

46

Active Cooling with Brine-to-Water Heat Pumps 5.3.6

5.3.6 Characteristic curves SI 30TER+ (Heating operation)

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5.3.7

5.3.7 Characteristic curves SI 75TER+ (Heating operation)

48

Active Cooling with Brine-to-Water Heat Pumps 5.3.8

5.3.8 Characteristic Curves SI 5MER (Cooling Operation)

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5.3.9

5.3.9 Characteristic curves SI 7MER (Cooling operation)

50

Active Cooling with Brine-to-Water Heat Pumps 5.3.10

5.3.10 Characteristic curves SI 9MER (Cooling operation)

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5.3.11

5.3.11 Characteristic curves SI 11MER (Cooling operation)

52

Active Cooling with Brine-to-Water Heat Pumps 5.3.12

5.3.12 Characteristic Curves SI 75ZSR (Cooling Operation)

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5.3.13

5.3.13 Characteristic curves SI 30TER+ (Cooling operation)

54

Active Cooling with Brine-to-Water Heat Pumps 5.3.14

5.3.14 Characteristic curves SI 75TER+ (Cooling operation)

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5.4

5.4 Dimensions of Reversible Brine-to-Water Heat Pumps

5.4.1 Dimensions SI 5MER - SI 11MER

56

Active Cooling with Brine-to-Water Heat Pumps 5.4.2

5.4.2 Dimensions SI 75ZSR

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5.4.3

5.4.3 Dimensions SI 30TER+

58

Active Cooling with Brine-to-Water Heat Pumps 5.4.4

5.4.4 Dimensions SI 75TER+

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6

6 Passive Cooling using a Heat Exchanger

6.1 Passive Cooling with Water-to-Water Heat PumpsThe WPMPK passive cooling controller adds cooling operationto the existing heat pump manager of a Dimplex water-to-waterheat pump. The cooling capacity is transferred via a heatexchanger, which is not included in the scope of supply. This

heat exchanger must be configured according to the coolingcapacity to be transferred, the volume flow and the water quality.

Table 6.1: Transferable cooling capacity with a water inlet temperature of approx. 10 °C and a cooling water inlet temperature of 20 °C!

6.2 Passive Cooling with Brine-to-Water Heat PumpsThe passive cooling stations PKS 14 and PKS 25 consist of aheat exchanger, brine circulating pump, temperature sensors,passive cooling controller, and enclosed 3-way distribution valve.The integrated passive cooling controller is operated in thenetwork with the existing heat pump manager of a Dimplexbrine-to-water heat pump and it also provides the required connectionoptions and control functions for cooling.

NOTEIf cooling capacities of over 25 kW are required, the passive coolingcontroller from Chapt. 6.1 on pp. 60 can also be used for brine-to-waterheat pumps.

Order reference

Volume flow primary m3/h

Volume flowsecondary m3/h

Cooling capacity kW

Heat source connections

(inch)

Width x Depth x Height

Weightkg

WT 733 3.5 2.0 20 1 1/4 180 x 774 x 325 50

WT 1634 9.5 5.0 50 2 320 x 832 x 375 150

WT 1686 20 8.0 90 2 320 x 832 x 590 190

WT 16112 37 11.5 130 2 320 x 832 x 840 240

60

Passive Cooling using a Heat Exchanger 6.3.1

6.3 Device information

6.3.1 Passive cooling station

Device Information for Passive Cooling Station for Brine-to-Water Heat Pumps

1 Type and order code PKS 14 PKS 252 Design2.1 Degree of protection according to EN 60 529 IP 20 IP 20

2.2 Installation location Indoors Indoors

3 Performance data3.1 Operating temperature limits:

Cooling water °C +5 to +40 +5 to +40

Brine (heat sink) °C +2 to +15 +2 to +15

Antifreeze Monoethylene glycol Monoethylene glycol

Minimum brine concentration (-13 °C freezing temperature) 25% 25%

3.2 Temperature spread of cooling water at B10 / WE20 K 8.2 7.0

Cooling capacity at B5 / WE20 1 kW

1. This data indicates the size and capacity of the system. The specified values, e.g. B5 / W55, have the following meaning: Heat sink temperature of 5 °C and cooling water returnflow temperature (water inlet) 20 °C.

19.3 34.8

at B10 / WE20 1 kW 13 23.7

at B15 / WE20 1 kW 6.5 7.8

3.3 Cooling water flow with an internal pressure differential of m³/h / Pa 1.3 / 8000 2.9 / 17000

3.4 Brine flow with an internal pressure differential (heat sink) of m³/h / Pa 2.5 / 29800 3.6 / 29000

3.5 Free compression (pump level 3) Pa 28000 17000

4 Dimensions, connections and weight4.1 Device dimensions without connections 2 H x W x L mm

2. Note that additional space is required for pipe connections, operation and maintenance.

320 x 650 x 400 320 x 650 x 400

4.2 Device connections for heating system Inch Thread 1¼" external Thread 1¼" external

4.3 Device connections for heat source Inch Thread 1¼" external Thread 1¼" external

4.4 Weight of the transportable unit(s) incl. packaging kg 30 32

5 Electrical Connection5.1 Nominal voltage V 230 230

5.2 Nominal power consumption (pump level 3) W 200 200

6 Complies with the European safety regulations 3

3. See CE declaration of conformity

3

7 Additional model features7.1 Performance levels of pump 3 3

7.2 Controller internal/external Internal Internal

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6.4.1

6.4 Characteristic curves

6.4.1 Characteristic Curves PKS 14

62

Passive Cooling using a Heat Exchanger 6.4.2

6.4.2 Characteristic Curves PKS 25

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6.5

6.5 Dimensions

6.5.1 Dimensions PKS 14 / PKS 25

64

Control and Regulation 7.2

7 Control and RegulationThe system supports two modes for generating the refrigerating capacity:

Active cooling with a reversible heat pump Passive cooling using a heat exchanger

In order to perform cooling functions, a cooling controller isrequired in addition to the heat pump controller (heating).

Reversible heat pumps for active cooling are supplied asstandard with a heat pump manager (heating/cooling). For passive cooling, the cooling controller is connected tothe existing heat pump manager (heating).

ATTENTION!The cooling controller of the reversible brine-to-water heat pumpsSI 30TER+ and SI 75TER+ has been replaced by two additional modules(Fig. 10.10 on pp. 90). For these two heat pumps, the control functionsdescribed in this chapter deviate partially from the K_H_5xab coolingsoftware.

Fig. 7.1: Dimensions of the wall-mounted heat pump manager forheating/cooling

7.1 Network Operation of Heating and Cooling Controllers and Remote Control

Both of the controllers (heating and cooling controllers) areconnected to the J11 plugs via a three-core connecting cable andare operated as a network. This is done by assigning eachcontroller a network address. The network addresses of theheating and cooling controllers are preassigned.

Heating controller Network address 01Cooling controller Network address 02

These controller addresses are factory default settings.Exception: Heating controller for passive cooling station (seePCS installation instructions).The heating and cooling controller software must be compatiblein order for the network to work properly.

Heating software WPM_H_ X Y ZCooling software WPM_K_ X Y Z

The software is compatible if the characters X and Y areidentical, e.g.

WPM_ K_H41 is compatible with WPM_H_H45WPM_ K_H41 is not compatible with WPM_H_H31

Use the “Operating data network”menu to check if the coolingcontroller was identified.The “Network heating/cooling”menu point displays whether thenetwork connection is active.The DIP switches of a connected remote control must be set asfollows:

Fig. 7.2: DIP switch setting

7.2 Temperature Sensor (Cooling Controller)All temperature sensors to be connected to the supplementarycooling controllers have the illustrated sensor characteristiccurve.

Room temperature sensor for room climate control stationFlow sensor for passive coolingReturn flow sensor for passive cooling

Fig. 7.3: NTC sensor for cooling controller

Remote control

No network

Network

123456

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7.3

7.3 Cold Generation by Active Cooling

7.3.1 Heat Pumps without Additional Heat ExchangersCold is generated actively by reversing the process in the heatpump. The refrigerating cycle is switched from heating to coolingoperation using a four-way reversing valve.

NOTEThe heat pump is blocked for 10 minutes when it is switched from heatingto cooling operation. This allows the different pressures in therefrigerating cycle to equalize.

Requests are processed as follows:Domestic hot water beforeCooling first Swimming pool

The heat pump operates as in heating operation during DHW orswimming pool water preparation.

7.3.2 Heat Pumps with Additional Heat Exchangers for Waste Heat RecoveryAn additional heat exchanger in the hot gas of the refrigerantcircuit (immediately after the compressor) can use the wasteheat generated during cooling for DHW or swimming pool waterpreparation. The additional heat exchanger menu item must beset to “YES” to do this.Requests are processed as follows:

Cooling first Domestic hot water beforeSwimming pool

Adjust the maximum temperature “Parallel operation heat –domestic hot water” in the menu item “Settings – domestic hot

water”. As long as the hot water temperature remains below thislimit, the hot water circulating pump runs during coolingoperation. Once the maximum set temperature has beenreached, the hot water pump is switched off and the swimmingpool pump is switched on (independent of the swimming poolthermostat input). If cooling has not been requested, requests for domestic hotwater or the heating requirements of the swimming pool can beprocessed. However, if cooling has been requested, thesefunctions are each cancelled after a maximum continuousruntime of 60 minutes and priority is given to the cooling request.

7.4 Cold Generation via Passive Cooling In the summer, the ground and the ground water are significantlycolder at greater depths than the ambient temperature. A plateheat exchanger installed in the ground water or brine circuittransfers the refrigerating capacity to the heating and coolingcircuit. The heat pump compressor is not active and is thereforeavailable for DHW preparation.Activate parallel operation of cooling and DHW preparation in themenu item “Settings - Domestic hot water - Parallel cool-DHW“.

NOTEEnsure that the special hydraulic installation requirements are fulfilled forthe parallel operation of cooling and domestic hot water preparation.

Passive Cooling with Borehole Heat Exchangers(Bridge A6/ID7 removed)If cooling is required, an additional primary cooling pump (M12)is connected to output NO6. The output of the primary pump M11is only active in heating operation.

Passive Cooling with Ground Water(Bridge A6/ID7 fitted)If there is a request for cooling, the primary pump M11 isactivated, i.e. the same primary pump is used in both heating andcooling operation (e.g. well pump with water-to-water heatpumps).

66

Control and Regulation 7.5.3

7.5 Cooling Program Description

7.5.1 Cooling Operating ModeThe cooling functions are manually activated as operating mode6. There is no automatic switching between heating and coolingoperation. External switching is possible via the input ID12.The “Cooling” operating mode can only be activated if thecooling function (active or passive) has been enabled in thepreconfiguration.

Switching off cold generationThe following functions are provided as safeguards:

The flow temperature falls below a value of 7 °CActivation of the dew point monitor at vulnerable points inthe cooling systemThe dew point is reached with silent-only cooling

7.5.2 Activation of Cooling FunctionsSpecial regulatory functions are performed when coolingoperation is activated. The cooling controller assumes thesecooling functions independently of the remaining regulatoryfunctions.The following can prevent the cooling functions being activated:

The external temperature for reversible air-to-water heatpumps is below 15 °C

The external temperature lies below the settable coolinglimit temperature (recommended minimum value is 3 °C dueto danger of frost) There is no cooling controller fitted or the connection isbrokenNeither silent nor dynamic cooling was selected with “Yes” inthe settings

In these cases, the cooling mode remains active and theregulation system responds as in the summer mode.

7.5.3 Deactivation of Circulating Pumps in Cooling OperationIn the case of a heat pump heating system with two heatingcircuits, the heat circulating pump of heating circuits 1 or 2 canbe deactivated in cooling operation.The heat circulating pump of heating circuit 1 (M14) is not activein cooling operation if silent-only cooling is configured.The heat circulating pump of heating circuit 2 (M15) is not activein cooling operation if dynamic-only cooling is configured.

NOTEThe potential-free contact NO8 / C8 / NC8 can be used to switch heatingcomponents in heating or cooling operation (e.g. room temperaturecontrollers Chapt. 10.6.2 on pp. 86 )

Passive cooling The cooling system can be supplied using either the existing heatcirculating pump (M13) or an additional cooling circulating pump(M17).

NOTEThe cooling circulating pump (M17) operates continuously in the “Cooling”operating mode.

With passive cooling, the operating behaviour of the heatcirculating pump (M13) can be influenced by removing orinserting cable bridge A5, depending on the hydraulic integration.

Operating mode Bridge A5inserted

Bridge A5removed

Heating M13 active M13 activeCooling M13 not active M13 active

Operating mode Preconfiguration Settings Main circuit 1. Heating

circuit2. Heating

circuit CoolingMixer for heating circuit 2

1. Heating circuit

2. Heating circuit

Dynamiccooling

Silentcooling M13 M14 M15 M17 M22

Heating Yes No Yes No Active Active not active not active Continuous OPEN

Heating Yes No No Yes Active Active not active not active Continuous OPEN

Heating Yes Yes Yes No Active Active Active not active RegulationHeating Yes Yes No Yes Active Active Active not active RegulationHeating Yes Yes Yes Yes Active Active Active not active Regulation

Cooling Yes No Yes No active 1

1. Not active during passive cooling with bridge A5 inserted

Overview of circulating pumps and mixer control in heating and cooling operation (active and passive)

Active not active Active Continuous CLOSED

Cooling Yes No No Yes active 1 Active Active Active Regulation

Cooling Yes Yes Yes No active 1 Active not active Active Continuous CLOSED

Cooling Yes Yes No Yes active 1 not active Active Active Regulation

Cooling Yes Yes Yes Yes active 1 Active Active Active Regulation

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7.5.4

7.5.4 Silent and Dynamic CoolingDifferent system configurations can be implemented according toeach integration diagram. Make selections in the menu item“Settings – Cooling”.

Dynamic-only cooling (e.g. fan convectors)Regulation according to a fixed setpoint. Adjust the returnflow set temperature in the “Settings” menu item.Silent-only cooling (e.g. underfloor heating, wall panelheating or cooled ceilings)Regulation according to the room temperature. Regulation isbased on the temperature of the room where the roomclimate control station 1 is connected according to the circuitdiagram. Set the desired room temperature in the “Settings”menu item.The maximum transferrable cooling capacity for silent

cooling is heavily dependent on the relative humidity. Highhumidity reduces the maximum cooling capacity, becausethe flow temperature can not be lowered any further oncethe calculated dew point has been reached.Combination of dynamic and silent coolingRegulation is carried out separately in two different controlcircuits.The dynamic circuit is regulated according to a fixed setpoint(as described for dynamic cooling).

Silent cooling is regulated on the basis of the room temperature(as described for silent cooling) by controlling the mixer forheating circuit 2 (silent heating and cooling circuit).

NOTEIf the cooler switches off because the minimum flow temperature of 7 °Chas been reached, then either the water flow rate must be increased or ahigher return flow set temperature must be set (e.g. 16 °C).

7.6 Individual room regulationHeating systems are normally equipped with an automaticmechanism for separately regulating the room temperature ineach room.The room thermostats measure the current temperature inheating operation. If the current temperature undershoots the settemperature, the thermostats activate the regulating device (e.g.actuator).

In cooling operation, the room thermostats must be eitherdeactivated or replaced with units which are suitable for bothheating and cooling.The room thermostat responds inversely in cooling operation i.e.if the set temperature exceeds the current temperature, theregulating device is activated.

7.6.1 Dynamic CoolingWith dynamic cooling, the room temperature is regulated withspecial room temperature controllers, which can be switchedfrom heating to cooling operation using an external signalsupplied by the cooling controller. This is done by connecting a

cable from the cooling controller to the room thermostat forheating/cooling. If the return flow temperature is constant, theroom temperature is regulated using a controllable volume flow(e.g. with cooling coils) or fan levels (e.g. with fan convectors).

7.6.2 Silent CoolingThe design of the cooling controller offers the option of bothcentral cooling which is regulated according to a reference room,or prioritised central regulation with secondary regulation ofindividual rooms.

Central regulationIf the room thermostats are fully opened in cooling operation (e.g.manually), the room temperature is regulated centrally accordingto the room set temperature on the cooling controller and themeasured values of the room climate control station. The roomthermostats in rooms that do not require cooling should beclosed completely.

Regulation of individual roomsBy using room temperature controllers for heating/cooling -which can be switched from heating to cooling operation -different setpoint temperatures can be set in individual rooms(Chapt. Fig. 10.2: on pp. 85). The room thermostats are switchedfrom heating to cooling operation via a signal supplied by thecooling controller (floating contact).

Selection of the reference room The current temperature and humidity are measured in areference room via a room climate control station. If the room settemperature on the cooling controller is overshot, the flow settemperature is continually lowered until the desired roomtemperature is reached.

NOTEThe room climate control station must be fitted in the room within thethermal envelope of the building where the lowest room temperature isrequired (e.g. bedroom or living room).

A foil sensor should be connected to the room temperaturecontroller in the following applications. If condensate forms onthe cooling surfaces, the foil sensor stops cooling operation inthe room:

Cooling systems in which the cooling pipes are only partiallycovered (e.g. convective cooled ceilings) Rooms with fluctuating humidity (e.g. conference rooms)

68

Control and Regulation 7.8.1

7.7 Hot water preparationThe heat exchanger area installed in the hot water cylinder mustbe dimensioned so that the maximum heat output of the heatpump can be transferred when the temperature spread remainsunder 10 K. The heat output of, for example, air-to-water heat

pumps rises with the external temperature. For this reason, theheat exchanger area in the hot water cylinder must bedimensioned for the heat output in summer (externaltemperature approx. 25 °C).

7.7.1 Request for Hot Water without Additional Heat ExchangerWhen hot water is requested during heating operation, the heatpump controller switches off the heat circulating pump (M13) andswitches on the hot water circulating pump (M18). The heat flowof the heat pump is then tapped upstream from the buffer tankand is diverted to the heat exchanger in the hot water cylinder.

When the desired hot water temperature has been reached, theheat circulating pump is switched on again. The heat consumersof the heating system are now supplied with the heat output ofthe heat pump.

7.7.2 Request for Hot Water with Additional Heat ExchangerIn the case of heat pumps with additional heat exchangers, thehot water circulating pump also operates in heating and coolingoperation and uses the higher hot gas temperature for domestichot water preparation (adjustable maximum temperature).Parallel operation enables approx. 10 % of the heat output to betransferred at a higher temperature level.If no heating or cooling is requested for a long period of time (e.g.during transition periods), the heat pump operates exclusively for

domestic hot water preparation. In this case, domestic hot wateris prepared as described in Chapt. 7.7.1 on pp. 69.

NOTEWhen heat pumps with additional heat exchangers are installed outdoors,both the heating flow and return flow pipes as well as two additionalthermally-insulated pipes for waste heat recovery must be laid in theground. In special cases, the waste heat recovery can be deactivated andthe domestic hot water prepared as with standard heat pumps.

7.7.3 Waste Heat Recovery in Cooling OperationThe waste heat is normally discharged outside in coolingoperation. A heat exchanger installed in the hot gas of thecooling circuit (immediately after the compressor) can use thisfreely available waste heat at temperatures of up to 80 °C fordomestic hot water preparation. Additional energy consumerscan also be connected to the hot water system.The hot water circulating pump (M18) heats up the hot watercylinder in cooling operation to an adjustable maximumtemperature. The hot water circulating pump is subsequentlyswitched off and the swimming pool circulating pump (M19)

switched on. Waste heat is now discharged either via aswimming pool heat exchanger or a buffer tank. By using a buffertank, several heat consumers can be supplied simultaneously(e.g. underfloor heating and heated towel rail).

NOTEThe waste heat produced in cooling operation is first used for domestichot water preparation and subsequently for supplying additional heatconsumers or is then temporarily stored in a buffer tank. If the waste heatcan not be fully utilized, the residual heat is dissipated to the surroundingair.

7.8 Special accessories

7.8.1 Room climate control stationWith cooling using panel heating/cooling systems, regulation iscarried out according to the room temperature and humiditymeasured by the room climate control station.This is done by setting the desired room temperature on the heatpump manager. The minimum possible cooling watertemperature is calculated from the room temperature andhumidity measured in the reference room. The control responseof the cooling system is influenced by the currently measuredroom temperature and the set room set temperature.

Fig. 7.4: Room climate control station

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7.8.2

7.8.2 Heating/cooling ON/OFF room temperature controllerThe RTK 601U is automatically switched between “Heating” and“Cooling” mode using the change-over contact of the coolingcontroller. The room temperature controller can be mounted inflat switch mounting frames (50 x 50 mm according toDIN 49075).

Controlling range 5-30 °C Operating voltage 24 V~/50 Hz

Switching capacity AC 24 V~/50 Hz Connection of up to 5 valve actuators (24 V~, closed whende-energised) As an option, the dew point sensor TPF 341 can beconnected to interrupt the cooling operation in case ofcondensate formation.

7.8.3 Remote controlA remote control adds convenience and is available as a specialaccessory. Operation and menu navigation are identical to that ofthe heat pump manager. However, additional functions can beused by means of supplementary pushbuttons (for a detaileddescription, see remote control instructions). The remote controlis connected via a 6-core telephone cable (special accessory)with modular plugs.

NOTEIn the case of heating controllers with a removable operating element,this can also be used directly as a remote control.

70

Comparison of Heat Pump Cooling Systems 8.4

8 Comparison of Heat Pump Cooling SystemsHeat pumps for heating purposes are used primarily for heatingbuildings and domestic hot water preparation. The air, ground orground water are used as a heat source. For economic reasons,air-to-water heat pumps are increasingly being used to heatbuildings.The requirements for cooling can be quite varied. On the onehand, technical systems must frequently be cooled year-round toensure the operational safety of e.g. networks. On the otherhand, nightly cooling down of individual parts of the building'sstructure (thermal activation of structural building parts) isnormally sufficient in buildings which are thermally insulated to ahigh standard and have a low passive solar energy gain.

The decision-making process should take the following intoconsideration:

Costs of tapping the cold source Controllability of the flow temperaturesMinimum flow temperatures in cooling operation (coolinglimit)Availability of the cold source for varied cooling consumptionOperating costs for pumps and compressor in coolingoperationOperating limits

8.1 Air-to-Water Heat Pumps with Active Cooling

8.2 Brine-to-Water Heat Pumps with Active Cooling

8.3 Brine-to-Water Heat Pumps with Passive Cooling

8.4 Water-to-Water Heat Pumps with Passive Cooling

Cold source ++ Low costs of tapping the cold sourceControllability + Good controllability of the flow temperaturesCooling limits + Low flow temperatures possible in cooling operation

Availability ++ Guaranteed availability of the cold source for varied cooling requirementsOperating costs + Operating costs for pumps and compressor in cooling operation, waste heat recoveryoperating limits O Cooling at external temperatures above 15 °C possible

Cold source O Costs of tapping the cold source Controllability + Good controllability of the flow temperaturesCooling limits + Low flow temperatures possible in cooling operation (e.g. dehumidification)

Availability O Cold source must be dimensioned for both heating and cooling operationOperating costs + Operating costs for pumps and compressor in cooling operation, waste heat recoveryoperating limits + Year-round heating or cooling operation in combination with borehole heat exchangers

Cold source O Costs of tapping the cold source Controllability - Poor controllability of the flow temperaturesCooling limits - Flow temperatures dependent on the temperature of the borehole heat exchanger

Availability O Cold source must be dimensioned for both heating and cooling operationOperating costs ++ Low operating costs in cooling operation (brine circulating pump only)Operating limits + Cooling throughout the year subject to the brine temperature

Cold source O Costs of tapping the cold source Controllability + Flow temperatures controllable up to cold source temperature Cooling limits O Flow temperatures almost constant (ground water)

Availability + Good availability of the cold source if water quality is sufficientOperating costs + Low operating costs in cooling operation (well pump only)Operating limits + Cooling throughout the year subject to the max. permissible heating

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8.5

8.5 SummaryA reversible air-to-water heat pump provides guaranteed andeasily controllable cooling of a building at low investment costs.For applications with a high cooling consumption, passivecooling systems can compensate the higher costs of tapping theheat source through lower operating costs. They also offer theoption of year-round cooling.

Reversible brine-to-water heat pumps are used wherever theavailable heat source is to be used for cooling, but the flowtemperatures are too high for passive cooling.

NOTEWhen comparing operating costs, consideration should be given towhether heat pumps - also in cooling operation - can avail of the specialtariff from the utility companies.

72

Hydraulic Integration for Heating and Cooling Operation 9.1

9 Hydraulic Integration for Heating and Cooling OperationThe generated cooling capacity is distributed using the heatdistribution system which is also to be configured for distributingcold water.Condensate can form due to the low flow temperatures,especially in the case of dynamic cooling. All pipework andexposed manifold fittings must be fitted with steam-resistantinsulation. Vulnerable points in the distribution system can alsobe equipped with a dew point monitor, available as a special

accessory. This will halt cooling operation in the event ofmoisture formation.Refer to the Project Planning and Installation Manual for HeatPumps for general information regarding the installation andintegration of heat pumps. An interactive configuration tool forselecting the correct hydraulic integration is available atwww.dimplex.de/einbindungen.

9.1 Legend

ATTENTION!The following is a schematic representation of the key components forhydraulic integration and serves as an aid for planning a customizedsystem.They do not contain all the required safety devices, components neededto maintain constant pressure and any other additional valves which maybe required for maintenance and service work as stipulated byDIN EN 12828.

NOTEAn interactive configuration tool for selecting the correct hydraulicintegration is available at www.dimplex.de/einbindungen.

1. Heat pump1.1 Air-to-water heat pump1.2 Brine-to-water heat pumps1.3 Water-to-water heat pumps1.4 Reversible air-to-water heat pump1.5 Reversible brine-to-water heat pump1.6 Reversible water-to-water heat pump2. Heat pump manager3. Buffer tank4. Hot water cylinder5. Swimming pool heat exchanger6. Passive cooling station with cooling controller N67. Heating and silent or dynamic cooling8. Fan convector with 4-wire connection for heating and

cooling9. Cooling-only circuit10. Heating-only circuit13. Heat source14. Compact manifoldE9 Flange heater, hot waterE10 2nd heat generator (HG2)E10.1 Immersion heaterE10.2 Oil/gas boilerE10.5 Solar energy systemN1 Heating controllerN2 Cooling controller for reversible heat pumpsN3/N4 Room climate control stationsN6 Cooling controller for passive coolingM11 Primary pump for heating operationM12 Primary pump for cooling operation M13 Heat circulating pump for main circuitM14 Heat circulating pump for heating circuit 1M15 Heat circulating pump for heating circuit 2 M16 Auxiliary circulating pumpM17 Cooling circulating pumpM18 Hot water circulating pumpM19 Swimming pool water circulating pumpR1 External wall sensorR2 Return flow sensorR3 Hot water sensor R4 Return flow sensor for cooling waterR5 Temperature sensor for heating circuit 2R9 Flow sensorR11 Flow sensor for cooling waterY5 Three-way distribution valveY6 Two-way shutoff valveTC Room temperature controllerEV Electrical distribution systemKW Cold waterWW Hot water

MA Mixer open MZ Mixer closed

Thermostat-controlled valve

Three-way mixer

Four-way mixer

Expansion vessel

Safety valve combination

Temperature sensor

Flow

Return flow

Heat consumer

Shut-off valve

Shut-off valve with check valve

Shutoff valve with drainage

Circulating pump

Overflow valve

Three-way reversing valve with actuator

Two-way valve with actuator

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9.2

9.2 Active, dynamic cooling

Dynamic cooling with regulation according to a fixed setpoint for fan convectors Preconfiguration Setting

Fig. 9.1: Integration diagram for mono energy heat pump operation and dynamic cooling

Operating mode Mono energy

1. Heating circuit Yes2. Heating circuit NoCooling function Active Yes

Hot water preparation No

Swimming pool preparation No

Cooling with reversible heat pumps is carried out actively, i.e. the heat pump's compressor is operational during cooling operation. The waste heat produced is transferred to the heat source (Chapt. 9.2 on pp. 74).

Dynamic cooling regulation is equivalent to regulation according to a fixed setpoint with an adjustable return flow set temperature.

To prevent the dew point being undershot in the supply lines, these must be provided with steam-resistant insulation.

Dynamic cooling via fan convectors and domestic hot water preparation Preconfiguration Setting

Fig. 9.2: Integration diagram for mono energy heat pump operation, domestic hot water preparation and dynamic cooling

Operating mode Mono energy

1. Heating circuit Yes2. Heating circuit NoCooling function Active Yes

Hot water preparation Yes

Request SensorsFlange heater Yes

Swimming pool preparation No

Dynamic cooling takes place via fan convectors, for example. Here, the indoor air flows through a heat exchanger in which the cooling water is circulating. Flow temperatures below the dew point cause condensation to form and thus lead to a cooling and dehumidification of the indoor air (Chapt. 3.5 on pp. 13).

Cooling operation of reversible heat pumps without additional heat exchangers is interrupted when a DHW request occurs.

74

Hydraulic Integration for Heating and Cooling Operation 9.3

9.3 Active, silent cooling

Silent cooling with dew point-controlled regulation for surface cooling systems Preconfiguration Setting

Fig. 9.3: Integration diagram for mono energy heat pump operation and silent cooling

Operating mode Mono energy

1. Heating circuit Yes2. Heating circuit NoCooling function Active Yes

Hot waterpreparation No

Swimming poolpreparation No

“Silent cooling” works by absorbing heat from cooled floor, wall or ceiling surfaces. The cooling water temperature here must always be kept above the dew point temperature (Chapt. 3.6 on pp. 14).

The room climate control station (RKS WPM), which must be installed in a reference room, is essential for operation. Dew point regulation of silent cooling is carried out using the temperature sensor (R5) in the mixed cooling circuit. The mixer is not active in heating operation.

Silent cooling via surface heating/cooling systems and domestic hot water preparation Preconfiguration Setting

Fig. 9.4: Integration diagram for mono energy heat pump operation, domestic hot water preparation and silent Cooling

Operating mode Mono energy

1. Heating circuit Yes2. Heating circuit NoCooling function Active Yes

Hot waterpreparation Yes

Request SensorsFlange heater Yes

Swimming poolpreparation No

In silent cooling, regulation of individual rooms is carried out using room temperature controllers for heating/cooling, which can be switched from heating to cooling operation. The room thermostats are switched from heating to cooling operation via a floating contact supplied by the cooling controller (Chapt. 10.6.2 on pp. 86).

Cooling operation of reversible heat pumps without additional heat exchangers is interrupted when a DHW request occurs.

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9.4

9.4 Active cooling with waste heat recovery

Dynamic Cooling with Air-to-Water Heat Pumps with Additional Heat Exchanger Preconfiguration Setting

Fig. 9.5: Integration diagram for mono energy heat pump operation, domestic hot water preparation with waste heat recovery and dynamic cooling

Operating mode Mono energy

Additional heat exchanger, domestic hot water

Yes

1. Heating circuit Yes2. Heating circuit NoCooling function Active Yes

Hot waterpreparation Yes

Request SensorsFlange heater Yes

Swimming poolpreparation No

In the case of reversible air-to-water heat pumps equipped with an additional heat exchanger, the waste heat produced in cooling operation can be used for domestic hot water and swimming pool preparation.

The integrated additional heat exchanger is connected via a pipe for flow and return flow, which must be additionally installed. This allows the parallel preparation of domestic hot water during cooling and heating operation. Cooling operation is not interrupted when a DHW request occurs.

Dynamic and Silent Cooling with Air-to-Water Heat Pumps withAdditional Heat Exchanger Preconfiguration Setting

Fig. 9.6: Integration diagram for mono energy heat pump operation, silent and dynamic cooling, domestic hot water and swimming pool preparation with waste heat recovery

Operating mode Mono energy

Additional heat exchanger, domestic hot water

Yes

1. Heating circuit Yes2. Heating circuit YesCooling function Active Yes

Hot waterpreparation Yes

Request SensorsFlange heater Yes

Swimming poolpreparation Yes

With air-to-water heat pumps with additional heat exchangers, parallel swimming pool preparation is also possible during cooling operation. The swimming pool heat exchanger can be replaced by a buffer tank of any desired size, in order for waste heat produced in cooling operation to be used by other heat consumers.

During waste heat recovery, the set temperature for domestic hot water can be raised using the settings on the heat pump manager.

76

Hydraulic Integration for Heating and Cooling Operation 9.4

Dynamic Cooling with Brine-to-Water Heat Pumps with Additional Heat Exchanger Preconfiguration Setting

Fig. 9.7: Integration diagram for monovalent heat pump operation, dynamic cooling and waste heat recovery for domestic hot water preparation

Operating mode Monova-lent

Additional heat exchanger, domestic hot water

Yes

1. Heating circuit Yes2. Heating circuit NoCooling function Active Yes

Hot waterpreparation Yes

Request SensorsFlange heater Yes

Swimming poolpreparation No

The heat output to be discharged to the borehold heat exchangers is calculated using the cooling output of the heat pump plus the electric power consumption of the heat pump as calculated in the design (Table 5.1 on pp. 38).

In cooling operation, domestic hot water temperatures of up to 60°C are achieved during waste heat recovery.

NOTEDomestic hot water preparationwith two compressors can onlytake place in parallel operation.

Dynamic and Silent Cooling with Air-to-Water Heat Pumps with Additional Heat Exchanger Preconfiguration Setting

Fig. 9.8: Integration diagram for monovalent heat pump operation, silent and dynamic cooling with waste heat recovery for domestic hot water preparation

Operating mode Monova-lent

Additional heat exchanger, domestic hot water

Yes

1. Heating circuit Yes2. Heating circuit YesCooling function Active Yes

Hot waterpreparation Yes

Request SensorsFlange heater Yes

Swimming poolpreparation No

For systems with two heating circuits, both silent and dynamic cooling is possible in cooling operation. Using the “Cooling” settings, circulating pump M14 or M15 can be deactivated in cooling operation (Table ?????.? on pp. 67).

Hydraulic uncoupling is carried out using a “dual differential pressureless manifold”. Operation of the circulating pump (M16) in the generator circuit with the compressor in heating operation only, to avoid unnecessary operation.

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9.5

9.5 Passive Cooling with Brine-to-Water Heat Pumps

Brine-to-water heat pumps in a compact design Preconfiguration Setting

Fig. 9.9: Integration diagram for mono energy operation of compact brine-to-water heat pumps, silent and dynamic cooling and domestic hot water preparation

Operating mode Mono energy

1. Heating circuit Yes2. Heating circuit NoCooling function passive Yes

System design 2-pipe system

Hot waterpreparation Yes

Request SensorsFlange heater Yes

Cooling is carried out passively, i.e. the compressor is not operational in cooling operation. The cooling output is produced via a heat exchanger, which is cooled by the brine. With silent cooling and an unmixed heating circuit, undershooting of the dew point is prevented via surging of the brine circulating pump (M12) in the passive cooling station.

With brine-to-water heat pumps, cooling operation is interrupted for the duration of the domestic hot water preparation (setting “Parallel Cooling - DHW”)

Brine-to-water heat pumps in a universal design Preconfiguration Setting

Fig. 9.10: Integration diagram for monovalent operation of brine-to-water heat pumps with domestic hot water preparation and silent cooling via a mixed heating circuit

Operating mode Monova-lent

1. Heating circuit Yes2. Heating circuit YesCooling function passive Yes

System design 2-pipe system

Hot waterpreparation Yes

Request SensorsFlange heater Yes

Swimming poolpreparation No

The separation of generator and consumer circuit permits the parallel operation of passive cooling and domestic hot water preparation. The setting “Parallel Cooling - DHW” must be activated in order to do this.

With two heating circuits and silent-only cooling, the mixer takes over the task of preventing undershooting of the dew point. The circulating pump (M14) of the unmixed heating circuit is not actuated by the controller in cooling mode (Table ?????.? on pp. 67).

78

Hydraulic Integration for Heating and Cooling Operation 9.6

9.6 Passive Cooling with Compact Manifold

Passive Cooling with Silent Cooling Preconfiguration Setting

Fig. 9.11: Integration diagram for monovalent operation of brine-to-water heat pumps and silent cooling

Operating mode Monova-lent

1. Heating circuit Yes2. Heating circuit NoCooling function passive Yes

System design 2-pipe system

Hot waterpreparation No

Swimming poolpreparation No

If a KPV 25 compact manifold is used, the three-way reversing valve must be installed in the return flow between the compact manifold and the heat pump. The flow can be connected directly to the compact manifold.

With silent cooling and an unmixed heating circuit, undershooting of the dew point is prevented via surging of the brine circulating pump (M12) in the passive cooling station. The heat circulating pump (M13) runs in continuous operation during cooling.

Passive cooling with silent cooling and parallel domestic hot water preparation Preconfiguration Setting

Fig. 9.12: Integration diagram for monovalent operation of brine-to-water heat pumps with silent cooling and domestic hot water preparation

Operating mode Monova-lent

1. Heating circuit Yes2. Heating circuit NoCooling function passive No

System design 2-pipe system

Hot waterpreparation Yes

Request SensorsFlange heater Yes

Swimming poolpreparation No

If a KPV 25 compact manifold is used, the three-way reversing valve must be installed in the return flow between the compact manifold and the heat pump. The two-way valve in the heat flow enables the parallel operation of passive cooling with simultaneous domestic hot water preparation.

The heating controller (N1) and the cooling controller (N6) are connected by a three-core cable. All settings are made on the control panel of the heat pump manager.

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9.7

9.7 Passive Cooling with Separate Heating and Cooling Circuits

Cooling throughout the year with brine-to-water heat pumps Preconfiguration Setting

Fig. 9.13: Integration diagram for monovalent operation of standard brine-to-water heat pumps with a heating-only circuit and a silent or dynamic cooling circuit

Operating mode Monova-lent

1. Heating circuit Yes2. Heating circuit NoCooling function passive No

System design 4-pipe system

Hot waterpreparation Yes

Request SensorsFlange heater Yes

Swimming poolpreparation No

Hydraulic isolation of the heating and cooling circuits is appropriate for passive cooling systems if some rooms must be cooled and others heated simultaneously. It is also suitable when the heating system cannot be operated with cooled water.

The cooling circulating pump (M17) operates continuously in cooling mode.

The heating functions are active when cooling mode is activated.

Passive cooling with 4-pipe fan convectors Preconfiguration Setting

Fig. 9.14: Integration diagram for monovalent operation of standard brine-to-water heat pumps with a heating-only circuit and a dynamic cooling circuit via fan convectors

Operating mode Monova-lent

1. Heating circuit Yes2. Heating circuit NoCooling function passive No

System design 4-pipe system

Hot waterpreparation Yes

Request SensorsFlange heater Yes

Swimming poolpreparation No

Fan convectors with two connections each for heating and cooling water permit the cooling of individual rooms whilst other rooms are still being heated.

In systems containing a 4-pipe system, the cooling circuit must also be equipped with all safety devices required according to DIN EN 12828 and with the components needed to maintain pressure.

80

Hydraulic Integration for Heating and Cooling Operation 9.8

9.8 Passive Cooling with Ground Water

Water-to-water heat pumps with silent cooling Preconfiguration Setting

Fig. 9.15: Integration diagram for monovalent operation of water-to-water heat pumps and silent cooling via a mixed heating circuit

Operating mode Monova-lent

1. Heating circuit Yes2. Heating circuit YesCooling function passive Yes

System design 2-pipe system

Hot waterpreparation No

Swimming poolpreparation No

With passive cooling using well water, the wall-mounted WPM PK cooling controller must be used. The heat exchanger is designed for the required cooling output and hydraulically connected in series to the evaporator of the heat pump. The quality of the well water must be taken into consideration when selecting the heat exchanger material (Chapt. 6.1 on pp. 60). Unlike passive cooling with brine-to-water heat pumps, no additional primary pump for cooling is required (Chapt. 7.4 on pp. 66)

Water-to-water heat pumps with silent cooling and domestic hot water preparation Preconfiguration Setting

Fig. 9.16: Integration diagram for monovalent operation of water-to-water heat pumps with domestic hot water preparation and silent cooling via a mixed heating circuit

Operating mode Monova-lent

1. Heating circuit Yes2. Heating circuit YesCooling function passive Yes

System design 2-pipe system

Hot waterpreparation Yes

Request SensorsFlange heater Yes

Swimming poolpreparation No

In silent cooling with ground water, the mixer in the heating/cooling circuit takes over the dew point-controlled regulation.

Silent-only cooling can also take place without a mixer, as with brine-to-water heat pumps. However, installing a mixer reduces the occurrence of surges in the ground water pump in cooling operation.

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9.8

Passive Cooling with Water-to-Water Heat Pumps Preconfiguration Setting

Fig. 9.17: Integration diagram for monovalent operation of water-to-water heat pumps, dynamic and silent cooling via a mixed heating circuit

Operating mode Monova-lent

1. Heating circuit Yes2. Heating circuit YesCooling function passive Yes

System design 2-pipe system

Hot waterpreparation No

Swimming poolpreparation No

In systems with more than two heating circuits which are not all to be cooled, the return flows of the cooling circuits must be combined together and switched to the cooling exchanger via the 3-way reversing valve.

The return flows of the heating-only circuits must be hydraulically directed to the heat pump after the 3-way reversing valve.

NOTEIn passive cooling, the coolingwater can, in principle, also bedirected via the buffer tank.

Passive Cooling with Water-to-Water Heat Pumps and Domestic Hot Water Preparation Preconfiguration Setting

Fig. 9.18: Integration diagram for monovalent operation of water-to-water heat pumps with domestic hot water preparation, dynamic and silent cooling via a mixed heating circuit

Operating mode Monova-lent

1. Heating circuit Yes2. Heating circuit YesCooling function passive Yes

System design 2-pipe system

Hot waterpreparation Yes

Request SensorsFlange heater Yes

Swimming poolpreparation No

In systems with domestic hot water preparation, the heat exchanger can be installed before or after the heat pump.

A heat exchanger installed before the heat pump improves the COP in domestic hot water preparation when cooling is carried out simultaneously, as the heat source temperature is raised.If the heat exchanger is installed after the heat pump, then the heat source temperature is lower, and thus the cooling capacity is increased.

82

Hydraulic Integration for Heating and Cooling Operation 9.8

Cooling throughout the year with water-to-water heat pumps. Preconfiguration Setting

Fig. 9.19: Integration diagram for monovalent operation of standard water-to-water heat pumps with a heating-only circuit and a dynamic cooling circuit

Operating mode Monova-lent

1. Heating circuit Yes2. Heating circuit NoCooling function passive Yes

System design 4-pipe system

Hot waterpreparation No

Swimming poolpreparation No

Hydraulic isolation of the heating and cooling circuits is appropriate for passive cooling systems if some rooms must be cooled, and is also suitable when the heating system is not to be operated with cooled water. The cooling circulating pump (M17) operates continuously in cooling mode.

Cooling throughout the year with water-to-water heat pumps with domestic hot water preparation Preconfiguration Setting

Fig. 9.20: Integration diagram for monovalent heating operation of standard water-to-water heat pumps with domestic hot water preparation, a heating-only circuit and a dynamic cooling circuit.

Operating mode Monova-lent

1. Heating circuit Yes2. Heating circuit NoCooling function passive Yes

System design 4-pipe system

Hot waterpreparation Yes

Request SensorsFlange heater Yes

Swimming poolpreparation No

In systems containing a 4-pipe system, the cooling circuit must also be equipped with all safety devices required according to DIN EN 12828 and with the components needed to maintain pressure.

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10

10 Electrical InstallationThe electrical installation of the heating controller is described inthe Dimplex Project Planning and Installation Manual for HeatPumps for Heating Purposes and in the installation instructionsfor the heat pump manager.

ATTENTION!The circuit diagrams shown in this chapter can vary from case to casedue to the number of different heat pumps for heating and coolingpurposes. The circuit diagram affixed to the inside of the heat pumpswitchbox must be adhered to during the electrical installation.

10.1 Cooling controller for reversible heat pumps The input and output connections additionally required byreversible heat pumps are provided on a cooling controller (N2/N17). 1) Room climate control stations 2) Heat circulating pump of heating circuit 1 (M14)3) Swimming pool circulating pump (M19)

4) Optional fault indicator (H5)5) Optional cooling circulating pump (M17)

NOTECooling controller N2 for reversible brine-to-water heat pumps with wasteheat recovery has been replaced by two cooling modules, N17.1 andN17.2.

10.2 Cooling controller for passive cooling In addition to the installation of the heating controller, thefollowing components must be connected to the passive coolingcontroller N6:1) Room climate control station (N3)

on terminal block N6-J22) Optional room climate control station 2 (N4)

on terminal block N6-J33) Heat circulating pump of heating circuit 1 (M14)

on terminal N6-N01

4) Reversing valves (Y5,Y6) for hydraulic isolation on terminal N6-N05

5) Swimming pool circulating pump (M19) on terminal N6-N026) Optional fault indicator (H5)

on terminal N6-N037) Optional cooling circulating pump (M17)

on terminal N6-N048) Primary circulating pump for passive cooling (M12) of brine-

to-water heat pumps on terminal N6-N06

10.3 Room temperature regulation with dynamic coolingThe cooling water temperature is kept constant during dynamiccooling. Room temperature regulation is carried out by the fanconvector controller. In principle, two versions are available here:

Regulation of the water flow rateRegulation of the air flow rate via ventilation levels

Fan convectors whose heating output and cooling capacity canbe regulated via ventilation levels should preferably be used inconnection with a heat pump. In this case, the water flow ratethrough the heat pump is ensured even when there is a lowheating or cooling requirement.The room temperature controller is usually included in the scopeof supply of the fan convector. Switching from heating to coolingoperation can be done in different ways:

Manual switchingAutomatic switching of the room thermostats via a floatingcontact on the heat pump managerIntegrated controller with automatic switch-over dependingon the flow temperature

Fig. 10.1: Diagram showing electrical connections for room temperature regulation for dynamic cooling using switchable room thermostats

84

Electrical Installation 10.5

10.4 Room climate control station with silent coolingWith silent cooling, the flow temperature is regulated dependingon the room set temperature and the determined dew point limittemperature. The minimum permissible temperature on thecooling surface is calculated by the heat pump manager based inthe room temperature and humidity of a reference roommeasured by the room climate control station (RKS WPM)(Fig. 10.2 on pp. 85).

Room climate control station wiringElectrical connecting cable (5-core) to the heat pump manager.Maximum cable length 30 m, cross section 1.5 mm². A shieldedcable should be used for a common installation with a mainscable.Additional room temperature controllers must be used whenthere are multiple rooms which are to be regulated individually bythe user (Chapt. 10.6 on pp. 86).

Fig. 10.2: Diagram showing electrical connections for room temperature regulation for silent cooling with room climate control and switchable room thermostats

10.5 Extended dew point monitoringExtended dew point monitoring serves to protect the distributionsystem (e.g. heating circuit manifold) from the formation ofcondensate. If condensate then forms, the cooling operation ofthe entire system is interrupted.

NOTEExtended dew point monitoring acts like an automatic switch-off, which isnot reset again until the dew point sensor is completely dry.

Dew point monitorThe dew point monitor converts the signals of the individual dewpoint sensors into a blocking signal for the heat pump manager.A maximum of 5 dew point sensors can be connected.

The dewpoint monitor interrupts the cooling operation of theentire system if condensation forms on at least one dew pointsensor.

Dew point monitor wiring3-core electrical connection line to the cooling controller

Dew point monitor wiringThe supply lead of the dew point sensor to the dew point monitorcan be extended to 20 m using a “standard cable” (e.g.2x 0.75 mm) and up to 150 m when using a shielded cable (e.g.I(Y) STY 2x 0.8 mm). Installation must always be carried outseparately from live cables.

Legend:

N1 Heating controllerN2 Cooling controllerEV Electrical distribution system13 Surface heating15 Room climate control station16 Switchable room thermostat17 Underfloor manifold for heating / cooling

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10.6

10.6 Regulation of the Room Temperature In the case of silent cooling, the flow temperature is regulatedcentrally based on the room temperature and the humidity in areference room. Switchable room temperature controllers areused to set the desired room temperatures individually (seeFig. 10.2 on pp. 85).

Room temperature controller heating/coolingIn heating operation, the heating water flow is stopped when theroom set temperature is overshot. In cooling operation, thecooling water flow is stopped when the room set temperature isundershot.An additional dew point sensor can be connected to theRTK 601U room temperature controller (available as anaccessory); this sensor stops the cooling of a room whencondensate forms on the cooling surface.

NOTEIn rooms with open cooling systems (e.g. cooled ceilings) and in roomswith greatly varying humidity (e.g. conference rooms), we recommend theuse of an additional dew point sensor on the cooling surface, which stopsthe actuator of the respective room when condensate forms.

Fig. 10.3: Circuit diagram for room temperature controller heating/cooling

10.6.1 Room temperature controller for manual switchingThe use of a combined system means that either heating orcooling water is present in the heating circuit manifold for everyroom. Manual reversal of the switch on the RTK 602U switchesthe control response around in cooling operation.

NOTEIn rooms which are not to be cooled (e.g. bathrooms), switchable roomtemperature controllers prevent the occurrence of unwanted coolingwhen the room set temperature is undershot.

10.6.2 Room temperature controller with automatic switchingThe heat pump cooling controller (N2/N6/N17) is equipped with afloating contact for automatically switching the room thermostatsfrom heating to cooling operation.This switching contact can be used on the RTK 601U roomtemperature controller (available as a special accessory) forautomatically switching to cooling operation.

NOTEIn rooms which are not to be cooled (e.g. bathrooms), the actuator isallocated a “Continuous OFF” command in cooling operation if the mass(contact F) is hard-wired to the dew point inlet.

Fig. 10.4: RTK 601U circuit diagram (individual room)

86

Electrical Installation 10.6.2

Room temperature controller wiring (see also Fig. 10.2 on pp. 85)

Installation of a 24 V~/50 Hz voltage supply to every heatingcircuit manifold for the room temperature controllers andelectrothermal actuators (24 V~, closed when de-energized)via a transformer to be provided by the customer.A five-core cable must be installed from the heating circuitmanifolds to every room temperature controller (2-corevoltage supply, 2 -core switching heating/cooling, 1 -coreswitching output for actuator).A two-core cable must be installed from the heating circuitmanifolds to the relay output of the cooling controller (N2/N6/N17). This is used for automatic switching in coolingoperation.

NOTEUp to 20 RTK 601U room temperature controllers can be interconnectedin parallel via the floating contact of the cooling controller. The supplyvoltage to the actuators is provided by an external 24V AC 50Hz supply.The transformer output must be calculated in such a way that there is nointerruption of the supply voltage, even from the start-up currents ofseveral actuators.

Fig. 10.5: RTK 601U circuit diagram (parallel connection)

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10.7

10.7 Circuit Diagrams

Fig. 10.6: Circuit diagram of the WPM 2006 R wall-mounted heat pump manager – N1 (heating controller) - Legend see Chapt. 10.8 on pp. 91

88

Electrical Installation 10.7

Fig. 10.7: Circuit diagram of the WPM 2006 R wall-mounted heat pump manager for cooling – N2 (cooling controller)

Fig. 10.8: Circuit diagram of WPM PK - N6 (passive cooling controller)

NOTEWith brine-to-water heat pumps, cold is provided by switching anadditional primary cooling pump (M12) on and off in the brine circuit. Bridge A6 must be removed (Chapt. 7.4 on pp. 66)

NOTEIf cooling is implemented via a separate pipe system (e.g. 4-pipe system)with its own cooling circulating pump (M17), the heat circulating pump(M13) can be deactivated in cooling operation via bridge A5 (Chapt. 7.5.3on pp. 67).

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10.7

Fig. 10.9: Circuit diagram for heating controller SI 30TER+ / SI 75TER+

Fig. 10.10:Circuit diagram for cooling controller SI 30TER+ / SI 75TER+

90

Electrical Installation 10.8

10.8 Legend for the circuit diagrams

A BridgesA1 Bridges: Utility company block (EnergieVersogerSperre -

EVS) - must be installed if the supply voltage is not interrupted by the energy provider

A2 Bridges: Heat pump block - frost protection guaranteedA3 Bridge for heat pumps without motor protection contact of

the primary pump or the ventilatorA4 Bridge for heat pumps without motor protection contact of

the compressorA5 Bridge for parallel operation of M13/M17 with PKSA6 Bridge for parallel operation of M11/M12A7 Bridge, supplementary heatingA8 Bridge, request for hot waterA9 Bridge, underfloor heating

B Auxiliary switchB2* Low-pressure brine controller B3* Hot water thermostatB4* Swimming pool water thermostat

E Heating, cooling and auxiliary unitsE3 Defrost end pressure switchE5 Condensation pressure switchE9 Flange heater, hot waterE10* 2. Heat generator (function selectable via controller)E13* 2. Chiller

F Safety unitF1 Control fuse of N2 / N6F2 Load fuse for plug-in terminals J12 and J13 5 x 20 / 4.0 A

slow-actingF3 Load fuse for plug-in terminals J15 to J18, 5x20/4.0 A

slow-acting F4 High-pressure switchF5 Low-pressure switchF6 Flow temp. limit thermostatF7 Safety temperature monitorF10 Flow rate switch (cooling operation)F23 Motor protection M1 / M11

H LampsH5* Remote fault indicator lamp

K Contactors, relays, contactsK1 Contactor for compressor 1K1.1 Start-up contactor for compressor 1K1.2 Time relay for compressor 1K2 Contactor (relay) ventilator 1K3 Contactor for compressor 2K3.1 Start-up contactor for compressor 2K3.2 Time relay for compressor 2K4 Contactor ventilator 2K5 Contactor, primary pump - M11K6 Contactor, primary pump 2 - M20K7 Semiconductor relay, defrostingK8 Contactor / relay for supplementary heatingK9 Coupling relay 230 V/24 V for defrost end or flow

temperature limitK11* Electronic relay for remote fault indicatorK12* Electronic relay for swimming pool water circulating

pumpK20* Contactor for HG2K21* Contactor, flange heater for hot waterK22* Utility blocking contactor (EVS)K23* Auxiliary relay for blockK28* External switching to cooling operation

M MotorsM1 Compressor 1M2 Ventilator

M3 Compressor 2M11* Heat source primary pumpM12* Primary pump passive cooling M13* Heat circulating pump for main circuitM14* Heat circulating pump for heating circuit 1 for coolingM15* Heat circulating pump for heating circuit 2/3M16* Auxiliary circulating pumpM17* Cooling circulating pumpM18* Hot water circulating pump (load pump)M19* Swimming pool water circulating pumpM20* Primary pump for 2nd heat sourceM21* Mixer for bivalent or heating circuit 3M22* Mixer for heating circuit 2

N Control elementsN1 Heating controllerN2 Cooling controller (reversible heat pump)N3 Room climate control station 1N4 Room climate control station 2N5 Dew point monitorN6 Cooling controller (passive cooling)N9 Room thermostat (switchable)N10* Remote controlN11* Relay moduleN14 Control panel for WPM 2007Q1 Miniature circuit breaker M11

R Sensor, resistorsR1 External sensorR2 Return flow sensorR3* Hot water sensorR4 Return flow sensor for cooling waterR5* Sensor for heating circuit 2R6 Freeze protection sensorR7 Coding resistorR8 Flow sensor, coolingR9 Flow sensor (antifreeze sensor)R10.1- 5*

Dew point sensor (humidity sensors for N5 - max. of 5 sensors)

R11 Flow sensor for cooling waterR12 Defrost end sensorR13 Sensor for heating circuit 3 / renewable sensorR17* Room temperature sensorR18 Hot gas sensorR20 Swimming pool sensor

T T-TransformerT1 Safety transformer 230/24V AC

W CablesW1 Control line, 15-poleW1 - # Core number of cable W1

W1-#8 must always be connected!

X Terminals, manifold, plugsX1 Supply connection terminal strip 230 V (L/N/PE)X2 Extra-low voltageX3 Extra-low voltageX4 Plug connector terminalX5 Distribution board terminal 0V ACX8 Control line plug connector (extra-low voltage)X11 Control line plug connector 230 V AC

Y ValveY1 Four-way reversing valveY5* Three-way distribution valveY6* Two-way shutoff valve

* Supplied by the customer, optional

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10.9

10.9 Heat pump manager terminal assignation

N1 Heating controllerN1-J1 Power supply (24 V AC / 50 Hz)N1-J2-B1 External sensor - R1N1-J2-B2 Return flow sensor - R2N1-J2-B3 Hot water sensor - R3N1-J3-B4 Coding - R7N1-J3-B5 Flow sensor or antifreeze sensor heating - R9N1-J4-Y1 DefrostingN1-J4-Y2 Fault indicator lamp - H5 via K11N1-J4-Y3 Swimming pool water circulating pump - M19 via K12N1-J5-ID1 Hot water thermostat - B3 N1-J5-ID2 Swimming pool water thermostat - B4N1-J5-ID3 Utility company blockN1-J5-ID4 BlockN1-J5-ID2 Fault on fan / primary pump - M2 / M11N1-J5-ID6 Compressor fault - M1 / M3N1-J5-ID8 Flow rate switch (cooling operation)N1-J5-ID7 Defrost end pressure switch - E3; Flow temp. limit pressure switch - F6N1-J6-B6 Sensor for heating circuit 2 - R5 and defrost end sensorN1-J6-B7 Flow temperature limit sensor - R6; defrost end sensor - R12N1-J6-B8 Flow sensor, cooling - R8; sensor for heating circuit 3 / renewable sensor - R13N1-J7-ID9 Low pressure brine controller - B2N1-J7-ID10 Hot gas thermostat - F7N1-J7-ID11 Switching protocol TAEN1-J7-ID12 External switching to cooling operation - K28N1-J8-ID13H High-pressure switch - 230 V AC - F4N1-J8-ID13 High-pressure switch - 24 V AC - F4N1-J8-ID14 Low-pressure switch - 24 V AC - F5N1-J8-ID14H Low-pressure switch - 230 V AC - F5N1-J10 Remote control - N10 / control panel - N14N1-J11 Connection for pLANN1-J12-NO1 Compressor 1 - M1N1-J13-NO2 Compressor 2 - M3N1-J13-NO3 Primary pump - M11 / ventilator - M2N1-J13-NO4 2. Heat generator (E10)N1-J13-NO5 Heat circulating pump - M13N1-J13-NO6 Hot water circulating pump - M18N1-J14-NO7/N08 Mixer open/closed - heating circuit 1 - M14N1-J16-NO9 Auxiliary circulating pump - M16N1-J16-NO10 Flange heater for hot water - E9N1-J16-NO11 Heat circulating pump for heating circuit 2/3 - M15N1-J17-NO12/NO13 Mixer open/closed - heating circuit 2 - M22

N2 (N6) Cooling controllerN2-J1 Power supply (24 V AC / 50 Hz)N2-J2-B1 Humidity room climate control station - N3N2-J2-B2 Humidity room climate control station - N4N2-J2-B3 Flow sensor for cooling water - R11 / hot gas sensor - R18N2-J2-B4 Return flow sensor for cooling water - R4N2-J3-B5 Temperature room climate control station - N3N2-J3-B6 Temperature room climate control station - N4N2-J5-ID1 Dew point monitor - N5N2-J5-ID3 Condensation pressure switch - E5N2-J11 Connection for pLANN2-J12-NO1 Heat circulating pump of heating circuit 1 - M14N2-J12-NO2 Swimming pool water circulating pump - M19N2-J12-NO3 Fault indicator lamp - H5N2-J13-NO4 Four-way reversing valveN2-J14-NO7 2. ChillerN2-J15-NO8 Room thermostat (switchable) - N9

N17 Cooling controllerN17.1-J10-B3 Humidity room climate control station - N3N17.1-J10-B4 Humidity room climate control station - N4N17.1-J9-B1 Temperature room climate control station - N3N17.1-J9-B2 Temperature room climate control station - N4N17.1-J5-NO1 Heat circulating pump of heating circuit 1 - M14N17.2-J4-ID4 Dew point monitor - N5N17.2-J5-NO3 Swimming pool water circulating pump - M19N17.2-J10-B4 Swimming pool sensor R20* Supplied by the customer, optional

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Appendix 11.1

11 Appendix

11.1 Glossary of Cooling TermsAnnual effort figure of system eP

The system's annual effort figure denotes the primary energyconsumed by the system to meet the annual heat consumption ofa building. The annual effort figure of the system is expressed asa ratio. It is the inverse of the efficiency of the individual systemcomponents. The lower the system's annual effort figure, themore efficiently it will operate. The method for calculating thesystem’s annual effort figure is specified in DIN 4701 Part 10.

Absolute humidity The absolute humidity denotes the vapour content of the air in g/kg (g water per kg of dry air). Air always contains a certain massof water. This mass remains constant even if the air is heated orcooled. In contrast to the relative humidity, the absolute humiditydoes not change as long as there is no increase (e.g. due toperspiring persons) or decrease (e.g. due to condensation) in thewater content.

Active cooling with heat pumps for heating purposesCooling by reversing the process in the heat pump; by switchingthe refrigerating circuit using a four-way reversing valve, the heatpump can be operated as a refrigerating machine.

ComfortComfort is the defined tolerance zone of the indoor air conditions.It is determined essentially by the air temperature, humidity, airvelocity and the temperature of the surfaces enclosing rooms.Only when these values are within definite limits will the indoorenvironment be perceived as being comfortable.

Dynamic coolingCooling with refrigerant temperatures below the dew point usingfan convectors (forced convection). The cooling surfacetemperatures are considerably lower than the room temperatureand dehumidify the indoor air by producing condensation.

EnthalpyFrom the Greek enthálpein -> “to heat in something”. Enthalpy isthe heat content of a transfer medium, e.g. the air, as denoted bythe temperature and the humidity content. The specific enthalpyis specified in J/kg.

DehumidifyReduction in the absolute humidity.

Window ventilationExchange of indoor air for outside air using opened or tiltedwindows only. The exchange of air is uncontrollable.

Panel heating systemWater flow pipe systems in floor, wall or ceiling surfaces transferthe heat output which has been conveyed to the water evenly tothe surroundings.

Fan ConvectorsFan convectors provide heating and/or cooling for small andmedium-sized rooms, such as offices, conference rooms, classrooms, living rooms, small halls, restaurants, etc. Specialversions also have an additional air connection and sometimeseven an air-to-air heat exchanger is provided for ventilating aparticular room. Fan convectors are of flat design. They consistof a ventilator, heat exchanger, filter and panelling. Ventilatorscan be operated at several different rotational speeds using stepswitches. This makes it possible to adjust the ventilation outputaccording to the prevailing operating conditions.

Heating and cooling registersFinned tube registers are generally used to heat/cool air. Theyconsist of tubes (normally made of copper) equipped with fins(normally made of aluminium) which aid heat transfer. Theheating or cooling medium flowing in the pipes can be e.g.heating water, steam, cold water, brine or refrigerant.A moisture eliminator is usually positioned downstream from thecooling coils. It removes the water drops from the air which areproduced by cooling the air below the dew point.

Air conditioningAir conditioning is the production of defined temperatures andrelative humidity values in a room. Depending on the weatherconditions, fresh air must usually be heated, cooled, humidifiedor dehumidified accordingly.

CondensationThere are two types of condensation:a) Water separation from the air on surrounding cold surfacesb) Liquification of the refrigerant in the cold generation processIn both cases, a vaporous substance is cooled to such an extentthat it changes either totally or partially into a liquid state.

Cooled/heated ceilingsSuspended false ceilings are usually installed as ceilingpanelling in commercial buildings such as offices, conferencerooms, department stores and show rooms, as well as in utilityrooms in hospitals, etc. Cooled/heated ceilings are usually usedin such situations. Cooled ceilings function according to the silentcooling principle, i.e. the dew point must not be undershot.These systems can be used for cooling or heating depending onthe selected water temperature. Ceiling systems also fulfiladditional aesthetic, acoustic and lighting functions in the room.The surface temperature of the cooled ceiling is lowered to a fewdegrees under the room temperature using water. However, italways remains above the dew point.Because most heat sources transfer heat primarily by radiationand operate without forced convection, the physical operatingprinciple of cooled ceilings is the most convenient solution forrooms used purely as offices.However, cooled ceilings have limitations in comparison to fanconvectors for dissipating larger internal heat loads and highhumidity because of their limited maximum cooling capacity.

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11.1

Latent heatLatent heat is the humidity content (absolute) of the difference inheat content between the fresh air and exhaust air volume flows.

HumidityThe humidity content is defined in combination with the airtemperature as relative humidity. The standard measurement istaken 1.50 m above the floor in one of the rooms. The normalrelative humidity tolerance is +/- 5 %. Relative humidity valuesmay fluctuate periodically throughout the year. Higher values arepermitted in the summer months and lower values in the wintermonths (energy savings). For the room climate to remaincomfortable, the highest permissible relative humidity based on+ 23 °C room temperature is 65 %, and based on + 26 °C is55 %. We normally recommend a maximum relative humidityvalue of 55 %.

Air temperatureThe air temperature is significant in occupied rooms. It ismeasured 1.50 m above the floor as standard. The permissibletolerances are normally around +/- 0.5 K for high requirements,and are otherwise around +/- 1.0 K.Gliding temperature values for the indoor air based on theexternal temperature are normally permitted during the year(energy savings).The comfortable range of temperatures varies depending on thephysical activity of the persons in the room. Temperatures of+ 23 to 24 °C are perceived as optimal for normal office work,providing that the temperature of the enclosing surfaces isapproximately equal to the room temperature. This level ofcomfort applies worldwide and is the same for warm and coolregions.From an external temperature of around + 26 °C, the roomtemperature perceived as comfortable rises on a sliding scale.

Natural ventilationNatural ventilation using windows or light wells to exploit thethermal effect.Because the density of air varies depending on its temperature,warm air rises and cold air sinks. Depending on its velocity anddirection, outdoor wind also plays a role in natural ventilation.This method has the disadvantage that because of the naturallywide fluctuation in temperatures and wind conditions, theresulting volume flows vary extremely and can only be influencedto a limited extent.

Surface temperatureThe surface temperature of walls, ceilings, floors and windowsconsiderably influences the perception of comfort. It should betaken into account when selecting the set air temperature.Surface temperatures which are approximately equal to the roomtemperature are optimal.

Passive coolingIn the summer, the ground and the ground water are significantlycolder at greater depths than the ambient temperature. A plateheat exchanger installed in the ground water or brine circuit of aheat pump for heating purposes transfers the refrigeratingcapacity to the heating and cooling circuit.

Air conditioning for industrial processesConditions governed by production processes which arespecifically defined and which deviate from normal comfortstandards. Depending on the type of process, strict requirementsmay sometimes be set for the adherence to specifiedtemperature and humidity values or for minimising the dustconcentration, e.g. in clean rooms for chip production.

Room climate control stationTo prevent the formation of condensate during silent cooling, theflow temperature is regulated based on the dew point via a roomclimate control station.

Room thermostats for heating/coolingThe room thermostats installed in rooms which are both heatedand cooled must be provided with a switch-over mechanism.This controls the switching response so that a multiple signal istransmitted if the temperatures rise during cooling operation.

RegulationMechanism for automatic maintenance of specified conditions. Atypical control circuit consists of a sensor, controller and valvewith actuator.The sensor informs the controller of the actual value (e.g. thetemperature). The controller compares this with the setpoint andopens or closes the control valve according to the deviation ofthe actual value from the set point.

Relative humidityRelative humidity is the vapour content of the air taking thetemperature into consideration.The relative humidity value specifies which percentage of themaximum possible air humidity the air actually contains.Because warm air can contain more water vapour than cold air,the relative humidity value drops when the air is heated and theabsolute humidity remains constant.

HVAC systemAbbreviation for air-conditioning system.

Sensitive heatSensitive heat is the difference in heat content due to thetemperature difference between the fresh air and exhaust airvolume flows.This description is not true in a literal sense because latent heatis also perceived 'tangibly'.

Silent coolingCooling using panel heating systems with refrigeranttemperatures above the dew point to prevent the formation ofmoisture

RadiationRadiation characterizes the transporting of energy from warm tocold surfaces without convection, i.e. without appreciable heatingof the interlaying air layers.

Dew pointThe dew point is the temperature to which a packet of air must becooled in order to produce condensation (water separation fromthe air ). There is a relative humidity of 100 % at the dew point.The dew point can, for example, be calculated from the relativehumidity and temperature. The cooling water temperature isnormally above the dew point for silent cooling and below thedew point for dynamic cooling.

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Appendix 11.2

Dew point monitorSignal transmitter that interrupts cooling operation in the systemif condensation forms at vulnerable points in the coolingdistribution system.

Temperature stabilisationTemperature stabilisation characterises the maintenance oftemperatures by regulated heating and/or cooling.

Volume flowVolume flow denotes the air flow rate or ventilation output in airconditioning systems.

Heat consumptionThe heat consumption is calculated according to DIN 4701. Itconsists of both the transmission heat consumption as well asthe ventilation heat consumption.The heat consumption indicates what heat output is required tomaintain the room/building at a defined minimum temperature fordefined air exchanges.

Heat content of the airThe heat content of the air is denoted by the temperature and thehumidity content and is also technically defined as enthalpy in kJ/kg.

11.2 Important Standards and RegulationsVDI 2078: 1996-07Calculation of the cooling load in air-conditioned rooms(VDI cooling load regulations)

E VDI 2078 Part 1: 2002-01Cooling load calculation of air-conditioned buildings with roomcooling from cooled walls and ceilings

DIN V 4701-10: 2001-02Energy efficiency of heating and ventilation systems in buildings- Part 10: Heating, domestic hot water supply, ventilation

DIN 4710: 2003-01Statistics on German meteorological data for calculating theenergy requirements for heating and air conditioning equipment

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11.3

11.3 Estimated Calculation of the Cooling Load for Individual Rooms According to the HEA Method

Estimated Calculation of Cooling Load for Individual Rooms (HEA short method based on VDI 2078, Cooling Load Regulations) Pos Appendix:

0 Room Length[m]

Width[m]

Height[m]

Aream²

Volume m³

External cooling load

1 Solar radiation through windows and outer doors Unprotected

Building shell dimensions

Reduction factors Blind system

Orientation Widthm

Heightm

Surface area m²

SingleglazedW/m²

DoubleglazedW/m²

ThermalglazedW/m²

Safety glass internal blinds Awning Exterior

blinds

Cooling load

windows/outer doors

Watt

Cooling load

overall

Watt

N 65 60 35 NE 80 70 40 O 310 280 155

SU 270 240 135 S 350 300 165

SW 310 280 155 W 320 290 160

NW 250 240 135 Skylights 500 380 220

x 0.7 x 0.3 x 0.15

SUM windows / outer doors 1)

2 Walls (without windows and door openings)

Widthm

Heightbetween

floorsm

Deductionm² m² W/m² Watt

Ouside 10 Inside 10

SUM walls

3 Floor to rooms without air-conditioning Length Width m² W/m² Watt

10

SUM floors

4 Ceiling Flat roof Steep roof / ceiling

Length Width m²Non-

insulatedW/m²

InsulatedW/m²

Non-insulated

W/m²

Insulated

W/m²

Room w/o air-

conditioningW/m²

Watt

60 30 50 25 10

SUM ceiling

Internal cooling load 5 Lighting Sum connected load [Watt]

SUM lighting

6 Electrical devices Quantity Watt / device Watt

Computer 150 Terminals 75 Printer 50

SUM electrical device7 Persons (total)

Quantity Watt / Pers. Watt 115

SUM persons

8 Outside air m³ / h W / m ³ Watt

Manufacturer information 10 SUM outside air

SUM TOTAL COOLING LOAD : 1) Use only the maximum value for different points of the compass, add both values for adjacent points of the compass

Basis:The values specified are calculated on the basis of the VDI 2078 “cooling load regulations”.The calculation is based on a room temperature of 27 °C, an external air temperature of 32 °C and a cooler operated continuously.

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Appendix 11.3

NOTEAn online calculator for calculating the cooling load of individual roomsis available at www.dimplex.de/online-planer/kuehllastrechner.

Basic Principles / Explanation:This calculation method takes both the previously mentionedfactors and the storage capacity of the room into account. Theprinciple is based on the figures of the “VDI cooling loadregulations” in VDI 2078.The basis of the calculation is a room temperature of 27 °C, anexternal temperature of 32 °C and continuous operation of thecooler.

Item 0:Type of room, unobstructed internal dimensions, floor area androom contents.

Item 1:The window surfaces should be divided between the four pointsof the compass and multiplied by the corresponding values. Thedimensions of the wall opening (building shell dimensions)should be used for calculating the window area. Whencalculating the cooling load, the compass point (direction) shouldbe used which results in the maximum value. If different types ofwindows are installed at one point of the compass (direction),several values must then be added accordingly.Where windows are at two directly-neighbouring compasspoints, for example SW and W, the total of both values should beused.The factors should be multiplied by 10 % for undivided windowpanes larger than 2 m.Horizontal skylights should also be taken into consideration (seenote about skylights!).If blind systems are fitted, the specified reduction factors shouldbe used.

Item 2:Heat flow through walls (cooling load through walls). To simplifythe calculation method, fixed values have been set according tothe current thermal standards based on VDI 2078. Because thecooling load is not influenced decisively by the walls, thesevalues can also be used for existing older buildings.

Item 3:If the room below or the neighbouring room is not air conditionedor cooled, a corresponding value should be used.

Item 4:The ceiling surface (roof) minus any sky lights should bemultiplied by the applicable values.

Item 5:Because only a part of the lamps' connected load is convertedinto light, the total connected load should be regarded as heat. Ifthe ballast for discharge lamps is in the room to be cooled, thisshould also be taken into consideration with its correspondingoutput.

Item 6:Besides the the previously specified values, the connected loadsof additional heat-dissipating devices which are operated duringthe period of maximum solar radiation should also be taken intoconsideration, e.g. televisions, lamps and other electric devices.

Item 7:The number of persons should be multiplied by the specifiedvalue. In compliance with VDI 2078, the following assumptionswere made for the heat transfer of the human body (body heat):Activity: Physically non-active to light work, standing, degree ofactivity I to II according to DIN 1946 Part 2, room temperature26 °C.

Item 8:The ratio of outside air as specified by the manufacturer shouldbe used. The calculation is based on the volume flow of outsideair only being cooled by 5 K.

Total cooling load:The total of the individual cooling loads from items 1 to 8.

Selected air conditioner:To attain an internal temperature of approx. 5 K under thespecified external air temperature, the sensitive cooling capacityQK must be equal to or larger than the calculated cooling load.The number of air exchanges is equal to the fresh air volume flowof the device in m/h divided by the room volume in item 0.Figures above 10 are only justifiable for very carefully andexpertly planned air circuits. Otherwise, irritating draughts arelikely to occur.

Glossary: The cooling load is the sum of all acting convective heat flowswhich must be discharged if the desired air temperature in aroom is to be maintained.The sensitive cooling load is the heat flow which must bedischarged from the room to maintain a desired air temperaturewith a constant humidity content. It is equal to the sum of thecalculated convection heat flows.The latent cooling load is the heat flow required to condense amass flow of steam at air temperature, so that the desiredhumidity content in the room can be maintained at a constant airtemperature.The cooling capacity of the device is the total of the sensitiveand latent cooling capacity or refrigerating capacity generated bythe cooler. The sensitive cooling capacity of the device is thecooling capacity which it must generate to cool the air withoutforming condensation.The latent cooling capacity is the cooling capacity which thedevice must generate to remove a proportion of the water vapourcontained in the humid air by condensing. The evaporation heatcontained in the water vapour is supplied by the device in theform of cooling energy for condensation.

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11.4

11.4 Minimum Requirements for Hot Water Cylinder / Circulating PumpOn the basis of the integration set-ups recommended in this manual and standard boundary conditions.

Air-to-water heat pumpsIndoor installation - 230V

Air-to-water heat pumpsIndoor installation

Air-to-water heat pumpsOutdoor installation - 230V

Air-to-water heat pumpsOutdoor installation

Brine-to-water heat pumpIndoor installation - 230V

Brine-to-water heat pumpIndoor installation

The table shows which Hot watercirculating pumps and cylindersshould be allocated to each type of heat pump in order to obtaina hot water temperature of approx. 45 °C in operation with 1compressor (maximum temperature of the heat source: Air25 °C, brine 20 °C, water 10 °C).The maximum hot water temperature which can be attained withheat-pump-only operation is dependent on:

The heat output of the heat pump The heat exchanger surface area in the cylinderThe volume flow in relation to the pressure drop and thecapacity of the circulating pump.

NOTEHigher temperatures can be reached by implementing larger heatexchanger areas in the cylinder, by increasing the volume flow or bytargeted reheating using a heating element (see also Chapter 6.1.3 in theProject Planning Manual, “Heating”).

Heat pump Volume Heat exchanger area Order code Loading pump M18

LIK 8MER / LI 11MER 300 l 3.2 m² WWSP 332 UP 60

Heat pump Volume Heat exchanger area Order code Loading pump M18

LI 11TER+ 300 l 3.2 m² WWSP 332 UP 60LI 16TER+ 400 l 4.2 m² WWSP 880 / WWSP 442E UP 80

Heat pump Volume Heat exchanger area Order code Loading pump M18

LA 11MSR 300 l 3.2 m² WWSP 332 UP 60

Heat pump Volume Heat exchanger area Order code Loading pump M18

LA 11ASR 300 l 3.2 m² WWSP 332 UP 60LA 16ASR 400 l 4.2 m² WWSP 880 / WWSP 442E UP 80

Heat pump Volume Heat exchanger area Order designation Loading pump M18

SI 5MER / SI 7MER / SI 9MER 300 l 3.2 m² WWSP 332 UP 60SI 11MER 300 l 3.2 m² WWSP 332 UP 80

Heat pump Volume Heat exchanger area Order code Loading pump M18

SI 30TER+ 1

1. Domestic hot water preparation is carried out using the additional heat exchanger with a maximum of 1 compressor.

400 l 4.2 m² WWSP 880 UP 32-70

SI 75TER+ 1 2 x 500 l 8.4 m² 2 x WWSP 880 6.5 m³/h

SI 75ZSR 2 x 500 l 8.4 m² 2 x WWSP 880 11.5 m³/h

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Appendix 11.5

11.5 Order form for (heating/cooling) heat pump start-up

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11.5

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