complete system for distribution and hygiene of potable...

Complete system for distribution and hygiene of potable water

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Valves, controls + systems

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Innovation + Quality

Wasserarmaturen_GB_2013_Wasserarmaturen 13.08.13 10:41 Seite 1

Content/SummaryStandards and regulations

Content

Page

2 Summary/Standards and regulatons3 Potential risks in potable water

systems/Design4 Complete system for potable water

distribution and hygiene/ System illust-ration

6 Thermostatic valve “Aquastrom VT”with presettable residual volume flowfor circulation pipes

7 Thermostatic valve “Aquastrom T plus”with presetting for circulation pipes

8 Double regulating and commissioningvalve “Aquastrom C”

9 Water sampling valve “Aquastrom P”/Implementation of the Decree for Pota-ble Water

10 “Aquastrom” Free-flow valves, FR andKFR valves made of bronze

11 Non-return check valve “Aquastrom R”with test vents/Ball valves for potablewater “Optibal TW”

12 Flush-mounted valves “Aquastrom”(UP)/”Aquastrom UP-F”, “AquastromUP-KFR” and circulation valves “Aqua-strom UP-Therm”

13 Water filters “Aquanova”/Backflush fil-ters “Aquanova”

14 “Regumaq X-30 / XZ-30” Stations forhot water preparation

15 “Regumaq XK” Cascade control setsfor hot water preparation”

16 Cold water circulation18 “DynaTemp CW-BS” Automatic bal-

ancing and thermal disinfection in potable water circulation pipes

19 Further products for potable watersystems

20 Service/Work support

Portable water -the most important product for mankind

Potable water is the most important productfor our nutrition. As it is subject to strictdirections and controls, each consumer issupplied with high quality water. However, behind the water meter, stagnantwater, old or oversized storage cylinders aswell as a badly isolated pipework supportthe development of noxious pathogenicgerms. The user is responsible for the observanceof all instructions!

The Decree for Potable Water attaches greatimportance to prevention. Settlement anddevelopment of micro-organisms have to beprevented by constructive measures duringdesign and realisation of an installation. Thespecifying engineer and installer must proveand are responsible that the system wasinstalled and put into operation according toapproved rules of technology. Valid rules,guidelines and regulations must be adheredto.

a sign of quality

Valves and controls for potable water instal-lations are subjected to strict directionswhich are defined in the DIN 1988 standard.The material must not impair the water qua-lity – not even long term. The emission of alloy-ing constituents of bronze is defined in the Ger-man Decree for Potable Water (TrinkwV).The Oventrop potable water system is madeof materials which meet these requirements.Especially bronze is used in many sectors.Bronze is a material combining many par-ticular characteristics and, amongst others,offers the following advantages:

- hygienically safe- corrosion resistant- non-ageing- temperature resistant- 100% recyclableThe millennium-old experience renders theuse of this material safe which is historicallyproven.

Free-flow valves and “KFR” valves“Aquastrom” made of bronze

Approvals

Bronze water wellSeen at the promenade in Düsseldorf

2


Potential risks in potable water systemsDesign

Potential risks in potable water systems

The living conditions for harmful micro-organisms must be rendered as hostile aspossible and bio films must be avoided inparticular. Cell masses of algae, bacteria andfungus together with iron and lime depositsform a bio film on inner pipe walls, in appli-ances and storage cylinders. Pathogenicgerms, as well as the dangerous legionella(illustr. 3), may multiply in these bio films. The formation of these bio films is suppor-ted by stagnating water and low flow veloci-ties. Temperatures between 30-45°C (sometimeseven lower temperatures) support the deve-lopment of microorga-nisms. An excessiveheat loss in the system caused by low flowvelocities or an insufficient insulation, deadpipe sections, temperature layers in hotwater storage cylinders, cold water which iswarmed up by adjoining hot water pipes –all this may support the increase of germs. Design

During design and construction of potablewater installations it must be ensured that- a sufficient flow in all parts of the system

is guaranteed- the water volume is as low as possible

and that the water is exchanged as oftenas possible

- the hot water temperature does not dropbelow 57°C at the draw off points, notbelow 55°C at the end of the circulationpipe and that is does not exceed 25°C inadjoining cold water pipes (pipe insulati-on, water exchange!)

Design and calculation of a hygienically safepotable water installation according to theapproved rules of technology are based onthe following standards and directives:- DIN EN 806-3 (calculation of the inner

pipe diameter)- DIN 1988-300 (dimensioning of the pipe-

work for cold and hot potable water)- DVGW work sheets “W 551” and “W 553”

(dimensioning of the circulation pipes)- VDI 6023 (hygienically safe design, reali-

sation, operation and maintenance ofpotable water installations)

- Decree for Potable Water (decree regar-ding the quality of water for human con-sumption)

1 Pote ntial risks within an unbalanced potable water system (using the example of aresidential building)2 Increase of legionella in potable water3 Legionella

3

!

! !

!

Temperature lossdue to insufficientpipe insulation

Too low volumeflow in remoterisers

Warming up of adjoining cold water risers

Stagnation inunoccupieddwellings

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1

3

2

Increase of legionella in potable water

Application ° C Living conditions

optimum increase

no increase

slow die back

swift die back

slow increase

slow increase

Potable waterhot

Showerwater

Potable watercold

100

90

80

70

60

50

40

30

20

10

0

no increase(legionella sleep)


15

711

10

8

9

1213

11 6

23

4

Coldwate

1

3

4

1

2

3

4

1

2

5

4

optional:Cooling capacity via chiller

PW

C

PW

H-C

PW

H

PW

C-C

PWC-C

PWC


Complete system for potable water distribution and hygieneSystem illustration

16

14

6Coldwater

Flow sensor

BusCirc.

Hot water

17

15

Master

1. ”Aquastrom F“

2. Circulation regulating valve

3. ”Aquastrom UP-F“

4. ”Aquastrom K“

5. ”Aquastrom KF“

6. ”Aquastrom KFR“ + ”Aquastrom P“

7. ”Aquastrom F + Aquastrom P“

8. ”Optibal TW“

9. ”Optibal TW“ + „Aquastrom P“

10. ”Aquastrom R“

11. Flushing device

12. Domestic water station

13. Bypass isolating valve

14. Station for hot water preparation “Regumaq XZ”

15. Cascade control set “Regumaq XK”

16. Three-way diverting valve/ Electromotive actuator “Aktor M”

17. Buffer storage cylinder “Hydrocor HP”

7

5

Distribution system

The Oventrop distribution system includingcirculation prevents stagnation in hot waterinstallations.A new cold water circulation (see page 16)with the corresponding circulation regulatingvalves “Aquastrom K” serves to prevent sta-gnation in a cold water pipework. Warmingup of the cold water is reduced. Should thecold water temperature exceed the requiredtemperature due to system related factors,the cold water installation may be chilled.

Complete system for potable water installations

The Oventrop system for potable waterinstallations is a co-ordinated system comp-lying with the valid standards and theDecree for Potable Water. The components of the potable water instal-lation enable a technically perfect hot waterpreparation, an optimum potable water cir-culation with a correct flow and water sam-pling at the prescribed points of the potablewater installation. Last but not least, the used materials guarantee a hygienically safepotable water quality.

Hot water preparation

The “Regumaq” stations prepare the hotwater according to the continuous flow prin-ciple. The water is only heated when it isneeded, i.e. “just in time”.A potable water reserve is not necessaryand hygienically safe conditions are guaranteed.

PW

H

PWH-C

PWH


Thermostatic valve “Aquastrom VT” withpresettable residual volume flow for circulation pipes

The bronze valve “Aquastrom VT” is a thermostatic and hydronic regulating valve withpresetting for the residual volume flow inpotable water circulation pipes according toDVGW work sheets W 551/ W 553.The valve combines two functions:Thermal control:

Max. control range: 50°C up to 65°CRecommendedcontrol range: 55°C up to 60°CControl accuracy: ± 1°CDepending on the detected fluid temperature,the volume flow is adjusted in such a way that a presettable temperature (e.g.57°C) is maintained at a constant level.Additionally, the valve supports thermaldisinfection by a controlled increase orreduction of the residual volume flow. Hydronic balancing:

To ensure the required volume flow distribution in the circulation system, ahydronic balancing according to DVGWwork sheet W 553 has to be carried out.To meet the temperature requirements ineach riser of the circulation system, theresidual volume flow can be set at the“Aquastrom VT” in each circulation riserirrespective of the set temperature. Thevalve has 6 different presetting positions.The factory setting 6 (DN 15 kv 0.1, DN 20kv 0.3) complies with the specifications ofthe test standard W 554.The “Aquastrom VT” is equipped with anisolating ball valve with back chamberalways filled with water, without deadzone and a thermometer for the control ofthe water temperature in the circulationriser. Moreover, the integration into an existing centralised building control system ispossible with the help of a sensor elementPT 1000 (accessory, item no. 420 55 92).The valve is lead lockable and is suppliedwith insulation shells (fire protection classB1).The valve is DVGW, KIWA, SVGW, WRASand VA certified.1,2 “Aquastrom VT” with adjustable hand-wheel for temperature and residual volumeflow, temperature indicator and insulation(extent of supply)3 System illustrationCirculation system with thermostatic valveswith presettable residual volume flow“Aquastrom VT” and double regulating andcommissioning valves “Aquastrom C” tosecure the required volume flow4 Functional scheme and characteristiclines “Aquastrom VT” during operating anddisinfection phase

1 2

6

4

3

PWC

Adjustable control range50 °C - 65 °C

Factory range57 °C

Disinfectionrange > 70 °C

DN kv (m3/h)15 0.03 - 0,120 0,1 - 0,3 6 different presetting positions

Volu

me

flow

(l/h

)

Dis

infa

ctio

n vo

lum

e flo

w

Having reached the setnominal temperature, thevalve limits the volumeflow to a residual volumeflow.

Valve opens about6°C after having reached the minimumresidual volume flow.

Having reached thedisinfection tempera-ture, the valve limits tothe residual volumeflow again.

Variable residualvolume flow

Portable water (°C)

PWH-C

PWH


7

Thermostatic valve “Aquastrom T plus” withpresetting for circulation pipes

The thermostatic valve “Aquastrom T plus”is preset at works to 57°C and can in mostcases be operated without any additionalsettings. Different circulation temperaturesmay, if necessary, be set within a controlrange of 40°C to 65°C. However, a controlrange of 55°C to 60°C is recommended.Once the temperature exceeds this preset-ting, the volume flow is limited to a fixedresidual volume flow according to W 554.Thermal disinfection(anti-legionella function)

In general thermal disinfection is initiated byraising the temperature of the potable waterto above 70°C within the complete system.At approximately 6°C above the temperatureset on the “Aquastrom T plus”, the residualvolume flow is increased to the disinfectionvolume flow. As the temperature continuesto increase to approx. 73°C, the volume flowis throttled again to the residual volume flow.This way, the hydronic balance is also main-tained during the disinfection phase. The preset value may even be read off withthe lockshield cap mounted. Limitation of the volume flow/regulation of risers

The thermostatic valve “Aquastrom T plus”works automatically. The maximum flow canbe limited with the help of a double regula-ting and commissioning valve in the lastriser. The limit stop of the presetting is kepteven if the double regulating and commis-sioning valve is closed for maintenancework. After having removed the thermometer,the isolated riser can easily be drained using the integrated drain valve with hose connection.Models:

The bronze thermostatic valve “Aquastrom Tplus” for circulation pipes is available in sizeDN 15/DN 20/ DN 25 with female or malethreaded connection on both ports. Thevalve has no dead zone and complies toDVGW W 554.- Fire protection class B 1- Thermal conductivity = 0.04 W/m.K- Max. temperature 90°CThe valve is DVGW, KIWA, SVGW, WRASand ACS certified.

1 The “Aquastrom T plus” is supplied com-plete with insulation (insulation = packaging)

2 “Aquastrom T plus” with sensor elementPT 1000 for temperature control via centrali-sed building control systems (accessories,item no. 420 55 92)3 System illustrationCirculation system with thermostatic valvesfor circulation pipes “Aquastrom T plus” anddouble regulating and commissioning valves“Aquastrom C” to ensure the necessarywater flow in the last riser4 Characteristic lines of temperature setting

1 2

4

Volu

me

flow

(l/h

)

Portable water (°C)

Adjustable control range40 °C–65 °C

Dis

infa

ctio

n vo

lum

e flo

w

Having reached the setnominal temperature, thevalve limits the volume flowto a residual volume flow.

Valve opens about6°C after having reached the minimumresidual volume flow.

From approx. 73°Conwards, the valvelimits to the residualvolume flow again.

Recommended control range55 °C–60 °C

Disinfectionrange > 70 °C

Res

idua

l vol

ume

flow

acc

ordi

ng V

P 5

54

3

PWC

PWH-C

PWH


8

Double regulating and commissioning valve “Aquastrom C”

Oventrop double regulating and commis-sioning valves “Aquastrom C” are installedin the circulation pipes of potable watersystems and serve to achieve a hydronicbalance between the various circuits.The volume flows to be set at the “Aqua-strom C” result from the calculation accor-ding to DVGW work sheet W 553.The balance is achieved by a reproduciblepresetting. The valve is installed in the circulation risers.When installing the thermostatic valves“Aquastrom VT” in the individual circulationrisers, the double regulating and com-missioning valve “Aquastrom C” should beinstalled in the furthest and thus hydrauli-cally underprivileged risers. This is forsafety reasons if the required temperatureat the circulation point is not achieved andneeds readjusting according to DVGWwork sheet W 553.The valve body is made of bronze; thestem and disc are made of brass resistantto dezincification (DZR).Advantages:- precise presetting of even very low volu-

me flows- simple installation and easy operation- only one valve for five functions:

presettingisolationtemperature indication (20°C-100°C)drainingmeasuring (pressure test points seeaccessories)

- without dead zone- DVGW, SVGW, KIWA and ASC certifiedModels:Pressure range PN 10 for potable water upto 95°C.Male threaded model:item no. 420 71 04 – 10Female threaded model:item no. 420 81 04 – 101 “Aquastrom C”Female and male threaded model2 System illustrationBalancing of a circulation system with static double regulating and commissioningvalves “Aquastrom C”. Calculation of thecirculation pipe according to the DVGWwork sheet W 5533 The “Aquastrom C” is supplied completewith insulation (insulation = packaging)- Fire protection class B 1- Thermal conductivity = 0.04 W/m.K- Max. temperature 90°C4 Installation example

1

3 4

2

PWC

PWH-C

PWH


Water sampling valve “Aquastrom P”Implementation of the Decree for Potable Water

9

P

TWW/PWH

PWC

PWH-C

Water sampling location

P

P

PP

P

PWH

1

2

4

3

Implementation of the Decree for PotableWater

The Decree for Potable Water includes theobligation to examine the potable water forlegionella. The operator of a public potablewater installation or a large commercialinstallation in which aerosol develops (deve-lopment of vapour) has to have the installa-tion inspected at regular intervals (§ 14,paragraph 3). Almost all rented flats in multiple dwellings are subject to thisinspection duty. According to the DVGW work sheet W 551,large installations are defined as follows:- Installations with a hot water storage

cylinder content of more than 400 litresand/or

- Installations with a pipework content ofmore than 3 litres from the hot water prepa-ration to the draw off point

The Decree for Potable Water refers to theDVGW work sheet W 551 which prescribesthe following sampling points for an initialexamination:- one sampling point at the exit of the hot

water preparation- one sampling point at the re-entry of the

circulation pipe- one sampling point at the end of each

riser (e.g. tap at the hand wash basin)- if required, an additional sampling point

should be installed at the cold water entrypoint of the building

The water samples in the building can betaken at the usual draw off points. Watersampling valves are installed at the entryand exit of the hot water preparation. There-fore the requirements of the Decree forPotable Water with regard to the initial legio-nella examination are met by installing threewater sampling valves. Oventrop offers the water sampling valve“Aquastrom P” sized G 1/4 and G 3/8 toexamine the potable water for germs andbacteria. The valve body is made of bronzeand the discharge elbow of stainless steel.The valve with metal to metal seal is flameresistant and can thus be disinfected. AllOventrop free-flow, KFR and FR valves aswell as ball valves and double regulating andcommissioning valves for potable water canbe equipped with water sampling valves.For further questions regarding water sam-pling points and water sampling, pleasecontact your local Public Health Authorities. 1 Water sampling points for initial examinati-on according to DVGW work sheet W 551,cold water sampling point recommended bythe Federal Environment Office. 2 Flame resistant water sampling valve“Aquastrom P” for hygienic-microbiologicexamination according to DVGW W 551,Decree for Potable Water and VDI 6023.3 Bronze double regulating and commissio-ning valve “Aquastrom C” with thermometerand insulation with “Aquastrom P”.4 Bronze valve “Aquastrom KFR” as combi-nation free-flow valve with non-return checkvalve and water sampling valve “AquastromP”.


10

“Aquastrom”Free-flow valves, FR and KFR valves made of bronze

3 4

1 2

5

6

The free-flow valves as well as the FR andKFR valves “Aquastrom” are used in potablewater installations according to DIN 1988.The free-flow valve (F) serves to isolatewater pipes.The FR valve is additionally equipped with anon-return check valve with a low openingpressure. These valves which open if a pres-sure of 10 mbar is exceeded are especiallysuitable for use in circulation systems toprevent gravity circulation. The bonnet of the KFR valve features anintegrated non-return function and can bereplaced for maintenance purpose or beexchanged for a free-flow bonnet and viceversa without dismounting the pipe. Theflow-supporting model is especially silent(sound absorbing as per DIN EN ISO 3822standard, product group I).All functioning components are located onthe handwheel side. As a result, the installedvalves are easily accessible and allow aneasy operation.The used materials are recyclable. Bronzecan be melted down and be remanufactu-red. The composition of the plastic (polyami-de) is indicated on the inside of the hand-wheel. Advantages:- easy operation due to the location of the

test and draining orifice on the handwheelside

- valve and couplings made of corrosion-resistant bronze

- DVGW certified- maintenance-free stem seal- non-rising stem (on size DN 25 and above)- size DN 65 and above: stroke index inte-

grated in the handwheel, i.e. good opticaldisplay of the valve position if pipe guiding is unfavourable

- low height- FR valves with low opening pressure

(Popen. ≥ 10 mbar)- bonnet can subsequently be replaced,

conversion of KFR valve to free-flow valveand vice versa is possible

- valves very silent in operation, soundinsulation tested

- suitable up to PN 16Models:- both ports female thread according to EN

10226- both ports solder connection- both ports press connection- both ports male thread according to DIN

ISO 228- size DN 65 and above both ports male

thread or flanged- all models available with and without drai-

ning facilityAwards:

Design Award Switzerland

1 KFR and free-flow valves “Aquastrom”both ports with female or male threador solder connection2 KFR and free-flow valves “Aquastrom”both ports with press connection3,4 KFR and free-flow valves “Aquastrom” inlarge dimensions (DN 65-80)Models: Male thread according to DIN ISO228 and round flanges according to DIN EN 10925 Installation example6 System illustration

PWC

PWH


11

Non-return check valve “Aquastrom R” with test ventsBall valves for potable water “Optibal TW”

4

1 2

3

5

6

1,2 Bronze non-return check valve “Aqua-strom R” with test orifices according to DINEN 13959, type EA. Due to low openingpressure (Popen. ≥ 10 mbar) also suitablefor circulation pipes, without dead zone.

Plastic parts DVGW and SVGW certified.

3 System illustration

4,5 Ball valves for potable water “OptibalTW” made of bronze, with full flow (DN 15-80) according to DIN EN 13828, pluggeddraining orifices on both sides, without deadzone.

Also available with press connection for thedirect connection of copper pipe accordingto EN 1057 and stainless steel pipes “Niro-San”. DVGW certified.


PWC

PWH-C

PWH

PW

C

PW

H-C

PW

H


12

Flush-mounted valves “Aquastrom” (UP)“Aquastrom UP-F”, “Aquastrom UP-KFR”

and circulation valves “Aquastrom UP-Therm”

1

3

2

The flush-mounted valves “Aquastrom” (UP)are used in potable water installations.The valves are suitable for multi-storeyinstallation in cold, hot and circulation pipesfor- isolation- protection with integrated non-return function- regulationModels:- Flush-mounted F valves “Aquastrom UP-F”

Application: Potable water installationsPN 16, max. water temperature 90°C

- Flush-mounted KFR valves “AquastromUP-KFR”Application: Potable water installationsPN 16, max. water temperature 90°C

- Flush-mounted circulation valves“Aquastrom UP-Therm)Application: Potable water installationsPN 10 for circulation pipes according towork sheets W 551 and W 553

All models are available with:- both ports female thread according to EN

10226-1- both ports male thread according to DIN

ISO 228- both ports press connection system

Sanha, Geberit, ViegaColoured marking of the bonnets:

red hot watergreen cold waterviolet hot water circulation

Due to their modular construction, the val-ves can be used for intermediate ceilinginstallation or under plaster. Front-wallinstallation is possible with the help of amounting set which is available as acces-sory. The Oventrop flush-mounted valves distin-guish themselves by their valve body for universal application. Interchangeable valveinserts allow an easy conversion of free-flowvalves to KFR or circulation valves.The flush-mounted valves are available witha chrome-plated standard handwheel orwith a lockshield bonnet for use in publicbuildings. The chrome-plated protection capprevents tampering. The valve can only beset with the help of a socket spanner (size 6)included in the delivery.Advantages:- all components in contact with the fluid

are made of bronze- without dead zone- non-rising stem- the low hysteresis of the circulation

modules induces a high sensitivity to tem-perature changes

- circulation module with isolating facility- suitable up to PN 16- DVGW certified1 Flush-mounted valves “Aquastrom UP” forintermediate ceiling installation or under pla-ster, as lockshield model and circulationvalve (UP-Therm) with isolating facility

2 Flush-mounted circulation valve “Aqua-strom UP-Therm” for intermediate ceilinginstallation as thermal circulation regulatingvalve with isolating facility for the hydronicbalancing in potable water circulationsystems with floor to floor distribution3 System illustration Flush-mounted valves “Aquastrom”

PWH-C

PWH


13

Water filters “Aquanova”Backflush filters “Aquanova”

5

3

4

1

2

7 6

On its way from the waterworks to the con-sumer, the potable water may be polluted bydirt particles which could lead to malfunc-tions of valves, shower heads, dishwashers,water heaters etc. as well as corrosion with-in domestic installations.According to DIN 1988, the Oventrop waterand backflush filters “Aquanova” secure thepotable water quality and possible malfunc-tions within the domestic installation areavoided.The Oventrop water filters “Aquanova” areequipped with a replaceable filter insert. Theused materials are hygienically safe andcomply with the Decree for Potable Water.The filters without dead zone are DVGW andACS certified and protected by patent.Models:- Water filter “Aquanova Compact” with

female and male thread- Water filter “Aquanova Compact E” with

swivel connection piece for horizontal andvertical installation

- Water filter “Aquanova Magnum” withfemale and male thread

Award for “Aquanova Compact”:

Design Award Switzerland

The Oventrop backflush filters “Aquanova”are used in potable water installationsaccording to DIN 1988. Maintenance is car-ried out by backflushing the filter insert(handwheel has to be turned several times).The used materials are hygienically safe andcomply with the Decree for Potable Water.The backflush filters are DVGW certified andprotected by patent.Models:- Backflush filter “Aquanova Compact R”

with male thread- Backflush filter “Aquanova Compact RE”

with swivel connection piece for horizontaland vertical installation

- Backflush filter “Aquanova Meta R” withfemale or male thread with pressure gauges

The filter surface of the “Aquanova CompactRE + R” is drawn inwards. The contaminationcan be easily assessed with the help of thetransparent plastic filter cup (Trogamit T).The construction of the filters is protectedby patent. The backflush filters “Aquanova Meta R”have a brass filter cup.1 System illustration2 Water filter “Aquanova Compact”3 Water filter “Aquanova Magnum”4 Water filter “Aquanova Compact E”5 Backflush filter “Aquanova Compact R”6 Backflush filter “Aquanova Meta R”7 Domestic water station – compact unitwith backflush filter, pressure reducer, pres-sure gauge and male threaded connection.For vertical and horizontal installation. Clea-ning is carried out by backflushing the filterinsert. DVGW certified, without dead zone.

PWC


14

4

1 2

3

“Regumaq X-30”

The Oventrop “Regumaq X-30” stations areelectronically controlled product assemblieswith heat exchanger for the hygienic heatingof potable water on the flow principle. Thepotable water is only heated when it is needed,i.e.“just in time”. A potable water reserve isthus not necessary.

This product assembly allows an optimumrealization of regenerative pipework concepts:

The station is especially suitable for detachedand semi-detached houses. It is connected to buffer storage cylinders which are heatedup by solar energy, solid fuels, oil or gas.

PN 10 (at 20°C) up to 120°C

Depending on the temperature and the flowvolume on the potable water side (secondarycircuit), the circulation pump on the bufferside (primary circuit) is speed regulated. Theplate heat exchanger can be flushed usingthe fill and drain cocks integrated in the pri-mary and secondary circuit. Due to the turbu-lent flow, a good self-cleaning effect avoidinga contamination is achieved.

The potable water circuit is protected by a 10bar safety valve.

The components of the heat exchangersystem have flat sealing connections, are pre-assembled on a mounting board and leaktested.

“Regumaq XZ-30”The Oventrop station “Regumaq XZ-30” forhot water preparation is identical to the station“Regumaq X-30” but the product assemblyfor the operation of circulation systems isadditionally equipped with a circulation pumpin the potable water circuit. For this reason,the station is especially suitable for largesystems.

The controller is wired with the internal com-ponents and serves to control the followingcirculation functions:

- Operating mode “demand”: The circulationpump is activated if water is drawn off for abrief period

- Operating mode “cycle”: The circulationpump runs according to the set runningand rest periods

- Operating mode “on”: The circulationpump runs permanently

- Operating mode “off”: The circulationpump is switched off

- The operating time can optionally be deter-mined depending on the return temperature

- Three switching points within the corre-sponding operating mode can be program-med each day

1 Station “Regumaq X-30” for hot water pre-paration with electronic controller

2 Station “Regumaq XZ-30” for hot water pre-paration with electronic controller and additio-nal potable water circulation

3 System illustration “Regumaq X-30”

4 Draw off capacities (Q secondary) of the“Regumaq” station depending on the bufferstorage cylinder temperature

Example:If a required temperature of 60°C is set at thecontroller, a draw off volume of 30 l/min. (Qsecondary) can be reached with a water tem-perature of 75°C inside the buffer storagecylinder and a volume flow of 27 l/min. in thebuffer circuit.

The primary volume flow is modified by thepump in the storage cylinder circuit which isactivated by the controller.

1 Supply from storage cylinder2 Return to storage cylinder3 Hot water supply4 Cold water supply

Storagecylinder

2 1

3 4

“Regumaq X-30 / XZ-30”Stations for hot water preparation

Flow quantity, heating of potable water from 10°C to 60°C

Q p

rim

ary

(l/

min

)

Q secondary (l/min)

85 °C

30

25

20

15

10

5

0

65 °C 70 °C 75 °C 80 °C

2010 30

PWC

PWH


15

“Regumaq XK”Cascade control sets for hot water preparation

1

5

7

9

1213

11 6

23

4

Coldwater

Flow sensor

BusCirc.

Hot water

1

3

4

1

2

3

4

1

2

Master








8. ”Optibal TW“



11. Flushing device







2

Cascade control set “Regumaq XK”consisting of:Cascade control and actuators with ballvalves for potable water supply.The cascade control set allows to increase thedischarge capacity of the “Regumaq XZ-30” stations up to 120 l/min.

Models:- Set for the control of 2 “Regumaq XZ-30”

stationsDischarge capacity: 60 l/min. with a hotpotable water temperature of 60°C and acold water temperature of 10°C1 actuator with ball valve

- Set for the control of 3 “Regumaq XZ-30”stationsDischarge capacity: 90 l/min with a hot pota-ble water temperature of 60°C and a coldwater temperature of 10°C 2 actuators with ball valve

- Set for the control of 4 “Regumaq XZ-30”stationsMax. discharge capacity: 120 l/min. with ahot potable water temperature of 60°C anda cold water temperature of 10°C3 actuators with ball valve

1 “Regumaq XZ-30” with “Regumaq XK”


PWC

PWH-C

PWH


16

Cold water circulation

“Aquastrom K“

Chart

A circulation of cold water contributes tohygiene in the system. Stagnation is avoidedand the warming up of water is reduced, therequired maximum temperature of 25°C mightbe maintained by circulation only. If required,further measures (like cooling or flushing) canbe taken.

In general, the cold potable water is not war-med up in the cellar and only slightly in floorlevels as the ambient temperature at theselocations lies below the required temperatureof 25°C (cellar 15°C, storey 21°C). Cold wateris warmed up in the technical centre (tempe-ratures up to 30°C) and in the riser shaftwhere the cold water pipe is often laid next toheating, hot water and circulation pipes (tem-peratures of more than 30°C). Stagnatingwater warms up within a few hours, even ifthe insulation complies with the standards.

Chart: Warming up of potable water in thepipework during stagnation, fluid 15°C, insu-lation 100%

A cold water circulation prevents warming upof partitions. The energy produced duringwarming up spreads into the completesystem. Each time water is drawn off some-where in the system, cold water is supplied tothe system again which is not only of benefitto parts of the system but to the completeinstallation. In cellar pipes, heat is emittedagain by the water.

For hygienic reasons, potable water shouldnot stagnate and not reach/leave certain tem-perature ranges. In hot potable watersystems, this is ensured through the circulati-on. Germs and micro-organisms may, howe-ver, develop in cold water systems too. A cir-culation which prevents stagnation and keepsthe temperature below 25°C may also beinstalled in cold water systems but with lowconsumption, the cold circulation water mighthave to be chilled. The system is flushed ifnot used (according to VDI 6023 for morethan 3 days). Depending on the conditions inthe system, the potable water hygiene is gua-ranteed by combining 2 or 3 measures.

- circulation- cooling- flushing“Aquastrom K”Thermostatic cold water regulating valve“Aquastrom K” for thermal balance of coldwater circulation pipes. The valve features anisolating facility. If the valve is open, a mini-mum flow is guaranteed. If the set temperatu-re is exceeded, the valve opens up to a largerflow rate. Using the accessories of the “Aqua-strom UP” product range, the valve can alsobe used for flush-mounting installation or indry-build systems.

kv min = 0.05Temperature range: 6°C – 18°C

Potable water temperature [°C]

Ambient temperature: 30°C15x1

18x1

22x1

28x1.5

35x1.5

42x2

54x2

Time (hours)

Limiting temperature: 25°C

System illustration

“Aquastrom K“


17

3

7

TW W (PW H )

TW Z (PW H -C )

TW K (PW C )

TW KZ (PW C -C )

5

7

9

1213

11 6

23

4

Coldwater

Flow sensor

BusCirc.

Hot water

1

3

4

1

2

3

4

1

2

Master








8. ”Optibal TW“



11. Flushing device







Cooling

If the cold water reaches the maximum permissible temperature, it is cooled downwith the help of a chiller and a heat exchanger.As the temperature difference between thefluid and the surroundings is much lower incold water systems than in hot watersystems, less energy is required for cooling.

Flushing

A cold water system with circulation can beflushed quite easily. Depending on the pipelengths, the fresh water which is added tothe system distributes quite evenly. Flushing(primary flushing operation) is carried out ata central location (not at each riser) of thecirculation system. The valves have to beflushed, too (secondary flushing operation).

In housing construction (circulation does notreach the storey), the individual dwelling hasto be flushed when it is unoccupied as it isquite unlikely that the complete building isunoccupied.

Example of the application:

Installation of a potable water system withcold water circulation in a retirement homewith 60 rooms. If required, the circulatingcold water is cooled down via a chiller withheat exchanger. A cold water circulationvalve “Aquastrom K” is installed at the entryof each system. The pipework is insulatedaccording to DIN 1988-200.

The cooling capacity is only needed temporarily as the temperature is maintainedat the required level by the normal drain offoperations. Essentially, cooling is only carriedout overnight. In this pipework with a coldwater and circulation pipe of 1500 m, an average cooling capacity of 1 Watt per pipemeter is required. The required cooling capacitythus amounts to 1.5 kW. The required coolingenergy amounts to about 9 kWh per day.

Legend:

PWHPWH-CPWCPWC-C

Cold water circulation

PW

C-C

PW

C

optional:

Cooling capacity

via chiller


18

“DynaTemp CW-BS”Automatic balancing and

thermal disinfection in potable water circulation pipes

21

GLT

Internet

FMPLUS

WLAN

DDC “CW-BS“ DDC “CW-BS“

3

Management level/Automation level

Room level

1

* Integration into a centralised building control system of other manufacturers (e.g. HoneywellKieback & Peter, Sauter, Siemens, etc.) via the standardized interface “BACnet IP”.

1

2

2

3

4

8

7

6 6 2

9

5

45

“DynaTemp CW-BS” is a bus basedsystem for automatic thermal balancingand thermal disinfection in potable watercirculation systems according to DVGWwork sheets W 551 and W 553.The regulating valves “Aquastrom DT” withelectromotive actuators are connected tothe C-bus via the bus application fieldmodules. The integrated web server allows accessto the system via a PC and a standard webbrowser. Settings of the installation para-meters (e.g. time profiles) and queries ofseparation data, current status and disin-fection records can be carried out via themenu. An external 24 V transformer should beused for the power supply.The installation hydraulics which governsthe maintenance of an adequate potablewater circulation temperature (according toDVGW 57°C) is optimized by the stations.Temperature detection is carried out by theOventrop valve “Aquastrom DT” for pota-ble water circulation systems. The sensortemperatures are transmitted to the controlunits via the bus based field module andthe control demands for the “AquastromDT” are transmitted to the actuators by the“DynaTemp CW-BS” via the field module.Thermal disinfection is also controlled viathe control unit. The latter transmits a start-ing signal to the boiler control; the potablewater temperature is increased and thermaldisinfection of the risers of the circula-tion installation is carried out. The controlunit can be connected to the centralisedbuilding control system for monitoring andvisualisation purposes. Warning messagescan be transmitted via LAN, internet ormobiles.1 Control unit DDC “CW-BS” with bustechnology for the connection of C-busfield modules, surface mounting, operating/bus current: 24 V / 50 Hz2 Electromotive circulation valve “Aqua-strom DT” for electronic regulation of therequired residual volume flow in conjunctionwith the control unit DDC “CW-BS”, bronze, without dead zone, both portsmale thread according to DIN ISO 228, flatsealing, temperature sensor PT 1000,steady electromotive actuator 24 V (0-10 V), including draining valve for hoseconnection in front of the control unit, non-return check valve and insulation shellsmade of EPV according to the Decree forEnergy Saving, fire protection class B 1.Potable water installations PN 10Max. water temperature: 90°CNot illustrated – Field module “CW Plus”For the connection of sensors and pumpswith C-bus communication, surface moun-ting, 24 V/50 Hz3 System illustration “DynaTemp CW-BS”

Legend:

1 DDC “CW-BS” Control unit2 “Aquastrom DT” Regulating

valve including field module with actuator 24 V, 0-10 V, andtemperature sensor

3 “FM-CW Plus” Field modulefor the connection of sensorsand pumps

4 “Aquastrom FR”5 Temperature sensor G 1/46 “Aquastrom KFR”7 “Optibal TW” Ball valve for

potable water8 Circulation pump9 Storage cylinder temperature

sensor PT 1000


universaldesign

1 For small potable water circulationsystems with monovalent storage cylinder,e.g. in detached and semi-detached housesas well as for statically balanced circulationsystems with two risers, Oventrop offers thecompact station “Regucirc B”. The compactpump group with thermal insulation consistsof a circulation valve “Aquastrom VT” forpotable water pipes with control thermometer,a non-return check valve and an energy-saving high-efficiency pump (corresponds tothe energy efficiency class A rating for circu-lation pumps).

2 For potable water circulation systems withbivalent storage cylinder, e.g. in multipledwellings, Oventrop offers the compact station “Regucirc M”. The pump group withthermal insulation consists of a thermostaticmixing valve (35°C – 65°C) with fail-safe fun-ction, a non-return check valve and isolatingball valves with integrated thermometers forpotable water temperature control as well asan energy-saving high-efficiency pump (corresponds to the energy efficiency classA rating for heating circulation pumps).

3 Dwelling station “Regudis W” for local hotpotable water preparation

4 Thermostatic mixing valve “Brawa-Mix”made of bronze for an infinitely adjustablelimitation of the domestic water temperature,without dead zone. The valve features anintegrated fail-safe function, i.e. the hotwater supply is closed automatically if thecold water supply is interrupted. Award:

universal design award

5 Bypass isolating valve, DN 25, PN 10for use in potable water softening installationsfor industry, trade and domestic use.Body made of bronze. Without dead zone.Two valves allowing the isolation of the inletand outlet of the water softener, a bypasswith isolation facility, a valve for water sam-pling as well as a plugged orifice for theconnection of a drain valve are integrated inthe bypass isolating valve.

6 Bypass mixing valve DN 25 – DN 50, PN 10 for use in potable water softening instal-lations for industry, trade and domestic use.Body made of bronze. Without dead zone.Once it has been set, the bypass mixingvalve automatically maintains the hardnessof the mixed water irrespective of consump-tion and pressure variations. The bypassmixing valve is installed parallel to the watersoftener.

7 Example of a domestic potable waterinstallation

19

Further products for potable water systems

1

5

2

43

6

7


Pro

duc

t ran

ge 2

PR

246

-1/2

/7/2

013/

DD

Prin

ted

on

pap

er fr

ee fr

omch

lorin

e b

leac

hing

Service Work supports

OVENTROP GmbH & Co. KG Paul-Oventrop-Straße 1D-59939 OlsbergPhone +49 (0) 29 62 82-0Fax +49 (0) 29 62 82-450E-Mail [email protected] www.oventrop.de

1

3

2

1, 2 Screenshot of the current Oventrop pro-gramme “OVplan”.

3 Oventrop/Wilo calculation slide: “Hydronicbalancing of potable hot water circulationpipes” for a rapid, approximate design ofcirculation, regulating valves and pumps onsite.

Further information can be found in our cata-logue “Products” as well as on the internetunder product range 2.

Subject to technical modifications.

20


complete system for distribution and hygiene of potable...

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