operation manual - khűtős_rendszerek/1... · pdf filerefrigerant type r407c r407c r407c...

OPERATION MANUAL

EUWA15HDZW1EUWA20HDZW1EUWA25HDZW1EUWA30HDZW1EUWA35HDZW1

Packaged air-cooled water chillers

CONTENTS Page

Introduction ....................................................................................... 1Technical specifications ............................................................................. 1Electrical specifications ............................................................................. 2

Description ........................................................................................ 2Function of the main components.............................................................. 3Safety devices............................................................................................ 3Internal wiring - Parts table........................................................................ 4

Before operation................................................................................ 5Checks before initial start-up ..................................................................... 5Water supply.............................................................................................. 5Power supply connection and crankcase heating...................................... 5General recommendations ........................................................................ 5

Operation .......................................................................................... 6Digital controller ......................................................................................... 6Working with the unit ................................................................................. 6Advanced features of the digital controller................................................. 8

Troubleshooting ............................................................................... 13

Maintenance.................................................................................... 14Important information regarding the refrigerant used .............................. 14Maintenance activities ............................................................................. 14Disposal requirements ............................................................................. 14

INTRODUCTION

This operation manual concerns packaged air-cooled water chillersof the Daikin EUWA-HDZ series. These units are provided foroutdoor installation and used for cooling applications. The EUWAunits can be combined with Daikin fan coil units or air handling unitsfor air conditioning purposes. They can also be used for supplyingwater for process cooling.

This manual has been prepared to ensure adequate operation andmaintenance of the unit. It will tell you how to use the unit properlyand will provide help if problems occur. The unit is equipped withsafety devices, but they will not necessarily prevent all problemscaused by improper operation or inadequate maintenance.

In case of persisting problems contact your local Daikin dealer.

Technical specifications (1)

EUWA15HDZ EUWA30HDZEUWA20HDZ EUWA35HDZEUWA25HDZ

Packaged air-cooled water chillers Operation manual

READ THIS MANUAL ATTENTIVELY BEFORE STARTINGUP THE UNIT. DO NOT THROW IT AWAY. KEEP IT INYOUR FILES FOR FUTURE REFERENCE.

Before starting up the unit for the first time, make sure thatit has been properly installed. It is therefore necessary tocarefully read the installation manual supplied with the unitand the recommendations listed in "Checks before initialstart-up".

(1) Refer to the engineering data book for the complete list of specifications.

General EUWA 15 20 25

Nominal cooling capacity(a) (kw) 32.8 45.4 53.0

Nominal input(b) (kw) 12.7 17.0 21.2

Dimensions HxWxD (mm) 1535x1930 x700

1535x2575 x700

1535x2575 x700

Weight• machine weight (kg) 375 510 510• operation weight (kg) 380 516 516

Connections• water inlet FBSP 2” FBSP 2” FBSP 2”• water outlet FBSP 2” FBSP 2” FBSP 2”

Compressor

Model JT265DA-YE/JT140BF-YE

2xJT265DA-YE

2xJT335DA-YE

Speed 2900 2900 2900Oil type FVC68D FVC68D FVC68DOil charge volume (l) 2.7+1.5 2x 2.7 2x 2.7Crankcase heater (W) 50+33 2x 50 2x 50Refrigerant type R407C R407C R407CRefrigerant charge (kg) 5.3+3.2 2x 5.3 2x 4.7Evaporator

Model CB52-24H+ CB52-44H 2x CB52-44H 2x CB52-60H

Water volume (l) 2.1+1.1 2x 2.1 2x 2.8Water flow range (l/min) 56~180 76~240 96~300Condenser

Nominal air flow (m3/min) 170+80 2x 170 2x 170Fan motor output (W) 140+190+230 2x 190+2x 230 2x190+2x230

General EUWA 30 35

Nominal cooling capacity(a)

(a) The nominal cooling capacity is based on:- entering water temperature of 12°C- chilled water temperature of 7°C- ambient air temperature of 35°C

(kw) 68.1 79.5

Nominal input(b)

(b) The nominal input includes total input of the unit: compressor, fan motor and control circuit.

(kw) 25.5 31.8

Dimensions HxWxD (mm) 1535 x 3865 x 700 1535 x 3865 x 700Weight• machine weight (kg) 780 780• operation weight (kg) 789 789

Connections• water inlet FBSP 2-1/2” FBSP 2-1/2”• water outlet FBSP 2-1/2” FBSP 2-1/2”

Compressor

Model 3x JT265DA-YE 3x JT335DA-YESpeed 2900 2900Oil type FVC 68D FVC 68DOil charge volume (l) 3x 2.7 3x 2.7Crankcase heater (W) 3x 50 3x 50Refrigerant type R407C R407CRefrigerant charge (kg) 3x 5.6 3x 4.7Evaporator

Model 3x CB52-44H 3x CB52-60HWater volume (l) 3x 2.1 3x 2.8Water flow range (l/min) 114~360 114~450Condenser

Nominal air flow (m3/min) 3x 170 3x170Fan motor output (W) 3x 190 + 3x 230 3x 190 + 3x 230

Operation manual

1EUWA15~35HDZ

Packaged air-cooled water chillers4PW09730-1B

Electrical specifications (1)

DESCRIPTION

The EUWA packaged air-cooled water chillers are available in 4 standard sizes with nominal cooling capacities ranging from 31.0 to 79.5 kW.

Figure - Main components

Model EUWA 15 20 25 30 35

Power supply• Phase 3N~• Frequency (Hz) 50• Voltage (V) 400• Voltage tolerance (%) ±10• Recommended fuses 50 aM 50 aM 50 aM 80 aM 80 aM

Compressor• Phase 3~• Frequency (Hz) 50• Voltage (V) 400• Nominal running current (A) 6.6+13.1 2x 13.1 2x 15.0 3x 16.1 3x 15.0

Control and fan motor• Phase 1~• Frequency (Hz) 50• Voltage (V) 230• Nominal running current (A) 3.7 4.9 6.1 7.3 7.3

EUWA20, EUWA25

1 Air heat exchangers 8 Power supply intake

2 Compressors 9 Drain

3 Main switch box 10 Air purge

4 Sub switch box 11 Digital controller

5 Water heat exchangers 12 Low pressure gauge (suction pressure) (optional)

6 Water intlet connection 13 High pressure gauge (discharge pressure) (optional)

7 Water outlet connection

EUWA15~35HDZPackaged air-cooled water chillers4PW09730-1B

Operation manual

2

Function of the main components

Figure - Functional diagram

As the refrigerant circulates through the unit, changes in its state orcondition occur. These changes are caused by the following maincomponents:

■ CompressorThe compressor (M*C) acts as a pump and circulates therefrigerant in the refrigeration circuit. It compresses the refri-gerant vapour coming from the evaporator at the pressure atwhich it can easily be liquefied in the condenser.

■ CondenserThe function of the condenser is to change the state of therefrigerant from gaseous to liquid. The heat gained by the gas inthe evaporator is discharged through the condenser to theambient air, and the vapour condenses to liquid.

■ FilterThe filter installed behind the condenser removes small particlesfrom the refrigerant to prevent blockage of the tubes.

■ Expansion valveThe liquid refrigerant coming from the condenser enters theevaporator via an expansion valve. The expansion valve bringsthe liquid refrigerant to a pressure at which it can easily beevaporated in the evaporator.

■ EvaporatorThe main function of the evaporator is to take heat from thewater that flows through it. This is done by turning the liquidrefrigerant, coming from the condenser, into gaseousrefrigerant.

■ Water in/outlet connectionThe water inlet and outlet connection allow an easy connectionof the unit to the water circuit of the air handling unit or industrialequipment.

Safety devices

The unit is equipped with three kinds of safety device:

1 General safety devices: shut down all circuits and stop the wholeunit.

2 Circuit safety devices: shut down the circuit they protect, whilethe other circuits remain activated.

3 Part safety devices: shut down the part they protect.

■ Overcurrent relay (circuit safety devices)The overcurrent relays (K*S) are located in the switch boxes ofthe unit and protect the compressor motors in case of overload,phase failure or too low voltage. The relays are factory-set andmay not be adjusted. When activated, they must be resetmanually, followed by a reset of the controller.

■ High-pressure switch (circuit safety device)The high-pressure switches (S*HP) are installed on thedischarge pipes of the unit and measure the condenserpressure (pressure at the outlet of the compressor). When thepressure is too high, the pressure switches are activated. Thecircuit stops.When activated, they reset automatically, but the controllerneeds to be reset manually.

■ Low pressure safety (circuit safety device)When the suction pressure of a circuit is too low, the circuitcontroller shuts down the circuit. When the pressure returns tonormal, the safety device can be reset on the controller.

■ Reverse phase protector (general safety device)The reverse phase protector (R1P) is installed in the main switchbox of the unit. It prevents the compressors from running in thewrong direction. If the unit does not start, two phases of thepower supply must be inverted.

■ Discharge thermal protector (circuit safety device)The discharge thermal protectors (Q*D) are activated when thetemperature of the refrigerant leaving the compressor becomestoo high. When the temperature returns to normal, the protectorresets automatically, but the controller needs to be resetmanually.

S*HPM*C

p >S*LPp <

R7T

t >

R4Tt <

R5Tt <

R7T

t >

R4Tt <

R5Tt <

R6Tt <

EUWA15-20-25

EUWA30-35

Condenser

Distributor Filter Expansion valve

Evaporator

Water outlet

Waterinlet

Water outlet

Waterinlet

Compressor

Lowpressure switch

Highpressure switch

Operation manual

3EUWA15~35HDZ


■ Outlet water temperature sensors (circuit safety device)The outlet water temperature sensors (R4~6T) measure thetemperature of the water at the water heat exchanger outlet. Theprotection device shuts down the circuit when the temperature ofthe chilled water becomes too low in order to prevent freezing ofthe water during operation. When the outlet water temperature returns to normal, theprotector resets automatically.

■ Additional interlock contact (general safety device)To avoid that the unit could be started or run without watercirculating through the water heat exchanger, an interlockcontact (S10L) of e.g. a flow switch must be switched in thestart-up circuit of the unit.

■ Fan motor thermal protector (part safety devices)The condenser fan motors are equipped with thermal protectors(Q*F). The protectors are activated when the temperaturebecomes too high. When temperature returns to normal, theprotectors reset automatically.

Measuring devices

Checking the high and low pressure of the refrigerant circuit isnecessary to ensure the proper operation of the unit and toguarantee that the rated output will be obtained. The unit cantherefore be equipped with an optional high and low pressure gauge.Refer to "Switching the unit on" on page 6 for the acceptablepressures.

■ High pressure gaugeThe high pressure gauge indicates the discharge pressure(pressure at the outlet of the compressor).

■ Low pressure gaugeThe low pressure gauge indicates the suction pressure(pressure at the inlet of the compressor).

Internal wiring - Parts table

Refer to the internal wiring diagram supplied with the unit. Theabbreviations used are listed below:

C1~6 ......................Capacitors for fanmotors

E1,2,3H..................Crankcase heater

F1,2,3U ..................Fuses (field supply)

F5B ........................Fuse for primary of TR1

F6B ........................Fuse for secondary of TR1

F7B ........................Fuse for fan circuit + control circuit

H1P........................ Indication lamp alarm (field supply)

H2P........................ Indication lamp general operation (field supply)

H3,4,5P.................. Indication lamp operation of compressor (field supply)

J1,2 ........................Connector for analog input

J3,4,21 ...................Connector for digital input

J5,6,22,24 ..............Connector for digital output

J17 .........................Connector for power supply of controller

K1,2,3M..................Compressor contactor

K4,5,6S ..................Over current relay

K1,2,3A ..................Auxiliary relay for safety

K4A ........................Auxiliary relay for reverse phase protector

K12,13,14,15A .......Auxiliary relay for fan speed control

KP ..........................Pumpcontactor (field supply)

L1,L2,L3 .................Live

M11~32F................Fan motor

M1,2,3C .................compressor motor

N ............................Neutral

PE ..........................Main earth terminal

Q1,2,3D..................Discharge thermal protector

Q11~32F................Fan thermal protector

R1P........................Reverse phase protector

R3T ........................Sensor for ambient temperature measurement

R4,5,6T ..................Outlet water temperature sensor

R7T ........................Sensor for evaporator inlet water temperature measurement

S1,2,3HP................High pressure switch

S1,2,3LP ................Low pressure switch

S8S ........................Switch for dual setpoint (field supply)

S9S ........................Switch for remote start/stop (field supply)

S10L.......................Flowswitch (field supply)

S11L ......................Contact that closes if the pump is working (field supply)

S12S ......................Main isolator switch (field supply)

TR1 ........................Transfo 230 V ➞ 24 V (30 VA) for power supply of controllers

TR2 ........................Transfo 24 V ➞ 24 V (10 VA)

X*A,X*B.................. Interconnection connector switchbox 1, switchbox 2

X*A,X*C ................. Interconnection connector switchbox 1, switchbox 3

X*B,X*C ................. Interconnection connector switchbox 2, switchbox 3


Operation manual

4

BEFORE OPERATION

Checks before initial start-up

After the installation of the unit, check the following before switchingon the circuit breaker:

1 Field wiring

Make sure that the field wiring between the local supply paneland the unit has been carried out according to the instructionsdescribed in the installation manual, according to the wiringdiagrams and according to European and national regulations.

2 Additional interlock contact

An additional interlock contact S11L should be provided (e.g.flow switch, contact of pump motor contactor). Make sure that ithas been installed between the appropriate terminals (refer tothe wiring diagram supplied with the unit). S11L should be anormal open contact.

3 Fuses or protection devices

Check that the fuses or the locally installed protection devicesare of the size and type specified in the installation manual.Make sure that neither a fuse nor a protection device has beenbypassed.

4 Earth wiring

Make sure that the earth wires have been connected properlyand that the earth terminals are tightened.

5 Internal wiring

Visually check the switch boxes on loose connections ordamaged electrical components.

6 Fixation

Check that the unit is properly fixed, to avoid abnormal noisesand vibrations when starting up the unit.

7 Damaged equipment

Check the inside of the unit on damaged components orsqueezed pipes.

8 Refrigerant leak

Check the inside of the unit on refrigerant leakage. If there is arefrigerant leak, call your local Daikin dealer.

9 Oil leak

Check the compressor on oil leakage. If there is an oil leak, callyour local Daikin dealer.

10 Air inlet/outlet

Check that the air inlet and outlet of the unit is not obstructed bypaper sheets, cardboard, or any other material.

11 Power supply voltage

Check the power supply voltage on the local supply panel. Thevoltage should correspond to the voltage on the identificationlabel of the unit.

Water supply

Fill the water piping, taking into account the minimum water volumerequired by the unit. Refer to the "Installation manual".

Make sure that the water is of the quality as mentioned in theinstallation manual.

Purge the air at the high points of the system and check the operationof the circulation pump and the flow switch.

Power supply connection and crankcase heating

To switch on the crankcase heater proceed as follows:

1 Switch on the circuit breaker on the local supply panel. Makesure that the unit is “OFF”.

2 The crankcase heater is switched on automatically.

3 Check the supply voltage on the supply terminals L1, L2, L3, (N)by means of a voltmeter. The voltage should correspond to thevoltage indicated on the identification label of the unit. If thevoltmeter reads values which are not within the ranges specifiedin the technical data, check the field wiring and replace thesupply cables if necessary.

4 Check the LED on the reverse phase protector. If it lights up, thephase order is correct. If not, switch off the circuit breaker andcall a licensed electrician to connect the wires of the powersupply cable in the correct phase order.

After 6 hours, the unit is ready for operation.

General recommendations

Before switching on the unit, read following recommendations:

1 When the complete installation and all necessary settings havebeen carried out, close all front panels of the unit.

2 The service panels of the switch boxes may only be opened by alicensed electrician for maintenance purposes.

Make sure that the circuit breaker on the power supplypanel of the unit is switched off.

In order to avoid compressor damage, it is necessary toswitch on the crankcase heater for at least six hoursbefore starting the compressor after a long period ofstandstill.

Operation manual

5EUWA15~35HDZ


OPERATION

The EUWA units are equipped with a digital controller offering a user-friendly way to set up, use and maintain the unit.

This part of the manual has a task-oriented, modular structure. Apartfrom the first section, which gives a brief description of the controlleritself, each section or subsection deals with a specific task you canperform with the unit.

Digital controller

User interface

The digital controller consists of an alphanumeric display, labelledkeys which you can press, a number of LEDs indicating the selectedmenu and a hinged cover. When the cover is closed, only the mostfrequently used keys are accessible. menu and a hinged cover. Whenthe cover is closed, only the most frequently used keys areaccessible.

Figure - Digital controller

Keys accessible when the cover is closed:

Keys only accessible when the cover is open:

Connection to the unit

The digital controller is connected to the unit, more specifically to thecontroller PCB inside the unit, by means of a 6-ray cable and aconnector located on the rear side of the controller.

A cable length of up to 1000 metres between the digital controller andthe unit is allowed. This gives the opportunity to control the unit froma considerable distance. Refer to "Cable for digital controller" in theinstallation manual for cable specifications.

Figure - Rear side of the controller and its connector (1)

Working with the unit

This chapter deals with the everyday usage of the unit. Here, you willfind how to perform routine tasks, such as:

■ "Switching the unit on" on page 6 and "Switching the unit off" onpage 7,

■ "Consulting actual operational information" on page 7,

■ "Adjusting the temperature setpoint" on page 7,

■ "Resetting the unit" on page 7.

Switching the unit on

1 Press the J key on the controller.

Depending on the setting of the remote ON/OFF control parameter("User settings menu – z" on page 8), the following conditions mayoccur.

When the remote ON/OFF control parameter is set to NO, the LEDinside the J key lights up and an initialization cycle is started. Onceall the timers have reached zero, the unit starts up.

When the remote ON/OFF control parameter is set to YES, thefollowing table applies:

2 When the unit is started up for the first time, or when the unit hasbeen out of operation for a longer period, it is recommended togo through the following checklist.

• Abnormal noise and vibrationsMake sure that the unit does not produce abnormal noises orvibrations: check the fixations and piping. If the compressormakes abnormal noises, this may also be caused by anovercharge of refrigerant.

• Working pressureIt is important to check the high and low pressure of therefrigerant circuit to ensure the proper operation of the unitand to guarantee that the rated output will be obtained.For reference, the average saturated temperature of R407Cin relation to the pressure readout can be found in "Annex II"on page 15.

o key, to start up or to shut down the unit.

p key, to enter the safeties menu or to reset an alarm.

kkey, to scroll through the screens of a menu (only in caseW, X or C appears) or to raise, respectively lower asetting.

q key, to confirm a selection or a setting.

u key, to enter the readout menu.

s key, to enter the setpoints menu.

z key, to enter the user settings menu.

e key, to enter the timers menu.

r key, to enter the history menu.

t key, to enter the info menu.

y key, to enter the input/output status menu.

a key, to enter the user password menu.

i key, has no effect on EUWA units.

This key, allowing the selection of cooling or heatingoperation on EUWY units is provided on the EUWAcontroller but the EPROM on the controller PCB deniesany action since heating operation is impossible.

NOTE Temperature readout tolerance: ±1°C.

Legibility of the alphanumeric display may decrease indirect sunlight.

Local key Remote switch Unit o LED

ON ON ON ON

ON OFF OFF Flashing

OFF ON OFF OFF

OFF OFF OFF OFF

1


Operation manual

6

3 If the unit does not start after a few minutes, consult the readoutmenu which gives the status of the different circuits (refer toparagraph "Consulting actual operational information" onpage 7). Also refer to the chapter "Troubleshooting" on page 13.

Switching the unit off

If the remote on/off control parameter is set to No:

1 Press the o key on the controller.

The LED inside the o key goes out.

If the remote on/off control parameter is set to Yes:

1 Press the o key on the controller or switch the unit off using theremote on/off switch.

The LED inside the o key goes out in the first case and startsblinking in the second case.

Consulting actual operational information

1 Enter the readout menu using the u key.

The controller automatically shows the first screen of thereadout menu which provides the following information:• MANUAL/COOLING or COOLSETP1/2: automatic/manual control

mode and cooling operation. If the automatic control mode isselected, the controller will indicate the active temperaturesetpoint.

• INLET WATER: actual inlet water temperature.• AMBIENT: actual ambient temperature.• THERM. STEP: actual thermostat step.

2 Press the m key to enter the second screen of the readoutmenu.

The OUTLET WATER TEMP screen of the readout menu providesinformation concerning the outlet water temperature:• OUTL. WATER 1: actual outlet water temperature of circuit 1.• OUTL. WATER 2: actual outlet water temperature of circuit 2.• OUTL. WATER 3: actual outlet water temperature of circuit 3 (if

applicable).

3 Press the m key to enter the third screen of the readoutmenu.

The CIRCUITS STATUS screen of the readout menu providesinformation concerning the status of the different circuits.• C1: actual status of circuit 1.• C2: actual status of circuit 2.• C3: actual status of circuit 3 (if applicable).

When a circuit is ON, the following status information mayappear:

• COOLING: the circuit is cooling.When a circuit is OFF, the following status information mayappear:• SAFETY ACTIVE: one of the circuit safety devices is activated

(Refer to the chapter "Troubleshooting" on page 13). Thecontroller cannot indicate which safety is activated since allsafeties of a circuit are connected in series.

• FREEZE UP DIS: the circuit was shut down because the waterheat exchanger ran the risk of freezing up. The unit will

continue or start its normal operation automatically when thefreeze-up risk has disappeared.

• TIMERS BUSY: the actual value of one of the software timers isnot zero (refer to the "Timers menu – e" on page 8).

• CAN STARTUP: the circuit is ready to start up when extracooling load is needed.

4 Press the l key to return successively to the second and thefirst screen of the readout menu.

Adjusting the temperature setpoint

The unit provides definition and selection of two independenttemperature setpoints for cooling operation:

■ SETP. COOL 1: inlet water temperature, cooling setpoint 1,

■ SETP. COOL 2: inlet water temperature, cooling setpoint 2.

The selection between setpoint 1 and 2 is done by a remote dualsetpoint switch (to be installed by the customer). The actual activesetpoint can be consulted in the readout menu.

If the manual control mode is selected (refer to the "User settingsmenu – z" on page 8), none of the above-mentioned setpoints willbe active.

To adjust a setpoint, proceed as follows:

1 Enter the setpoints menu using the s key.

If the user password is disabled for setpoint modifications (referto the "User settings menu – z" on page 8), the controller willimmediately enter the setpoints menu.If the user password is enabled for setpoint modifications, enterthe correct code using the k key (refer to the "User passwordmenu – a" on page 9). Press q to confirm the password and toenter the setpoints menu.

2 Select the setpoint to be adjusted using the q key.

A setpoint is selected when the cursor is blinking behind thesetpoint's name.The ">" sign indicates the actual active temperature setpoint.

3 Press the k key to adjust the temperature setting.

The default, limit and step values for the cooling temperaturesetpoints are:

4 Press q to save the adjusted temperature setpoint or press thes key to cancel the modification.

When the setting has been confirmed, the cursor switches to thenext setpoint. When the setting has been cancelled, the cursorreturns to the upper left corner of the screen.

5 To adjust other setpoints, repeat from instruction 2 onwards.

Resetting the unit

The units are equipped with two kinds of safety devices: unit safeties(reverse phase protector and flowswitch) and circuit safeties.

When a unit safety occurs, all compressors are shut down. Thesafeties menu will indicate that the reverse phase protector isactivated or that the flow has stopped (flowswitch activated). TheCIRCUITS STATUS screen of the readout menu will indicate OFF - SAFETYACTIVE for all circuits. The red LED inside the p key lights up and thebuzzer inside the controller is activated.

When a circuit safety occurs, the compressor of the correspondingcircuit is shut down. The CIRCUITS STATUS screen of the readout menuwill indicate OFF - SAFETY ACTIVE for the circuit concerned. The redLED inside the p key lights up and the buzzer inside the controller isactivated.

The pressures measured will vary between a maximumand minimum value, depending on the water and outdoortemperatures (at the moment of measurement).

Minimum Nominal Maximum

( –5°C DB) ( 35°C DB) ( 38°C DB)

(LW 4°C) (LW 7°C) (LW 16°C)

Low pressure 3 bar 4 bar 6.5 bar

High pressure 7 bar 21 bar 24 bar

outdoor temperature LW leaving water temperature

SETP. COOL default value +12.0°C

limit values(a)

(a) For glycol units, the lower limit of the cooling temperature setpoint can be adapted in the factory to 5°C, 3°C, –2°C, –7°C.

+7.0 to +25.0°C

step value 0.1°C

Operation manual

7EUWA15~35HDZ


If the unit has been shut down due to a power failure, it will carry outan autoreset and restart automatically when the electrical power isrestored.

To reset the unit, proceed as follows:

1 Press the p key to acknowledge the alarm.

The buzzer is deactivated.The controller automatically switches to the correspondingscreen of the safeties menu: unit safety or circuit safety.

2 Find the cause of shutdown and correct.

Refer to "Listing activated safeties and checking the unit status"on page 11 and "Troubleshooting" on page 13.When a safety can be reset, the LED under the p key startsblinking.

3 Press the p key to reset the safeties that are no longer active.

Once all safety devices are disactivated and reset, the LEDunder the p key goes out. If one of the safeties is still active, theLED under the p key goes on again. In this case, return toinstruction 2.

4 If a unit safety occurred or if all circuits were shut down due tocircuit safeties, switch on the unit using the o key.

Advanced features of the digital controller

This chapter gives an overview and a brief functional description ofthe screens provided by the different menus. In the following chapter,you will find how you can set up and configure the unit using thevarious menu functions.

All menus are directly accessible using the corresponding key on thedigital controller. The down arrow X on the display indicates that youcan go to the next screen of the current menu using the m key. Theup arrow W on the display indicates that you can go to the previousscreen of the current menu using the l key. If C is displayed, thisindicates that you can either return to the previous screen or can goto the next screen.

Readout menu – u

The controller automatically enters the "readout menu" after startup.

It provides the following screens:

Setpoints menu – s

Depending upon the settings in the user settings menu, the"setpoints" menu can either be entered directly or by means of theuser password.

User settings menu – z

The "user settings" menu, protected by the user password, allows afull customization of the units.

Timers menu – e

Safeties menu – p

The "safeties" menu provides useful information for trouble shootingpurposes. The following screens contain basic information.

If the user shuts down the power supply in order to repair asafety, the safety will automatically be reset after power-up.

NOTE The history information, i.e. the number of times a unitsafety or a circuit safety occurred and the unit status atthe moment of shutdown, can be checked by means ofthe history menu.

To consult actual operational informa-tion about the control and operationmode, the inlet water and ambienttemperature and the thermostat step.

To consult information about the outletwater temperature of the differentcircuits.

To consult information about the circuitsstatus.

BX MANUAL / COOLING INLET WATER : + 18.0 °C AMBIENT : + 22.3 °CTHERM. STEP : 3 / 3

BC OUTLET WATER TEMPOUTL. WATER 1 : + 13.2 °COUTL. WATER 2 : + 12.5 °COUTL. WATER 3 : + 12.8 °C

BW CIRCUITS STATUSC1 : OFF - FREEZE UP DISC2 : ON - COOLINGC3 : OFF - SAFETY ACTIVE

To define and to select the temperaturesetpoint.

To activate or deactivate the remote on/off control.To indicate if a BMS card is installed ornot installed.

To define the manual settings and toactivate or de-activate manual controlmode.

To define the thermostat settings.

To define the BMS settings.This screen will only be displayed if theoptional BMS address card is installed.

To define the BMS board-settings. This screen will only be displayed if theoptional BMS addrescard is installed.

To define whether or not a password isneeded to change the temperaturesetpoint.

To calibrate the sensor for inlet watertemperature measurement.

To check the actual value of the generalsoftware timers.

To check the actual value of thecompressor timers.

To consult information about the unitsafety which caused the shutdown andto check the unit status at shutdown.

To check the status of circuit 1 atactivation of one of the circuits safeties.



B SETP. COOL 1 : +12.5 °C> SETP. COOL 2 : +18.0 °C

BX REMOTE CONTROLREMOTE ON/OFF :YBMS INSTALLED :N

BC MANUAL SETTINGS FANSPEED : MEDIUMC1 : ON C2 : OFF C3 : OFFPRESENT MODE : MANUAL

BC THERM. SETTINGSSTEPS : 2 STPL. : 0.8 °CSTEPDIFFERENCE : 0.5 °CLOADUP:000 s - DWN : 000 s

BC BMS - SETTINGSBMS CONTROL ALLOWED : YADDR.PCB : 01PROTOCOL : CAREL

BC BMS BOARDSETTINGSSERIAL BOARDS RS485BAUDRATE: 19200 bps

BC SETPOINT - PASSWORDPASSWORD NEEDED TOCHANGE SETPOINTS : Y

BW SENSOR ACCURACY

INLET WATER SENSOROFFSET : 0.0 °C

BX GENERAL TIMERSLOADUP : 000s - DWN : 000sFLOWSTART : 00sCOMPR. STARTED : 00s

BW COMPRESSOR TIMERSGRD 1 : 000s AREC 1 : 000sGRD2 : 000s AREC2 : 000sGRD3 : 000s AREC3 : 000s

BX UNIT SAFETYREVERSE PHASE PROT.INLET WATER : + 18.0 °CAMB. : +22.0 °C / COOLING

BC C1 SAFETYOUTL. WATER1 : +13.0 °CINLET WATER : +18.0 °CAMB. : +22.0 °C / COOLING

BC C2 SAFETYOUTL. WATER2 : +13.0 °CINLET WATER : +18.0 °CAMB. : +22.0 °C / COOLING

BW C3 SAFETYOUTL. WATER3 : +13.0 °CINLET WATER : +18.0 °CAMB. : +22.0 °C / COOLING


Operation manual

8

History menu – r

The "history" menu contains all the information concerning the latestshutdowns.

Info menu – t

Input/output menu – y

The "input/output" menu gives the status of all the digital inputs andthe relay outputs of the unit.

User password menu – a

Tasks of the user settings menu

Entering the user settings menu

The user settings menu is protected by the user password, a 4-digitnumber between 0000 and 9999.

1 Press the z key.

The controller will request the password.

2 Enter the correct password using the k key.

3 Press q to confirm the password and to enter the user settingsmenu.

The controller automatically enters the first screen of the usersettings menu.

Selecting local or remote on/off control

The remote on/off control parameter in combination with the remoteon/off switch (installed by the customer) allows the user to switch theunit on or off not using the o key on the controller.

If the remote on/off control parameter is set to Y (yes):

■ the unit will start up when the o key on the controller and theremote on/off key are both on (the o LED is on),

■ the unit will not start up when the o key on the controller is onbut the remote on/off switch is off (the o LED flashes),

■ the unit will not start up when the o key on the controller is off(the o LED is off).

If the remote on/off control parameter is set to N (no), the unit canonly be switched on or off using the o key on the controller.

To select local or remote on/off control, proceed as follows:

1 Enter the user settings menu.

If the controller is already in the user settings menu, position thecursor in the upper left corner of the actual screen using the zor q key and go to the REMOTE CONTROL screen using the kkey.

2 Position the cursor behind REMOTE ON/OFF using the q key.

3 Select Y or N using the k key.

4 Press q to confirm or press z to cancel the modification.

Installing BMS address card

The BMSCARD INSTALLED parameter in combination with address cards(optional PCB) allows the user to control the unit from a supervisorysystem.

If the BMSCARD INSTALLED parameter is set to Y (yes), communicationwith a supervisory system is possible. The BMS SETTINGS screen and

To consult the outlet water, inlet waterand ambient temperature limits.

To consult information about thenumber of shutdowns, the unit safetywhich caused the most recentshutdown and the unit status at thisshutdown.

To consult information about thenumber of circuit 1 shutdowns and thecircuit status at the most recentshutdown.



To consult additional information aboutthe unit such as the unit name, therefrigerant used and the manufacturingnumber.

To consult information about the con-troller's software version.

To check the status of the circuitsafeties.

To check the status of the flowswitch.

To check the status of the remotesetpoint selection switch, the remoteon/off switch and the reverse phaseprotector.

To check whether or not the differentcompressors are activated.

To check the status of the low pressurebypass switches.

To check the status of the fanspeedrelays.

B TEMPERATURE LIMITSOUTL. WATER : +04 +20 °CINLET WATER : +07 +27 °CAMB. TEMP. : -5 +43 °C

BX UNIT HISTORY : 002REVERSE PHASE PROT.INLET WATER : +18.0 °CAMB. : +22.0 °C / COOLING

BC C1 HISTORY : 001OUTL. WATER1 : +13.0 °CINLET WATER : +18.0 °CAMB. : +22.0 °C / COOLING

BC C2 HISTORY : 003OUTL. WATER2 : +13.0 °CINLET WATER : +18.0 °CAMB. : +22.0 °C / COOLING

BW C3 HISTORY : 001OUTL. WATER3 : +13.0 °CINLET WATER : +18.0 °CAMB. : +22.0 °C / COOLING

BX UNIT INFORMATIONUNITNAME : AC30HPREFRIGERANT : R407CMANUFACT. NR.: 0000000

BW UNIT INFORMATIONSOFTWARE : V02.112

BX DIGITAL INPUTSSAFETY 1 : OKSAFETY 2 : OKSAFETY 3 : OK

BC DIGITAL INPUTSFLOWSWITCH : FLOW OK

BC DIGITAL INPUTSDUAL SETPOINT : SETP. 1REM. START / STOP : STARTREV. PHASE PR. : OK

BC RELAY OUTPUTSCOMPR. 1 : NOT ACTIVECOMPR. 2 : NOT ACTIVECOMPR. 3 : NOT ACTIVE

BC RELAY OUTPUTSLPBYPASS 1 : NOT ACTIVELPBYPASS 2 : NOT ACTIVELPBYPASS 3 : NOT ACTIVE

BC RELAY OUTPUTSFANSP. RY 1 : ACTIVEFANSP. RY 2 : ACTIVEFANSP. RY 3 : ACTIVE

To check the status of the alarm, theoperation and the pump voltage freecontacts.

To check the status of the evaporatorheater. However, the evaporator heateroption is not offered by Daikin.

To change the user password.

NOTE When the selection has been confirmed, the cursorswitches to the BMSCARD INSTALLED parameter. Whenthe modification has been cancelled, the cursorreturns to the upper left corner of the screen.

BC RELAY OUTPUTSALARM : NOT ACTIVEOPERATION : ACTIVEPUMP : ACTIVE

BW RELAY OUTPUTSEV. HEATER : NOT ACTIVE

B CHANGE PASSWORD

NEW PASSWORD : 0000 CONFIRM : 0000

Operation manual

9EUWA15~35HDZ


BMSBOARD SETTINGS screen of the user settings menu are available.These screens are used to set BMS parameters.

To select BMS address card installed or not installed, proceed asfollows:


If the controller is already in the user settings menu, position thecursor in the upper left corner of the actual screen using the zor q key and go to the REMOTE CONTROL screen using the kkey.

2 Position the cursor behind the parameter to be modified usingthe q key.


4 Press q to confirm or press z to cancel the modification.

The cursor returns to the upper left corner of the screen.

Defining and activating the control mode

The unit is equipped with a thermostat which controls the coolingload of the units. When the operator wants to control the load himself,he can activate manual control mode using the MANUAL SETTINGSscreen of the user settings menu. In this case, he has to define thefollowing parameters:

■ the fanspeed (FANSPEED): low, medium, high or very high,

■ the status of the circuits (C1, C2, C3): on or off.

■ the control mode (PRESENT MODE): manual or automatic.

To define and activate or de-activate manual control mode, proceedas follows:

1 Enter the user settings menu and press the m key once to goto the MANUAL SETTINGS screen.

If the controller is already in the user settings menu, position thecursor in the upper left corner of the actual screen using the zor q key and go to the MANUAL SETTINGS screen using the kkey.


3 Select the appropriate setting using the k key.

4 Press q to confirm or z to cancel the selection.

When the selection has been confirmed, the cursor switches tothe next parameter which can now be modified. When theselection has been cancelled, the cursor returns to the upper leftcorner of the screen.

5 Repeat from step 2 onwards to modify the other parameters.

Defining the thermostat settings

When automatic control mode is selected, the unit uses default a 2-step thermostat to control the cooling load. However, the thermostatparameters are not fixed and can be modified via the THERMOSTATSETTINGS screen of the user settings menu.

The default, limit and step values for the thermostat parameters are:

To define the thermostat settings, proceed as follows:

1 Enter the user settings menu and press the m key twice to goto the THERMOSTAT SETTINGS screen.

If the controller is already in the user settings menu, position thecursor in the upper left corner of the actual screen using the zor q key and go to the THERMOSTAT SETTINGS screen using thek key.



4 Press q to confirm or z to cancel the modification.

When the modification has been confirmed, the cursor switchesto the next parameter which can now be modified. When themodification has been cancelled, the cursor returns to the upperleft corner of the screen.

5 Repeat from step 2 onwards to modify the other parameters.

Defining the BMS settings

(Only if the optional BMS-card is installed and theBMSCARD INSTALLED parameter is set to Y)

The BMS parameters allowing communication between the unit andthe supervisory system can be modified via the BMS SETTINGS screenand BMSBOARD SETTINGS screen of the user settings menu. The BMSparameters are:

BMS SETTINGS screen:

■ BMS CONTROL ALLOWED: if set to Y (yes), the unit can becommanded and configured from a supervisory system. If set toN (no), a supervisory system can only read out values butcannot modify them.

■ ADDR.PCB: used to address the PCB.

■ PROTOCOL: indicates the communication protocol. If the Daikinoptional gateway is used to connect the units to a supervisorysystem, the protocol is CAREL.

BMSBOARD SETTINGS screen:

■ SERIAL BOARD: indicates the type of serial connection. Thedefault is set to RS485.

■ BAUD RATE: indicates the speed of communication. The defaultsetting of 19200 bps must be used when the Daikin optionalgateway is connected.

To define the BMS or BMS-board settings, proceed as follows:

1 Enter the user settings menu and press the m key three timesto go to the BMS SETTINGS screen or four times to go to theBMSBOARD SETTINGS screen.

If the controller is already in the user settings menu, position thecursor in the upper left corner of the actual screen using the zor q key and go to the BMS SETTINGS or BMSBOARD SETTINGSscreen using the k key.



4 Press q to confirm or z to cancel the selection.

When the selection has been confirmed, the cursor switches tothe next parameter which can now be modified. When theselection has been cancelled, the cursor returns to the upper leftcorner of the screen.

5 Repeat from step 2 to modify the other parameters.

NOTE To activate manual control mode, select MANUAL aspresent mode. To deactivate the manual control mode,select AUTO as present mode.

Lower limit Upper limit Step Default

STEPS 1 3 1 2STPL (°C) 0.4 2.0 0.1 1.5STEPDIFFERENCE (°C) 0.2 0.8 0.1 0.5LOADUP (sec) 15 300 1 180LOADDOWN (sec) 15 300 1 20

NOTE A functional diagram showing the thermostatparameters can be found in "Annex I" on page 15.


Operation manual

10

Activating or deactivating the setpoints password

The SETPOINT PASSWORD screen of the user settings menu allows theuser to activate or deactivate the user password needed to changethe temperature setpoint. When deactivated, the user does not haveto enter the password each time he wants to change the setpoint.

To activate or deactivate the setpoints password, proceed as follows:

1 Enter the user settings menu and press the m key four timesto go to the SETPOINT PASSWORD screen.

If the controller is already in the user settings menu, position thecursor in the upper left corner of the actual screen using the zor q key and go to the SETPOINT PASSWORD screen using thek key.The question PASSWORD NEEDED TO CHANGE SETPOINTS appears.

2 Press q to start the modification.

The cursor blinks behind the question.


4 Press q to confirm or press z to cancel the selection.

In both cases the cursor returns to the upper left corner of thescreen.

Calibrating the inlet water temperature sensor

In order to measure the inlet water temperature accurately, it ispossible to add an offset value to the measured temperature.

The default, limit and step values are:

To change the offset value, proceed as follows:


If the controller is already in the user settings menu, position thecursor in the upper left corner of the actual screen using the zor q key and go to the SENSOR ACCURACY screen using the kkey.

2 Position the cursor behind the offset value using the q key.


4 Press q to confirm or z to cancel the modification.

When the modification has been confirmed or has beencancelled, the cursor returns to the upper left corner of thescreen.

Tasks of the timers menu

Checking the actual value of the software timers

As a protective measure and to ensure correct operation, thecontroller's software features several countdown timers:

■ LOADUP (LOADUP – refer to the thermostat parameters): startscounting when a thermostat step change has occurred. Duringthe countdown, the unit is not able to enter a higher thermostatstep.

■ LOADDOWN (DWN – refer to the thermostat parameters): startscounting when a thermostat step change has occurred. Duringthe countdown, the unit will not be able to go to a lower thermo-stat step.

■ FLOWSTART (FLOWSTART – 15 sec): counts down when thewater flow through the evaporator is continuous and the unit is instandby. During the countdown, the unit cannot start up.

■ FLOWSTOP (FLOWSTOP – 5 sec): starts counting when the waterflow through the evaporator stops after the flowstart timer hasreached zero. If the water flow has not restarted during thecountdown, the unit will shut down.

■ STARTTIMER (COMPR. STARTED – 5 sec): starts countingwhenever a compressor starts up. During the countdown, noother compressor can start up.

■ GUARDTIMER (GRD1,2,3 – 60 sec): starts counting when thecompressor of circuit 1, respectively circuits 2 and 3, has beenshut down. During the countdown, the compressor cannot berestarted.

■ ANTIRECYCLING 1/2/3 (AREC1,2,3 – 240 sec): starts countingwhen the compressor of circuit 1, respectively circuits 2 and 3,has started. During the countdown, the compressor cannot berestarted.

To check the actual value of the software timers, proceed as follows:

1 Press the e key to enter the timers menu.

The controller displays the actual value of the GENERAL TIMERS:the loadup timer, the loaddown timer, the flowstart timer, theflowstop timer (when the unit is on and the flowstart timer hasreached zero) and the starttimer.

2 Press the m key to check the remaining timers.

The controller shows the actual value of the COMPRESSOR TIMERS:the guard timers (one per circuit) and the antirecycling timers(one per circuit).

Tasks of the safeties menu

Listing activated safeties and checking the unit status

If the alarm buzzer is activated and the user presses the p key, thecontroller automatically enters the safeties menu.

■ The controller will enter the UNIT SAFETY screen of the safetiesmenu when a unit safety was the cause of shutdown. Thisscreen provides the following information:• the activated safety: reverse phase protector or flow switch,• the unit status at the moment of shutdown: the inlet water

temperature and the ambient temperature.

■ The controller will enter the C1, C2 or C3 SAFETY screen of thesafeties menu when a safety of circuit 1, respectively circuit 2 or3 was activated. These screens provide information about thecircuit status at the moment of shutdown: the circuit outlet watertemperature, the inlet water temperature and the ambienttemperature. The controller cannot indicate the activated safetysince all safeties of a circuit are connected in series.

1 Press the p key when the alarm buzzer is activated.

The appropriate safety screen appears.

2 If more than one screen is available (indicated by means of W, Xor C), use the k key to consult them.

Consulting the limit values

Correct operation of the unit can only be guaranteed if the limits foroutlet water temperature, inlet water temperature and ambienttemperature are respected. These limits are according to factorysettings and can only be consulted if the safeties menu is accessible.

To consult the limit values, proceed as follows:

1 Enter the safeties menu using the p key.

2 Press q to enter the TEMPERATURE LIMITS screen.

The controller automatically returns to the safety screen after20 seconds.

Lower limit Upper limit Step Default

-2.0 °C +2.0 °C 0.1 °C 0.0 °C

Operation manual

11EUWA15~35HDZ


Tasks of the history menu

Checking the safety info and the unit status after a reset

The information available in the safeties menu is also stored in thehistory menu, where it is stored after resetting the unit or the circuit.In this way, the history menu provides a means of checking the unitstatus at the moment of the latest shutdown.

To check the safety info and the unit status, proceed as follows:

1 Press the r key to enter the history menu.

The controller enters the UNIT HISTORY screen which contains thefollowing information: the number of shutdowns, the unit safetywhich caused the most recent shutdown and the unit status atthe moment of this shutdown.

2 Press k to consult the C1, C2 or C3 SAFETY screens.

These history screens contain the following information: thenumber of circuit 1 (2 or 3) shutdowns and the circuit status atthe most recent shutdown.

Tasks of the info menu

Consulting additional unit information

1 Press the t key to enter the info menu.

The controller enters the UNIT INFORMATION screen which containsthe following information: the unit name, the refrigerant used andthe manufacturing (serial) number.

2 Press m to consult the second UNIT INFORMATION screen.

This screen contains information about the controller's softwareversion.

Tasks of the input/output menu

Checking the status of the inputs and outputs

The input/output menu provides a means of checking the status ofthe digital inputs and the status of the relay outputs.

The digital inputs are:

■ SAFETY 1 (2 or 3): indicates whether or not one of the circuitsafeties is activated.

■ FLOWSWITCH: indicates the status of the flowswitch: activated ordeactivated.

■ DUAL SETPOINT: indicates the position of the remote dual setpointswitch: setpoint 1 or setpoint 2.

■ REM. START/STOP: indicates the position of the remote on/offswitch.

■ REV. PHASE PR.: indicates whether or not the reverse phaseprotector is activated.

The relay outputs are:

■ COMPR. 1 (2 or 3): indicates the status of the differentcompressors: activated or de-activated.

■ LPBYPASS 1 (2 or 3): indicates the status of the low pressurebypass switches.

■ FANSP. RY 1 (2 or 3): indicates the status of fanspeed relays whichdetermine the speed of the fans.

■ ALARM: indicates the presence or absence of an alarm signal onthe alarm contact (used for the connection of an external alarmindication).

■ OPERATION: indicates whether the unit is in operation or has beenshut down (used for the connection of an external operationindication).

■ PUMP: indicates the status of the pumpcontact.

■ EV. HEATER: indicates the status of the evaporator heater.However, the evaporator heater option is not offered by Daikin.

To check the inputs and outputs, proceed as follows:

1 Press the y key to enter the input/output menu.

The controller enters the first DIGITAL INPUTS screen.

2 Consult the other screens of the input/ouput menu using thek key.

Tasks of the user password menu

Changing the user password

Access to the user settings menu and the setpoints menu isprotected by the user password (a 4-digit number between 0000 and9999).

To change the user password, proceed as follows:

1 Press the a key to enter the password menu.

The controller will request the password.

2 Enter the correct password using the k key.

3 Press q to confirm the password and to enter the passwordmenu.

The controller requests the new password.

4 Press q to start the modification.

The cursor is positioned behind NEW PASSWORD.

5 Enter the new password using the k key.

6 Press q to confirm the new password or a to cancel themodification.

When the new password has been confirmed, the controller willask to enter the new password a second time (for safetyreasons). The cursor is positioned behind CONFIRM.

7 Enter the new password again using the k key.

8 Press q to confirm the new password or a to cancel themodification.

NOTE The actual password will only be changed when thenew password and the confirmed password have thesame value.


Operation manual

12

TROUBLESHOOTING

This section provides useful information for diagnosing and correct-ing certain troubles which may occur in the unit.

Before starting the trouble shooting procedure, carry out a thoroughvisual inspection of the unit and look for obvious defects such asloose connections or defective wiring.

Before contacting your local Daikin dealer, read this chapter carefully,it will save you time and money.

When a safety device was activated, stop the unit and find out whythe safety device was activated before resetting it. Under no circum-stances safety devices may be bridged or changed to a value otherthan the factory setting. If the cause of the problem cannot be found,call your local Daikin dealer.

Symptom 1: The unit does not start, but the ON LED lights up

Symptom 2: The unit does not start, but the ON LED is flashing

Symptom 3: The unit does not start and the ON LED does not light up

Symptom 4: One of the circuits does not start up

Symptom 5: One of the following safety devices is activated

When carrying out an inspection on the supply panel or onthe switch box of the unit, always make sure that the circuitbreaker of the unit is switched off.

POSSIBLE CAUSES CORRECTIVE ACTION

The temperature setting is not correct.

Check the controller setpoint.

The flowstart timer is still running. The unit will start after approx. 15 seconds. Make sure that water is flowing through the evaporator.

Neither one of the circuits can start up.

Refer to "Symptom 4: One of the circuits does not start up"

Unit is in manual mode (both compressors at 0%).

Check on the controller.

Power supply failure. Check the voltage on the supply panel.

Blown fuse or interrupted protection device.

Inspect fuses and protection devices. Replace by fuses of the same size and type (refer to "Electrical specifications" on page 2).

Loose connections. Inspect connections of the field wiring and the internal wiring of the unit. Tighten all loose connections.

Shorted or broken wires. Test circuits using a tester and repair if necessary.


The remote ON/OFF input is enabled and the remote switch is off.

Put the remote switch on or disable the remote ON/OFF input.


All circuits are in failure mode. Refer to "Symptom 5: One of the following safety devices is activated".

One of the following safety devices is activated:• Reverse phase protector (R1P)• Flow switch (S10L)

Refer to "Symptom 5: One of the following safety devices is activated".

The ON LED is broken. Contact your local Daikin dealer.


One of the following safety devices is activated:• Overcurrent relay (K*S)• Discharge thermal protector (Q*D)• Evaporating temperature thermostat (S*T)• Flow switch (S10L)• High pressure switch (S*HP)• Reverse phase protector (R1P)

Check on the controller and refer to "Symptom 5: One of the following safety devices is activated".

The anti-recycling timer is still active. The circuit can only start up after approximately 4 minutes.

The guard timer is still active. The circuit can only start up after approximately 1 minute.

The circuit is disabled due to a too low outlet water temperature.

After temperature rise, the circuit will be enabled automatically.

Symptom 5.1: Overcurrent relay of compressor


Failure of one of the phases. Check fuses on the supply panel or measure the supply voltage.

Voltage too low. Measure the supply voltage.

Overload of motor. Reset. If the failure persists, call your local Daikin dealer.RESETPush the red button on the over-current relay inside the switch box and reset the controller.

Symptom 5.2: Low-pressure switch


Water flow to water heat exchanger too low.

Increase the water flow.

Shortage of refrigerant. Check for leaks and refill refrigerant, if necessary.

Unit is working out of its operation range.

Check the operation conditions of the unit.

Inlet temperature to the water heat exchanger is too low.

Increase the inlet water temperature.

Flow switch is not working or no water flow.

Check the flow switch and the water pump.RESETAfter pressure rise, the low pressure switch resets automatically, but the controller still needs to be reset.

Symptom 5.3: High-pressure switch


Condenser fan does not operate properly.

Check that the fans turn freely. Clean if necessary.

Dirty or partially blocked condenser. Remove any obstacle and clean condenser coil using brush and blower.

Inlet air temperature of the condenser is too high.

The air temperature measured at the inlet of the condenser should not exceed 43°C.RESETAfter pressure decrease, the high pressure switch resets automatically, but the controller still needs to be reset.

Symptom 5.4: Fan thermal protector is activated


Mechanical failure (fan is blocked). Check that the fan rotates freely.

Air flow in the unit too low or outdoor temperature too high.

Clean the air heat exchanger properly.RESETAfter temperature decrease, the thermal protector is reset automatically.If the protector is activated frequently, replace the motor or call your local Daikin dealer.

Operation manual

13EUWA15~35HDZ


Symptom 6: Unit stops soon after operation

Symptom 7: Unit runs continuously and the water temperature remains higher than the temperature set on the controller

Symptom 8: Excessive noises and vibrations of the unit

MAINTENANCE

In order to ensure optimal availability of the unit, a number of checksand inspections on the unit and the field wiring have to be carried outat regular intervals.

If the unit is used for air conditioning application, the describedchecks should be executed at least once a year. In case the unit isused for other applications, the checks should be executed every4 months.

Important information regarding the refrigerant used

This product contains fluorinated greenhouse gases covered by theKyoto Protocol.

Refrigerant type: R407C

GWP(1) value: 1652.5

(1) GWP = global warming potential

Periodical inspections for refrigerant leaks may be requireddepending on European or local legislation. Please contact your localdealer for more information.

Maintenance activities

■ Air heat exchangerRemove dust and any other contaminant from the coil fins usinga brush and a blower. Blow from the inside of the unit. Take carenot to bend or damage the fins.

■ Field wiring and power supply• Check the power supply voltage on the local supply panel.

The voltage should correspond to the voltage marked on theidentification label of the unit.

• Check the connections and make sure they are properlyfixed.

• Check the proper operation of the circuit breaker and theearth leak detector provided on the local supply panel.

■ Internal wiring of the unitVisually check the switch boxes on loose connections (terminalsand components). Make sure that the electrical components arenot damaged or loose.

■ Earth connectionMake sure that the earth wires are still connected properly andthat the earth terminals are tightened.

■ Refrigerant circuit• Check for leaks inside the unit. In case a leak is detected, call

your local Daikin dealer.• Check the working pressure of the unit. Refer to "Switching

the unit on" on page 6 (2).

■ Compressor• Check on oil leaks. If there is an oil leak, call your local Daikin

dealer.• Check for abnormal noises and vibrations. If the compressor

is damaged, call your local Daikin dealer.

■ Fan motor• Clean the cooling ribs of the motor.• Check on abnormal noises. If the fan or motor are damaged,

call your local Daikin dealer.

■ Water supply• Check if the water connection is still well fixed.• Check the water quality (refer to the installation manual of the

unit for specifications of the water quality).

Disposal requirements

Dismantling of the unit, treatment of the refrigerant, oil and eventualother parts, should be done in accordance with the relevant local andnational regulations.

Symptom 5.5: Reverse phase protector is activated


Two phases of the power supply are connected in the wrong phase position.

Invert two phases of the power supply (by licensed electrician).

One phase is not connected properly.

Check the connection of all phases.RESETAfter inverting two phases or fixing the power supply cables properly, the protector is reset automatically, but the controller still needs to be reset.

Symptom 5.6: Discharge thermal protector is activated


Unit is working outside the operation range.

Check the operation condition of the unit.RESETAfter temperature decrease, the thermal protector resets automatically but the controller still needs to be reset.

Symptom 5.7: Flow switch is activated


No water flow. Check the water pump.RESETAfter finding the cause, the flow switch is reset automatically, but the controller still needs to be reset.


One of the safety devices is activated.

Check safety devices (refer to "Symptom 5: One of the following safety devices is activated").

Voltage is too low. Test the voltage in the supply panel and, if necessary, in the electrical compartment of the unit (voltage drop due to supply cables is too high).


The temperature setting on the controller is too low.

Check and adjust the temperature setting.

The heat production in the water circuit is too high.

The cooling capacity of the unit is too low. Call your local Daikin dealer.

Water flow is too high. Recalculate the water flow.


Unit has not been fixed properly. Fix the unit as described in the installation manual.

Before carrying out any maintenance or repair activity,always switch off the circuit breaker on the supply panel,remove the fuses or open the protection devices of the unit.

Do never clean the unit with water under pressure.

The wiring and power supply must be checked by alicensed electrician.


Operation manual

14

ANNEX I

Thermostat parameters

The figure below shows the thermostat parameters.

The default value and the upper and lower limits of the thermostatparameters are listed in the table below.

ANNEX II

Saturated temperature

The figures below represent the average saturated temperature ofR407C in relation to the pressure readout.

INLET CONTROL Default value Lower limit Upper limit

Steplength - a 1.5 K 0.4 K 2.0 KStep difference - b 0.5 K 0.2 K 0.8 KLoad-up time 180 sec 15 sec 300 secLoad-down time 20 sec 15 sec 300 sec

Cooling setpoint - c 12.0°C 7.0°C(a)

(a) For glycol units, the lower limit of the cooling temperature setpoint can be adapted in the factory to 5°C, 3°C, –2°C, –7°C.

25.0°C

Step 0

Step 1

Step 2

Step 3

10°C

c

a b

15°C 25°C 30°C

High pressure side Low pressure side

conditions:- high pressure = 20 bar- subcool = 3°C

10 2015 30255

5

10

15

20

25

30

35

4035 5045 6055 70 °C

bar

65

5

10

9

8

7

6

4

3

2

1

bar

-10 0-5 105-15 2015 3025 4035 50 °C45

Operation manual

15EUWA15~35HDZ


NOTES NOTES

Zandvoordestraat 300, B-8400 Oostende, Belgium 4PW09730-1B

operation manual - khűtős_rendszerek/1... · pdf filerefrigerant type r407c r407c r407c...

Documents