Daikin EUWL KZW1 Series Service Manual Download Page 90

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Malfunction Indications and Safeties Overview

ESIE-0303

3–8

Part 3 – Troubleshooting

2.2

Malfunction Indications Overview

Alarm and warning
codes

The following alarm and warning codes can appear on the screen:

What happens in
the event of an
alarm or a warning

In the event of an alarm or a warning, the following happens:

Code

Description

Alarm or
warning

Reset

See page

The anti-freeze alarm has been activated.

Alarm

Manual

2–16

NTC probe used to measure the evaporator inlet water temperature is
defective.

Alarm

Automatic

3–14

NTC probe used to measure the evaporator outlet water temperature is
defective.

Alarm

Automatic

3–14

NTC probe used to measure the condenser inlet water temperature is
defective.

Alarm

Automatic

3–14

EEPROM on the digital controller inside the unit is defective.

Alarm

Automatic

1–43

No water flow for:

■

15 s after the pump was started, or

■

5 s while the compressor is active.

Alarm

Manual

—

The high-pressure switch, the discharge thermal protection or the over-
current protection of the compressor motor is activated .

Alarm

Manual

—

The low-pressure switch is activated.

Alarm

Manual

—

The compressor requires maintenance. The total running hours of the
compressor (direct parameter

) has exceeded the setting of the

timer threshold for maintenance warning (user parameter

—see

"How to access the parameters" on page 2–17).

Warning

Manual

3–9

The compressor requires maintenance. The total running hours of the
compressor (direct parameter

) has exceeded the setting of the

timer threshold for maintenance warning (user parameter

—see

"How to access the parameters" on page 2–17).

Warning

Manual

3–9

fl h1

The reverse phase protector has been activated.

Alarm

Automatic

—

Voltage is too high.

Warning

Automatic

—

Voltage is too low.

Warning

Automatic

—

Noise of power supply

Warning

Automatic

—

Alarm

Warning

■

The unit is shut down.

■

The buzzer is activated.

■

The alarm relay is energized.

■

The display starts flashing, alternately showing the
alarm code(s) and the inlet water temperature.

The display starts flashing, alternately
showing the warning code and the inlet
water temperature.

Summary of Contents for EUWL KZW1 Series

Page 1: ......

Page 2: ......

Page 3: ...KZW1 1 17 1 10 Electrical Specifications EUW24KZW1 1 18 1 11 Electrical Specifications EUWL5 10KZW1 1 19 1 12 Electrical Specifications EUWL12 20KZW1 1 20 1 13 Electrical Specifications EUWL24KZW1 1 21 1 14 Outlook Drawing EUW5 8 10 12KZW1 1 22 1 15 Outlook Drawing EUW16 20 24KZW1 1 24 1 16 Outlook Drawing EUWL5 8 10 12KZW1 1 26 1 17 Outlook Drawing EUWL16 20 24KZW1 1 27 2 Piping Layout 2 1 What I...

Page 4: ...ange EUWL5 24KZW1 2 5 1 4 Compressor Working Status 2 6 1 5 Compressor Timers 2 7 1 6 Thermostat Control EUW5 24KZW1 and EUWL5 24KZW1 2 8 1 7 Pump Steering 2 9 1 8 Freeze up Control 2 10 2 The Digital Controller EUW5 24KZW1 and EUWL5 24KZW1 2 1 What Is in This Chapter 2 11 2 2 The Digital Controller 2 12 2 3 Start Stop 2 14 2 4 What Happens in Case of an Alarm or a Warning 2 16 2 5 Settings Direct...

Page 5: ...cking the Power Supply and Fuses 3 17 4 Troubleshooting 4 1 What Is in This Chapter 3 19 4 2 Items to Be Checked 3 20 4 3 General Repair Procedures 3 22 4 4 Unlocking the Keyboard 3 23 4 5 Replacing the Controller 3 24 4 6 Replacing the PCB EUW5 24KZW1 and EUWL5 24KZW1 3 29 Part 4 Commissioning and Test Run 1 Pre Test Run Checks 1 1 What Is in This Chapter 4 3 1 2 General Checks 4 4 1 3 Water Pipi...

Page 6: ...d Operation Data 2 1 What Is in This Chapter 4 15 2 2 Currents and Used Fuses 4 16 Part 5 Maintenance 1 Maintenance 1 1 What Is in This Chapter 5 3 1 2 Maintenance of the Main Parts 5 4 1 3 Maintenance of the Control Devices 5 6 1 4 Periodical Checks 5 7 ...

Page 7: ...rs Are designed for indoor installation Are used for cooling and heating applications Are available in seven standard sizes with nominal cooling capacities ranging from 13 kW to 65 kW EUWL5 24KZW1 The Daikin EUWL5 24KZ water air cooled water chillers Are designed for indoor installation Are used for cooling and heating applications Are available in seven standard sizes with nominal cooling capacit...

Page 8: ...Introduction ESIE 0303 vi 3 1 4 5 ...

Page 9: ...ne Introduction This part contains an outline of all the relevant elements in the EUW5 24KZW1 and EUWL5 24KZW1 installation What is in this part This part contains the following chapters Chapter See page 1 General Outline 1 3 2 Piping Layout 1 29 3 Wiring Layout 1 43 ...

Page 10: ...ESIE 0303 1 2 Part 1 System Outline 3 1 1 5 ...

Page 11: ...cifications EUW12 20KZW1 1 6 1 4 Technical Specifications EUW24KZW1 1 8 1 5 Technical Specifications EUWL5 10KZW1 1 10 1 6 Technical Specifications EUWL12 20KZW1 1 12 1 7 Technical Specifications EUWL24KZW1 1 14 1 8 Electrical Specifications EUW5 10KZW1 1 16 1 9 Electrical Specifications EUW12 20KZW1 1 17 1 10 Electrical Specifications EUW24KZW1 1 18 1 11 Electrical Specifications EUWL5 10KZW1 1 1...

Page 12: ...Min 19 l min Max 75 l min Min 31 l min Max 123 l min Min 40 l min Max 161 l min Nominal water flow 37 l min 62 l min 80 l min Nominal water pressure drop kPa kPa kPa Insulation material Polyethylene foam Condenser Type Brazed plate heat exchanger No x model Water flow rate Min 24 l min Max 95 l min Min 39 l min Max 157 l min Min 51 l min Max 203 l min Nominal water flow 48 l min 78 l min 102 l min...

Page 13: ...evaporator water temperature from 5 C 5 C 10 C with ZH ZL option to 20 C and a leaving condenser water temperature from 20 C to 55 C Casing Material Polyester coated galvanised steel plate Colour Ivory white Munsell code 5Y7 5 1 RAL 7044 Sound power level 2 64 dB Safety devices Low pressure switch High pressure switch Evaporating temperature protection Discharge temperature protection Outlet water...

Page 14: ...6 l min Min 62 l min Max 247 l min Min 80 l min Max 321 l min Nominal water flow 93 l min 123 l min 161 l min Nominal water pressure drop kPa kPa kPa Insulation material Polyethylene foam Condenser Type Brazed plate heat exchanger No x model Water flow rate Min 59 l min Max 237 l min Min 79 l min Max 314 l min Min 102 l min Max 410 l min Nominal water flow 118 l min 157 l min 205 l min Nominal wat...

Page 15: ...orator water temperature from 5 C 5 C 10 C with ZH ZL option to 20 C and a leaving condenser water temperature from 20 C to 55 C Casing Material Polyester coated galvanised steel plate Colour Ivory white Munsell code 5Y7 5 1 RAL 7044 Sound power level 2 71 dB 67 dB Safety devices Low pressure switch High pressure switch Evaporating temperature protection Discharge temperature protection Outlet wat...

Page 16: ...em 1 311 l No x model Water flow rate Min 93 l min Max 373 l min Nominal water flow 186 l min Nominal water pressure drop kPa Insulation material Polyethylene foam Condenser Type Brazed plate heat exchanger No x model Water flow rate Min 118 l min Max 474 l min Nominal water flow 237 l min Nominal water pressure drop Piping connections Evap water in outlet Cond water in outlet FBSP 40 Refrigerant ...

Page 17: ...ers a leaving evaporator water temperature from 5 C 5 C 10 C with ZH ZL option to 20 C and a leaving condenser water temperature from 20 C to 55 C Material Polyester coated galvanised steel plate Colour Ivory white Munsell code 5Y7 5 1 RAL 7044 Sound power level 2 74 dB Safety devices Low pressure switch High pressure switch Evaporating temperature protection Discharge temperature protection Outle...

Page 18: ...te Min 17 l min Max 69 l min Min 29 l min Max 115 l min Min 38 l min Max 153 l min Nominal water flow 35 l min 57 l min 77 l min Nominal water pressure drop kPa kPa kPa Insulation material Polyethylene foam Condenser Type Piping connections Evap water in outlet FBSP 25 Evaporator drain purge Field installed Discharge connection 12 7 mm flare 19 1 mm flare 19 1 mm flare Liquid connection 9 52 mm fl...

Page 19: ... with the compressor discharge pressure Operation range The operation range covers a leaving evaporator water temperature from 5 C 5 C 10 C with ZH ZL option to 20 C Weight Machine weight 104 kg 138 kg 144 kg Casing Material Polyester coated galvanised steel plate Colour Ivory white Munsell code 5Y7 5 1 RAL 7044 Sound power level 2 64 dB Safety devices Low pressure switch High pressure switch Evap...

Page 20: ...te Min 45 l min Max 179 l min Min 57 l min Max 229 l min Min 77 l min Max 307 l min Nominal water flow 89 l min 115 l min 154 l min Nominal water pressure drop kPa kPa kPa Insulation material Polyethylene foam Condenser Type Piping connections Evap water in outlet FBSP 25 FBSP 40 Evaporator drain purge Field installed Discharge connection 19 1 mm flare 2 x 19 1 mm flare 2 x 19 1 mm flare Liquid co...

Page 21: ...h the compressor discharge pressure Operation range The operation range covers a leaving evaporator water temperature from 5 C 5 C 10 C with ZH ZL option to 20 C Weight Machine weight 149 kg 252 kg 265 kg Casing Material Polyester coated galvanised steel plate Colour Ivory white Munsell code 5Y7 5 1 RAL 7044 Sound power level 2 71 dB 67 dB Safety devices Low pressure switch High pressure switch Ev...

Page 22: ...tem 1 31 l No x model Water flow rate Min 89 l min Max 358 l min Nominal water flow 179 l min Nominal water pressure drop kPa Insulation material Polyethylene foam Condenser Type Piping connections Evap water in outlet FBSP 40 Evaporator drain purge Field installed Discharge connection 2 x 19 1 mm flare Liquid connection 2 x 12 7 mm flare Max lenght circuit 3 50 mm Max height circuit 3 30 mm Refri...

Page 23: ... C 5 This temperature corresponds with the compressor discharge pressure Operation range The operation range covers a leaving evaporator water temperature from 5 C 5 C 10 C with ZH ZL option to 20 C Casing Material Polyester coated galvanised steel plate Colour Ivory white Munsell code 5Y7 5 1 RAL 7044 Sound power level 2 74 dB Safety devices Low pressure switch High pressure switch Evaporating te...

Page 24: ...ressor control circuit pumps Operation range The operation range covers a leaving evaporator water temperature from 5 C 5 C 10 C with ZH ZL option to 20 C Model EUW5KZW1 EUW8KZW1 EUW10KZW1 Power supply Phase 3N Frequency 50 Hz Voltage 400 V Voltage tolerance 10 Unit Starting current 49 A 79 A 109 A Nominal running current 6 6 A 10 4 A 13 1 A Max running current 13 A 19 A 23 A Recommended fuses 3 x...

Page 25: ...or control circuit pumps Operation range The operation range covers a leaving evaporator water temperature from 5 C 5 C 10 C with ZH ZL option to 20 C Model EUW12KZW1 EUW16KZW1 EUW20KZW1 Power supply Phase 3N Frequency 50 Hz Voltage 400 V Voltage tolerance 10 Unit Starting current 129 A 93 A 127 A Nominal running current 15 0 A 20 8 A 26 2 A Max running current 23 A 33 A 41 A Recommended fuses 3 x...

Page 26: ...ent air temperature 35 C Power input is total input Compressor control circuit pumps Operation range The operation range covers a leaving evaporator water temperature from 5 C 5 C 10 C with ZH ZL option to 20 C Model EUW24KZW1 Power supply Phase 3N Frequency 50 Hz Voltage 400 V Voltage tolerance 10 Unit Starting current 149 A Nominal running current 30 A Max running current 45 A Recommended fuses ...

Page 27: ...ature corresponds with the compressor discharge pressure Model EUWL5KZW1 EUWL8KZW1 EUWL10KZW1 Power supply Phase 3N Frequency 50 Hz Voltage 400 V Voltage tolerance 10 Unit Starting current 49 A 79 A 109 A Nominal running current 6 6 A 10 4 A 13 1 A Max running current 13 A 19 A 23 A Recommended fuses 3 x 16 gG 3 x 20 gG 3 x 25 gG Compressor Phase 3 Voltage 400 V Starting current DOL 1 49 0 A 79 0 ...

Page 28: ...ature corresponds with the compressor discharge pressure Model EUWL12KZW1 EUWL16KZW1 EUWL20KZW1 Power supply Phase 3N Frequency 50 Hz Voltage 400 V Voltage tolerance 10 Unit Starting current 129 A 93 A 127 A Nominal running current 15 0 A 20 8 A 26 2 A Max running current 23 A 33 A 41 A Recommended fuses 3 x 25 gG 3 x 25 gG 3 x 40 gG Compressor Phase 3 Voltage 400 V Starting current DOL 1 129 A 79...

Page 29: ...ure bubble 45 C 2 Liquid temperature 40 C 2 This temperature corresponds with the compressor discharge pressure Model EUWL24KZW1 Power supply Phase 3N Frequency 50 Hz Voltage 400 V Voltage tolerance 10 Unit Starting current 149 A Nominal running current 30 A Max running current 45 A Recommended fuses 3 x 50 gG Compressor Phase 3 Voltage 400 V Starting current DOL 1 129 0 A Nom running current 15 0...

Page 30: ...omponents The table below lists the components Required service space around the unit View A A No Component No Component 1 Compressor 11 Condenser entering water temperature sensor 2 Evaporator 12 Digital display controller 3 Condenser 13 Power supply intake Ø 48 4 Switch box 14 Ball valve 5 Chilled water in 15 Water filter 6 Chilled water out 16 Air purge 7 Condenser water OUT 17 Flow switch 8 Co...

Page 31: ...ESIE 0303 General Outline Part 1 System Outline 1 23 3 1 4 5 9 Evaporator entering water temperature sensor 19 Flow switch pipe 10 Freeze up sensor No Component No Component ...

Page 32: ...mponents The table below lists the components Required service space around the unit View A A No Component No Component 1 Compressor 11 Condenser entering water temperature sensor 2 Evaporator 12 Digital display controller 3 Condenser 13 Power supply intake Ø 48 4 Switch box 14 Ball valve 5 Chilled water in 15 Water filter 6 Chilled water out 16 Air purge 7 Condenser water OUT 17 Flow switch 8 Con...

Page 33: ...ESIE 0303 General Outline Part 1 System Outline 1 25 3 1 4 5 9 Evaporator entering water temperature sensor 19 Flow switch pipe 10 Freeze up sensor No Component No Component ...

Page 34: ...nents Required service space around the unit View A A Only for 5HP View A A Only for 8 10 12HP No Component No Component 1 Compressor 10 Freeze up sensor 2 Evaporator 11 Digital display controller 3 Accumulator 12 Power supply intake Ø 48 4 Switch box 13 Ball valve 5 Chilled water IN 14 Water filter 6 Chilled water OUT 15 Air purge 7 Discharge stop valve 16 Flow switch 8 Liquid stop valve 17 Main ...

Page 35: ...ervice space of the unit mm Components The table below lists the components Required service space around the unit View A A No Component No Component 1 Compressor 10 Freeze up sensor 2 Evaporator 11 Digital display controller 3 Accumulator 12 Power supply intake Ø 48 4 Switch box 13 Ball valve 5 Chilled water IN 14 Water filter 6 Chilled water OUT 15 Air purge 7 Discharge stop valve 16 Flow switch...

Page 36: ...General Outline ESIE 0303 1 28 Part 1 System Outline 3 1 1 4 5 8 Liquid stop valve 17 Main switch 9 Evaporator entering water temperature sensor 18 Flow switch pipe No Component No Component ...

Page 37: ...ommon practice and is therefore not described Overview This chapter contains the following topics Topic See page 2 2 Functional Diagram Refrigeration and Water Circuit EUW5 8 10 12KZW1 1 30 2 3 Functional Diagram Refrigeration and Water Circuit EUW16 20 24KZW1 1 33 2 4 Functional Diagram Refrigeration and Water Circuit EUWL5 8 10 12KZW1 1 36 2 5 Functional Diagram Refrigeration and Water Circuit E...

Page 38: ...agram Refrigeration and Water Circuit EUW5 8 10 12KZW1 Functional diagram The illustration below shows the functional diagram of the refrigeration and water circuit of EUW5 8 10 12KZW1 It is also applicable to glycol applications Outlet Water inlet Water Outlet Water inlet Water ...

Page 39: ...on R4T Freeze up protection Flange connection R5T Inlet water condenser temperature sensor Pinched pipe S33T Discharge temperature controller Spinned pipe S4LP Low pressure switch Field piping No Component Function remark a Shut off valve Makes it possible to shut off a part of the water piping for maintenance e g to change a filter b Air purge To purge the water circuit to prevent air from enteri...

Page 40: ...Standard setting ON 21 6 bar 0 1 6 Strainer This strainer prevents dirt particles from entering the expansion valve 7 Water in and outlet connections The water in and outlet connections are made of galvanized steel pipe British Standard Pipe BSP The pipes are not insulated If copper field piping is used for the water circuit then precau tion should be taken to prevent electrolytic corrosion 8 Low ...

Page 41: ...agram Refrigeration and Water Circuit EUW16 20 24KZW1 Functional diagram The illustration below shows the functional diagram of the refrigeration and water circuit of EUW16 20 24KZW1 It is also applicable to glycol applications Outlet Water inlet Water Outlet Water inlet Water ...

Page 42: ... switch Pinched pipe R3T Inlet water evaporator temperature sensor Spinned pipe R4T Freeze up protection Field piping R5T Inlet water condenser temperature sensor Q1D Discharge temperature controller Q2D Discharge temperature controller No Component Function remark a Shut off valve Makes it possible to shut off a part of the water piping for maintenance e g to change a filter b Air purge To purge ...

Page 43: ...tandard setting ON 21 6 bar 0 1 6 Strainer This strainer prevents dirt particles from entering the expansion valve 7 Water in and outlet connections The water in and outlet connections are made of galvanized steel pipe British Standard Pipe BSP The pipes are not insulated If copper field piping is used for the water circuit then precau tion should be taken to prevent electrolytic corrosion 8 Low p...

Page 44: ...unctional Diagram Refrigeration and Water Circuit EUWL5 8 10 12KZW1 Functional diagram The illustration below shows the functional diagram of the refrigeration and water circuit of EUWL5 8 10 12KZW1 It is also applicable to glycol applications Outlet Water inlet Water ...

Page 45: ...w connection R4T Freeze up protection Flange connection Y1S Liquid solenoid valve Pinched pipe Q1D Discharge teperature controller Spinned pipe S4LP Low pressure switch Field piping No Component Function remark a Shut off valve Makes it possible to shut off a part of the water piping for maintenance e g to change a filter b Air purge To purge the water circuit to prevent air from entering the wate...

Page 46: ...ring the expansion valve 7 Water in and outlet connections The water in and outlet connections are made of galvanized steel pipe British Standard Pipe BSP The pipes are not insulated If copper field piping is used for the water circuit then precau tion should be taken to prevent electrolytic corrosion 8 Low pressure service port The low pressure service port is used to connect a low pressure gauge...

Page 47: ...unctional Diagram Refrigeration and Water Circuit EUWL16 20 24KZW1 Functional diagram The illustration below shows the functional diagram of the refrigeration and water circuit of EUWL16 20 24KZW1 It is also applicable to glycol applications Outlet Water inlet Water ...

Page 48: ...ck valve S1HP High pressure switch Flare connection S2HP High pressure switch Screw connection S4LP Low pressure switch Flange connection S5LP Low pressure switch Pinched pipe R3T Inlet water evaporator temperature sensor Spinned pipe R4T Freeze up protection Field piping No Component Function remark a Shut off valve Makes it possible to shut off a part of the water piping for maintenance e g to c...

Page 49: ...ing the expansion valve 7 Water in and outlet connections The water in and outlet connections are made of galvanized steel pipe British Standard Pipe BSP The pipes are not insulated If copper field piping is used for the water circuit then precau tion should be taken to prevent electrolytic corrosion 8 Low pressure service port The low pressure service port is used to connect a low pressure gauge ...

Page 50: ...Piping Layout ESIE 0303 1 42 Part 1 System Outline 3 1 1 4 5 ...

Page 51: ... Main functions of the EUW5 24KZW1 and EUW L 5 24KZW1 Switch box layout Wiring diagram Overview This chapter contains the following topics Topic See page 3 2 Main Functions of the EUW5 24KZW1 and EUWL5 24KZW1 1 44 3 3 Switch Box Layout EUW5 12KZW1 1 45 3 4 Switch Box Layout EUW16 24KZW1 1 47 3 5 PCB Layout of the EUW5 24KZW1 and EUWL5 24KZW1 1 49 3 6 Wiring Diagram 1 53 ...

Page 52: ...8A X9A Q1D Q2D Discharge protector X10A X11A K4S K55 Thermal overcurrent ID4 GND X63A X64A S4LP S5LP Low pressure switch ID5 GND X3M S9S Remote ON OFF Analog input B1 GND X71A 1 4 X60A R3T Evaporator inlet water temperature B2 GND X61A R4T Evaporator outlet water temperature B3 GND X62A R5T Condenser inlet water temperature Y1 GND _ _ _ X2 Digital output C1 2 NO1 X50A X17A X52A K1M Compressor on c...

Page 53: ...ESIE 0303 Wiring Layout Part 1 System Outline 1 45 3 1 4 5 3 3 Switch Box Layout EUW5 12KZW1 Switch box layout The illustration below shows the switch box layout of EUW5 12KZW1 Detail 1 Detail 1 ...

Page 54: ... Power supply transformator 2 A2P I O PCB assembly 3 A1P Microchiller compact 4 K1M Magnetic contactor 5 __ Auxiliary contact for K1M K2M 6 K4S Overcurrent relay 7 __ Omegarail stopper 8 __ Omegarail 9 S12M Main switch 10 R3T Inlet water evaporator temperature sensor 11 R4T Outlet water evaporator temperature sensor 12 R5T Inlet water condenser temperature sensor ...

Page 55: ...ESIE 0303 Wiring Layout Part 1 System Outline 1 47 3 1 4 5 3 4 Switch Box Layout EUW16 24KZW1 Switch box layout The illustration below shows the switch box layout of EUW16 24KZW1 Detail 1 Detail 1 ...

Page 56: ...ransformator 2 A2P I O PCB assembly 3 A1P Microchiller compact 4 __ Omegarail 5 __ Omegarail stopper 6 K2M Magnetic contactor 7 __ Auxiliary contact for K1M K2M 8 K1M Magnetic contactor 9 S12M Main switch 10 K4S K5S Overcurrent relay 11 R3T Inlet water evaporator temperature sensor 12 R4T Outlet water evaporator temperature sensor 13 R5T Inlet water condenser temperature sensor ...

Page 57: ... chiller types EUW5 24KZW1 and EUWL5 24KZW1 X11 X73A X50A X1A X19A X18A X28A X80A X79A X2A X4A X78A X15A X14A X13A X12A X23A X24A X21A X22A Y3R H6P H5P H4P H3P ESH H3P H4P H5P H6P Y3R L N ESH X1M X2M X53A X52A X70A X17A X16A X81A X9A X7A X8A X51A X28A X10A X11A X6A X27A X30A X29A X40A X41A X42A X60A X61A X62A X71A X1 X63A X64A X65A X66A X3A X55A X5A S7S S9S GO G S9S S7S ...

Page 58: ...only for RC unit X17A K1M Compressor contactor coil of circuit 1 NC contact of K1M X18A Y2S Liquid solenoid valve only for RC unit X19A K2M Compressor contactor coil of circuit 2 NC contact of K2M X28A K6S NC Overcurrent relay of pump X30A S10L Flow contactor X50A X2 C1 2 No1 No2 To A1P µchiller compact X51A X2 C3 4 No3 No4 To A1P µchiller compact pump reverse valve X52A K1M NO contact of K1M X53A...

Page 59: ...Gnd X81A E1H Crankcase heater 1 X82A E2H Crankcase heater 2 X1M H3P H4P H5P H6P Y3R Connection for field wiring X2M L N E5H Field connection for option OP10 Evap heater tape X3M G Go Option S9S S7S DONT CONNECT VOLTAGE Field connection for option kit EKAC10A A3P and fieldwiring X11 PE GRN YLW To earth Connector Wiring diagram symbol Description ...

Page 60: ...Wiring Layout ESIE 0303 1 52 Part 1 System Outline 3 1 1 4 5 ...

Page 61: ...ESIE 0302 Wiring Layout Part 1 System Outline 1 53 3 6 Wiring Diagram Wiring diagram ...

Page 62: ...Wiring Layout ESIE 0302 1 54 Part 1 System Outline ...

Page 63: ...e used as background information for troubleshooting This part also contains an extensive overview of the functioning of the controllers Knowledge of the controllers is indispensable and valuable information on servicing and troubleshooting What is in this part This part contains the following chapters Chapter See page 1 Functional Description 2 3 2 The Digital Controller EUW5 24KZW1 and EUWL5 24K...

Page 64: ...ESIE 0303 2 2 Part 2 Functional Description 3 1 2 5 ...

Page 65: ...stem Understanding these functions is vital when diagnosing a malfunction that is related to the functional control Overview This chapter contains the following topics Topic See page 1 2 Operational Range EUW5 24KZW1 2 4 1 3 Operational Range EUWL5 24KZW1 2 5 1 4 Compressor Working Status 2 6 1 5 Compressor Timers 2 7 1 6 Thermostat Control EUW5 24KZW1 and EUWL5 24KZW1 2 8 1 7 Pump Steering 2 9 1 ...

Page 66: ...range of EUW5 24KZW1 Legend The table below describes abbreviations used in the operational range illustration above C LWC LWE C ZL ZH Water Glycol Pattern Abbrevia tion Description LWE Leaving Water Evaporator LWC Leaving Water Condenser ZH Option to produce evaporating leaving water temperature till 5 C ZL Option to produce evaporating leaving water temperature till 10 C ...

Page 67: ...range of EUWL5 24KZW1 Legend The table below describes abbreviations used in the operational range illustration above C LWC LWE C ZL ZH Water Glycol Pattern Abbrevia tion Description LWE Leaving Water Evaporator LWC Leaving Water Condenser ZH Option to produce evaporating leaving water temperature till 5 C ZL Option to produce evaporating leaving water temperature till 10 C ...

Page 68: ...or Working Status Compressor working status The table below gives the conditions of the compressor status The compressor is ON when The compressor is OFF when The ON button is pressed AND Thermostat ON AND No safety activation The OFF button is pressed OR Thermostat OFF OR Safety activation ...

Page 69: ...imers of the compressor Timer Interval s Use Guard timer 60 The timer starts counting down when the scroll compressor is switched OFF During the countdown the compressor can not be restarted Anti recycling timer 240 The timer starts counting down when the scroll compressor is switched ON During the countdown the compressor can not be restarted ...

Page 70: ...describes the step difference 12 C ON r1 Cooling set point default 12 C OFF Compressor 15 C Inlet water temperature evap C Step difference Step difference r3 Heating set point default 30 C 27 C 30 C r1 r2 r3 r4 12 C ON r1 Cooling set point default 12 C OFF Compressor 15 C Inlet water temperature evap C Step difference Step difference r3 Heating set point default 30 C 13 5 C 27 C 28 5 C 30 C Compre...

Page 71: ...without a flow a control is installed to check if there is water flow in the system Pump lead lag time To control the pump lead 15 s and pump lag 0 timer the user has to define code v7 and v8 on the controller Fur further information about the default and limit values of the pump lead lag timers see Settings Direct and User Parameters on page 2 17 ...

Page 72: ...ains the characteristics of the freeze up protection for glycol option Characteristics Freeze up protection Control device Sensor Diagram name R4T Activation Outlet water temperature 4 C Result The circuit is disabled Reset Manually on the controller if temperature 7 5 C C anti freeze hysteresis Result The circuit restarts ZL Activation Outlet water temperature 11 5 C Reset Manually on controller ...

Page 73: ...Introduction This chapter contains information on the digital controller of EUW5 24KZW1 and EUWL5 24KZW1 Overview This chapter contains the following topics Topic See page 2 2 The Digital Controller 2 12 2 3 Start Stop 2 14 2 4 What Happens in Case of an Alarm or a Warning 2 16 2 5 Settings Direct and User Parameters 2 17 2 6 Reading or Adjusting Parameter Settings the Programming Procedure 2 19 ...

Page 74: ...rameters press for 5 s To save a parameter modification To return to normal operation m To deactivate the buzzer in case of an alarm u To scroll up through the list of direct user parameters To increase a parameter value h To switch the unit ON in heating mode press for 5 s only for heat pumps To switch the unit OFF when heating mode is active press for 5 s only for heat pumps c To switch the unit...

Page 75: ...y the settings to other micro controllers LEDs The table below contains an overview of the LEDs and their functions With pu The key is copied into the unit EEPROM after pressing both keys and then powering the unit 1 Key Function LED Function The compressor is inactive Although extra load is requested the compressor cannot start up The compressor is active Heating mode is active only for heat pump...

Page 76: ...ns information on how to select start or stop or how to select cooling or heating mode Setting the temperature Use the u and d keys to adjust the water temperature If start stop set up is and cool heat set up is then to Local h7 0 Local h6 0 Press c for 5 s Start stop in cooling mode Always stop the unit before you switch to cooling because start stop and cool heat are combined in the same button ...

Page 77: ... the following happens Stage Description 1 The o LED starts flashing indicating that the initialization cycle is started The c LED or the h LED lights up indicating whether the cooling or the heating mode is selected 2 When initialization is completed the unit starts and the o LED lights up permanently The numeric display shows the actual inlet water temperature ...

Page 78: ...arning Function Protects the unit Gives additional service information Description The unit is shut down The buzzer is activated The alarm is energized The display starts flashing alternately showing the alarm code s and the inlet water temperature The display starts flashing alternately showing the warning code and the inlet water temperature Action to take Press m to deactivate the buzzer See Wh...

Page 79: ...Type Default Value Limit values Step value EUW5 24KZW1 and EUWL5 24KZW1 d Measurement unit C or F User 0 C 0 or 1 1 r1 Cooling temperature set point Standard Direct 12 0 C 8 0 to 25 0 C 0 1 C ZL option 7 0 to 25 0 C ZH option 2 0 to 25 0 C r2 Cooling temperature difference Direct 3 0 C 0 3 to 19 9 C 0 1 C r3 Heating temperature set point Standard Direct 15 0 to 48 0 C inlet water temperature 0 1 C...

Page 80: ...ettings see Reading or Adjusting Parameter Settings the Programming Procedure on page 2 19 p4 Activation period of the buzzer User 1 min 0 min buzzer disabled 1 14 min buzzer activation period 15 min buzzer activated until m button is pressed 1 min h6 Remote cool heat User 0 0 or 1 1 h7 Remote start stop User 0 0 or 1 1 h8 No of terminals User 0 0 or 1 1 h9 2 Controller keyboard lock User 1 0 Lock...

Page 81: ...fications are not saved Reading or adjusting To read or adjust parameter settings proceed as follows Do you want access to all parameters Start Enter the user password 22 with the u and d keys Press s Select the parameter using the u and d keys Press s to display the value Do you want to adjust the value Adjust the value using the u and d keys Press s to display the parameter Do you want to select...

Page 82: ...The Digital Controller EUW5 24KZW1 and EUWL5 24KZW1 ESIE 0303 2 20 Part 2 Functional Description 3 1 2 4 5 ...

Page 83: ...he input signals to control the output signals If the unit is not performing properly first check the input devices then the digital controllers and finally the output devices What is in this part This part contains the following chapters Chapter See page 1 Inputs and Outputs Overview 3 3 2 Malfunction Indications and Safeties Overview 3 7 3 Checking the Inputs and Outputs 3 13 4 Troubleshooting 3...

Page 84: ...ESIE 0303 3 2 Part 3 Troubleshooting 3 1 3 5 ...

Page 85: ...1 1 What Is in This Chapter Introduction The first step in a troubleshooting procedure is to check the inputs and outputs This chapter contains an overview of the inputs and outputs Overview This chapter contains the following topics Topic See page 1 2 Inputs and Outputs Overview EUW5 24KZW1 and EUWL5 24KZW1 3 4 ...

Page 86: ...e1 a1 Inlet water temperature sensor evaporator R4T X1 B2 GND e2 r6 Outlet water temperature sensor evapora tor R5T X1 B3 GND e3 Inlet water temperature sensor condenser Digital input Trans ducer K4S S1HP QID K5S S2HP Q2D X1 ID3 GND h1 Overcurrent relay high pressure switch discharge protector S4LP S5LP X1 ID4 GND l1 Low pressure switch Control contacts S9S field X1 ID5 GND h7 Switch for remote st...

Page 87: ...ESIE 0303 Inputs and Outputs Overview Part 3 Troubleshooting 3 5 3 3 4 5 1 ...

Page 88: ...Inputs and Outputs Overview ESIE 0303 3 6 Part 3 Troubleshooting 3 1 3 4 5 ...

Page 89: ... 2 1 What Is in This Chapter Introduction The malfunction indication on the digital controller display helps you to find the cause of the problem This chapter describes the malfunction indications and the safeties Overview This chapter contains the following topics Topic See page 2 2 Malfunction Indications Overview 3 8 2 3 Safeties Overview 3 10 ...

Page 90: ...switch the discharge thermal protection or the over current protection of the compressor motor is activated Alarm Manual l1 The low pressure switch is activated Alarm Manual n1 The compressor requires maintenance The total running hours of the compressor direct parameter c9 has exceeded the setting of the timer threshold for maintenance warning user parameter cb see How to access the parameters on...

Page 91: ...Result 1 Press m The buzzer stops 2 Find the cause of the alarm and correct it The system has been repaired 3 Reset the alarm manually by pressing the u and d key simultaneously for 5 s The controller continues its normal opera tion displaying the inlet water temperature Step Action 1 Enter the list of direct parameters by pressing the s key for 5 s The parameter code r1 appears on the display 2 S...

Page 92: ...bar Manual software reset S1PH Switch ON OFF Low pressure switch l1 Low pressure ON Standard 2 0 bar 0 3 ZL ZH 1 5 bar 0 3 Manual software reset S4LP Switch ON OFF Outlet water temp too low freeze up protection a1 Outlet water temp temp 2 5 C temp 11 5 C temp 6 5 C Standard ZL option ZH option Manual software reset R4T NTC sensor Discharge ther mal protector h1 Compressor discharge temp 135 C Manu...

Page 93: ...verse phase has the highest priority Service information for alarm indications If the error is solved H1P and H2P keep their latest status They can only be reset by switching OFF ON the power from the I O PCB If alarm codes fl and h1 are flashing alternately the alarm is likely to be caused by the reverse phase protection Symbol Indication HAP Green LED Blinking CPU OK Not blinking CPU NOK H1P Red...

Page 94: ...Malfunction Indications and Safeties Overview ESIE 0303 3 12 Part 3 Troubleshooting 3 1 3 4 5 ...

Page 95: ...oduction This chapter contains information on how to measure and check the most important inputs and outputs Overview This chapter contains the following topics Topic See page 3 2 Checking the Temperature Sensors 3 14 3 3 Controller Sensors R3T R4T and R5T 3 15 3 4 Checking the Digital Inputs and Outputs 3 16 3 5 Checking the Power Supply and Fuses 3 17 ...

Page 96: ...ing the controller or an output device Temperature sensors The following sensors are connected to the controller R3T R4T R5T How to check To check the temperature sensors proceed as follows Step Action 1 Disconnect the sensor from the terminal connection 2 Measure the temperature and the resistance value 3 Check whether the measured values correspond with the values in the appropriate table Contro...

Page 97: ... 71 29 109 30 105 70 102 20 25 10 10 10 00 9 90 79 1 76 1 71 1 68 28 103 80 100 40 97 16 26 9 73 9 63 9 52 80 1 71 1 66 1 62 27 98 63 95 47 92 41 27 9 38 9 28 9 18 81 1 66 1 62 1 57 26 93 75 90 80 87 93 28 9 04 8 94 8 84 82 1 62 1 57 1 53 25 89 15 86 39 83 70 29 8 72 8 62 8 52 83 1 57 1 53 1 49 24 84 82 82 22 79 71 30 8 41 8 31 8 21 84 1 53 1 49 1 44 23 80 72 78 29 75 93 31 8 11 8 01 7 91 85 1 49 ...

Page 98: ...o PCB The block diagram below shows the digital input route from the transducer e g thermostat pressostat reverse phase etc to the PCB input Output route from PCB The output is generated by the PCB If a device does not operate you should find the relevant output signal from the PCB in order to decide whether the PCB or the device needs replacement The block diagram below shows the output route Uni...

Page 99: ...3U gL gG Circuit Wiring code Type voltage Fuse code Main supply L1 L2 L3 N 3 phases 400 V AC F1U F2U F3U Control circuit PCBs TR1 prim 1 phase 230 V AC F4 TR1 sec 24 V AC F5 Fuses overcurrent EUW5KZW1 EUW8KZW1 EUW10KZW1 EUW12KZW1 EUW16KZW1 EUW20KZW1 EUW24KZW1 F1U F2U F3U 3 x 16 A 3 x 20 A 3 x 25 A 3 x 32 A 3 x 40 A 3 x 50 A 3 x 50 A F4 8 A 8 A 8 A 8 A 8 A 8 A 8 A F5 125 mAT 125 mAT 125 mAT 125 mAT...

Page 100: ...Checking the Inputs and Outputs ESIE 0303 3 18 Part 3 Troubleshooting 3 1 3 4 5 ...

Page 101: ...idea of where to look for malfunctions Furthermore the general procedures for refrigeration circuit and electrical circuit repair are described Not all repair procedures are described Some procedures are considered common practice Overview This chapter contains the following topics Topic See page 4 2 Items to Be Checked 3 20 4 3 General Repair Procedures 3 22 4 4 Unlocking the Keyboard 3 23 4 5 Re...

Page 102: ... Check the remote start stop set up and correct it if necessary In case of remote control check the field wiring One of the timers is still active Check the timers overview in this manual and wait until all timers have elapsed See Compressor Tim ers on page 2 7 The unit is incorrectly programmed Check the settings Do not set the compressor step in manual mode control to 0 Malfunction Possible caus...

Page 103: ... temp 43 C State of the condenser clean Pump operation Water flow blocked valves Flow switch operation Operation condition leaving condenser water 55 C Flow switch or pump contact Damaged flow switch Incorrect pump operation Incorrect field wiring Defective control devices pump relay Flow switch Pump operation Field wiring Control devices Discharge ther mal protector Refrigerant shortage Operation...

Page 104: ...as to comply with all relevant European and national regulations Step Action 1 Recover the refrigerant from the unit It is strictly forbidden to release refrigerant into the atmosphere during service or repair jobs 2 Carry out the repair according to the normal procedure There are no special procedures for the replacement of refrigeration parts See the general Daikin air conditioning service manua...

Page 105: ... ON Unlock the keyboard method 1 To unlock the keyboard according to method 1 proceed as follows Unlock the keyboard method 2 To unlock the keyboard according to method 2 proceed as follows Step Action 1 Press s and p simultaneously for 5 s 2 Scroll using u or d to go to 177 3 Press s 4 Scroll to H9 and change it into 1 5 Press s Step Action 1 Press p for 5 s 2 Scroll using u or d to go to 22 3 Pr...

Page 106: ...ep Action 1 Remove the connections of the old controller 2 Remove the old controller 3 Install the new controller in the same way as the old controller 4 Reconnect the controller 5 Reprogram the controller Step Action Result 1 Turn ON the power supply Make sure that the unit is not working If it is press c to switch OFF the unit 2 Press s and p simultaneously for 5 s After 5 s 0 lights up 3 Scroll...

Page 107: ...eter HC 5 Scroll using u or d to go to parameter H1 You can start initialization 6 Press s 7 Scroll using u or d to change the value to 06 8 Press s You see parameter H1 9 Use u or d to go to the other parameters For the other parameters see the tables further in this section Sensors Regulator Compressor Anti freeze and supporting heaters Alarm Others Step Action 1 Press p 2 Turn OFF the power sup...

Page 108: ... Max cooling set point 25 C 25 C rv Factory Min heating set point 15 C 15 C rd Factory Max heating set point 50 C 50 C Code Parameter Function EUW5 12KZW1 and EUWL5 12KZW1 EUW16 24KZW1 and EUWL16 24KZW1 Read write c1 Factory Min running time 0 s 0 s r w c2 Factory Guard timer 6 x 10 s 6 x 10 s c3 Factory Anti recycling timer 24 x 10 s 24 x 10 s c4 Factory Start delay between the two compressors __...

Page 109: ...eze alarm set point Standard 4 C r w ZL option 11 5 C ZH option 6 5 C a2 Factory Anti freeze alarm hysteresis 3 5 C a3 Factory Bypass time for anti freeze alarm 0 s a7 Factory Limit anti freeze alarm set 15 C Code Parameter Function EUW5 24KZW1 EUWL5 24KZW1 Read write p1 Factory Flow start timer 20 s r w p2 Factory Flow stop timer 5 s p3 Factory LP bypass timer 60 s p4 User Buzzer ON time 1 min p5...

Page 110: ... Cooling heating input 0 h7 User ON OFF input 0 h8 User Number of terminals 0 h9 User Keyboard lock up 1 ha User Serial address 1 hb User Remote control password 1 hv Factory Second set of parameters 1 hd Factory Logic inversion cooling heating 1 he Factory Inversion valve status cool heat 1 hf Factory Alarm relay state without alarm 0 hg User Software release version __ r hh Factory Status of out...

Page 111: ...PCB Function of the dipswitches The table below describes the function of the dipswitches and pushbuttons on the PCB Step Action 1 Switch off the power 2 Remove the connections of the old PCB 3 Remove the old PCB 4 Place the new PCB in the same way as the old PCB 5 Reconnect the PCB 6 Set the dipswitches on the PCB on the right position depending on the unit type 1 2 3 S1A 4 S1A Dipswitch 1 1 0 1 ...

Page 112: ...Troubleshooting ESIE 0303 3 30 Part 3 Troubleshooting 3 1 3 4 5 ...

Page 113: ...re well known practices in service engineering This part contains a systematic approach on test run checks and test values which guarantees a high quality installation and operation of the units What is in this part This part contains the following chapters Chapter See page 1 Pre Test Run Checks 4 3 2 Test Run and Operation Data 4 15 ...

Page 114: ...ESIE 0303 4 2 Part 4 Commissioning and Test Run 3 1 4 5 ...

Page 115: ...ontains checks you have to carry out before every test run Overview This chapter contains the following topics Topic See page 1 2 General Checks 4 4 1 3 Water Piping Checks 4 5 1 4 Water Pressure Drop EUW5 12KZW1 4 8 1 5 Water Pressure Drop EUW16 24KZW1 4 9 1 6 Water Pressure Drop EUWL5 24KZW1 4 10 1 7 Setting of the Flow Switch 4 12 1 8 Electrical Checks 4 14 ...

Page 116: ...e 2 The unit is properly supported and or has a proper foundation 3 The unit is installed horizontally with a deviation of maximum 1 4 Anti vibration pads are required 5 The operator has received the operation manual 6 The installer has received the installation manual 7 The air volume over the coil is adequate there is no blockage from paper plastic or air short circuit due to wrong positioning ...

Page 117: ...taps are installed at the low points of the water piping 10 Other parts of the water circuit are properly mounted and installed e g buffer tank expan sion tank 11 Vibration compensators are mounted at the water connections if the unit is positioned on anti vibration pads Evaporator Condenser Chiller type Minimum water volume Minimum water flow Maximumwater flow Minimum water flow Maximumwater flow...

Page 118: ... ON Water or glycol temperature does not rise too fast when the unit turns OFF with EUWL24KZW1 311 l 89 l min 358 l min __ __ Evaporator Condenser Chiller type Minimum water volume Minimum water flow Maximumwater flow Minimum water flow Maximumwater flow Notation Dimension Description Default V m Required system volume Q W Cooling capacity at the lowest capacity step of each chiller in the system ...

Page 119: ...e Chloride ion mg Cl l 50 50 50 50 Corrosion Sulphate ion mg SO4 2 l 50 50 50 50 Corrosion M alkalinity pH 4 8 mg CaCO3 l 50 50 50 50 Scale Total hardness mg CaCO3 l 70 70 70 70 Scale Calcium hardness mg CaCO3 l 50 50 50 50 Scale Silica ion mg SiO2 l 30 30 30 30 Scale Items to be referred to Iron mg Fe l 1 0 0 3 1 0 0 3 Corrosion scale Copper mg Cu l 1 0 0 1 1 0 0 1 Corrosion Sulphide ion mg S2 l ...

Page 120: ...h condenser for EUW5 12KZW1 Warning Selecting a flow outside the curves can cause damage to or malfunction of the unit See also minimum and maximum allowed water flowrange See Technical Specifications EUW5 10KZW1 on page 1 4 and Technical Specifications EUW12 20KZW1 on page 1 6 0 1 2 9 8 7 6 5 4 3 0 20 40 60 80 100 120 140 160 5hp 8hp 10hp 12hp Pressure drop mH2O Water flow rate l min 0 1 2 9 8 7 ...

Page 121: ...p through condenser for EUW16 24KZW1 Warning Selecting a flow outside the curves can cause damage to or malfunction of the unit See also minimum and maximum allowed water flowrange See Technical Specifications EUW12 20KZW1 on page 1 6 and Technical Specifications EUW24KZW1 on page 1 8 0 1 2 9 8 7 6 5 4 3 0 50 100 150 200 250 300 350 16hp 20hp 24hp Pressure drop mH2O Water flow rate l min 0 1 2 9 8...

Page 122: ...W1 Water pressure drop evaporator for EUWL16 24KZW1 The illustration below shows the water pressure drop through evaporator for EUWL16 24KZW1 10 0 0 20 30 40 50 60 70 80 90 100 110 120 20 40 60 80 100 120 140 160 180 200 5hp 8hp 10hp 12hp Pressure drop mH2O Water flow rate l min 10 0 20 30 40 50 60 70 80 90 100 110 120 20 40 60 80 100 120 0 140 160 180 200 220 240 260 280 300 320 340 360 380 16hp ...

Page 123: ...cting a flow outside the curves can cause damage to or malfunction of the unit See also minimum and maximum allowed water flowrange See Technical Specifications EUWL5 10KZW1 on page 1 10 Technical Specifications EUWL12 20KZW1 on page 1 12 and Technical Specifications EUWL24KZW1 on page 1 14 ...

Page 124: ... Pressure ports before and after pump Water flow regulating valve Flow switch The illustration below shows the flow switch Components The table below list the main components of the flow switch for regulation Flow values The table below contains the values for the flowswitch at 20 C ambient temperature and 20 C water temperature 1 2 No Component Details 1 6 LEDs for visual flow indication 4 green ...

Page 125: ...ust the potentiometer so that the red LED turns on 4 Adjust the potentiometer very carefully so that the red LED is switched off and the yellow LED is lit 5 Adjust the potentiometer very carefully so that the red LED is switched on again 1 6 Raise the water flow until at least one green LED is lit 7 Drop the water flow slowly and steadily until the red LED is lit 8 Record the flow at which the red...

Page 126: ...isolator are installed 2 The main power supply voltage deviates less than 10 from the nominal value 3 The flow switch and pump contact are properly wired 4 The optional wiring for pump control is installed 5 The optional wiring for remote start stop is installed Make sure that the controller is correctly programmed 6 The optional wiring for remote cool heat is installed Make sure that the controll...

Page 127: ...un 4 15 3 4 5 1 Part 4 2 Test Run and Operation Data 2 1 What Is in This Chapter Introduction The table in this chapter contains an overview of the currents and used fuses Overview This chapter contains the following topics Topic See page 2 2 Currents and Used Fuses 4 16 ...

Page 128: ... Recommended fuses according to IEC standard 269 2 gL gG aM also admitted F1U F2U F3U gL gG Unit Nominal current Maximum current Fuses EUW5KZW1 6 6 A 13 A 3 x 16 gL gG EUW8KZW1 10 4 A 19 A 3 x 20 gL gG EUW10KZW1 13 1 A 23 A 3 x 25 gL gG EUW12KZW1 15 0 A 23 A 3 x 25 gL gG EUW16KZW1 20 8 A 33 A 3 x 35 gL gG EUW20KZW1 26 2 A 41 A 3 x 40 gL gG EUW24KZW1 30 0 A 45 A 3 x 50 gL gG ...

Page 129: ...be set up for operation at maximum capacity or to avoid damage The following chapters explain how to or when to maintain the EUW5 24KZW1 and EUWL5 24KZW1 It is also applicable on other types of Daikin chillers What is in this part This part contains the following chapters Chapter See page 1 Maintenance 5 3 ...

Page 130: ...ESIE 0303 5 2 Part 5 Maintenance 3 1 5 ...

Page 131: ...f refrigerant or lead to system contamination Avoid high gas concentrations While the heavy concentration of the refrigerant gas will raise from the floor level good ventilation is a must Avoid all contact with open fires or hot surfaces By high temperatures the refrigerant gas R 407C may decompose into irritating and poisonous gas Avoid skin and hand contact with the liquid refrigerant and protec...

Page 132: ...is condition indicates the required frequency of cleaning and also whether water treatment is needed in the chilled water circuit Check the air plugs and drain plugs to prevent or detect water leakage Check pressure drop and water flow Record temperature difference between in out and water out refrigerant temperature Inspect evaporator insulation If damaged repair to avoid water between insulation...

Page 133: ...nspect the bulb power head capillary connection no chaffing Inspect the equaliser line visually Inspect the feeler bulb suction pipe connection insulation Flow switch and pump interlock Follow the instructions below to check the flow switch and the pump interlock Check operation by ohmmeter after disconnecting the wires to the field terminals and simulating flow and no flow conditions Inspect the ...

Page 134: ...ntrol Devices Preventive maintenance A program of scheduled maintenance should be set up and followed The items mentioned are to be used as a guide and must be used in combination with sound electrical and refrigeration workmanship to ensure trouble free operation and performance ...

Page 135: ...el Check the operation of the safety devices No operation can cause damage of the unit Inspection checks and actions Remarks Check the refrigerant circuit If the unit leaks contact your dealer Inspection checks and actions Remarks Check the water condition Drain the water from the air release plug If the water is dirty replace all the water in the system Dirty water causes a cooling capacity drop ...

Page 136: ... 1 5 5 Noise checks The table below contains the noise checks Inspection checks and actions Remarks Check for any abnormal noise Locate the noise producing section and search the cause If the cause of the noise cannot be located contact your dealer ...

Page 137: ...1 18 EUW5 10KZW1 k 1 16 EUWL12 20KZW k 1 20 EUWL24KZW1 k 1 21 EUWL5 10KZW1 k 1 19 F Freeze up Control k 2 10 Functional Diagram Refrigeration and Water Circuit EUW16 20 24KZW1 k 1 33 EUW5 8 10 12KZW1 k 1 30 EUWL16 20 24KZW1 k 1 39 EUWL5 8 10 12KZW1 k 1 36 G General Checks k 4 4 General Repair Procedures k 3 22 I Inputs and Outputs Overview EUW5 24KZW1 and EUWL5 24KZW1 k 3 4 Items to Be Checked k 3...

Page 138: ...5 24KZW1 and EUWL5 24KZW1 k 3 29 S Safeties Overview k 3 10 Setting of the Flow Switch k 4 12 Settings Direct and User Parameters k 2 17 Start Stop k 2 14 Switch Box Layout EUW16 24KZW1 k 1 47 EUW5 12KZW1 k 1 45 T Technical Specifications EUW12 20KZW1 k 1 6 EUW24KZW1 k 1 8 EUW5 10KZW1 k 1 4 EUWL12 20KZW1 k 1 12 EUWL24KZW1 k 1 14 EUWL5 10KZW1 k 1 10 The Digital Controller k 2 12 Thermostat Control ...

Page 139: ...ESIE 0303 Index 3 3 4 5 1 Wiring Diagram k 1 53 ...

Page 140: ...ESIE 0303 4 Index 3 1 4 5 ...

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