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Daikin Hardwarekoeling EWYT400B

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Air Cooled chiller/heat pump with scroll compressors

EWYT_B

EWAT_B

REV

Date

10-2024

Supersedes

D-EOMHP01302-20_06EN

Operating Manual

D-EOMHP01302-20_07EN

Public

D-EOMHP01302-20_07EN - 2/64 
TABLE OF CONTENTS 
SAFETY CONSIDERATIONS ....................................................................................................................................... 5 
1  General ................................................................................................................................................................. 5 
2  Before switching the unit ....................................................................................................................................... 5 
3  Avoid electrocution ................................................................................................................................................ 5 
GENERAL DESCRIPTION ............................................................................................................................................ 6 
1  Basic Information .................................................................................................................................................. 6 
2  Abbreviations used ................................................................................................................................................ 6 
3  Controller Operating Limits.................................................................................................................................... 6 
4  Controller Architecture .......................................................................................................................................... 6 
5  Communication Modules ....................................................................................................................................... 7 
USING THE CONTROLLER ......................................................................................................................................... 8 
1  Navigating ............................................................................................................................................................. 8 
2  Passwords............................................................................................................................................................. 8 
3  Editing ................................................................................................................................................................... 9 
4  Mobile app HMI ..................................................................................................................................................... 9 
5  Basic Control System Diagnostic ........................................................................................................................ 10 
6  Controller maintenance ....................................................................................................................................... 11 
7  Optional Remote User Interface .......................................................................................................................... 11 
8  Embedded Web Interface ................................................................................................................................... 12 
WORKING WITH THIS UNIT ...................................................................................................................................... 13 
1  Chiller On/Off ...................................................................................................................................................... 13 
1.1  Keypad On/Off ............................................................................................................................................ 13 
1.2  Scheduler and Silent mode functionalities .................................................................................................. 14 
1.3  Network On/Off ........................................................................................................................................... 15 
2  Water Setpoints ................................................................................................................................................... 15 
3  Unit Mode ............................................................................................................................................................ 15 
3.1  Heat/Cool Switch (Heat Pump Only) ........................................................................................................... 17 
3.2  Energy Saving mode .................................................................................................................................. 17 
4  Unit Status........................................................................................................................................................... 17 
5  Network Control .................................................................................................................................................. 18 
6  Thermostatic Control ........................................................................................................................................... 19 
7  Date/Time............................................................................................................................................................ 20 
8  Pumps ................................................................................................................................................................. 20 
9  External Alarm ..................................................................................................................................................... 21 
10  Power Conservation ............................................................................................................................................ 21 
10.1  Demand Limit.............................................................................................................................................. 21 
10.2  Setpoint Reset ............................................................................................................................................ 22 
10.2.1  Setpoint Reset by OAT (A/C units only) ............................................................................................. 23 
10.2.2  Setpoint Reset by External 4-20Ma signal ......................................................................................... 24 
10.2.3  Setpoint Reset by DT ......................................................................................................................... 24 
11  Electrical Data ..................................................................................................................................................... 25 
12  Controller IP Setup .............................................................................................................................................. 26 
13  Daikin On Site ..................................................................................................................................................... 27 
14  Heat Recovery .................................................................................................................................................... 28 
15  Rapid Restart ...................................................................................................................................................... 28 
16  FreeCooling (Cooling Only) ................................................................................................................................. 29 
16.1  FreeCooling Switch ..................................................................................................................................... 32 
16.2  Network On/Off ........................................................................................................................................... 32 
17  Collective Housing (Changeover Function, Heat Pump only) ............................................................................. 32 
18  Domestic Hot Water ............................................................................................................................................ 33 
19  Bivalent Operations ............................................................................................................................................. 34 
20  Software Options ................................................................................................................................................. 35 
20.1  Changing the Password for buying new Software Options ......................................................................... 35 
20.2  Inserting the Password in a Spare Controller.............................................................................................. 35 
20.3  Modbus MSTP Software Option ................................................................................................................. 36 
20.4  BACNET MSTP .......................................................................................................................................... 37 
20.5  BACNET IP ................................................................................................................................................. 38 
20.6  PERFORMANCE MONITORING ................................................................................................................ 38 
20.7  Cascade ..................................................................................................................................................... 40 
21  Smart Grid Application ........................................................................................................................................ 40 
ALARMS AND TROUBLESHOOTING ....................................................................................................................... 41 
1  Unit Alerts............................................................................................................................................................ 41 

D-EOMHP01302-20_07EN - 3/64 
1.1  BadLWTReset - Bad Leaving Water Temperature Reset Input .................................................................. 41 
1.2  EnergyMeterComm - Energy Meter Communication Fail ........................................................................... 41 
1.3  SmartGridComm – Smart Grid Communication Fail ................................................................................... 41 
1.4  EvapPump1Fault - Evaporator Pump #1 Failure ........................................................................................ 42 
1.5  BadDemandLimit - Bad Demand Limit Input ............................................................................................... 42 
1.6  EvapPump2Fault - Evaporator Pump #2 Failure ........................................................................................ 42 
1.7  Switch Box Temperature sensor fault ......................................................................................................... 43 
1.8  ExternalEvent - External Event ................................................................................................................... 43 
1.9  HeatRec EntWTempSen - Heat Recovery Entering Water Temperature sensor fault ................................ 43 
1.10  HeatRec LvgWTempSen - Heat Recovery Leaving Water Temperature sensor fault ................................ 44 
1.11  HeatRec FreezeAlm - Heat Recovery Water Freeze Protect alarm ............................................................ 44 
1.12  Option1BoardComm – Optional board 1 communication fail ...................................................................... 44 
1.13  Option2BoardComm – Optional board 2 communication fail ...................................................................... 44 
1.14  Option3BoardComm – Optional board 3 communication fail ...................................................................... 45 
1.15  EvapPDSen – Evaporator Pressure Drop sensor fault ............................................................................... 45 
1.16  LoadPDSen – Load Pressure Drop sensor fault ......................................................................................... 46 
1.17  DHW WaterTmpSen – Domestic Hot Water Temperature sensor fault (Heat Pump Only) ......................... 46 
1.18  BivSystLwtRemAlm– Bivalent System LWT Remote Alarm (Heat Pump Only) .......................................... 46 
2  Unit Pumpdown Alarms ....................................................................................................................................... 47 
2.1  UnitOff EvpEntWTempSen - Evaporator Entering Water Temperature (EWT) sensor fault ....................... 47 
2.2  UnitOffLvgEntWTempSen - Evaporator Leaving Water Temperature (LWT) sensor fault .......................... 47 
2.3  UnitOffAmbTempSen - Outside Air Temperature sensor fault .................................................................... 47 
2.4  OAT:Lockout - Outside Air Temperature (OAT) Lockout (only in Cooling Mode)........................................ 48 
2.5  UnitOff CollHsngWTempSen – Collective Housing Water Temperature (LWT) sensor fault (Heat Pump Only)

3  Unit Rapid Stop Alarms ....................................................................................................................................... 48 
3.1  Power Failure - Power Failure (only for units with the UPS option) ............................................................ 48 
3.2  UnitOff EvapFreeze - Evaporator Water Temperature Low alarm .............................................................. 49 
3.3  UnitOff ExternalAlarm - External alarm ....................................................................................................... 49 
3.4  UnitOff PVM - PVM ..................................................................................................................................... 49 
3.5  UnitOff EvapWaterFlow - Evaporator Water Flow Loss alarm .................................................................... 50 
3.6  UnitOff EXVDriverComm - EXV Driver Extension Communication Error .................................................... 50 
3.7  UnitOff Option4BoardComm – Optional board 4 communication fail .......................................................... 50 
3.8  DHW 3WVAlarm – Domestic Hot Water 3 Way Valve Alarm (Heat pump only) ......................................... 51 
3.9  UnitOff WaterOverHeat– Water Over Temperature Alarm .......................................................................... 51 
4  Circuit Events ...................................................................................................................................................... 51 
4.1  Cx CompXStartFail – Compressor starting fail event .................................................................................. 51 
4.2  Cx DischTempUnload – High Discharge Temperature Unload event ......................................................... 52 
4.3  Cx EvapPressUnload – Low Evaporator Pressure Unload event ............................................................... 52 
4.4  Cx CondPressUnload – High Condenser Pressure Unload event .............................................................. 52 
4.5  Cx HighPressPd – High Pressure during Pumpdown event ....................................................................... 53 
4.6  DischTmp CompxSenf – Discharge Temperature of compressor sensor fault ........................................... 53 
4.7  CxStartFail - Start Fail ................................................................................................................................ 53 
5  Circuit Pumpdown Stop Alarms ........................................................................................................................... 54 
5.1  Cx Off DischTmpSen - Discharge Temperature Sensor fault ..................................................................... 54 
5.2  CxOff OffSuctTempSen - Suction Temperature Sensor fault (Heating Only) ............................................. 54 
5.3  CxOff GasLeakage - Gas Leakage fault ..................................................................................................... 55 
6  Circuit Rapid Stop alarms.................................................................................................................................... 55 
6.1  CxOff CondPressSen - Condensing Pressure sensor fault ........................................................................ 55 
6.2  CxOff EvapPressSen - Evaporating Pressure sensor fault ......................................................................... 55 
6.3  CxOff DischTmpHigh - High Discharge Temperature Alarm ....................................................................... 56 
6.4  CxOff CondPressHigh – High Condensing Pressure alarm ........................................................................ 56 
6.5  CxOff EvapPressLow - Low Pressure alarm ............................................................................................... 57 
6.6  CxOff RestartFault – Restart Fault .............................................................................................................. 57 
6.7  CxOff MechHighPress - Mechanical High Pressure Alarm ......................................................................... 58 
6.8  CxOff NoPressChange - No Pressure Change At Start Alarm.................................................................... 58 
6.9  CompXAlm – Compressor starting fail alarm .............................................................................................. 59 
6.10  Cx FailedPumpdown - Failed Pumpdown procedure .................................................................................. 59 
6.11  CmpX Protection – Compressor Protection ................................................................................................ 59 
6.12  CxOff SSH LowLimit – SSH too low ........................................................................................................... 60 
6.13  CxOff Low DSH – DSH too low ................................................................................................................... 60 
6.14  CxOff Drift Suct temp .................................................................................................................................. 60 
6.15  CxOff LowPrRatio - Low Pressure Ratio Alarm .......................................................................................... 60 
6.16  CxEXVDriverFailure – EXV Driver Failure (mono unit) ............................................................................... 61 
6.17  CxOff BadFeedbackVlv – Bad Feedback from Valves Alarm (Cooling Only) ............................................. 61 
6.18  Cx BadFeedbackVlvFC – Bad Feedback from Valves in FreeCooling mode Alarm (Cooling Only) ........... 61 
6.19  CxOff BadFeedbackVlvMech – Bad Feedback from Valves in Mechanical mode Alarm (Cooling Only) .... 62 