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Air and Water cooled inverter chillers and heat pump
Air cooled:
EWAD TZ
EWAD TZ-B
Water cooled:
EWWD VZ
EWAD TZ - EWAD TZ B - EWWD VZ
Air and Water cooled inverter chillers
and heat pump
Air and Water cooled inverter chillers and heat pump
OPERATION MANUAL
D-EOMZC00105-17EN
D-EOMZC00105-17EN
Operation Manual
1/84
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Table of Contents
Related Manuals for Daikin EWAD TZ-B
Summary of Contents for Daikin EWAD TZ-B
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Page 1: Operation Manual
OPERATION MANUAL Air and Water cooled inverter chillers and heat pump D-EOMZC00105-17EN Air cooled: EWAD TZ EWAD TZ-B Water cooled: EWWD VZ EWAD TZ - EWAD TZ B - EWWD VZ D-EOMZC00105-17EN Air and Water cooled inverter chillers... -
Page 2: Table Of Contents
Air and Water cooled inverter chillers and heat pump TABLE OF CONTENTS 1 SAFETY CONSIDERATIONS ........................7 General ..............................7 Avoid electrocution ..........................7 Safety Devices ............................7 1.3.1 General safety devices ..........................7 1.3.2 Circuit safety devices ............................ 8 1.3.3 Component safety devices ........................... - Page 3 Rapid Restart .............................. 25 4.2.9 Date/Time ..............................25 4.2.10 Scheduler ..............................26 4.2.11 Power Conservation ........................... 26 4.2.12 Controller IP setup ............................27 4.2.13 Daikin on Site.............................. 27 4.2.14 Menu Password ............................27 View/Set Circuit ........................... 28 4.3.1 Data ................................28 4.3.2 Compressor ..............................
- Page 4 Air and Water cooled inverter chillers and heat pump 4.12.3.2 Circuit #1 (Circuit #2 if present) ......................35 4.12.4 Scheduled Maintenance ..........................36 4.13 About this Chiller ..........................36 5 WORKING WITH THIS UNIT ........................37 Unit Setup ............................37 5.1.1 Control Source ............................
- Page 5 Air and Water cooled inverter chillers and heat pump 6.1.3 Bad Leaving Water Temperature Reset Input..................... 54 6.1.4 Condenser Pump #1 Failure (W/C units only)..................... 55 6.1.5 Condenser Pump #2 Failure (W/C units only)..................... 55 6.1.6 Energy Meter Communication Fail ......................55 6.1.7 Evaporator Pump #1 Failure ........................
- Page 6 Air and Water cooled inverter chillers and heat pump 6.5.7 Low Discharge Superheat fault ........................70 6.5.8 Oil Pressure Sensor fault ..........................70 6.5.9 Suction Temperature Sensor fault ......................71 Circuit Rapid Stop Alarms ........................71 6.6.1 Compressor Extension Communication Error (W/C units only) ..............71 6.6.2 EXV Driver Extension Communication Error (W/C units only) ..............
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Page 7: Safety Considerations
Air and Water cooled inverter chillers and heat pump SAFETY CONSIDERATIONS 1.1 General Installation, start-up and servicing of equipment can be hazardous if certain factors particular to the installation are not considered: operating pressures, presence of electrical components and voltages and the installation site (elevated plinths and built-up up structures). -
Page 8: Circuit Safety Devices
Air and Water cooled inverter chillers and heat pump The emergency stop causes all motors to stop, but does not switch off power to the unit. Do not service or operate on the unit without having switched off the main switch. 1.3.2 Circuit safety devices Safety of this level of severity will shut down the circuit they protect. -
Page 9: Available Sensors
Air and Water cooled inverter chillers and heat pump If the circuit operates with a suction pressure lower than an adjustable limit for a certain time the circuit safety logic will shut down the circuit and generate an alarm. The alarm requires a manual action on the Unit Controller to be reset. -
Page 10: Available Controls
Air and Water cooled inverter chillers and heat pump 1.5 Available Controls 1.5.1 Evaporator pumps The controller can regulate one or two evaporator pumps and takes care of automatic change-over between pumps. It’s also possible to prioritize the pumps and temporarily disable one of the two. The controller is also able to control the pump speeds if the pumps are equipped with inverters. -
Page 11: Evaporator Flow Switch
Air and Water cooled inverter chillers and heat pump 1.6.1 Evaporator Flow Switch Although the flow switch is offered as an optional, it is mandatory to install one and connect it to the digital input terminals in order to enable chiller operation only when a minimum flow is sensed. Operating the unit by-passing the flow switch input or without an appropriate flow switch may damage the evaporator due to freezing. -
Page 12: Evaporator Pump Start
Air and Water cooled inverter chillers and heat pump 1.6.11 Evaporator Pump Start A 24 Vdc digital output (with internal supply) is enabled when a pump (#1 or #2) is required to start. The output can be used to start an external pump (either at fixed or variable speed). The output requires an external input or relay with less than 20 mA excitation current. -
Page 13: General Description
Air and Water cooled inverter chillers and heat pump GENERAL DESCRIPTION 2.1 Basic Information Microtech® III is a system for controlling single or dual-circuit air/water-cooled liquid chillers. Microtech® III controls compressor start-up necessary to maintain the desired heat exchanger leaving water temperature. In each unit mode it controls the operation of the condensing devices to maintain the proper condensation process in each circuit. -
Page 14: Controller Architecture
Air and Water cooled inverter chillers and heat pump Air pressure min. 260 hPa, corresponding to max. 10,000 m above sea level. 2.4 Controller Architecture The overall controller architecture is the following: One MicroTech III main controller I/O extensions as needed depending on the configuration of the unit ... -
Page 15: Using The Controller
Air and Water cooled inverter chillers and heat pump USING THE CONTROLLER The control system consists of a unit controller (UC) equipped with a set of extension modules that implement additional features. All boards communicate via an internal peripheral bus with the UC. The Microtech III continuously manages the information received from the various pressure and temperature probes installed on the compressors and communicated to the unit .The UC incorporates a program that controls the unit. -
Page 16: Passwords
Air and Water cooled inverter chillers and heat pump M a i M e n u E n t P a s s w o r U n i u s = U n i A c t S e t 0 °... -
Page 17: Basic Control System Diagnostic
Air and Water cooled inverter chillers and heat pump indicating that a jump to the next level is required. Press the wheel to execute the jump. You will arrive at the Status/ Settings link. There is an arrow indicating that this line is a link to a further menu. Press the wheel again to jump to the next menu, Unit Status/Settings. -
Page 18: Controller Maintenance
Air and Water cooled inverter chillers and heat pump BUS LED BUS LED Bacnet MSTP Bacnet IP Modbus Ready for Communication. (All Ready for Ready for Parameter loaded, Communication. The Communication. The All Communication Solid Green Neuron configured). BACnet Server is started. BACnet Server is started. -
Page 19: Embedded Web Interface
Air and Water cooled inverter chillers and heat pump The initial screen when the remote is turned on shows the units connected to it. Highlight the desired unit and press the wheel to access it. The remote will automatically show the units attached to it, no initial entry is required. - Page 20 Air and Water cooled inverter chillers and heat pump In addition it allows to trend log a maximum of 5 different quantities. It’s required to click on the value of the quantity to monitor and the following additional screen will become visible: Depending on the web browser and its version the trend log feature may not be visible.
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Page 21: Menu Structure
Submenu for electrical data Ctrl IP Setup Submenu for controller IP-address setup Daikin on Site Submenu for connection to Daikin cloud DoS Menu Password Submenu Disable Password for User level 4.2.1 Thermostat Ctrl This page resumes all the parameters related to the unit thermostatic control. -
Page 22: Network Ctrl
Air and Water cooled inverter chillers and heat pump Setpoint/Sub-Menu Default Range Description TZ/TZ B 0.0…5.0°C Start Up DT= 2.7°C 2.7°C Offset to start thermostat control 0.0…1.7°C Shut Dn DT= 1.0°C 1.5°C Offset to standby 0.0…1.7°C Stg Up DT= 0.5°C 0.5°C Offset to allow compressor starts 0.0…1.7°C... -
Page 23: Condenser (W/C Units Only)
Air and Water cooled inverter chillers and heat pump Default Setpoint/Sub-Menu Range Description TZ / TZB Cond Pmp 1 Hrs= Running Hours Condenser Pump 1 (if present) Cond Pmp 2 Hrs= Running Hours Condenser Pump 2 (if present) Speed 2= 0-100% Speed when the input Double Speed Switch is close Thermo Off Speed=... -
Page 24: Data
Air and Water cooled inverter chillers and heat pump 4.2.7.1 Data In this menu are collected all main data related to Master Slave function. Setpoint/Sub-Menu Default Range Description Next On= -,Master, Slave 1, Slave 2, Slave 4 Display next chiller that will be starts Next Off= -,Master, Slave 1, Slave 2, Slave 4 Display next chiller that will be stopped... -
Page 25: Thermostat Ctrl
Air and Water cooled inverter chillers and heat pump Setpoint/Sub-Menu Default Range Description Complete On/Off + Capacity control Control Tmp= Leaving Entering Parameter to define the controlled temperature Leaving Entering - Thermoregulations is based on the Average Entering Water Temperature (AEWT) Leaving - Thermoregulation is based on the Common Leaving Water Temperature (CLWT) -
Page 26: Scheduler
Air and Water cooled inverter chillers and heat pump Setpoint/Sub-Menu Default Range Description TZ / TZ B Actual Time= 12:00:00 12:00:00 Present time Actual Date= 01/01/2014 01/01/2014 Present date UTC Diff= -60min -60min Difference with UTC DLS Enable= No, Yes DLS Strt Month= DayLight Saving time start month DLS Strt Week=... -
Page 27: Controller Ip Setup
4.2.13 Daikin on Site This menu allows to the user to enable the communication with Daikin cloud DoS (Daikin on Site) . This option requires that the controller has access to internet. Please contact your service organization for more details. -
Page 28: View/Set Circuit
Air and Water cooled inverter chillers and heat pump 4.3 View/Set Circuit In this section it is possible to select between the available circuits and access data available for the circuit selected. Setpoint/Sub-Menu Default Range Description Circuit #1 Menu for Circuit #1 ... -
Page 29: Compressor
Air and Water cooled inverter chillers and heat pump Setpoint/Sub-Menu Default Range Description Variable VR St= Off(VR2) VR2 or VR3 slide position status Evap LWT= 7.0°C Evaporator LWT Evap EWT= 12.0°C Evaporator EWT 4.3.2 Compressor This page resumes all the relevant information about compressor. In this page a manual adjustment of the compressor capacity will be possible. -
Page 30: Exv
Air and Water cooled inverter chillers and heat pump Fan settings are set to have a good and stable control of the condenser saturated temperature in almost all operating conditions. Improper modification of the default settings could affect performances and generate circuit alarms. This action must be performed only by trained persons. -
Page 31: Evaporator Lwt
Air and Water cooled inverter chillers and heat pump 4.5 Evaporator LWT This link jumps to the page “Temperatures”. This page resumes all the relevant water temperatures. Setpoint/Sub-Menu Default Range Description TZ/TZ B Evap LWT= -273.1°C -273.1°C Controlled water temperature Evap EWT= -273.1°C -273.1°C... -
Page 32: Unit Enable (A/C Units Only)
Air and Water cooled inverter chillers and heat pump 4.9 Unit Enable (A/C Units only) This page allows to enable or disable unit and circuits. For the unit it also possible enable the operation with time scheduler, while for circuit it is possible to enable the test mode. Setpoint/Sub-Menu Default Range... -
Page 33: Calibrate Sensors
Air and Water cooled inverter chillers and heat pump Low DSH Limit= 12.0°C 12.0°C Minimum acceptable discharge superheat Gas Conc Lim= 200ppm 200ppm Maximum gas concentration limit HP Sw Test C#1 On, Off. Enables to check operation of the high pressure switch on HP Sw Test C#2 On, Off. -
Page 34: Manual Control
Air and Water cooled inverter chillers and heat pump Setpoint/Sub-Menu Default Range Description Evap Pressure= Evaporator Pressure current reading (includes the offset) Evp Pr Offset= 0.0kPa Evaporator Pressure offset Cond Pressure= Condenser Pressure current reading (includes the offset) Cnd Pr Offset= 0.0kPa Condenser Pressure offset Oil Pressure=... -
Page 35: Circuit #1 (Circuit #2 If Present)
Air and Water cooled inverter chillers and heat pump Setpoint/Sub-Menu Default Range Description HR Lwt Res= 0Ohm 340-300kOhm Resistance of the Heat Recovery LWT sensor SwBox Tmp Res= 0Ohm 340-300kOhm Resistance of the Switch Box Temperature sensor Common LWT Res= 0Ohm 340-300kOhm Resistance of the Common LWT sensor... -
Page 36: Scheduled Maintenance
Air and Water cooled inverter chillers and heat pump 4.12.4 Scheduled Maintenance This page may contains the contact number of the Service organization taking care of this unit and the next maintenance visit schedule. Setpoint/Sub-Menu Default Range Description Next Maint= Jan 2015 Schedule date for next maintenance Support Reference=... -
Page 37: Working With This Unit
Air and Water cooled inverter chillers and heat pump WORKING WITH THIS UNIT This section contains a guide on how to deal with the everyday usage of the unit. Next sections describe how to perform routine tasks on the unit, such as: ... -
Page 38: Temperature Settings
Air and Water cooled inverter chillers and heat pump Mode Description Unit Range Heat/Cool Set in case a dual cool/heat mode is required. This setting implies an operation with double w/Glycol functioning which is activated through the Cool/Heat switch on the electric box ... -
Page 39: Thermostat Control Settings
Air and Water cooled inverter chillers and heat pump Double Setpoint, Setpoint Reset and Quiet Mode are not operational in Ice Mode. 5.1.3.2 Thermostat Control Settings Thermostat control settings, allows to set up the response to temperature variations and the precision of the thermostat control. -
Page 40: Alarm Settings
Air and Water cooled inverter chillers and heat pump 5.1.4 Alarm Settings If glycol is present in the water circuits, factory defaults values for the Alarm Limits listed below must be adjusted: Parameter Description Set the minimum refrigerant pressure of the unit. It is generally recommended to set to a value whose saturated Low Press Hold temperature is 8 to 10°C below the minimum active setpoint. -
Page 41: Current Limit (Optional)
Air and Water cooled inverter chillers and heat pump 5.1.5.2 Current Limit (Optional) Current limit function allows to control unit power consumption taking current drawn below a specific limit. Starting from the Current Limit Setpoint defined through the HMI or BAS communication, user can decrease the real limit using an external 4-20mA signal as indicate in the graph below. -
Page 42: Setpoint Reset By External 4-20 Ma Signal
Air and Water cooled inverter chillers and heat pump 5.1.5.5 Setpoint Reset by External 4-20 mA Signal The active setpoint is calculated applying a correction based on an external 4-20mA signal. 4 mA corresponds to 0°C correction, while 20 mA corresponds to a correction of the active setpoint as set in Max Reset (MR). LWT SP + MR Parameter Default... -
Page 43: Date/Time
Air and Water cooled inverter chillers and heat pump 5.1.6 Date/Time 5.1.6.1 Date,Time and UTC Settings See 4.2.5. 5.1.6.2 Quiet Mode Scheduling (A/C units only) The Quiet Mode can be used to reduce chiller noise in certain hours of the day when noise reduction is more important than cooling operation, like for example in night time. -
Page 44: Prepare The Unit To Start
Air and Water cooled inverter chillers and heat pump Overall Status Status text Description Test Mode Unit mode set to Test. This mode is activated to check operability of onboard actuators and sensors. Check with the local maintenance if the Mode can be reverted to the one compatible with unit application (View/Set Unit –... -
Page 45: Keypad Enable
Air and Water cooled inverter chillers and heat pump 5.2.2.3 Keypad Enable The Keypad enable setpoint is not accessible by user password level. If it is set to “Disable”, contact your local maintenance service to check if it can be changed to Enable. 5.2.2.1 BMS Enable The last enable signal is coming through the high level interface, that is from a Building Management System. -
Page 46: Circuits Start Sequence
Air and Water cooled inverter chillers and heat pump Overall Status Status Description Off: Ready Circuit is off waiting for a stage up signal from thermostat control Stage Up Delay Circuit is off waiting for the stage up delay to expire. Cycle Timer Circuit is off waiting for the compressor cycle timer to expire BAS Disable... -
Page 47: High Water Temperature Limit (A/C Units Only)
Air and Water cooled inverter chillers and heat pump Is the circuit required to start? Valve preopening Compressor start Wait thermostat command Is a capacity adjustment required or is a preventive logic active? Adjust capacity Shutdown signal for thermostat or alarm? Pumpdown of circuit then switch compressor off 5.2.6 High Water Temperature Limit (A/C units only) -
Page 48: High Condensing Pressure
Air and Water cooled inverter chillers and heat pump 5.2.8 High Condensing Pressure When the circuit is running and the condensing pressure rises above the safety limits the circuit control logic reacts at two different levels in order to recover the normal running conditions. The two different levels, called High Pressure Hold and High Pressure Unload limits, are calculated by the controller from the maximum condenser pressure allowed by the compressor envelope. -
Page 49: Condensation Control (A/C Units Only)
Air and Water cooled inverter chillers and heat pump display in the circuit status as “Run: High Discharge Temp”. The status is automatically cleared when the discharge temperature falls below the hold limit. 5.3 Condensation Control (A/C units only) Condensing Pressure is controlled in order to achieve best chiller efficiency within compressor envelope limits. Condenser pressure control is achieved through fan staging and/or fan speed control, when the unit is equipped with fan speed regulation option. -
Page 50: Condensation Control (W/C Units Only)
Air and Water cooled inverter chillers and heat pump 2203 Deceleration Time 10 s 10 s 2603 IR compensation Volt 10.5 10.5 2604 IR comp. frequency 2606 Switching Frequency 8kHz 8kHz 2609 Noise Smoothing Enable Enable 2618 FW voltage 400 V 400 V 3006 Motor Thermal Time Constant... -
Page 51: Exv Control
Air and Water cooled inverter chillers and heat pump 1 Vfd by mean of a modulating 0-10V signal generated through a PID controller. The following graph is an example of the modulating signal behavior in case of a PID control supposed to be purely proportional. -
Page 52: Liquid Injection Control
Air and Water cooled inverter chillers and heat pump 5.7 Liquid Injection Control Liquid injection will be activated when the discharge temperature rises above a safety limit temperature to avoid compressor components overheating. Liquid injection will be turned off when the discharge temperature decreases below the activation 5.8 Variable Volume Ratio Control VVR (Variable Volume Ratio) slides in the compressor adapt discharge port geometry to achieve optimum compressor efficiency according to chiller operating conditions. -
Page 53: Alarms And Troubleshooting
Air and Water cooled inverter chillers and heat pump ALARMS AND TROUBLESHOOTING The UC protects the unit and the components from operating in abnormal conditions. Protections can be divided in preventions and alarms. Alarms can then be divided in pump-down and rapid stop alarms. Pump- down alarms are activated when the system or sub-system can perform a normal shutdown in spite of the abnormal running conditions. -
Page 54: Unit Alerts
Air and Water cooled inverter chillers and heat pump 6.1 Unit Alerts 6.1.1 Bad Current Limit Input This alarm is generated when the Flexible Current Limit option has been enabled and the input to the controller is out of the admitted range. Symptom Cause Solution... -
Page 55: Condenser Pump #1 Failure (W/C Units Only)
Air and Water cooled inverter chillers and heat pump 6.1.4 Condenser Pump #1 Failure (W/C units only) This alarm is generated if the pump is started but the flow switch is not able to close within the recirculate time. This can be a temporary condition or may be due to a broken flowswitch, the activation of circuit breakers, fuses or to a pump breakdown. -
Page 56: Evaporator Pump #1 Failure
Air and Water cooled inverter chillers and heat pump Local HMI Automatically clears when Network communication is re-established. Auto 6.1.7 Evaporator Pump #1 Failure This alarm is generated if the pump is started but the flow switch is not able to close within the recirculate time. This can be a temporary condition or may be due to a broken flowswitch, the activation of circuit breakers, fuses or to a pump breakdown. -
Page 57: Fan Alarm Module Communication Fail (A/C Units Only)
Air and Water cooled inverter chillers and heat pump Local HMI The alarm is automatically cleared when Network the problem is solved. Auto NOTE: What above applies in case of configuration of the external fault digital input as Event 6.1.10 Fan Alarm Module Communication Fail (A/C units only) This alarm is generated in case of communication problems with the FAC module. -
Page 58: Heat Recovery Water Temperatures Inverted (A/C Units Only)
Air and Water cooled inverter chillers and heat pump Local HMI Network Auto 6.1.13 Heat Recovery Water Temperatures inverted (A/C units only) This alarm is generated any time that the heat recovery entering water temperature is lower than the leaving by 1°C and at least one compressor is running. -
Page 59: Unit Pumpdown Stop Alarms
Air and Water cooled inverter chillers and heat pump Local HMI Network Auto 6.2 Unit Pumpdown Stop Alarms 6.2.1 Condenser Entering Water Temperature (EWT) sensor fault This alarm is generated any time the input resistance is out of an acceptable range. Symptom Cause Solution... -
Page 60: Evaporator Water Temperatures Inverted
Air and Water cooled inverter chillers and heat pump Reset Notes Local HMI Network 6.2.4 Evaporator Water Temperatures inverted This alarm is generated any time the entering water temperature is lower than the leaving by 1°C and at least one compressor is running since 90 seconds. -
Page 61: Unit Rapid Stop Alarms
Air and Water cooled inverter chillers and heat pump Local HMI Network Auto 6.3 Unit Rapid Stop Alarms 6.3.1 Condenser Water Freeze alarm (W/C units only) This alarm is generated to indicate that the water temperature (entering or leaving) has dropped below a safety limit. -
Page 62: Evaporator Flow Loss Alarm
Air and Water cooled inverter chillers and heat pump String in the alarm snapshot UnitOffEmergencyStop Reset Notes Local HMI Please see note on the top. Network Auto 6.3.4 Evaporator Flow Loss alarm This alarm is generated in case of flow loss to the chiller to protect the machine against freezing. Symptom Cause Solution... -
Page 63: External Alarm
Air and Water cooled inverter chillers and heat pump Wrong freeze limit setpoint. The freeze limit has not been changed as a function of glycol percentage. Reset Notes It’s required to check if the evaporator has Local HMI Network any damage due to this alarm. -
Page 64: Optionctrlrcommfail (A/C Units Only)
Air and Water cooled inverter chillers and heat pump Reset Notes Local HMI Network Auto 6.3.10 OptionCtrlrCommFail (A/C units only) This alarm is generated in case of communication problems with the AC module. Symptom Cause Solution Unit status is Off. Module has no power supply Check power... -
Page 65: Circuit Alerts
Air and Water cooled inverter chillers and heat pump Symptom Cause Solution Unit status is Off. Loss of one phase. Check voltage level on each of the phases. All circuits are stopped immediately. Bell icon is moving on controller’s display. Not correct sequence connection of Check sequence of L1, L2, L3 connections according indication on chiller’s electrical... -
Page 66: Failed Pumpdown
Air and Water cooled inverter chillers and heat pump String in the alarm snapshot Sensor is not good connected (open). Check for correct installation of the sensor Cx EcoTempSen on refrigerant circuit pipe. Check for absence of water or humidity on sensor electrical contacts. -
Page 67: Cxcmp1 Maintcode01 (A/C Units Only)
Air and Water cooled inverter chillers and heat pump String in the alarm list: information about mVolt (mV) range related Cx GasLeakSen to ppm values. String in the alarm log: Sensor is shorted. Check if sensor is shorted with a resistance ... -
Page 68: Circuit Pumpdown Stop Alarms
Air and Water cooled inverter chillers and heat pump Circuit status is On. Chiller main power supply had a down Check if main power supply is within the The controller brings the compressor to peak which caused the trip. acceptable tolerance for this chiller the minimum speed and then normal operation is recovered (default 1200rmp) Bell icon is moving on controller’s display. -
Page 69: High Compressor Vfd Temperature Fault (A/C Units Only)
Air and Water cooled inverter chillers and heat pump 6.5.3 High Compressor Vfd Temperature fault (A/C units only) This alarm is generated to indicate that the Vfd temperature is too high to allow the compressor to run. Symptom Cause Solution Circuit status is Off. -
Page 70: Low Oil Level Fault (W/C Units Only)
Air and Water cooled inverter chillers and heat pump 6.5.6 Low Oil Level fault (W/C units only) This alarm indicates that the oil level inside the oil separator has become too low to allow for a safe operation of the compressor. This switch may not be installed on the unit because in regular operations the oil separation is always granted. -
Page 71: Suction Temperature Sensor Fault
Air and Water cooled inverter chillers and heat pump Local HMI Network Auto 6.5.9 Suction Temperature Sensor fault This alarm is generated to indicate that the sensor is not reading properly. Symptom Cause Solution Circuit status is Off. Sensor is shorted. -
Page 72: Compressor Vfd Fault
Air and Water cooled inverter chillers and heat pump Check if power supply is ok but LEDs are both off. In this case replace the module Reset Notes Local HMI Network Auto 6.6.3 Compressor VFD Fault This alarm indicates an abnormal condition that forced the inverter to stop. Symptom Cause Solution... -
Page 73: Economizer Exv Driver Error (A/C Unit Only)
Air and Water cooled inverter chillers and heat pump Check for correct sensors wiring also according electrical scheme. Reset Notes Local HMI Network Auto 6.6.6 Economizer EXV Driver Error (A/C unit only) This alarm indicates an abnormal condition of the Economizer EXV Driver. Symptom Cause Solution... -
Page 74: Exv Driver Error (A/C Units Only)
Air and Water cooled inverter chillers and heat pump Check for absence of water or humidity on sensor electrical contacts. Check for correct plug-in of the electrical connectors. Check for correct sensors wiring also according electrical scheme. Reset Notes Local HMI ... -
Page 75: Fan Vfd Over Current (A/C Units Only)
Air and Water cooled inverter chillers and heat pump Cx OffStartFailEvpPrLo Circuit refrigerant charge is too low Check refrigerant charge. String in the alarm log: Cx OffStartFailEvpPrLo Check for gas leakage with a sniffer. String in the alarm snapshot Cx OffStartFailEvpPrLo Reset Notes... -
Page 76: High Motor Temperature Alarm
Air and Water cooled inverter chillers and heat pump Circuit status is Off. The ambient temperature is too high (A/C Check the unit selection to see if the unit The compressor does not load anymore or units) or condenser water temperature is can operate at full load. -
Page 77: Low Pressure Alarm
Air and Water cooled inverter chillers and heat pump In case of water cooled chillers operating at high condenser water temperature, if the Condensing saturated temperature exceeds the Maximum condenser saturated temperature, the circuit is only switched off without any notification on the screen as this condition is considered acceptable in this range of operation. Symptom Cause Solution... -
Page 78: Low Pressure Ratio Alarm
Air and Water cooled inverter chillers and heat pump Check the glycol percentage and type (ethilenic or propilenic) Water flow into water heat exchanger is too Increase the water flow. low. Check that evaporator water pump is operating correctly providing the required water flow. -
Page 79: Mechanical High Pressure Alarm
Air and Water cooled inverter chillers and heat pump Reset Notes Local HMI Network Auto 6.6.21 Mechanical High Pressure Alarm This alarm is generated when the condenser pressure rises above the mechanical high pressure limit causing this device to open the power supply to all the auxiliary relays. This causes an immediate shutdown of compressor and all the other actuators in this circuit. -
Page 80: No Pressure At Start Alarm
Air and Water cooled inverter chillers and heat pump EEXV is not working correctly. Check if pump-down can be finished for It’s not opening enough or it’s moving in pressure limit reached; the opposite direction. Check expansion valve movements. Check connection to the valve driver on the wiring diagram. -
Page 81: Undervoltage Alarm
Air and Water cooled inverter chillers and heat pump Symptom Cause Solution Circuit status is Off. Chiller main power supply had an up peak Check if main power supply is within the The circuit is stopped. which caused the trip. acceptable tolerance for this chiller Bell icon is moving on controller’s display. -
Page 82: Options
Air and Water cooled inverter chillers and heat pump OPTIONS 7.1 Total Heat Recovery (Optional – A/C units only) This chiller can handle a total heat recovery option. This feature will require an additional module and sensors to read the entering and leaving heat recovery water temperatures, command a heat recovery water pump. The heat recovery is enabled through the Q8 switch installed on the unit and requires to adjust settings on the unit controller in order to make it work as needed. -
Page 83: Rapid Restart (Optional)
Air and Water cooled inverter chillers and heat pump Once the energy meter has been configured, do the following steps in the unit controller: From Main Menu, go to View/Set Unit Commission Unit Configuration Unit Set Energy Mtr = Nemo D4-L or Nemo D4-Le The energy meter option integrates the current limit function, which allows the unit to limit its capacity in order not to exceed a pre-defined current setpoint. - Page 84 Air and Water cooled inverter chillers and heat pump The present publication is drawn up by of information only and does not constitute an offer binding upon Daikin Applied Europe S.p.A.. Daikin Applied Europe S.p.A. has compiled the content of this publication to the best of its knowledge.