Airwell WELLEA MONOBLOC AW-WHPM05-H91 Service Manual
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Airwell WELLEA MONOBLOC AW-WHPM05-H91 Service Manual

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SERVICE MANUAL
WELLEA MONOBLOC R32
AW-WHPM05-H91
AW-WHPM07-H91
AW-WHPM09-H91
AW-WHPM12-H91
AW-WHPM14-H91
AW-WHPM16-H91
AW-WHPM12-H93
AW-WHPM14-H93
AW-WHPM16-H93
20AW-SERVICE MANUAL WELLEA MONOBLOC R32-20200207-Rev01

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Summary of Contents for Airwell WELLEA MONOBLOC AW-WHPM05-H91

  • Page 1 SERVICE MANUAL WELLEA MONOBLOC R32 AW-WHPM05-H91 AW-WHPM07-H91 AW-WHPM09-H91 AW-WHPM12-H91 AW-WHPM14-H91 AW-WHPM16-H91 AW-WHPM12-H93 AW-WHPM14-H93 AW-WHPM16-H93 20AW-SERVICE MANUAL WELLEA MONOBLOC R32-20200207-Rev01...
  • Page 2 Wellea Monobloc CONTENTS Part 1 General Information ................3 Part 2 Component Layout and Refrigerant Circuits ........5 Part 3 Control ....................13 Part 4 Diagnosis and Troubleshooting ............27...
  • Page 3 Wellea Monobloc...

  • Page 4: Part 1 General Information

    Wellea Monobloc Part 1 General Information 1 Unit Capacities and External Appearance ..........4...
  • Page 5 Wellea Monobloc 1 Unit Capacities and External Appearance 1.1 Unit Capacities Table 1-1.1: Capacity range Capacity 12kW 14kW 16kW Mono Capacity 12kW 14kW 16kW 1.2 External Appearance Table 1-1.2: Unit appearance 5/7/9kW 12/14/16kW...

  • Page 6: Part 2 Component Layout And Refrigerant Circuits

    Wellea monobloc Part 2 Component Layout and Refrigerant Circuits 1 Layout of Functional Components .............. 6 2 Piping Diagrams ..................10 3 Refrigerant Flow Diagrams ............... 12...
  • Page 7 Wellea monobloc 1 Layout of Functional Components AW-WHPM05-H91 / AW-WHPM07-H91 / AW-WHPM09-H91 Figure 2-1.1: top view Figure 2-1.2: front view...
  • Page 8 Wellea Monobloc Figure 2-1.3: oblique view...
  • Page 9 Wellea Monobloc AW-WHPM12-H91 / AW-WHPM14-H91 / AW-WHPM16-H91 AW-WHPM12-H93 / AW-WHPM14-H93 / AW-WHPM16-H93 Figure 2-1.4: top view Figure 2-1.5: front view...
  • Page 10 Wellea Monobloc Figure 2-1.6: oblique view...
  • Page 11 Wellea monobloc 2 Piping Diagrams AW-WHPM05-H91 / AW-WHPM07-H91 / AW-WHPM09-H91 AW-WHPM12-H91 / AW-WHPM14-H91 / AW-WHPM16-H91 AW-WHPM12-H93 / AW-WHPM14-H93 / AW-WHPM16-H93 Figure 2-2.1: piping diagram Pressure sensor 4-way Air side heat exchanger Accumulator Low pressure valve switch Filter High pressure Electronic expansion valve switch Filter capiiiary...
  • Page 12 Wellea Monobloc Key components: 1. Accumulator: Stores liquid refrigerant and oil to protect compressor from liquid hammering. 2. Electronic expansion valve (EXV): Controls refrigerant flow and reduces refrigerant pressure. 3. Four-way valve: Controls refrigerant flow direction. Closed in cooling mode and open in heating mode. When closed, the air side heat exchanger functions as a condenser and water side heat exchanger functions as an evaporator;...
  • Page 13 Wellea monobloc 3 Refrigerant Flow Diagrams Heating and domestic hot water operation Figure 2-3.1: Refrigerant flow during heating or domestic hot water operation Cooling and defrosting operation Figure 2-3.2: Refrigerant flow during cooling and defrosting operations...

  • Page 14: Table Of Contents

    Wellea Monobloc Part 3 Control 1 Stop Operation ..................14 2 Standby Control ..................14 3 Startup Control ..................15 4 Normal Operation Control ............... 17 5 Protection Control ................... 19 6 Special Control ..................23 7 Role of Temperature Sensors in Control Functions ........25...

  • Page 15: Stop Operation

    Wellea Monobloc 1 Stop Operation The stop operation occurs for one of the following reasons: 1. Abnormal shutdown: in order to protect the compressors, if an abnormal state occurs the system makes a 'stop with thermo off’ operation and an error code is displayed on the outdoor unit PCB digital displays and on the user interface.

  • Page 16: Startup Control

    Wellea Monobloc 3 Startup Control 3.1 Compressor Startup Delay Control In initial startup control and in restart control (except in oil return operation and defrosting operation), compressor startup is delayed such that a minimum of the set re-start delay time has elapsed since the compressor stopped, in order to prevent frequent compressor on/off and to equalize the pressure within the refrigerant system.
  • Page 17 Wellea Monobloc Figure 3-4.3: For 12/14/16kW compressor startup program when ambient temperature is at or below 4°C Compressor rotation speed (rps) Target rotation speed 82rps 66rps 56rps 42rps 38rps 33rps 24rps Time (s) Notes: Once the first, 40-second stage of the program is complete, the program proceeds to the subsequent stages in a step-by-step fashion and exits when the target rotation speed has been reached.

  • Page 18: Normal Operation Control

    Wellea Monobloc 4 Normal Operation Control 4.1 Component Control during Normal Operation Table 3-5.1: Component control during heating and domestic hot water operations Wiring diagram Component Control functions and states 5/7/9kW 12/14/16kW label Controlled according to load requirement from Inverter compressor COMP ●...
  • Page 19 Wellea Monobloc 4.4 Four-way Valve Control The four-way valve is used to change the direction of refrigerant flow through the water side heat exchanger in order to switch between cooling and heating/DHW operations. Refer to Figures 2-3.1 and 2-3.2 in Part 2, 3 “Refrigerant Flow Diagrams”.

  • Page 20: Protection Control

    Wellea Monobloc 4.7 Spray liquid cooling control When the discharge temperature of compressor exceeds 105℃, the solenoid valve opens and the frequency of compressor drops in order to reduce the discharge temperature. When the discharge temperature is below 90℃, the solenoid valve closes.
  • Page 21 Wellea Monobloc 5.3 Discharge Temperature Protection Control This control protects the compressor from abnormally high temperatures and transient spikes in temperature. Figure 3-6.3: High discharge temperature protection control Normal operation Discharge temperature > 115°C Discharge temperature < 90°C High discharge temperature protection, error code P4 is displayed When the discharge temperature rises above 115°C the system displays P4 protection and the unit stops running.
  • Page 22 Wellea Monobloc 5.5 Voltage Protection Control This control protects the Wellea Mono from abnormally high or abnormally low voltages. Figure 3-6.4: Compressor voltage protection control Normal operation Voltage ≥ 265V 256V < Voltage < 180V or Voltage ≤ 172V Compressor voltage protection, error code H7 is displayed When the phase voltage of AC power supply is at or above 265V for more than 30 seconds, the system displays H7 protection and the unit stops running.
  • Page 23 Wellea Monobloc 5.8 Module Temperature Protection Control This control protects the module from abnormally high temperatures only for MHC-V5(7,9)W/D2N8. Figure 3-6.3: Module Temperature Protection Control Normal operation Module temperature ≥ 72°C Module temperature ≤ 68°C Module Temperature Protection, error code C7 is displayed When the module temperature rises at or above 72°C the system displays C7 protection and the unit stops running.

  • Page 24: Special Control

    Wellea Monobloc 6 Special Control 6.1 Oil Return Operation In order to prevent the compressor from running out of oil, the oil return operation is conducted to recover oil that has flowed out of the compressor and into the refrigerant piping. When the oil return operation is being conducted, the outdoor unit refrigerant system main PCB displays code d0.
  • Page 25 Wellea Monobloc Table 3-7.3: Component control during defrosting operation Wiring diagram 12/14/16 Component 5/7/9kW Control functions and states label Inverter compressor COMP Runs at defrosting operation rotation speed ● ● DC fan motor / Upper DC fan motor FAN1 / FAN_UP ●...

  • Page 26: Role Of Temperature Sensors In Control Functions

    Wellea Monobloc 7 Role of Temperature Sensors in Control Functions Figure 3-7.1: Location of the temperature sensors on 5~16KW unit systems Notes: The names and functions of the temperature sensors labelled 1 to 12 in this figure are detailed in Table 3-7.1.
  • Page 27 Wellea Monobloc Table 3-7.1: Names and functions of the temperature sensors Sensor Number Sensor name Mode Control functions code  Electronic expansion valve control2 Heating  Discharge superheat control Discharge pipe temperature  Electronic expansion valve control2 sensor  Cooling Outdoor fan control3 ...

  • Page 28: Part 4 Diagnosis And Troubleshooting

    Wellea Monobloc Part 4 Diagnosis and Troubleshooting 1 Outdoor Unit Electric Control Box Layout ..........28 2 Outdoor Unit PCBs ................... 31 3 Error Code Table ..................46 4 Troubleshooting ..................48 5 Appendix to Part 4 ................. 100...
  • Page 29 Wellea Monobloc 1 Outdoor Unit Electric Control Box Layout AW-WHPM05-H91 / AW-WHPM07-H91 / AW-WHPM09-H91 Figure 4-1.1: Electric control box front view Transformers Main PCB for hydronic system Main PCB for refrigerant system Power supply terminals Communication terminal blocks Figure 4-1.2: Electric control box side view Inverter module...
  • Page 30 Wellea Monobloc AW-WHPM12-H91 / AW-WHPM14-H91 / AW-WHPM16-H91 Figure 4-1.3: Electric control box front view Main PCB for refrigerant system Main PCB fort hydronic system Backup electric heater circuit breaker Manual reset thermal cutout Auto reset thermal cutout Backup electric heater contactors Backup electric heater power supply terminals...
  • Page 31 Wellea Monobloc AW-WHPM12-H93 / AW-WHPM14-H93 / AW-WHPM16-H93 Figure 4-1.5: Electric control box front view – top layer Main PCB for refrigerant system Main PCB for hydronic system Backup electric heater circuit breaker Manual reset thermal cutout Auto reset thermal cutout Backup electric heater contactors Transformer...
  • Page 32 Wellea Monobloc 2 Outdoor Unit PCBs 2.1 Types Wellea Mono outdoor units have two main PCBs – one for the hydronic system and one for the refrigerant system. The hydronic system main PCB is the same on all Wellea Mono models. There are three types of refrigerant system main PCB: one for the 5/7/9kW single phase models, one for the 12kW to 16kW single phase models and one for the 12kW to 16kW three phase models.
  • Page 33 Wellea Monobloc Table 4-2.1: Main PCB for hydronic system Label in Code Content Figure 4-2.1 Input port for solar energy Output port for transformer CN36 Power supply port for the wired controller CN12 Port for remote switch Port for flow switch CN14 Port for communication with the wired controller CN19...
  • Page 34 Wellea Monobloc 2.3 Main PCBs for Refrigerant System, Inverter Modules and Filter Boards AW-WHPM05-H91 / AW-WHPM07-H91 / AW-WHPM09-H91 Figure 4-2.2: 5/7/9kW outdoor unit main PCB for refrigerant system 26 25 24 23 18 17 16 Notes: Label descriptions are given in Table 4-2.2.
  • Page 35 Wellea Monobloc Table 4-2.2: 5/7/9kW outdoor unit main PCB for refrigerant system Label in Figure Code Content 4-2.2 CN27 Output port N for invert module PCB Output port N for hydro-box control board CN31 Port for ground wire CN32 Port for IC programming CN37 Port for ground wire CN10...
  • Page 36 Wellea Monobloc Figure 4-2.3: 5/7/9kW outdoor unit inverter module Table 4-2.3: 5/7/9kW outdoor unit inverter module Label in Code Content Figure 4-2.3 Compressor connection port U Compressor connection port V Compressor connection port W CN20 Output port for +12V/5V(CN20) CN19 Port for fan CN302 Reserved...
  • Page 37 Wellea Monobloc AW-WHPM12-H91 / AW-WHPM14-H91 / AW-WHPM16-H91 Figure 4-2.4: MHC-V12( 14, 16)W/D2N8 outdoor unit main PCB for refrigerant 3 4 5 6 7 system 17 16 15 Notes: Label descriptions are given in Table 4-2.4. 201903...
  • Page 38 Wellea Monobloc Table 4-2.4: 12/14/16kW H91 outdoor unit main PCB for refrigerant system Label in Code Content Figure 4-2.4 CN12 Port for low pressure switch and rapid detection CN24 Port for Th temp. sensor CN28 Port for pressure sensor Port for TP temp. sensor Port for outdoor ambient temp.
  • Page 39 Wellea Monobloc Figure 4-2.5: 12/14/16kW H91 outdoor unit inverter module Table 4-2.5: 12/14/16kW H91 outdoor unit inverter module Label in Code Content Figure 4-2.5 Input port P for IPM module Input port for high pressure switch Output port for +15V Port for communication with PCB for refrigerant system Reserved Input port N for IPM module...
  • Page 40 Wellea Monobloc AW-WHPM12-H93 / AW-WHPM14-H93 / AW-WHPM16-H93 Figure 4-2.6: 12/14/16kW H93 outdoor unit main PCB for refrigerant system 22 21 19 18 17 16 15 14 13 Notes: Label descriptions are given in Table 4-2.6.
  • Page 41 Wellea Monobloc Table 4-2.6: 12/14/16kW H93 outdoor unit main PCB for refrigerant system Label in Figure 4-2.6 Code Content CN250 Power supply port for PCB for refrigerant system CN301 Port for IC programming CN36 Port for pressure sensor Port for Th temp. sensor Port for TP temp.
  • Page 42 Wellea Monobloc Figure 4-2.7: 12/14/16kW H93 outdoor unit inverter module Table 4-2.7: 12/14/16kW H93 outdoor unit inverter module Label in Figure 4-2.7 Code Content Output port for +15V Port for communication with PCB for refrigerant system Compressor connection port W Compressor connection port V Compressor connection port U Input port P for IPM module...
  • Page 43 Wellea Monobloc Figure 4-2.8: 12/14/16kW H93 outdoor unit filter board Table 4-2.8: 12/14/16kW H93 outdoor unit filter board Label in Figure 4-2.8 Code Content Power supply L3 Power supply L2 Power supply L1 Power supply N GND_1 Ground wire CN18 Power supply port for load CN19 Power supply port for main control board...
  • Page 44 Wellea Monobloc 2.4 Check Buttons 2.4.1 Main PCB for hydronic system SW4 system check button Button SW4 is used to check the parameters of the hydronic system. Refer to Table 4-2.1 First, press Button SW4 for 3 seconds and the first parameter (operating mode) will be displayed. Then, on each subsequent press, the next parameter is displayed.
  • Page 45 Wellea Monobloc 2.4.2 Main PCB for refrigerant system SW2 system check button Button SW2 is used to check the parameters of the refrigerant system. Refer to Table 4-2.2 First, press Button SW2 for 3 seconds and the first parameter (operating mode) will be displayed. Then, on each subsequent press, the next parameter is displayed.
  • Page 46 Wellea Monobloc 2.4.3 Digital Display Output Table 4-2.11: Digital display output in different operating states Parameters displayed on hydronic Parameters displayed on refrigerant Outdoor unit state system DSP1 system DSP1 On standby Running speed of the compressor in Normal operation Leaving water temperature (°C) rotations per second Error or protection...
  • Page 47 Wellea Monobloc 3 Error Code Table Table 4-3.1: Error code table Error Serial Content Displayed on Remarks code number User interface and refrigerant Transducer module temperature too high protect Contact your local dealer system main PCB User interface and hydronic Water flow failure system main PCB User interface and refrigerant...
  • Page 48 Wellea Monobloc Table 4-3.1: Error code table (continued) User interface and refrigerant Pressure sensor error system main PCB Auxiliary heat source water outlet temperature User interface and hydronic Sensor T1B sensor error system main PCB Water side heat exchanger water outlet User interface and hydronic Sensor Tw_out temperature sensor error...
  • Page 49 Wellea Monobloc 4 Troubleshooting 4.1 Warning Warning  All electrical work must carried by competent and suitably qualified, certified accredited professionals and in accordance with all applicable legislation (all national, local and other laws, standards, codes, rules, regulations and other legislation that apply in a given situation). ...
  • Page 50 Wellea Monobloc 4.2 E0, E8 Troubleshooting 4.2.1 Digital display output 4.2.2 Description  Water flow failure.  E0 indicates E8 has displayed 3 times. When an E0 error occurs, a manual system restart is required before the system can resume operation. ...
  • Page 51 Wellea Monobloc 4.2.4 Procedure E0 / E8 Water flow switch connection on Ensure the switch is connected properly hydronic system main PCB is loose Check the water piping and valves. Make sure the water piping is clean, there is no air in the water piping and all valves are Water flow is insufficient open.
  • Page 52 Wellea Monobloc 4.3 E1 Troubleshooting 4.3.1 Digital display output 4.3.2 Description  Phase sequence error.  Only applies to 3-phase models.  Wellea Mono stops running.  Error code is displayed on refrigerant system main PCB and user interface. 4.3.3 Possible causes ...
  • Page 53 Wellea Monobloc 4.3.4 Procedure The phase sequence of the 3-phase Exchange any two of the 3 phase wires power supply is incrorrect Ensure all supply terminals are securely Some power supply terminals are loose fastened The power supply is abnormal Check the power supply equipment Replace refrigerant system main PCB Notes:...
  • Page 54 Wellea Monobloc 4.4 E2 Troubleshooting 4.4.1 Digital display output 4.4.2 Description  Communication error between outdoor unit and user interface.  Wellea Mono stops running.  Error code is displayed on hydronic system main PCB and user interface. 4.4.3 Possible causes ...
  • Page 55 Wellea Monobloc 4.4.4 Procedure Communication wires P Q E have short circuited, disconnected or are Reconnect the communication wires misconnected Communication wires P Q E are not Connect the communication wires in a connected in a daisy chain daisy chain Wires between outdoor main PCB and electric control box communication Ensure the wires are connected properly...
  • Page 56 Wellea Monobloc 4.5 E3, E4, H2, H3, Ed, HA, H5, H9 Troubleshooting 4.5.1 Digital display output 4.5.2 Description  E3 indicates a backup electric heater water outlet temperature sensor error.  E4 indicates a domestic hot water tank temperature sensor error. ...
  • Page 57 Wellea Monobloc 4.5.4 Procedure E3 / E4 / H2 / H3 / Ed / HA / H5 / H9 Temperature sensor connection on Ensure the sensor is connected properly hydronic system main PCB is loose Temperature sensor has short-circuited Replace the sensor or failed Replace hydronic system main PCB Notes:...
  • Page 58 Wellea Monobloc 4.6 E5, E6, E9, EA Troubleshooting 4.6.1 Digital display output 4.6.2 Description  E5 indicates an air side heat exchanger refrigerant outlet temperature sensor error.  E6 indicates an outdoor ambient temperature sensor error.  E9 indicates a suction pipe temperature sensor error. ...
  • Page 59 Wellea Monobloc 4.6.4 Procedure E5 / E6 / E9 / EA Temperature sensor connection on Ensure the sensor is connected properly refrigerant system main PCB is loose Temperature sensor has short-circuited Replace the sensor or failed Replace refrigerant system main PCB Notes: Air side heat exchanger refrigerant outlet temperature sensor and outdoor ambient temperature sensor connections are port CN9 on the refrigerant system main PCB (labeled 12 in Figure 4-2.2 in Part 4, 2.3 “Main PCBs for Refrigerant System, Inverter Modules and Filter Boards”, (labeled 5 in Figure 4-2.4...
  • Page 60 Wellea Monobloc 4.7 EE Troubleshooting 4.7.1 Digital display output 4.7.2 Description  Hydronic system EEPROM error.  Wellea Mono stops running.  Error code is displayed on hydronic system main PCB and user interface. 4.7.3 Possible causes  Hydronic system main PCB EEPROM is not connected properly. ...
  • Page 61 Wellea Monobloc 4.8 F1 Troubleshooting 4.8.1 Digital display output 4.8.2 Description  Low DC generatrix voltage.  Wellea Mono stops running.  Error code is displayed on hydronic system main PCB and user interface. 4.8.3 Possible causes  The DC generatrix voltage is too low. 4.8.4 Procedure Power supply is abnormal.
  • Page 62 Wellea Monobloc 4.9 HF Troubleshooting 4.9.1 Digital display output 4.9.2 Description  Refrigerant system EEPROM error.  Wellea Mono stops running.  Error code is displayed on refrigerant system main PCB and user interface. 4.9.3 Possible causes  Refrigerant system main PCB EEPROM is not connected properly. ...
  • Page 63 Wellea Monobloc 4.10 H0 Troubleshooting 4.10.1 Digital display output 4.10.2 Description  Communication error between refrigerant system main control chip and hydronic system main control chip.  Wellea Mono stops running.  Error code is displayed on hydronic system main PCB, refrigerant system main PCB and user interface. 4.10.3 Possible causes ...
  • Page 64 Wellea Monobloc 4.11 H1 Troubleshooting 4.11.1 Digital display output 4.11.2 Description  Communication error between refrigerant system main control chip and the inverter driver chip.  Wellea Mono stops running.  Error code H1 is displayed on refrigerant system main PCB and user interface. 4.11.3 Possible causes ...
  • Page 65 Wellea Monobloc 4.12 H6, HH Troubleshooting 4.12.1 Digital display output 4.12.2 Description  H6 indicates a DC fan error.  HH indicates that H6 protection has occurred 10 times in 2 hours. When an HH error occurs, a manual system restart is required before the system can resume operation.
  • Page 66 Wellea Monobloc 4.12.4 Procedure H6 / HH Strong wind is blowing towards the Changer the outdoor unit’s installation fan, making the fan running in the wrong direction or build a shelter to protect the direction fan from strong wind Some power wires or communication Ensure power and communication wires wires of fan are not connected properly are connected properly...
  • Page 67 Wellea Monobloc 4.13 H7 Troubleshooting 4.13.1 Digital display output 4.13.2 Description  Abnormal main circuit voltage.  Wellea Mono stops running.  Error code is displayed on refrigerant system main PCB and user interface. 4.13.3 Possible causes  Power supply voltage not within ±10% of rated voltage or a phase is missing. ...
  • Page 68 Wellea Monobloc 4.13.4 Procedure Power supply voltage is not within ±10% of rated voltage or a (on 3-phase models) Provide normal power supply phase is missing Wires between refrigerant system main PCB, AC filter board (on 3-phase models) Ensure the wires are connected properly and electric control box power supply terminals are loose Outdoor unit powered on immediately...
  • Page 69 Wellea Monobloc 4.14 H8 Troubleshooting 4.14.1 Digital display output 4.14.2 Description  Pressure sensor error.  Wellea Mono stops running.  Error code is displayed on refrigerant system main PCB and user interface. 4.14.3 Possible causes  Pressure sensor not connected properly or has malfunctioned. ...
  • Page 70 Wellea Monobloc 4.15 P0, HP Troubleshooting 4.15.1 Digital display output 4.15.2 Description  P0 indicates suction pipe low pressure protection. When the suction pressure falls below 0.14MPa, the system displays P0 protection and Wellea Mono stops running. When the pressure rises above 0.30MPa, P0 is removed and normal operation resumes.
  • Page 71 Wellea Monobloc 4.15.4 Procedure P0 / HP Insufficient refrigerant caused by Add refrigerant or inspect the system for refrigerant leakage leaks The low pressure side is blocked, caused Inspect the system and fix the error. If the by crushed or bent pipe, blocked EXV, or filter is blocked by ice, the piping should dirty filter be cleaned...
  • Page 72 Wellea Monobloc 4.16 P1 Troubleshooting 4.16.1 Digital display output 4.16.2 Description  Discharge pipe high pressure protection. When the discharge pressure rises above 4.2MPa, the system displays P1 protection and Wellea Mono stops running. When the discharge pressure falls below 3.2MPa, P1 is removed and normal operation resumes.
  • Page 73 Wellea Monobloc 4.16.4 Procedure High pressure switch connection or Ensure the pressure switch is connected pressure sensor connection on properly refrigerant system main PCB is loose Pressure sensor has short-circuited or Replace the pressure sensor failed The high pressure side is blocked, caused Inspect the system and fix the error by crushed or bent pipe or blocked EXV The heat exchange is poor...
  • Page 74 Wellea Monobloc 4.17 P3 Troubleshooting 4.17.1 Digital display output 4.17.2 Description  Compressor current protection.  When the compressor current rises above the protection value (Single phase 5/7/9kW models 20A, single phase 12 to 16kW models 31A, three phase models 15A), the system displays P3 protection and Wellea Mono stops running. When the current returns to the normal range, P3 is removed and normal operation resumes.
  • Page 75 Wellea Monobloc 4.17.4 Procedure The power supply is abnormal Check the power supply equipment The condenser heat exchange is poor Inspect the system and fix the error The high pressure side is blocked, caused Inspect the system and fix the error by crushed or bent pipe or blocked EXV Inverter module has short-circuited Replace the inverter module...
  • Page 76 Wellea Monobloc 4.18 P4 Troubleshooting 4.18.1 Digital display output 4.18.2 Description  Discharge temperature protection.  When the compressor the discharge temperature rises above 115°C, the system displays P4 protection and Wellea Mono stops running. When the discharge temperature falls below 90°C, P4 is removed and normal operation resumes.
  • Page 77 Wellea Monobloc 4.18.4 Procedure Discharge pipe temperature sensor Ensure the temperature sensor is connection on refrigerant system main connected properly PCB is loose Backup electric heater water outlet temperature sensor connection, domestic hot water tank temperature Ensure the temperature sensor is sensor connection or water side heat connected properly exchanger water outlet temperature...
  • Page 78 Wellea Monobloc Notes: Discharge pipe temperature sensor connection is port CN8 on the refrigerant system main PCBs (labeled 11 in Figure 4-2.2 in Part 4, 2.3 “Main PCBs for Refrigerant System, Inverter Modules and Filter Boards”, (labeled 4 in Figures 4-2.4 in Prat 4, 2.3“Main PCBs for Refrigerant System, Inverter Modules and Filter Boards”...
  • Page 79 Wellea Monobloc 4.19 P5 Troubleshooting 4.19.1 Digital display output 4.19.2 Description  High temperature difference between water side heat exchanger water inlet and water outlet temperatures protection.  Wellea Mono stops running.  Error code is displayed on hydronic system main PCB and user interface. 4.19.3 Possible causes ...
  • Page 80 Wellea Monobloc 4.19.4 Procedure Water side heat exchanger water inlet / Ensure the temperature sensor is outlet temperature sensor is loose connected properly Water side heat exchanger water inlet / outlet temperature sensor has Replace the temperature sensor short-circuited or failed Water piping contains air Purge air from the water system The water flow rate is not sufficient,...
  • Page 81 Wellea Monobloc 4.20 P6 Troubleshooting for single-phase models 4.20.1 Digital display output 4.20.2 Description  Inverter module protection.  Wellea Mono stops running.  Error code P6 is displayed on the user interface. Specific error code L0, L1, L2, L4, L5, L7, L8 or L9 is displayed on the refrigerant system main PCB.
  • Page 82 Wellea Monobloc Table 4-4.2: Errors indicated on LED1/2 LED1/2 flashing pattern Corresponding error Flashes 8 times and stops for 1 second, then repeats L0 - Inverter module protection Flashes 9 times and stops for 1 second, then repeats L1 - DC bus low voltage protection Flashes 10 times and stops for 1 second, then repeats L2 - DC bus high voltage protection Flashes 12 times and stops for 1 second, then repeats...
  • Page 83 Wellea Monobloc Figure 4-4.1: Replacing an inverter module Paint a layer of thermally conductive silica gel on the PFC module Paint a layer of thermally conductive silica gel on the IPM module Situation 2: L0 or L4 error appears immediately after the compressor starts up L0 / L4 U V W wire between inverter module and Ensure U V W wire is connected properly...
  • Page 84 Wellea Monobloc Situation 3: L0 or L4 error appears after the compressor has been running for a period of time and the compressor speed is over 60rps L0 / L4 Repaint the thermally conductive silica Inverter module has overheated gel on the PFC and IPM modules (on the reverse side of the inverter module PCB) Inverter module is over-current Replace the compressor...
  • Page 85 Wellea Monobloc 4.20.7 L1/L2 troubleshooting The normal DC voltage between terminals P and N on inverter module is 310V in standby and 380V when the fan motor is running. If the voltage is lower or higher than the normal voltage, the unit displays an L1 or L2 error. Figure 4-4.2: Inverter module terminals Situation 1: L1 or L2 error appears immediately after the outdoor unit is powered-on L1 / L2...
  • Page 86 Wellea Monobloc Figure 4-4.3: Bridge rectifier Single or three phase AC power input DC power output: DC power output: Schematic diagram positive pole negative pole Situation 2: L1 or L2 error appears after the compressor has been running for a period of time and the compressor speed is over 20rps L1 /L2 Relay on main PCB is open...
  • Page 87 Wellea Monobloc 4.21 P6 Troubleshooting for three-phase models 4.21.1 Digital display output 4.21.2 Description  Inverter module protection.  Wellea Mono stops running.  Error code P6 is displayed on the user interface. Specific error code L0, L1, L2, L4, L5, L7, L8 or L9 is displayed on the refrigerant system main PCB.
  • Page 88 Wellea Monobloc The specific error codes can also be obtained from the LED indicators LED1/LED2 on the refrigerant system main PCB. Refer to Figure 4-2.6 in Part 4, 2.3 “Main PCBs for Refrigerant System, Inverter Module and Filter Boards”. Table 4-4.4: Errors indicated on LED1/2 LED1/2 flashing pattern Corresponding error Flashes 8 times and stops for 1 second, then repeats...
  • Page 89 Wellea Monobloc 4.21.6 L0 troubleshooting Situation 1: L0 error appears immediately after the outdoor unit is powered-on Communication wire between refrigerant Ensure communication wire is connected system main PCB and inverter module properly (10 pins) not connected properly Inverter module is damaged Voltage between pins F0 and GND of communication port for connection to Replace the inverter module...
  • Page 90 Wellea Monobloc Situation 2: L0 error appears immediately after the compressor starts up DC bus wire is not connected properly Ensure DC bus wire is connected properly Compressor has malfunctioned Replace the compressor Replace the main PCB Notes: The DC bus wire should run from the N terminal on the inverter module, through the current sensor (in the direction indicated by the arrow on the current sensor), and end at the N terminal of capacitor.
  • Page 91 Wellea Monobloc Situation 3: L0 error appears within 2 seconds of compressor start-up U V W wire between inverter module and Ensure U V W wire is connected properly compressor is not connected properly Communication port for connection to inverter module on refrigerant system Replace the main PCB main PCB is damaged Replace the inverter module...
  • Page 92 Wellea Monobloc Condition 4: L0 error appears after the compressor has been running for a period of time and the compressor speed is over 60rps Repaint the thermally conductive silica Inverter module has overheated gel on the PFC and IPM modules (on the reverse side of the inverter module PCB) Inverter module is over-current Replace the compressor...
  • Page 93 Wellea Monobloc 4.21.7 L1/L2 troubleshooting The normal DC voltage between terminals P and N on inverter module is 540V. If the voltage is lower than 300V, the unit displays an L1 error; if the voltage is higher than 800V, the unit displays an L2 error. Refer to Figure4-4.7. Figure 4-4.7: P, N terminals voltage = 540V DC normal...
  • Page 94 Wellea Monobloc Check the +15V circuit according to corresponding wiring diagram. If CN5 on inverter module output voltage is not +15V means the inverter module is failed. If voltage output of inverter module is +15V means main PCB is failed. Check the bridge rectifier using one of the following two methods (refer to Figure 4-4.9): ...
  • Page 95 Wellea Monobloc 4.21.8 L4 troubleshooting Situation 1: L4 error appears immediately after the outdoor unit is powered-on Replace the main PCB Situation 2: L4 error appears after the compressor has been running for a period of time and the compressor speed is 20 - 30 rps Contactor has failed Replace the contactor...
  • Page 96 Wellea Monobloc 4.22 Pb Troubleshooting 4.22.1 Digital display output 4.22.2 Description  Water side heat exchanger anti-freeze protection.  Wellea Mono stops running.  Error code is displayed on refrigerant system main PCB and ANTI.FREEZE icon is displayed on user interface.
  • Page 97 Wellea Monobloc 4.23 Pd Troubleshooting 4.23.1 Digital display output 4.23.2 Description  High temperature protection of air side heat exchanger refrigerant outlet in cooling mode. When the air side heat exchanger refrigerant outlet temperature is higher than 62°C for more than 3 seconds, the system displays Pd protection and Wellea Mono stops running.
  • Page 98 Wellea Monobloc 4.23.4 Procedure Air side heat exchanger refrigerant outlet Ensure the temperature sensor is temperature sensor is loose connected properly Air side heat exchanger refrigerant outlet temperature sensor has short-circuited Replace the temperature sensor or failed The air side heat exchanger heat Inspect the system and fix the error exchange is poor The fan or fan motor is blocked or...
  • Page 99 Wellea Monobloc 4.24 PP Troubleshooting 4.24.1 Digital display output 4.24.2 Description  Water side heat exchanger inlet temperature is higher than outlet temperature in heating mode.  Wellea Mono stops running.  Error code is displayed on hydronic system main PCB and user interface. 4.24.3 Possible causes ...
  • Page 100 Wellea Monobloc 4.24.4 Procedure Water side heat exchanger water inlet / Ensure the temperature sensor is outlet temperature sensor is loose connected properly Water side heat exchanger water inlet / outlet temperature sensor has Replace the temperature sensor short-circuited or failed The 4-way valve is blocked or damaged Replace the 4-way valve Replace outdoor main PCB...
  • Page 101 Wellea Monobloc 5 Appendix to Part 4 5.1 Temperature Sensor Resistance Characteristics Table 4-5.1: Outdoor ambient temperature sensor, water side heat exchanger refrigerant inlet / outlet (liquid / gas pipe) temperature sensor, air side heat exchanger refrigerant out temperature sensor and suction pipe temperature sensor resistance characteristics Temperature Resistance Temperature...
  • Page 102 Wellea Monobloc Table 4-5.2: Compressor discharge pipe temperature sensor resistance characteristics Temperature Temperature Temperature Temperature Resistance Resistance Resistance Resistance (kΩ) (kΩ) (kΩ) (kΩ) (°C) (°C) (°C) (°C) 542.7 68.66 13.59 3.702 511.9 65.62 13.11 3.595 483.0 62.73 12.65 3.492 455.9 59.98 12.21 3.392...
  • Page 103 Wellea Monobloc Table 4-5.3: Water side heat exchanger water inlet / outlet temperature sensor, backup heater exchanger outlet water temperature sensor and DHW temperature sensor resistance characteristics Temperature Temperature Temperature Temperature Resistance Resistance Resistance Resistance (kΩ) (kΩ) (kΩ) (kΩ) (°C) (°C) (°C) (°C)
  • Page 104 SERVICE MANUAL WELLEA MONOBLOC WARNING: The design and specifications are subject to change without prior notice for product improvement. Consult with the sales agency or manufacturer for details. 20AW-SERVICE MANUAL WELLEA MONOBLOC R32-202000207-Rev01...

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