Kaisai 06RY1 Service Manual
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Kaisai 06RY1 Service Manual

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R32
SERVICE MANUAL
MONO TYPE HEAT PUMP

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Summary of Contents for Kaisai 06RY1

  • Page 1 SERVICE MANUAL MONO TYPE HEAT PUMP...
  • Page 2 Mono...
  • Page 3 M thermal Mono Mono CONTENTS Part 1 General Information ................3 Part 2 Component Layout and Refrigerant Circuits ........5 Part 3 Control ....................15 Part 4 Diagnosis and Troubleshooting ............31 202008 Midea CAC Confidential...
  • Page 4 M thermal Mono Mono 202008 Midea CAC Confidential...
  • Page 5 M thermal Mono Mono Part 1 General Information 1 Unit Capacities and External Appearance ..........4 202008 Midea CAC Confidential...
  • Page 6 M thermal Mono Mono 1 Unit Capacities and External Appearance 1.1 Unit Capacities Table 1-1.1: Capacity range Capacity 10kW Model 06RY1 08RY1 10RY1 (KHC-) Capacity 12kW 14kW 16kW Model 12RY3 14RY3 16RY3 (KHC-) Notes: The full model names can be obtained by substituting the asterisk in the model name format given in the left-hand column of the table above with the shortened model names given in the table.
  • Page 7 M thermal Mono Mono Part 2 Component Layout and Refrigerant Circuits 1 Layout of Functional Components .............. 6 2 Piping Diagrams ..................11 3 Refrigerant Flow Diagrams ............... 13 202008 Midea CAC Confidential...
  • Page 8 Mono M thermal Mono 1 Layout of Functional Components KHC-06RY1 Figure 2-1.1: KHC-06RY1 top view Figure 2-1.2: KHC-06RY1 front view 202008 Midea CAC Confidential...
  • Page 9 Mono M thermal Mono Figure 2-1.3: KHC-06RY1 202008 Midea CAC Confidential...
  • Page 10 M thermal Mono Mono KHC-08RY1 / KHC-10RY1 Figure 2-1.1: KHC-08(10)RY1 top view 202008 Midea CAC Confidential...
  • Page 11 M thermal Mono Mono Figure 2-1.2: KHC-08(10)RY1 front view 202008 Midea CAC Confidential...
  • Page 12 Mono M thermal Mono KHC-12RY3 / KHC-14RY3 / KHC-16RY3 Figure 2-1.4: KHC-12(14, 16)RY3 top view Figure 2-1.5: KHC-12(14, 16)RY3 front view 202008 Midea CAC Confidential...
  • Page 13 Mono M thermal Mono 2 Piping Diagrams Figure 2-2.1: KHC-06RY1 / KHC-12(14, 16)RY3 piping diagram Safety valve Air purge valve Pump Twout Flow switch Evaporator Manometer Expansion vessel Twin Filter Pressure sensor Filter DC motor High-pressure switch Low-pressure switch Suction temp. sensor Condenser Discharge temp.
  • Page 14 M thermal Mono Mono 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 15 M thermal Mono Mono 3 Refrigerant Flow Diagrams Heating and domestic hot water operation(4,6KW for example) Figure 2-3.1: Refrigerant flow during heating or domestic hot water operation Cooling and defrosting operation(4,6KW for example) Figure 2-3.2: Refrigerant flow during cooling and defrosting operations 202008 Midea CAC Confidential...
  • Page 16 M thermal Mono Mono 202008 Midea CAC Confidential...

  • Page 17: Table Of Contents

    M thermal Mono Mono Part 3 Control 1 Stop Operation ..................16 2 Standby Control ..................16 3 Startup Control ..................17 4 Normal Operation Control ............... 19 5 Protection Control ................... 21 6 Special Control ..................25 7 Role of Temperature Sensors in Control Functions ........28 202008 Midea CAC Confidential...

  • Page 18: Stop Operation

    M thermal Mono Mono 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 19: Startup Control

    M thermal Mono Mono 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 20 M thermal Mono Mono Figure 3-3.3: 6-10KW compressor startup program when ambient temperature is at or below 3°C (4-6KW)/11°C (8-10KW) TARGET FREQUENCY TIME Figure 3-3.4: 12-16KW compressor startup program when ambient temperature is at or below 3°C TARGET FREQUENCY TIME 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 21: Normal Operation Control

    M thermal Mono Mono 4 Normal Operation Control 4.1 Component Control during Normal Operation Table 3-4.1: Component control during heating and domestic hot water operations Wiring diagram Component Control functions and states 8/10/12/14/16kW label Controlled according to load requirement from Inverter compressor COMP ●...
  • Page 22 M thermal Mono Mono 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. During heating and DHW operations, the four-way valve is on; during cooling and defrosting operations, the four-way valve is off.

  • Page 23: Protection Control

    M thermal Mono Mono 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 100℃, the solenoid valve closes.
  • Page 24 M thermal Mono Mono 5.3 Discharge Temperature Protection Control This control protects the compressor from abnormally high temperatures and transient spikes in temperature. Figure 3-5.3: High discharge temperature protection control Normal operation Discharge temperature > 115°C Discharge temperature < 95°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 25 M thermal Mono Mono 5.5 Voltage Protection Control This control protects the Mono from abnormally high or abnormally low voltages. Figure 3-5.4: Compressor voltage protection control Normal operation Voltage ≥ 265V 254V < Voltage < 187V 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...
  • Page 26 M thermal Mono Mono 5.8 Module Temperature Protection Control This control protects the module from abnormally high temperatures Figure 3-5.3: Module Temperature Protection Control Normal operation Module temperature ≥ Tf2 Module temperature ≤ Tf0-1°C Module Temperature Protection, error code C7 is displayed When the module temperature rises at or above Tf2 the system displays C7 protection and the unit stops running.

  • Page 27: Special Control

    M thermal Mono Mono 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 28 M thermal Mono Mono user interface. Refer to the Mono Engineering Data Book Part 3, 7.4 “DHW MODE SETTING Menu”. Domestic hot water demand priority can be ended by changing the switch on controller from "on" to "off". Table 3-6.5: Component control during fast DHW operation Wiring Component Control functions and states...
  • Page 29 M thermal Mono Mono 6.5 Smart grid control Unit adjusts the operation according to different electrical signals to realize energy saving. Free electric energy signal: DHW mode turn on, the setting temperature will be changed to 70℃ automatically, and the TBH operate as below:T5<69.

  • Page 30: Role Of Temperature Sensors In Control Functions

    M thermal Mono Mono 7 Role of Temperature Sensors in Control Functions Figure 3-7.1: Location of the temperature sensors on 6~16KW unit systems Notes: The names and functions of the temperature sensors labelled 1 to 12 in this figure are detailed in Table 3-6.1.
  • Page 31 M thermal Mono Mono 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 32 M thermal Mono Mono 202008 Midea CAC Confidential...
  • Page 33 M thermal Mono Mono Part 4 Diagnosis and Troubleshooting 1 Outdoor Unit Electric Control Box Layout ..........32 2 Outdoor Unit PCBs ................... 35 3 Error Code Table ..................49 4 Troubleshooting ..................52 5 Appendix to Part 4 ................. 110 202008 Midea CAC Confidential...

  • Page 34: Outdoor Unit Electric Control Box Layout

    Mono M thermal Mono 1 Outdoor Unit Electric Control Box Layout KHC-06RY1 Figure 4-1.1: Electric control box front view Main PCB for refrigerant system Main PCB for hydronic system Main PCB for refrigerant system Inverter module terminal blocks 200208 Midea CAC Confidential...
  • Page 35 M thermal Mono Mono KHC-08RY1 / KHC-10RY1 Figure 4-1.2: Electric control box front view Main PCB for refrigerant system Main PCB fort hydronic system Inverter module Outdoor unit power supply terminals Communication terminal blocks 202008 Midea CAC Confidential...
  • Page 36 M thermal Mono Mono KHC-12RY3 / KHC-14RY3 / KHC-16RY3 Figure 4-1.4: Electric control box front view Main PCB for refrigerant system Main PCB for hydronic system Inverter module Outdoor unit power supply Communication terminal blocks terminals 200208 Midea CAC Confidential...

  • Page 37: Outdoor Unit Pcbs

    M thermal Mono Mono 2 Outdoor Unit PCBs 2.1 Types 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 Mono models. The locations of each PCB in the outdoor unit electric control boxes are shown in Figures 4-1.1 to 4-1.4 in Part 4, 1 “Outdoor Unit Electric Control Box Layout”.
  • Page 38 M thermal Mono Mono Table 4-2.1: Main PCB for hydronic system Label in Figure Code Content 4-2.1 CN21 Port for power supply Rotary dip switch DIS1 Digital display Port for ground CN28 Port for internal pump CN25 Port for IC programming S1,S2,S4 Dip switch Port for USB...
  • Page 39 M thermal Mono Mono 2.3 Main PCBs for Refrigerant System, Inverter Modules and filter board KHC-06RY1 / KHC-08RY1 / KHC-10RY1 Figure 4-2.2: KHC-06RY1 / KHC-08RY1 / KHC-10RY1 outdoor unit main PCB for refrigerant system 27 26 25 24 22 21 20...
  • Page 40 M thermal Mono Mono Table 4-2.2: KHC-06RY1 / KHC-08RY1 / KHC-10RY1 outdoor unit main PCB for refrigerant system Label in Figure Code Content 4-2.2 Output port L to MAIN CONTROL BOARD FOR REFRIGERANT SYSTEM CN28 Reserved CN22 Output port N to MAIN CONTROL BOARD FOR REFRIGERANT SYSTEM...
  • Page 41 M thermal Mono Mono Figure 4-2.3: KHC-06RY1 outdoor unit inverter module 202008 Midea CAC Confidential...
  • Page 42 M thermal Mono Mono Figure 4-2.3: KHC-08RY1 / KHC-10RY1 outdoor unit inverter module 200208 Midea CAC Confidential...
  • Page 43 M thermal Mono Mono Table 4-2.3: KHC-06RY1 / KHC-08RY1 / KHC-10RY1 outdoor unit inverter module Label in Code Content Figure 4-2.5 Compressor connection port U Compressor connection port V Compressor connection port W Output port for +12V/5V CN20 Port for fan...
  • Page 44 M thermal Mono Mono KHC-12RY3 / KHC-14RY3 / KHC-16RY3 Figure 4-2.6: KHC-12RY3 / KHC-14RY3 / KHC-16RY3 outdoor unit main PCB for refrigerant system 26 25 24 23 22 21 20 19 18 17 16 15 14 200208 Midea CAC Confidential...
  • Page 45 M thermal Mono Mono Table 4-2.6: KHC-12RY3 / KHC-14RY3 / KHC-16RY3 outdoor unit main PCB for refrigerant system Label in Figure Code Content 4-2.4 Port for GND CN38 Port for 2-way valve 5 CN27 Port for 2-way valve 6 CN20 Port for electric heating tape1 CN10 Port for electric heating tape2...
  • Page 46 M thermal Mono Mono Figure 4-2.7: KHC-12RY3 / KHC-14RY3 / KHC-16RY3 outdoor unit inverter module Table 4-2.7: KHC-12RY3 / KHC-14RY3 / KHC-16RY3 outdoor unit inverter module Label in Code Content Figure 4-2.7 Output port for +15V Compressor connection port W Compressor connection port V Compressor connection port U Power Input port L1...
  • Page 47 M thermal Mono Mono Figure 4-2.8: KHC-12RY3 / KHC-14RY3 / KHC-16RY3 outdoor unit filter board Table 4-2.8: KHC-12RY3 / KHC-14RY3 / KHC-16RY3 outdoor unit filter board Label in Code Content Figure 4-2.8 Power supply L2 CN201 Power supply L3 CN200 Power supply N CN203 Power supply port of 310VDC...
  • Page 48 M thermal Mono Mono 2.4 Digital Display Output Table 4-2.9: 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...

  • Page 49: Error Code Table

    M thermal Mono Mono 3 Error Code Table Table 4-3.1: Error code table Error Serial Content Displayed on Remarks code number Transducer module temperature too high User interface and refrigerant system Contact your local dealer protect main PCB User interface and hydronic system Water flow failure main PCB User interface and refrigerant system...
  • Page 50 M thermal Mono Mono Table continued on next page … Table 4-3.1: Error code table (continued) User interface and refrigerant system Pressure sensor error main PCB Zone 2 water outlet temperature sensor User interface and hydronic system Sensor T1B error main PCB Water side heat exchanger water outlet User interface and hydronic system...
  • Page 51 M thermal Mono Mono 202008 Midea CAC Confidential...

  • Page 52: Troubleshooting

    M thermal Mono Mono 4 Troubleshooting 4.1 Warning Warning  All electrical work must be 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 53 M thermal Mono Mono 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 54 M thermal Mono Mono 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 55 M thermal Mono Mono 4.3 E1 Troubleshooting 4.3.1 Digital display output 4.3.2 Description  Phase sequence error.  Only applies to 3-phase models.  Mono stops running.  Error code is displayed on refrigerant system main control board for refrigerant system and user interface.
  • Page 56 M thermal Mono Mono 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 57 M thermal Mono Mono 4.4 E2 Troubleshooting 4.4.1 Digital display output 4.4.2 Description  Communication error between outdoor unit and user interface.  Mono stops running.  Error code is displayed on hydronic system main control board for refrigerant system and user interface.
  • Page 58 M thermal Mono Mono 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 control board for refrigerant system and electric...
  • Page 59 M thermal Mono Mono 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 60 M thermal Mono Mono 4.5.4 Procedure E3 / E4 / H2 / H3 / Ed / HA / H5 / H9/ Eb / E7 / EC 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...
  • Page 61 M thermal Mono Mono 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 62 M thermal Mono Mono 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 KHC-06(08,10)RY1 outdoor unit refrigerant system main PCB (labeled 12 in Figure 4-2.2 in Part 4, 2.1 “Main PCBs for Refrigerant System, Inverter...
  • Page 63 M thermal Mono Mono 4.7 EE Troubleshooting 4.7.1 Digital display output 4.7.2 Description  Hydronic system EEPROM error.  Mono stops running.  Error code is displayed on hydronic system main control board for refrigerant system and user interface. 4.7.3 Possible causes ...
  • Page 64 M thermal Mono Mono 4.8 F1 Troubleshooting 4.8.1 Digital display output 4.8.2 Description  Low DC bus voltage.  M thermal Mono stops running.  Error code is displayed on hydronic system main control board for refrigerant system and user interface. 4.8.3 Possible causes ...
  • Page 65 M thermal Mono Mono 4.9 HF Troubleshooting 4.9.1 Digital display output 4.9.2 Description  Refrigerant system EEPROM error.  Mono stops running.  Error code is displayed on refrigerant system main control board for refrigerant system and user interface. 4.9.3 Possible causes ...
  • Page 66 M thermal Mono Mono 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.  Mono stops running.  Error code is displayed on hydronic system main PCB, refrigerant system main control board for refrigerant system and user interface.
  • Page 67 M thermal Mono Mono 4.11.2 Description  Communication error between refrigerant system main control chip and the inverter driver chip.  Mono stops running.  Error code H1 is displayed on refrigerant system main control board and user interface. 4.11.3 Possible causes ...
  • Page 68 M thermal Mono Mono 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 69 M thermal Mono Mono 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...
  • Page 70 M thermal Mono Mono 4.13 H7 Troubleshooting 4.13.1 Digital display output 4.13.2 Description  Abnormal main circuit voltage.  Mono stops running.  Error code is displayed on refrigerant system main control board for refrigerant system and user interface. 4.13.3 Possible causes ...
  • Page 71 M thermal Mono Mono 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...
  • Page 72 M thermal Mono Mono 4.14 H8 Troubleshooting 4.14.1 Digital display output 4.14.2 Description  Pressure sensor error.  Mono stops running.  Error code is displayed on refrigerant system main control board for refrigerant system and user interface. 4.14.3 Possible causes ...
  • Page 73 M thermal Mono Mono 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 Mono stops running. When the pressure rises above 0.30MPa, P0 is removed and normal operation resumes.
  • Page 74 M thermal Mono Mono 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 75 M thermal Mono Mono 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 Mono stops running. When the discharge pressure falls below 3.2MPa, P1 is removed and normal operation resumes.
  • Page 76 M thermal Mono Mono 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 77 M thermal Mono Mono 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 (4/6kW models 18A, 8/10kW model 19A, 12/14/16kW single phase model 30A, 12/14/16kW three phase model 14A), the system displays P3 protection and Mono stops running.
  • Page 78 M thermal Mono Mono 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 79 M thermal Mono Mono 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 Mono stops running. When the discharge temperature falls below 95°C , P4 is removed and normal operation resumes.
  • Page 80 M thermal Mono Mono 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 81 M thermal Mono Mono Notes: Discharge pipe temperature sensor connection is port CN8 on the KHC-06(08,10)RY1 outdoor unit refrigerant system main PCB (labeled 15 in Figure 4-2.2 in Part4, 2.3 "Main PCB for Refrigerant System, Inverter Module"). port CN4 on the KHC-12(14,16)RY3 outdoor unit refrigerant system main PCB (labeled 15 in Figure 4-2.4 in Part 4, 2.
  • Page 82 M thermal Mono Mono 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.  Mono stops running.  Error code is displayed on hydronic system main control board for refrigerant system and user interface. 4.19.3 Possible causes ...
  • Page 83 M thermal Mono Mono 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...
  • Page 84 M thermal Mono Mono 4.20 Inverter module Troubleshooting for single-phase models 4.20.1 Digital display output 4.20.2 Description  Inverter module protection.  Split stops running.  Specific error code L0, L1, L2, L4, L5, L8, L9 is displayed on the user interface and the main control board of refrigerant system.
  • Page 85 M thermal Mono Mono The specific error codes can also be obtained from the LED indicators on the inverter module. Table 4-4.2: Errors indicated on LED, single-phase 4~10kW LED301 flashing pattern (GREEN) Corresponding error LED302 is always on (RED) 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...
  • Page 86 M thermal Mono Mono 4.20.5 Principle of DC inverter Inductor Power Bridge Inverter Comp Contactor Capacitor supply rectifier module ressor (220V) ○ ○ ○ ○ ①Contactor is open, the current across the PTC to charge capacitor. After 5 seconds, the contactor closed. ②220-240V AC power supply change to DC power supply after bridge rectifier.
  • Page 87 M thermal Mono Mono 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 compressor is not connected properly Inverter module is damaged Replace the inverter module Compressor has malfunctioned...
  • Page 88 M thermal Mono Mono 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 conductie silica gel on the IPM module, IGBT, diode, Inverter module has overheated brigde rectifer (on the reverse side of the inverter module PCB)
  • Page 89 M thermal Mono Mono 4.20.7 L1/L2 troubleshooting The normal DC voltage between terminals P and N on inverter module is 1.4 time of AC power supply in standby , the DC voltage is 377V when the fan motor is running. If the voltage is lower than 160V, the unit displays L1. If the voltage is higher than 500V, the unit display L2.
  • Page 90 M thermal Mono Mono Notes: If the fan motor is running and the DC voltage between terminals P and N on inverter module declined, Relay on the main control board of outdoor unit is open. When replacing an inverter module, a layer of thermally conductive silica gel should be painted on IPM module (on the reverse side of the inverter module PCB).
  • Page 91 M thermal Mono Mono 4.21 Inverter module Troubleshooting for three-phase models 4.21.1 Digital display output 4.21.2 Description  Inverter module protection or high pressure protection. Mono stops running.  Specific error code L0, L1, L2, L4, L5, L8 , L9 is displayed on the user interface and the refrigerant system main PCB.
  • Page 92 M thermal Mono Mono The specific error codes can also be obtained from the LED indicators LED1/LED2 on the inverter module. Table 4-4.5: Errors indicated on LED for three-phase 12~16kW unit 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...
  • Page 93 M thermal Mono Mono 4.21.6 L0 troubleshooting Situation 1: L0 error appears immediately after the outdoor unit is powered-on Communication wire between refrigerant system main control board for refrigerant Ensure communication wire is connected systemnd inverter module (4 pins) not properly connected properly Inverter module is damaged...
  • Page 94 M thermal Mono Mono 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 95 M thermal Mono Mono 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...
  • Page 96 M thermal Mono Mono 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 97 M thermal Mono Mono 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 830V, the unit displays an L2 error. Refer to Figure4-4.9. Figure 4-4.9: P, N terminals voltage = 540V DC normal...
  • Page 98 M thermal Mono Mono Figure 4-4.10: P N +15V terminal-+15V IC4/5/6PIN12 IC/4/5 PIN13 （ ） ； （ 、 ） +15V Check the +15V circuit according to corresponding wiring diagram. If IC4/5/6PIN12 on inverter module output voltage is not +15V means the inverter module is failed.
  • Page 99 M thermal Mono Mono 4.21.8 L4 troubleshooting(the same as L1/L2) Situation 1: L4 error appears immediately after the outdoor unit is powered-on Replace the inverter PCB Condition 2: L4 error appears after the compressor has been running for a period of time and the compressor speed is over 60rps Compressor is over-current Replace the compressor...
  • Page 100 M thermal Mono Mono 4.22 bH Troubleshooting 4.22.1 Digital display output 4.22.2 Description  PED PCB failure  Split stops running.  Error code is displayed on hydronic box main PCB and user interface. 4.22.3 Possible causes  Power supply problem. ...
  • Page 101 M thermal Mono Mono 4.22.4 Procedure Power supply problem. After 5 minutes power-off interval, Increase the power voltage to the power again observe required range. whether it can be recovered. board broken. Replace PED PCB and power on again. IPM module broken. Replace IPM module and power on again.
  • Page 102 M thermal Mono Mono 4.23 Pb Troubleshooting 4.23.1 Digital display output 4.23.2 Description  Water side heat exchanger anti-freeze protection.  Mono stops running.  Error code is displayed on refrigerant system main control board for refrigerant system and ANTI.FREEZE icon is displayed on user interface.
  • Page 103 M thermal Mono Mono 4.24 Pd Troubleshooting 4.24.1 Digital display output 4.24.2 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 61°C for more than 3 seconds, the system displays Pd protection and Mono stops running.
  • Page 104 M thermal Mono Mono 4.24.4 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 105 M thermal Mono Mono 4.25 PP Troubleshooting 4.25.1 Digital display output 4.25.2 Description  Water side heat exchanger inlet temperature is higher than outlet temperature in heating mode.  Mono stops running.  Error code is displayed on hydronic system main control board for refrigerant system and user interface.
  • Page 106 M thermal Mono Mono 4.25.4 Procedure PP/Hb 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...
  • Page 107 M thermal Mono Mono 4.26 HE Troubleshooting 4.26.1 Digital display output 4.26.2 Description  Communication error between main control board of hydronic module and Ta/room thermostat transfer  Mono stops running.  Error code is displayed on hydronic system main PCB, outdoor unit main PCB and user interface. 4.26.3 Possible causes ...
  • Page 108 M thermal Mono Mono 4.27 Hd Troubleshooting 4.27.1 Digital display output 4.27.2 Description  Communication fault between master unit and slave unit (in parallel)  Mono stops running.  Error code is displayed on hydronic system main PCB, outdoor unit main PCB and user interface.
  • Page 109 M thermal Mono Mono Address code missing or address code setting duplicate Reset address code by another controller Main board fuse is damaged Replace main board 202008 Midea CAC Confidential...
  • Page 110 M thermal Mono Mono 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 111 M thermal Mono Mono 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...

  • Page 112: Appendix To Part 4

    M thermal Mono Mono Table 4-5.3: Water side heat exchanger water inlet / outlet temperature sensor, final 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 113 Mono...
  • Page 114 kaisai.com...

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