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M thermal Mono

202008

Midea

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rvice M

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Midea CAC Confidential

M thermal Mono

202008

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

Midea CAC Confidential

Mono

Содержание 06RY1

Страница 1: ...SERVICEMANUAL MONO TYPE HEAT PUMP R32...

Страница 2: ...Mono...

Страница 3: ...ermal Mono 202008 1 CONTENTS CONTENTS Part 1 General Information 3 Part 2 Component Layout and Refrigerant Circuits 5 Part 3 Control 15 Part 4 Diagnosis and Troubleshooting 31 Midea CAC Confidential M...

Страница 4: ...M thermal Mono 2 202008 Midea M thermal Mono Service Manual Midea CAC Confidential Mono...

Страница 5: ...M thermal Mono 202008 3 Part 1 General Information Part 1 General Information 1 Unit Capacities and External Appearance 4 Midea CAC Confidential Mono...

Страница 6: ...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 For example the model name for the 8kW...

Страница 7: ...08 5 Part 2 Component Layout and Refrigerant Circuits Part 2 Component Layout and Refrigerant Circuits 1 Layout of Functional Components 6 2 Piping Diagrams 11 3 Refrigerant Flow Diagrams 13 Midea CAC...

Страница 8: ...M thermal Mono 6 202008 Midea M thermal Mono Service Manual 1 Layout of Functional Components KHC 06RY1 Figure 2 1 1 KHC 06RY1 top view Figure 2 1 2 KHC 06RY1 front view Midea CAC Confidential Mono...

Страница 9: ...M thermal Mono 202008 7 Part 2 Component Layout and Refrigerant Circuits Figure 2 1 3 KHC 06RY1 Midea CAC Confidential Mono...

Страница 10: ...M thermal Mono 8 202008 Midea M thermal Mono Service Manual KHC 08RY1 KHC 10RY1 Figure 2 1 1 KHC 08 10 RY1 top view Midea CAC Confidential Mono...

Страница 11: ...M thermal Mono 202008 9 Midea CAC Confidential Figure 2 1 2 KHC 08 10 RY1 front view Part 2 Component Layout and Refrigerant Circuits Mono...

Страница 12: ...M thermal Mono 10 202008 Midea M thermal Mono Service Manual Figure 2 1 5 KHC 12 14 16 RY3 front view Midea CAC Confidential KHC 12RY3 KHC 14RY3 KHC 16RY3 Figure 2 1 4 KHC 12 14 16 RY3 top view Mono...

Страница 13: ...p Flow switch High pressure switch Expansion vessel Manometer Single way solenoid valve Capillary Discharge temp sensor DC motor T4 T3 Filter Suction temp sensor Filter Low pressure switch F d e s c C...

Страница 14: ...erant system pressure When refrigerant system pressure rises above the upper limit or falls below the lower limit the high or low pressure switches turn off stopping the compressor 5 Air purge valve A...

Страница 15: ...iagrams 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 Figur...

Страница 16: ...M thermal Mono 14 202008 Midea M thermal Mono Service Manual Midea CAC Confidential Mono...

Страница 17: ...ol 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 Func...

Страница 18: ...prevent refrigerant from mixing with compressor oil when the compressors are stopped The crankcase heater is controlled according to outdoor ambient temperature and the compressor on off state When t...

Страница 19: ...MODE SETTING Menu and Part 3 7 6 HEAT MODE SETTING Menu 3 2 Compressor Startup Program In initial startup control and in re start control compressor startup is controlled according to outdoor ambient...

Страница 20: ...FAN Fan runs at maximum speed 2 Electronic expansion valve EXV Position steps from 0 fully closed to 480 fully open controlled according to outdoor ambient temperature discharge temperature and suctio...

Страница 21: ...EXV Position steps from 0 fully closed to 480 fully open controlled according to discharge temperature suction superheat and compressor speed Four way valve ST Off 4 2 Compressor Output Control The co...

Страница 22: ...operating mode and outdoor ambient temperature After a further a few minutes the EXV is controlled according to suction superheat and discharge temperature Once a further a few minutes have elapsed th...

Страница 23: ...the compressor from transient spikes in pressure Figure 3 5 1 High pressure protection control Notes 1 Pc Discharge pressure When the discharge pressure rises above 4 3MPa the system displays P1 prote...

Страница 24: ...n temperature the compressor enters re start control 5 4 Compressor Current Protection Control This control protects the compressor from abnormally high currents Figure 3 5 5 Compressor current protec...

Страница 25: ...150rpm for more than 90 seconds When DC fan motor protection control occurs the system displays the H6 error code and the unit stops running After 3 minutes the unit restarts automatically When H6 pro...

Страница 26: ...Control When the module temperature rises at or above Tf2 the system displays C7 protection and the unit stops running When the module temperature drops at or below Tf0 1 the compressor enters re sta...

Страница 27: ...e EXV 304 steps Four way valve ST Off Tables 3 6 2 show component control during oil return operation in heating and DHW modes Table 3 6 2 Outdoor unit component control during oil return operation in...

Страница 28: ...n two zones control for cooling mode when the setting temperature of a certain zones is reached the zone and water pump of this zone will turn off In two zones control for heating mode the on off cont...

Страница 29: ...eds at the same time Balance tank can store energy to provide hot water whilst heat pump runs heat mode cooling which can reduce the host selection and the initial investment 6 7 USB data transfer Con...

Страница 30: ...ture Sensors in Control Functions Figure 3 7 1 Location of the temperature sensors on 6 16KW unit systems Notes 1 The names and functions of the temperature sensors labelled 1 to 12 in this figure are...

Страница 31: ...ide heat exchanger water outlet temperature sensor Tw_out Heating Compressor output5 and on off control6 Freeze prevention control10 Cooling DHW 9 Backup electric heater water outlet temperature senso...

Страница 32: ...M thermal Mono 30 202008 Midea M thermal Mono Service Manual Midea CAC Confidential Mono...

Страница 33: ...o 202008 31 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 Midea CAC Conf...

Страница 34: ...nual 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 Inve...

Страница 35: ...RY1 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 bloc...

Страница 36: ...Manual Midea CAC Confidential 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 terminals Communicati...

Страница 37: ...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 2 2 Main PCB f...

Страница 38: ...wer port for room thermostat COM 18 CN35 Port for smart grid grid signal photovoltaic signal 19 CN36 Port for remote switch temperature board 20 CN19 Communicate port between indoor unit and outdoor u...

Страница 39: ...stem 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 4 5 6 7 8 9 10 3 2 1 11 12 13 14 15 16 17 1...

Страница 40: ...CN10 Input port for neutral wire 11 CN11 Input port for live wire 12 CN9 Port for outdoor ambient temp sensor and condenser temp sensor 13 CN24 Input port for 12V 9V 14 CN1 Port for suction temp sens...

Страница 41: ...M thermal Mono 202008 39 Figure 4 2 3 KHC 06RY1 outdoor unit inverter module 1 2 3 8 7 4 5 6 9 Midea CAC Confidential Mono...

Страница 42: ...M thermal Mono 40 200208 Midea M thermal Mono Service Manual Figure 4 2 3 KHC 08RY1 KHC 10RY1 outdoor unit inverter module 1 2 3 8 7 4 5 6 9 Midea CAC Confidential Mono...

Страница 43: ...Figure 4 2 5 Code Content 1 U Compressor connection port U 2 V Compressor connection port V 3 W Compressor connection port W 4 CN20 Output port for 12V 5V 5 CN19 Port for fan 6 CN32 Port for communic...

Страница 44: ...Service Manual KHC 12RY3 KHC 14RY3 KHC 16RY3 Figure 4 2 6 KHC 12RY3 KHC 14RY3 KHC 16RY3 outdoor unit main PCB for refrigerant system 1 1 2 3 4 5 6 7 8 3 2 1 9 10 11 12 13 28 27 26 25 24 23 22 21 20 1...

Страница 45: ...tion with INVERT MODULE BOARD 13 CN6 Port for pressure sensor 14 CN36 Port for communication with MAIN CONTROL BOARD FOR REFRIGERANT SYSTEM CN36 15 CN4 Port for temp sensor Tp CN4 16 CN8 Port for temp...

Страница 46: ...4 Output port for 15V 2 W Compressor connection port W 3 V Compressor connection port V 4 U Compressor connection port U 5 L1 Power Input port L1 6 L2 Power Input port L2 7 P_out Input port P_out for...

Страница 47: ...2 CN200 Power supply L3 3 CN203 Power supply N 4 CN212 Power supply port of 310VDC 5 CN211 Power supply port for load 6 CN213 Port for FAN Reactor 7 CN214 Power supply port for Inverter module 8 PE3 G...

Страница 48: ...per second Error or protection Error or protection code Error or protection code 2 5 DIP Switch Settings Modbus function will be available in 2020 5 30 The rotating coded switch S3 0 F on the main con...

Страница 49: ...sor Th EA 11 Discharge pipe temperature sensor error User interface and refrigerant system main PCB Sensor Tp Ed 14 Water side heat exchanger water inlet temperature sensor error User interface and hy...

Страница 50: ...Inverter module protection Refrigerant system main PCB L1 DC bus low voltage protection Refrigerant system main PCB L2 DC bus high voltage protection Refrigerant system main PCB L4 MCE error Refrigera...

Страница 51: ...M thermal Mono 202008 51 Midea CAC Confidential Mono...

Страница 52: ...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 Power off the outdoor units...

Страница 53: ...E0 error occurs a manual system restart is required before the system can resume operation Mono stops running Error code is displayed on hydronic system main control board for refrigerant system and...

Страница 54: ...switch is damaged Yes Replace the water flow switch No Internal circulator pump fuse backup electric heater fuse or hydronic system main PCB fuse has blown3 Yes Replace the blown fuse No Replace hydro...

Страница 55: ...pplies to 3 phase models Mono stops running Error code is displayed on refrigerant system main control board for refrigerant system and user interface Possible causes 4 3 3 Power supply phases not con...

Страница 56: ...ments If the phase sequence is inverted the compressor will operate inversely If the wiring connection of each outdoor unit is in A B C phase sequence and multiple units are connected the current diff...

Страница 57: ...board for refrigerant system and user interface Possible causes 4 4 3 Communication wires between outdoor unit and user interface not connected properly Communication wiring X Y E terminals misconnec...

Страница 58: ...0V or higher wires Yes Ensure the communication wires and high voltage wires are separated No Communication wires are close to a source of electromagnetic radiation such as transformer or strong fluor...

Страница 59: ...heat exchanger water inlet temperature sensor error HA indicates a water side heat exchanger water outlet temperature sensor error H5 indicates a room temperature sensor error H9 indicates a zone 2 w...

Страница 60: ...the hydronic system main PCB labeled 8 in Figure 4 2 1 in Part 4 2 2 Main PCB for Hydronic System Domestic hot water tank temperature sensor connection is port CN13 on the hydronic system main PCB la...

Страница 61: ...ambient temperature sensor error E9 indicates a suction pipe temperature sensor error EA indicates a discharge temperature sensor error Mono stops running Error code is displayed on refrigerant syste...

Страница 62: ...rt CN8 on the KHC 06 08 10 RY1 outdoor unit refrigerant system main PCB labeled 15 in Figure 4 2 2 in Part 4 2 1 Main PCBs for Refrigerant System Inverter Module port CN4 on the KHC 12 14 16 RY3 outdo...

Страница 63: ...ssible causes 4 7 3 Hydronic system main PCB EEPROM is not connected properly Hydronic system main PCB damaged Procedure 4 7 4 EE Hydronic system EEPROM1 is not connected properly Yes Ensure the EEPRO...

Страница 64: ...system main control board for refrigerant system and user interface Possible causes 4 8 3 The DC bus voltage is too low Procedure 4 8 4 F1 Power supply is abnormal Yes Provide normal power No LED ligh...

Страница 65: ...rly Yes Ensure the EEPROM is connected properly No Replace refrigerant system main PCB Notes 1 Refrigerant system main PCB EEPROM is designated IC23 on the refrigerant system main PCBs labeled 29 in F...

Страница 66: ...er supply No A transformer has malfunctioned2 Yes Replace the transformer No There is a source of electromagnetic radiation near the unit such as high frequency transmitter or other high strength radi...

Страница 67: ...er has malfunctioned2 Yes Replace the transformer No There is a source of electromagnetic radiation near the unit such as high frequency transmitter or other high strength radiation device Yes Remove...

Страница 68: ...uired before the system can resume operation The cause of an HH error should be addressed promptly in order to avoid system damage Mono stops running Error code is displayed on refrigerant system main...

Страница 69: ...ain PCB Notes 1 Refer to Figures 4 1 1 to 4 1 7 in Part 4 1 Outdoor Unit Electric Control Box Layout and to the Mono Engineering Data Book Part 2 5 Wiring Diagrams 2 Only applies to single phase power...

Страница 70: ...g Error code is displayed on refrigerant system main control board for refrigerant system and user interface Possible causes 4 13 3 Power supply voltage not within 10 of rated voltage or a phase is mi...

Страница 71: ...er supply terminals are loose Yes Ensure the wires are connected properly No Outdoor unit powered on immediately after being powered off Yes Power off the unit and wait for at least 3 minutes before p...

Страница 72: ...on refrigerant system main PCB is loose Yes Ensure the sensor is connected properly No High pressure sensor has short circuited or failed1 Yes Replace the sensor No Replace refrigerant system main PCB...

Страница 73: ...cates P0 protection has occurred 3 times in 60 minutes When an HP error occurs a manual system restart is required before the system can resume operation Error code is displayed on refrigerant system...

Страница 74: ...Notes 1 To check for insufficient refrigerant An insufficiency of refrigerant causes compressor discharge temperature to be higher than normal discharge and suction pressures to be lower than normal a...

Страница 75: ...When the discharge pressure falls below 3 2MPa P1 is removed and normal operation resumes Error code is displayed on refrigerant system main control board for refrigerant system and user interface Po...

Страница 76: ...e MHA V12 14 16 W D2N8 B outdoor unit refrigerant system main PCB labeled 16 in Figure 4 2 3 in Part 4 2 3 Main PCB for Refrigerant System Inverter Module port CN31 on the KHC 12 14 16 RY3 outdoor uni...

Страница 77: ...W three phase model 14A the system displays P3 protection and Mono stops running When the current returns to the normal range P3 is removed and normal operation resumes Error code is displayed on refr...

Страница 78: ...e heat exchanger water piping circulator pumps and water flow switch for dirt blockages In cooling mode check air side heat exchanger fan s and air outlets for dirt blockages 2 High pressure side bloc...

Страница 79: ...ystem displays P4 protection and Mono stops running When the discharge temperature falls below 95 C P4 is removed and normal operation resumes Error code is displayed on refrigerant system main contro...

Страница 80: ...perly No Temperature sensor has short circuited or failed3 Yes Replace the sensor No High pressure switch connection or pressure sensor connection on refrigerant system main PCB is loose4 Yes Ensure t...

Страница 81: ...th the sensor s resistance characteristics table the sensor has failed Refer to Part 2 1 Layout of Functional Components and to Table 5 5 1 or 5 5 2 in Part 5 5 1 Temperature Sensor Resistance Charact...

Страница 82: ...t 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 Possible cau...

Страница 83: ...iping or broken expansion vessel Yes Inspect the system and fix the error No Replace outdoor main PCB Notes 1 Water side heat exchanger water inlet temperature sensor and water side heat exchanger wat...

Страница 84: ...ection Zero speed protection Excessive compressor frequency variation Actual compressor frequency differs from target frequency High pressure protection PED board self checking fail Specific error cod...

Страница 85: ...ection Table 4 4 3 Errors indicated on LED single phase 4 10kW LED1 flashing pattern GREEN LED2 is always on RED Corresponding error Flashes 3 times and stops for 1 second then repeats P1 High pressur...

Страница 86: ...erter module is damaged1 Yes Replace the inverter module2 Notes 1 Measure the resistance between each of U V and W and each of P and N on the inverter module All the resistances should be infinite If...

Страница 87: ...tance between each of U V and W and each of P and N on the inverter module All the resistances should be infinite If any of them are not infinite the inverter module is damaged and should be replaced...

Страница 88: ...e compressor No Replace the inverter module3 Notes 1 Refer to Figure 4 4 2 2 Use clip on ammeter to measure the compressor current if the current is normal indicates the inverter module is failed if t...

Страница 89: ...appears immediately after the outdoor unit is powered on L1 L2 Power supply is abnormal Yes Re start the unit once the power supply has returned to normal No Replace the inverter module1 Notes 1 When...

Страница 90: ...le PCB Refer to Figure 4 4 2 Figure 4 4 4 Relay location of main PCB for refrigerant system Single phase 4 6 8 10kW unit Single phase 12 14 16kW unit Relay L5 L8 L9 troubleshooting 4 20 8 L5 L8 L9 The...

Страница 91: ...rotection Excessive compressor frequency variation Actual compressor frequency differs from target frequency High pressure protection Contactor stuck or 908 self checking fail Specific error codes for...

Страница 92: ...rotection Flashes 17 times and stops for 1 second then repeats L8 Compressor frequency variation greater than 15Hz within one second protection L9 Actual compressor frequency differs from target frequ...

Страница 93: ...port between refrigerant system main control board for refrigerant system inverter module is port CN36 on refrigerant system main control board for refrigerant system port CN8 on inverter module 2 Mea...

Страница 94: ...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 Refer to Fig...

Страница 95: ...wire from the inverter module to the correct compressor terminals as indicated by the labels on the compressor 2 Measure the voltage between each of W W V V U U and GND when the unit is in standby The...

Страница 96: ...Yes Replace the compressor No Replace the inverter module2 Notes 1 When replacing an inverter module a layer of thermally conductive silica gel should be painted on the IPM module on the reverse side...

Страница 97: ...or unit is powered on L1 L2 P N 15V wire on refrigerant system main PCB is not connected properly1 Yes Ensure P N 15V wire is connected properly No Voltage between N and 15 is abnormal2 Yes Check 15V...

Страница 98: ...Put the red probe on the DC power output negative terminal terminal 5 and put the black probe onto each of the AC power input terminals terminals 1 2 and 3 in turn The voltage between terminal 5 and...

Страница 99: ...is over current2 Yes Replace the compressor No Replace the inverter PCB Notes 1 Re start the unit use clip on ammeter to measure the compressor current if the current is normal indicates the compresso...

Страница 100: ...ubleshooting Digital display output 4 22 1 Description 4 22 2 PED PCB failure Split stops running Error code is displayed on hydronic box main PCB and user interface Possible causes 4 22 3 Power suppl...

Страница 101: ...an be recovered Yes Increase the power voltage to the required range No PED1 board broken Yes Replace PED PCB and power on again No IPM module broken Yes Replace IPM module and power on again Notes 1...

Страница 102: ...r is connected properly No Water side heat exchanger water outlet temperature sensor water inlet temperature sensor or backup electric heater outlet water temperature sensor has short circuited or fai...

Страница 103: ...stem displays Pd protection and Mono stops running When the air side heat exchanger refrigerant outlet temperature returns drops below 55 C Pd is removed and normal operation resumes Mono stops runnin...

Страница 104: ...nt 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...

Страница 105: ...ture in heating mode Mono stops running Error code is displayed on hydronic system main control board for refrigerant system and user interface If PP error occurs 3 times then Hb will appear Possible...

Страница 106: ...nsor and water side heat exchanger water outlet temperature sensor connections are port CN6 on the hydronic system main PCB labeled 8 in Figure 4 2 1 in Part 4 2 2 Min PCB for Hydronic System 2 Measur...

Страница 107: ...n hydronic system main PCB outdoor unit main PCB and user interface Possible causes 4 26 3 Temperature collecting plate Optional connection wire is not connected Temperature collecting plate Optional...

Страница 108: ...licate Main board fuse is damaged Procedure 4 27 4 Hd SW9 DIP switch with wrong settings Yes Check SW9 setting Master unit ON Slave unit OFF No More than two units are connected to the wire controller...

Страница 109: ...rmal Mono 202008 109 No Address code missing or address code setting duplicate Yes Reset address code by another controller No Main board fuse is damaged Yes Replace main board Midea CAC Confidential...

Страница 110: ...18 94 769 22 11 496 62 2 181 102 0 574 17 89 353 23 10 971 63 2 102 103 0 558 16 84 278 24 10 473 64 2 026 104 0 542 15 79 521 25 10 65 1 953 105 0 527 14 75 059 26 9 551 66 1 883 13 70 873 27 9 125...

Страница 111: ...38 89 73 8 643 113 2 559 6 247 8 34 37 30 74 8 358 114 2 489 5 234 9 35 35 78 75 8 084 115 2 422 4 222 8 36 34 32 76 7 820 116 2 357 3 211 4 37 32 94 77 7 566 117 2 294 2 200 7 38 31 62 78 7 321 118 2...

Страница 112: ...5 60 12 144 100 3 2734 19 450 81 21 58 804 61 11 715 101 3 1777 18 425 59 22 56 209 62 11 302 102 3 0853 17 401 91 23 53 742 63 10 906 103 2 9960 16 379 69 24 51 396 64 10 526 104 2 9096 15 358 83 25...

Страница 113: ...Mono...

Страница 114: ...kaisai com...

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