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M‐Thermal Split

 

 

   

66 

201909 

Midea M‐Thermal Split Ser

vice Manual 

4.17

 

P4 Troubleshooting 

 

Digital display output 

 

 

 

Description 

 

Discharge temperature protection. 

 

When  the  compressor  the  discharge  temperature  rises  above  115°C,  the  system  displays  P4  protection  and 
M‐Thermal  Split  stops  running.  When  the  discharge  temperature  falls  below  90°C,  P4  is  removed  and  normal 
operation resumes. 

 

Error code is displayed on refrigerant system main PCB and user interface. 

 

 

Possible causes 

 

Temperature sensor error 

 

High pressure side blockage. 

 

Poor condenser heat exchange. 

 

Outdoor unit main PCB damaged. 

 

 

Midea CAC Confidential

Содержание SMK-60/CGN8

Страница 1: ...M Thermal Split Series Commercial Air Conditioners R32 Service Manual Midea CAC Confidential...

Страница 2: ...Thermal Split 201909 1 CONTENTS CONTENTS Part 1 General Information 3 Part 2 Component Layout and Refrigerant Circuits 7 Part 3 Control 15 Part 4 Diagnosis and Troubleshooting 28 Midea CAC Confidentia...

Страница 3: ...M Thermal Split 2 201909 Midea M Thermal Split Service Manual Midea CAC Confidential...

Страница 4: ...M Thermal Split 201909 3 Part 1 General Information Part 1 General Information 1 Unit Capacities 4 2 External Appearance 5 Midea CAC Confidential...

Страница 5: ...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 For examp...

Страница 6: ...nformation 2 External Appearance 2 1 Outdoor Unit Appearance Table 1 2 1 Outdoor unit appearance MHA V4 6 W D2N8 MHA V8 10 W D2N8 2 2 Hydronic Box Appearance Table 1 2 2 Hydronic box appearance SMK 60...

Страница 7: ...M Thermal Split 6 201909 Midea M Thermal Split Service Manual Midea CAC Confidential...

Страница 8: ...01909 7 Part 2 Component Layout and Refrigerant Circuits Part 2 Component Layout and Refrigerant Circuits 1 Layout of Functional Components 8 2 Piping Diagrams 11 3 Refrigerant Flow Diagrams 13 Midea...

Страница 9: ...9 Midea M Thermal Split Service Manual 1 Layout of Functional Components 1 1 Outdoor Unit Layout MHA V4W D2N8 MHA V6W D2N8 Figure 2 1 1 MHA V4 6 W D2N8 top view Figure 2 1 2 MHA V4 6 W D2N8 front view...

Страница 10: ...Thermal Split 201909 9 Part 2 Component Layout and Refrigerant Circuits MHA V8W D2N8 MHA V10W D2N8 Figure 2 1 3 MHA V8 10 W D2N8 top view Figure 2 1 4 MHA V8 10 W D2N8 front view Midea CAC Confidentia...

Страница 11: ...t Service Manual 1 2 Hydronic Box Layout Figure 2 1 5 SMK 60 CGN8 SMK 80 CGN8 oblique view Air purge valve Expansion vessel Safety valve Water flow switch Water pump Manometer Water side heat exchange...

Страница 12: ...lary 6 Filter 14 Solenoid valve Key components 1 Electronic expansion valve EXV Controls refrigerant flow and reduces refrigerant pressure 2 Four way valve Controls refrigerant flow direction Closed i...

Страница 13: ...ge valve Automatically removes air from the water circuit 2 Safety valve Prevents excessive water pressure by opening at 43 5 psi 3 bar and discharging water from the water circuit 3 Expansion vessel...

Страница 14: ...t 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 dur...

Страница 15: ...M Thermal Split 14 201909 Midea M Thermal Split Service Manual Midea CAC Confidential...

Страница 16: ...ntrol Part 3 Control 1 Stop Operation 16 2 Standby Control 16 3 Startup Control 17 4 Normal Operation Control 18 5 Protection Control 20 6 Special Control 23 7 Role of Temperature Sensors in Control F...

Страница 17: ...d to 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 Wh...

Страница 18: ...rtup follows one of two startup programs until the target rotation speed is reached Refer to Figure 3 3 1 Figure 3 3 2 Figure 3 3 1 MHA V4 6 8 10 W D2N8 compressor startup program1 when ambient temper...

Страница 19: ...omponent Wiring diagram label 4 10kW Control functions and states Inverter compressor COMP Compressor startup program selected according to ambient temperature1 DC fan motor FAN Fan run at maximum spe...

Страница 20: ...essors used on 4 10kW models in rotations per second rps is one third of the frequency in Hz of the electrical input to the compressor motor The frequency of the electrical input to the compressor mot...

Страница 21: ...protection control Notes 1 Pc Discharge pressure When the discharge pressure rises above 4 2MPa the system displays P1 protection and the unit stops running When the discharge pressure drops below 3 2...

Страница 22: ...lays EA protection and the unit stops running When the discharge temperature rises to 27 C or higher the compressor enters re start control 5 4 Compressor Current Protection Control This control prote...

Страница 23: ...han 150rpm for more than 20 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...

Страница 24: ...ration in heating and DHW modes Component Wiring diagram label 4 10kW Control functions and states Inverter compressor COMP Runs at oil return operation rotation speed DC fan motor FAN Controlled acco...

Страница 25: ...electric heater TBH On 6 5 Two zones control1 Two zones control function is used to control temperature of each zone separately thus different type radiator will operate at its optimal temperature and...

Страница 26: ...the setting temperature will be changed to 70 automatically and the TBH operate as below T5 69 the TBH is on T5 70 the TBH is off The unit operate in cooling heating mode as the normal logic Common el...

Страница 27: ...tions Figure 3 7 1 Location of the temperature sensors on M Thermal Split systems Notes 1 The names and functions of the temperature sensors labelled 1 to 11 in this figure are detailed in Table 3 7 1...

Страница 28: ...temperature sensor T3 5 Water side heat exchanger refrigerant outlet gas pipe temperature sensor T2B 6 Water side heat exchanger refrigerant outlet liquid pipe temperature sensor T2 7 Water side heat...

Страница 29: ...28 201909 Midea M Thermal Split Service Manual Part 4 Diagnosis and Troubleshooting 1 Electric Control Box Layout 29 2 PCBs 31 3 Error Code Table 39 4 Troubleshooting 41 5 Appendix to Part 4 82 Midea...

Страница 30: ...al Split 201909 29 1 Electric Control Box Layout 1 1 Outdoor Unit Electric Control Box Layout Figure 4 1 1 MHA V4 6 8 10 W D2N8 electric control box Main PCB Inverter module Capacitor Midea CAC Confid...

Страница 31: ...idea M Thermal Split Service Manual 1 2 Hydronic Box Electric Control Box Layout Figure 4 1 2 SMK 60 80 CGN8 Main PCB Transformer Communication terminal blocks Lighting filter board Power supply termi...

Страница 32: ...1 1 in Part 4 1 1 Outdoor Unit Electric Control Box Layout The locations of each PCB in the hydronic box electric control box are shown in Figures 4 1 2 in Part 4 1 2 Hydronic Box Electric Control Box...

Страница 33: ...N16 Port for temperature sensor Ta room temp 15 CN17 Port for internal pump 16 S1 S2 Dip switch 17 CN34 Output port for deforst 18 CN40 Port for anti freeze eletric heating tape internal 19 CN41 Port...

Страница 34: ...ystem Inverter Module Figure 4 2 2 MHA V4 6 8 10 W D2N8 outdoor unit main PCB for refrigerant system1 1 2 3 4 5 6 29 28 27 7 8 9 10 11 12 13 14 15 26 25 24 23 22 21 30 20 19 18 17 16 Notes 1 Label des...

Страница 35: ...p temp sensor 12 CN9 Port for outdoor ambient temp sensor and condenser temp sensor 13 CN1 Port for Th temp sensor 14 CN14 Port for TF temp sensor 15 CN4 Port for pressure sensor 16 CN2 Reserved 17 CN...

Страница 36: ...r unit inverter module Label in Figure 4 2 3 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 9 9V CN20 5 CN19...

Страница 37: ...essor frequency restriction by Discharge temperature 7 Compressor frequency restriction by pressure 6 T3 Condenser temperature C When no decimal point is displayed Temperature is 9 C Actual value valu...

Страница 38: ...temperature C When no decimal point is displayed Temperature is 9 C Actual value value displayed When decimal point is displayed between the two digits Temperature is 10 C Actual value value displaye...

Страница 39: ...wire connecting for Modbus function The rotating coded switch S3 0 F on the main control board of hydraulic module is used for setting the modbus address By default the units have this coded switch po...

Страница 40: ...e and outdoor unit main PCB Sensor Th EA 11 Discharge pipe temperature sensor error User interface and outdoor unit main PCB Sensor Tp Ed 14 Water side heat exchanger water inlet temperature sensor er...

Страница 41: ...2 L4 L5 L7 L8 or L9 occur L0 Inverter module protection Outdoor unit main PCB L1 DC bus low voltage protection Outdoor unit main PCB L2 DC bus high voltage protection Outdoor unit main PCB L4 MCE erro...

Страница 42: ...ce 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 before connecti...

Страница 43: ...8 has displayed 3 times When an E0 error occurs a manual system restart is required before the system can resume operation M Thermal Split stops running Error code is displayed on hydronic box main PC...

Страница 44: ...or pump can t work Yes Turn off the power check the pump step 1 revolve the pump shaft reversely around the clock by hand if can t revolve replace the pump step 2 check the wire in the pump Once that...

Страница 45: ...displayed on hydronic box main PCB and user interface Possible causes Communication wires between hydronic box and user interface not connected properly Communication wiring X Y E terminals misconnec...

Страница 46: ...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 fluorescent lamp Yes Remove the sou...

Страница 47: ...cates a water side heat exchanger refrigerant inlet liquid pipe temperature sensor error Ed indicates a water side heat exchanger water inlet temperature sensor error HA indicates a water side heat ex...

Страница 48: ...PCB labeled 11 in Figure 4 2 1 in Part4 2 2 Main PCB for Hydronic System Domestic hot water tank temperature sensor connection is port CN13 on the hydronic box main PCB labeled 12 in Figure 4 2 1 in P...

Страница 49: ...ensor error E6 indicates an outdoor ambient temperature sensor error E9 indicates a suction pipe temperature sensor error EA indicates a discharge temperature sensor error M Thermal Split stops runnin...

Страница 50: ...t System Inverter Module Discharge pipe temperature sensor connection is port CN8 on the refrigerant system main PCBs labeled 11 in Figure 4 2 2 in Part4 2 3 Main PCBs for Refrigerant System Inverter...

Страница 51: ...er interface Possible causes Hydronic box main PCB EEPROM is not connected properly Hydronic box main PCB damaged Procedure EE Hydronic box main PCB EEPROM1 is not connected properly Yes Ensure the EE...

Страница 52: ...PCB and user interface Possible causes The DC generatrix voltage is too low Procedure F1 Power supply is abnormal Yes Provide normal power No LED on the Inverter Modules is lighting Yes Voltage of PN...

Страница 53: ...ser interface Possible causes Outdoor unit main PCB EEPROM is not connected properly Outdoor unit main PCB damaged Procedure HF Outdoor unit EEPROM1 is not connected properly Yes Ensure the EEPROM is...

Страница 54: ...hydronic box M Thermal Split stops running Error code is displayed on hydronic box main PCB outdoor unit main PCB and user interface Possible causes Power supply abnormal Transformer malfunction Inter...

Страница 55: ...wires P Q E between main control board of outdoor unit and hydraulic module have short circuited disconnected or misconnected Yes Reconnect the communication wires No Replace outdoor unit main PCB and...

Страница 56: ...verter driven module damaged Procedure H1 LED on the main control board of outdoor unit and inverter module are light Yes LED is not light the board is damaged or have short circuit No Communicatin wi...

Страница 57: ...HH error occurs a manual system restart is required before the system can resume operation The cause of HH error should be addressed promptly in order to avoid system damage M Thermal Split stops runn...

Страница 58: ...Control Box Layout and to the M Thermal Split Engineering Data Book Part 2 5 Wiring Diagrams 2 Only applies to single phase power supply models Check the voltage between and terminals on the PFC modu...

Страница 59: ...rmal Split stops running Error code is displayed on outdoor unit main PCB and user interface Possible causes Power supply voltage not within 90 110 of rated voltage Outdoor unit main PCB is damaged Pr...

Страница 60: ...connection on outdoor unit 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 outdoor unit main PCB...

Страница 61: ...and normal operation resumes HP indicates 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...

Страница 62: ...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 and compressor cur...

Страница 63: ...ion and M Thermal Split stops running When the discharge pressure falls below 3 2MPa P1 is removed and normal operation resumes Error code is displayed on outdoor unit main PCB and user interface Poss...

Страница 64: ...for Refrigerant System Inverter Module Pressure sensor connectin is port CN4 on the main control board of outdoor unit labeled 15 in Figure 4 2 2 in Part4 2 3 Main PCBs for Refrigerant System Inverte...

Страница 65: ...ls 18A 8 10kW model 19A the system displays P3 protection and M Thermal Split stops running When the current returns to the normal range P3 is removed and normal operation resumes Error code is displa...

Страница 66: ...water flow switch for dirt blockages In cooling mode check air side heat exchanger fan and air outlets for dirt blockages 2 High pressure side blockage causes discharge temperature to be higher than n...

Страница 67: ...rises above 115 C the system displays P4 protection and M Thermal Split stops running When the discharge temperature falls below 90 C P4 is removed and normal operation resumes Error code is displayed...

Страница 68: ...sure switch connection or pressure sensor connection on outdoor unit main PCB is loose4 Yes Ensure the pressure switch is connected properly No Pressure sensor has short circuited or failed5 Yes Repla...

Страница 69: ...ponents and to Table 5 5 1 or 5 5 2 in Part 5 5 1 Temperature Sensor Resistance Characteristics 4 High pressure switch connection is port CN13 on the main PCB labeled 10 in Figure 4 2 2 in Part4 2 3 M...

Страница 70: ...hanger water inlet and water outlet temperatures protection M Thermal Split stops running Error code is displayed on hydronic box main PCB and user interface Possible causes Temperature sensor not con...

Страница 71: ...PCB Notes 1 Water side heat exchanger water inlet temperature sensor and water side heat exchanger water outlet temperature sensor connections are port CN6 on the hydronic box main PCB labeled11 in F...

Страница 72: ...If a P6 error code is displayed on the user interface one of the following specific error codes is displayed on the outdoor unit main PCB L0 L1 L2 L4 L5 L7 L8 L9 Refer to Table 4 4 1 Table 4 4 1 Speci...

Страница 73: ...dge rectifier Contactor is open the current across the PTC to charge capacitor after 5 seconds the contactor closed The capacitor output steady power supply for inverter module P N terminals In standb...

Страница 74: ...module to the correct compressor terminals as indicated by the labels on the compressor 2 Measure the resistance between each of U V and W and each of P and N on the inverter module All the resistance...

Страница 75: ...e the compressor No Replace the inverter module3 Notes 1 Refer to Figure 4 4 1 2 Use clip on ammeter to measure the compressor current if the current is normal indicates the inverter module is failed...

Страница 76: ...er module terminals U V W N P Situation 1 L1 or L2 error 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 returne...

Страница 77: ...es Replace the outdoor unit main PCB No Replace the inverter module2 Notes 1 If the fan motor is running and the DC voltage between terminals P and N on inverter module declined Relay on the main cont...

Страница 78: ...heat exchanger water outlet temperature sensor water inlet temperature sensor or backup electric heater outlet water temperature sensor has short circuited or failed3 Yes Replace the temperature senso...

Страница 79: ...r more than 3 seconds the system displays Pd protection and M Thermal Split stops running When the air side heat exchanger refrigerant outlet temperature returns drops below 52 C Pd is removed and nor...

Страница 80: ...eplace outdoor main PCB Notes 1 Air side heat exchanger refrigerant outlet temperature sensor and outdoor ambient temperature sensor connection port are CN9 on the outdoor unit main PCB labeled 12 in...

Страница 81: ...rature is higher than outlet temperature in heating mode M Thermal Split stops running Error code is displayed on hydronic box main PCB and user interface Hb indicates PP has displayed 3 times Possibl...

Страница 82: ...side heat exchanger water outlet temperature sensor connections are port CN6 on the hydronic box main PCB labeled 11 in Figure 4 2 1 in Part4 2 2 Main PCB for Hydronic System 2 Measure sensor resistan...

Страница 83: ...8 71 31 7 624 71 1 591 111 0 4596 8 56 37 32 7 295 72 1 537 112 0 4470 7 52 24 33 6 981 73 1 485 113 0 4348 6 49 32 34 6 684 74 1 435 114 0 4230 5 46 57 35 6 400 75 1 387 115 0 4116 4 44 00 36 6 131 7...

Страница 84: ...3 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...

Страница 85: ...69 20 61 535 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 1...

Страница 86: ...Avenue Shunde Foshan Guangdong China Postal code 528311 Tel 86 757 26338346 Fax 86 757 22390205 cac midea com global midea com Note Product specifications change from time to time as product improvem...

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