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Midea MV6-R252WV2GN1, Service Manual

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Midea MV6-R252WV2GN1 Service Manual Download Page 112

 

 

  V6R VRF 50/60Hz

 

 

 

111 

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L5: Zero speed protection 

There is abnormal noise of compressor 
when startup or running

Replace the compressor

No

Yes

Replace the inverter module

L5 Fault

Disconnect the 
power supply

 

 

 

L5 Protection 

Summary of Contents for MV6-R252WV2GN1

Page 1: ...Commercial Air Conditioners R410A Service Manual MV6 R252WV2GN1 MV6 R280WV2GN1 MV6 R335WV2GN1 MV6 R400WV2GN1 MV6 R450WV2GN1 MV6 R500WV2GN1 MV6 R560WV2GN1 Series VRF...

Page 2: ...CONTENTS Part 1 General Information 3 Part 2 Component Layout and Refrigerant Circuits 13 Part 3 Control 25 Part 4 Field Settings 51 Part 5 Electrical Components and Wiring Diagrams 57 Part 6 Diagnos...

Page 3: ...V6R VRF 50 60Hz 2 Midea V6R Series Service Manual...

Page 4: ...V6R VRF 50 60Hz 3 Part 1 General Information Part 1 General Information 1 Indoor and Outdoor Unit Capacities 4 2 External Appearance 5 3 Outdoor Unit Combinations 10 4 Combination Ratio 11...

Page 5: ...ty Capacity index Q1 Q2 Q4C Q4 T2 T1 G DL F Z kW kBtu h HP 1 8 5 0 6 18 18 2 2 7 0 8 22 22 22 22 22 22 22 22 2 8 9 1 28 28 28 28 28 28 28 28 28 3 6 12 1 25 36 36 36 36 36 36 36 36 36 36 4 5 15 1 6 45...

Page 6: ...l Name Combination Type 8HP MV6 R252WV2GN1 10HP MV6 R280WV2GN1 12HP MV6 R335WV2GN1 14HP MV6 R400WV2GN1 16HP MV6 R450WV2GN1 18HP MV6 R500WV2GN1 20HP MV6 R560WV2GN1 22HP MV6 R615WV2GN1 12HP 10HP 24HP MV...

Page 7: ...e One way Cassette Two way Cassette Q1 Q2 Compact Four way Cassette Four way Cassette Q4C Q4 Medium Static Pressure Duct High Static Pressure Duct T2 T1 Wall mounted Ceiling Floor G DL Floor Standing...

Page 8: ...Information 2 2 Heat Recovery Ventilator Table 1 2 3 Heat recovery ventilator appearance Heat Recovery Ventilator 2 3 High Temperature Hydro Module Table 1 2 4 High temperature Hydro module appearanc...

Page 9: ...ts 2 4 1 Single units Table 1 2 5 Single outdoor unit appearance 8 10 12HP with single fan 14 16 18 20HP with dual fan 2 4 2 Combinations of units Table 1 2 6 Combination outdoor unit appearance 22HP...

Page 10: ...el name Appearance Max number of downstream indoor units MS01 N1 D1 2 8 MS04 N1 D 20 MS06 N1 D 30 MS08 N1 D 40 MS10 N1 D 47 MS12 N1 D 47 Notes 1 MS01 can be ceiling suspended installed and wall mounte...

Page 11: ...1 56 0 20 1 61 5 22 2 FQZHW 02SB1 68 0 24 2 73 5 26 2 78 5 28 2 83 5 30 2 90 0 32 2 95 0 34 2 100 0 36 2 106 0 38 2 112 0 40 2 118 5 42 3 FQZHW 03SB1 123 5 44 3 130 0 46 3 135 0 48 3 140 0 50 3 145 0...

Page 12: ...VRF indoor unit and 2nd generation AC VRF indoor units which will be released soon 2 When HT hydro module units are installed together with VRF indoor units the total capacity of HT hydro module unit...

Page 13: ...1020 5 392 5 to 1570 392 5 to 785 392 5 to 785 83 5 30 835 417 5 to 1085 5 417 5 to 1670 417 5 to 835 417 5 to 835 90 32 900 450 to 1170 450 to 1800 450 to 900 450 to 900 95 34 950 475 to 1235 475 to...

Page 14: ...VRF 50 60Hz 13 Part 2 Component Layout and Refrigerant Circuits Part 2 Component Layout and Refrigerant Circuits 1 Layout of Functional Components 14 2 Piping Diagrams 16 3 Refrigerant Flow Diagrams...

Page 15: ...pansion valve EEVC 5 Stop valve liquid side 6 Stop valve high pressure gas side 7 Stop valve low pressure gas side 8 Refrigerant charge solenoid valve SVC customization option 9 Electronic expansion v...

Page 16: ...on valve EEVC 5 Stop valve liquid side 6 Stop valve high pressure gas side 7 Stop valve low pressure gas side 8 Electronic expansion valve EEVA 9 High pressure sensor 10 Hot gas bypass solenoid valve...

Page 17: ...ption 7 Stop valve low pressure gas side T3 Heat exchanger deicer temperature sensor 8 Refrigerant charge solenoid valve SVC customization option T4 Outdoor air temperature sensor 9 Electronic expansi...

Page 18: ...Sensor Code Description 7 Stop valve low pressure gas side T3 Heat exchanger deicer temperature sensor 8 Electronic expansion valve EEVA T4 Outdoor air temperature sensor 9 High pressure sensor T5 Liq...

Page 19: ...efrigerant comes from the plate heat exchanger going to the compressor can enhance the refrigerant enthalpy and improve the heating capacity in low ambient temperature Refrigerant volume in plate heat...

Page 20: ...cooling operation EXV EVAP T2b T1 T2 EXV EVAP T2b T1 T2 EXV EVAP T2b T1 T2 EXV T2b T1 T2 T7C1 T3 TL T9 T8 T6A T6B T7 E S C EXVA T5 T4 Cooling M ode Therm o ON Cooling M ode Therm o ON Cooling M ode T...

Page 21: ...EXV EVAP T2b T1 T2 EXV EVAP T2b T1 T2 EXV EVAP T2b T1 T2 EXV COND T2b T1 T2 T7C1 T3 TL T9 T8 T6A T6B T7 E S C T5 T4 Cooling Mode Thermo ON Cooling Mode Thermo ON Cooling Mode Thermo ON ng Mode Thermo...

Page 22: ...ation EXVA EXV COND T2b T1 T2 EXV COND T2b T1 T2 EXV COND T2b T1 T2 T7C1 T3 TL T9 T8 T6A T6B T7 E S C EXV T2b T1 T2 T5 T4 OFF Heatiing Mode Thermo ON Heatiing Mode Thermo ON Heatiing Mode Thermo ON MS...

Page 23: ...7C1 T3 TL T9 T8 T6A T6B T7 E S C EXVA EXV EVAP T2b T1 T2 EXV COND T2b T1 T2 EXV COND T2b T1 T2 EXV COND T2b T1 T2 T5 T4 Cooling Mode Thermo ON ing Mode Thermo ON ing Mode Thermo ON ing Mode Thermo ON...

Page 24: ...peration in cooling mode EXVA EXV EVAP T2b T1 T2 EXV EVAP T2b T1 T2 EXV EVAP T2b T1 T2 EXV EVAP T2b T1 T2 T7C1 T3 TL T9 T8 T6A T6B T7 E S C T4 T5 Cooling Mode Thermo ON Cooling Mode Thermo ON Cooling...

Page 25: ...in heating mode and defrosting operation EXVA EXV EVAP T2b T1 T2 EXV EVAP T2b T1 T2 EXV EVAP T2b T1 T2 EXV EVAP T2b T1 T2 T7C1 T3 TL T9 T8 T6A T6B T7 E S C T4 T5 Cooling Mode Thermo ON Cooling Mode Th...

Page 26: ...rt 3 Control Part 3 Control 1 General Control Scheme Flowchart 26 2 Stop Operation 27 3 Standby Control 28 4 Startup Control 28 5 Normal Operation Control 31 6 Protection Control 37 7 Special Control...

Page 27: ...artup control Compressor startup delay control Startup control for cooling only main cooling operation Startup control for heating only main heating operation 4 Thermo on Normal operation control Comp...

Page 28: ...control ODU Inverter compressor A INV1 OFF Inverter fan 1 FANA Keeps for 2 min then OFF Inverter fan 2 FANB1 Four way valve ST1 Holds Electronic expansion valve EEVA 0pls EEVC 0pls Solenoid valve SV5...

Page 29: ...ic expansion valve and solenoid valve are self judged by the salve unit according to its own sensor status During the start up process the compressor frequency is based on the displacement frequency o...

Page 30: ...adjusted according to the module temperature NTC EEVC 0pls 0pls Compressor operation 17pls 8pls per 20S based on high pressure or discharge temperature Compressor not operation 0pls Solenoid valve SV...

Page 31: ...adjusted according to the difference between ambient temperature and low pressure saturation temperature EEVC 0pls 0pls Compressor operation 17pls 8pls per 20S based on high pressure or low pressure...

Page 32: ...ontrol Four way valve ST1 Outdoor unit heat exchanger Condenser OFF Outdoor unit heat exchanger Evaporator ON Solenoid valve fast defrosting in heating and unloading in cooling SV5 ON with the followi...

Page 33: ...Thermo OFF Fan Error or Stop Mode conflict Set the controller to display E0 default Mode conflict Set the controller not to display E0 ON OFF Notes 1 Oil return and defrosting operation are basically...

Page 34: ...o keep low pressure at target temperature Te Low pressure equivalent saturation temperature C Tes Target Te value Tes will be decided by Te setting if you choose Auto that means except Te setting the...

Page 35: ...o outdoor units Figure 3 5 2 Compressor priority and rotation three outdoor units 5 4 Heat Exchanger Control The mode of the outdoor units is uniformly controlled by the master outdoor unit the master...

Page 36: ...control on the electronic expansion valve EEVA so that the condenser outlet subcooled degree SC will become constant SC Tc TL SC Condenser outlet subcooled degree C TL Liquid pipe temperature C detec...

Page 37: ...17 500 540 540 18 530 580 580 19 560 620 620 20 600 660 660 21 630 710 710 22 660 760 760 23 700 810 810 24 740 860 860 8 14HP Standard step 25 780 910 910 10 16HP Standard step 26 820 960 960 12 18 2...

Page 38: ...control protects the system from abnormally low pressure and protects the compressors from transient drops in pressure Figure 3 6 3 Low pressure protection control in cooling operation Notes 1 Pe Suct...

Page 39: ...ntrol Over current protection control is performed to prevent tripping due to transient inverter over current It protects the compressors from abnormally high currents It is performed for each compres...

Page 40: ...0 degrees 6 6 Inverter Module Temperature Protection Control This control protects the compressors from abnormally high currents and protects the inverter modules from abnormally high temperatures It...

Page 41: ...ection control is used to prevent the activation of protection devices due to abnormal increase of high pressure ratio and to protect compressors against the transient increase of high pressure ratio...

Page 42: ...onent Wiring diagram label Cooling oil return control STEP1 STEP2 STEP3 ODU Inverter compressor INV1 PI control the minimum step is as follows 8 10HP 28Hz 12 22HP 61Hz 24 34HP 105HZ 36 60HP 165Hz 8 10...

Page 43: ...FAN Set the controller to display E0 default Thermo ON unit OFF Thermo OFF unit OFF Stop OFF FAN Set the controller not to display E0 Thermo ON unit Low fan speed Thermo OFF unit Low fan speed Stop OF...

Page 44: ...PI control Initial OFF But 10 Step or higher if the high pressure is larger than 2 2MPa Initial step then PI control Inverter fan 2 FANB Four way valve ST1 ON Initial step according to ambient temper...

Page 45: ...unit Stop or error stop Electronic expansion valve EEV Set the controller not to display E0 Thermo ON unit 0pls 0pls Thermo OFF unit Stop or error stop Rotating Defrosting Operation Timing of rotatin...

Page 46: ...has reached 5 minutes T3 Target value for a certain time Notes 1 This function is only available when the indoor units connected in V6R system are 2nd generation AC VRF indoor units which will be rel...

Page 47: ...compressor A INV1 Tes 15 C Upper limit 60 Hz 30Hz Inverter fan 1 FANA PI control PI control Inverter fan 2 FANB Four way valve ST1 OFF OFF OFF Electronic expansion valve EEVA Refer to startup control...

Page 48: ...rol EEVC 0pls 0pls Solenoid valve SV5 ON ON SV8A ON ON SV7 OFF OFF MS01 Electric ball valve EVBA Heating only normal control EVBB EVBC Electronic expansion valve EEVA MS04 12 Solenoid valve SV n A SV...

Page 49: ...and heating mode temperature compensation is no longer has any effect Figure 3 8 2 Auto mode and dual set points Tsc Cooling target set temperature 26 C default Tsh Heating target set temperature 24...

Page 50: ...ow Tsh the indoor unit run in heating mode When the indoor ambient temperature T1 is arrives Tsh 1 C the indoor unit is heating thermostat OFF When the indoor ambient temperature T1 is arrives Tsc the...

Page 51: ...ting mode 78 20 Cooling mode 56 Heating mode 56 12HP 24 Cooling mode 72 Heating mode 80 24 Cooling mode 72 Heating mode 80 21 Cooling mode 64 Heating mode 72 14HP 22 Cooling mode 90 Heating mode 106 2...

Page 52: ...V6R VRF 50 60Hz 51 Part 4 Field Settings Part 4 Field Settings 1 Outdoor Unit Field Settings 52 2 Mode Selection Box Field Settings 55...

Page 53: ...ic pressure Standard static pressure default 0Pa Low static pressure mode 20Pa Medium static pressure mode 40Pa High static pressure mode 60Pa Super high static pressure mode 80Pa S6 1 Reserved Reserv...

Page 54: ...the range 16 31 0 9 on ENC3 indicate 16 25 indoor units A F on ENC3 indicate 26 31 indoor units The number of indoor units is in the range 32 47 0 9 on ENC3 indicate 32 41 indoor units A F on ENC3 ind...

Page 55: ...10h 1 2 2 Silent mode setting Different silent mode can be set by switch ENC5 In night silent mode silent mode and super silent mode the Max outdoor fan speed and the compressor frequency are limited...

Page 56: ...igerant leakage sensor S1 2 Dry contact setting Dry contact is always closed and opened when being triggered by refrigerant leakage default Dry contact is always opened and closed when being triggered...

Page 57: ...er 0 The first PCB of MS box Factory setting can t be changed 1 The second PCB of MS box Factory setting can t be changed 2 The third PCB of MS box Factory setting can t be changed Notes 1 The switch...

Page 58: ...Diagrams Part 5 Electrical Components and Wiring Diagrams 1 Outdoor Unit Electric Control Box Layout 58 2 Outdoor Unit Main PCB 60 3 Data Transfer Module 68 4 Compressor Inverter Module 70 5 Fan Modul...

Page 59: ...Electric Control Box Layout 8 12HP Figure 5 1 1 8 12HP top layer of electric control box Figure 5 1 2 8 12HP bottom layer of electric control box Main PCB Filter board Inductor Communication terminal...

Page 60: ...Diagrams 14 20HP Figure 5 1 3 14 20HP top layer of electric control box Figure 5 1 4 14 20HP bottom layer of electric control box Main PCB Filter board Inductor Communication terminals block Power sup...

Page 61: ...V6R VRF 50 60Hz 60 Midea V6R Series Service Manual 2 Outdoor Unit Main PCB 2 1 Ports Figure 5 2 1 Outdoor unit main PCB ports1 Notes 1 Label descriptions are given in Table 5 2 1...

Page 62: ...ensor connection 0 5V DC varying 12 CN17 High pressure sensor connection 0 5V DC varying 13 CN6 Subcooling gas temperature sensor T6B connection 0 5V DC varying 14 CN8 Injection liquid temperature sen...

Page 63: ...W6 Table 5 2 2 Function of buttons SW3 to SW6 Button Function SW3 UP In menu mode previous and next buttons for menu modes Not in menu mode previous and next buttons for system check information SW4 D...

Page 64: ...nb 3 Press SW6 OK button to enter specified first level menu for example enter n4 mode 4 Press SW3 SW4 UP DOWN button to select the second level menu from n41 to n47 5 Press SW6 OK button to enter spe...

Page 65: ...n45 Power limitation mode 5 Only available for the master unit 60 capacity output n46 Power limitation mode 6 Only available for the master unit 50 capacity output n47 Power limitation mode 7 Only av...

Page 66: ...dOF is displayed nC2 Remote shut down setting nC2 0 Remote shut down setting 1 System stops when the circuit R OFF1 is short default nC2 1 Remote shut down setting 2 System stops when the circuit R OF...

Page 67: ...at degree C Actual value value displayed 24 Primary current A Actual value value displayed 25 EXVA position Actual value value displayed 24 26 EXVC position Actual value value displayed 4 27 Compresso...

Page 68: ...1 Parameters displayed on DSP2 Standby Unit s address The number of indoor units in communication with the outdoor units Normal operation For single compressor units Running speed of the compressor in...

Page 69: ...missioning or CHECK the operation status without removing the front panel Figure 5 3 1 Data Transfer Module layout 3 2 PCB components Figure 5 3 2 Data Transfer Module PCB components 3 3 Main function...

Page 70: ...S11 setting pressure SW5 Key button again to exit the auto snow blowing mode If the outdoor unit receive operation signal during auto snow blowing mode the outdoor unit exits the auto snow blowing mod...

Page 71: ...VRF 50 60Hz 70 Midea V6R Series Service Manual 4 Compressor Inverter Module 4 1 Ports 8 12HP Figure 5 4 1 8 12HP compressor inverter module ports1 Notes 1 Label descriptions are given in Table 5 4 1...

Page 72: ...V AC between L1 L2 and L3 6 CN17 Three phase output of the inverter connected to the compressor 0 380V AC varying 7 CN18 Three phase output of the inverter connected to the compressor 0 380V AC varyin...

Page 73: ...V6R VRF 50 60Hz 72 Midea V6R Series Service Manual 14 20HP Figure 5 4 2 14 20HP compressor inverter module ports1 Notes 1 Label descriptions are given in Table 5 4 2 LED...

Page 74: ...rter connected to the compressor 0 380V AC varying 9 CN25 Program port for main chip 10 CN39 Program port for parameters 11 CN8 CN9 Communication port to Main PCB 2 5 2 7V DC 12 CN21 High pressure swi...

Page 75: ...Port voltage 1 CN6 Power input of DC fan drive board 18V 22V DC 2 CN5 Power input of DC fan drive board 18V 22V DC 3 CN2 Debug port 4 CN1 Communication port to main board 2 5 2 7V DC 5 CN4 Communicat...

Page 76: ...tric ball valve B connection 12VDC 4 CN19 Electric ball valve C connection 12VDC 5 CN22 Electric expansion valve A connection 12VDC 6 CN20 Program port 5VDC 7 CN3 CN4 CN5 CN6 CN7 Refrigerant sensors c...

Page 77: ...reserved 5VDC 5 CN13 CN12 Communication port to outdoor unit or other MS 5VDC 6 CN14 CN15 Communication port to main PCB 5VDC 7 CN22 Communication port to indoor unit 5VDC 8 CN26 Communication port to...

Page 78: ...layed 07 EEV position Actual value value displayed 10 08 Software version 09 MS Address Actual value value displayed 10 EBVA position Actual value value displayed 10 11 EBVB position Actual value valu...

Page 79: ...fan drive board B CN51 AC filter board CN8 CN7 Fan A Left CN3 N P CN8 CN7 Fan B Right CN11 CN41 CN30 Black Brown Gray Black Brown Yellow Green Brown Brown Red White Red White Red White CN38 CN8 CN9 C...

Page 80: ...closed and opened when being triggered by refrigerant leakage default ON dry contact is always opened and closed when being triggered by refrigerant leakage S2 ON SW3 EBV C EBV B EEV EBV A EBV C EEV M...

Page 81: ...T1C2 H0 Communication failure between MS and master outdoor unit E2 G Y LL S1 S2 dialing setting error FE MS has no address when first powered on ENC2 P Q E POWER SV1B 1 SV2B 2 SV3B 3 SV4B 4 SV1A 1 SV...

Page 82: ...11 SV4B 12 SV1A 9 SV2A 10 SV3A 11 SV4A 12 SVP Yellow Black Yellow Black Yellow Black Yellow Black SV4 SV3 SV2 SV1 EEVA Blue Red Blue Red Indoor No 1 M O M O 1 M I 2 M I 3 M I 4 M I SW1 SW2 Brown Red...

Page 83: ...V6R VRF 50 60Hz 82 Midea V6R Series Service Manual...

Page 84: ...60Hz 83 Part 6 Diagnosis and Troubleshooting Part 6 Diagnosis and Troubleshooting 1 Error Code Table 84 2 Troubleshooting for Outdoor Unit 87 3 Troubleshooting for Mode Selection Box 150 4 Appendix to...

Page 85: ...compressor drive board No H2 Qty of outdoor unit decreases error Only displayed on the master unit with the error No H3 Qty of outdoor unit increases error Only displayed on the master unit with the e...

Page 86: ...he unit with the error No L5 Zero speed protection Displayed on the unit with the error No L6 Motor parameter error Displayed on the unit with the error No L7 Phase sequence error Displayed on the uni...

Page 87: ...ore the system can resume operation Table 6 1 3 MS01 Error code table Error code Content Remarks Manual re start required1 E2 Communication failure between MS and master outdoor unit The indoor unit d...

Page 88: ...uses Incorrect outdoor unit address setting Communication wires between outdoor units not connected properly Loosened wiring within electric control box Damaged outdoor main PCB or electric control bo...

Page 89: ...x communication terminals block are loose Yes Ensure the wires are connected properly No Replace the outdoor main PCB resolves the error No Replace the electric control box communication terminals blo...

Page 90: ...communication for 2 minutes after the system power on 20 minutes Recover condition Communication go back to normal Reset method Resume automatically Possible causes Communication wires between MS box...

Page 91: ...es Reverse the sequence of signal lines No Interference from high voltage 220V or higher wires Yes Ensure the communication wires and high voltage wires are separated No Communication wires are close...

Page 92: ...utomatically Possible causes Temperature sensor not connected properly or has malfunction Outdoor main PCB damaged Procedure E4 Temperature sensor connection on outdoor main PCB is loose1 Yes Ensure t...

Page 93: ...unit with the error Trigger recover condition Trigger condition Outdoor unit power supply phase voltage 170V or 270V Recover condition Outdoor unit power supply phase voltage is 180V and 260V Reset m...

Page 94: ...the relevant parts No Replace the outdoor main PCB Notes 1 The normal voltage between A and N B and N and C and N is 198 242V 2 The normal resistances of the inverter compressor are 0 05 0 15 among U...

Page 95: ...anually restart Possible causes Temperature sensor not connected properly or has malfunction Outdoor main PCB damaged Procedure E7 Temperature sensor connection on outdoor main PCB is loose1 Yes Ensur...

Page 96: ...dress is set more than 2 Recover condition Outdoor unit addresses are set from 0 to 2 Reset method Manually restart Possible causes Invalid outdoor unit address Outdoor main PCB damaged Procedure E8 T...

Page 97: ...drive parameter is match Reset method Manually restart Possible causes Outdoor unit was powered on immediately after being powered off Outdoor main PCB damaged Procedure E9 The outdoor unit was powere...

Page 98: ...usly for 10 seconds Recover condition DC bus voltage goes back to normal Reset method Restart automatically Possible causes Loosened wiring of the compressor inverter module Incorrect wiring of the re...

Page 99: ...rror Fb indicates heat sink temperature sensor T9 error Fc indicates heat exchanger liquid temperature sensor TL error Fd indicates suction temperature sensor T7 error All units stop running Error cod...

Page 100: ...main PCB Liquid pipe temperature sensor T5 and Heat sink Temperature sensor T9 error connection are port CN12 and CN14 on the outdoor main PCB Heat exchanger gas Temperature sensor T8 and Heat exchang...

Page 101: ...ayed on the unit with the error Trigger recover condition Trigger condition The main control board cannot receive the feedback signal of EEV Recover condition The main control board can receive the fe...

Page 102: ...ansion valve coil has malfunction2 Yes Replace the coil No Replace the outdoor main PCB Notes 1 Electronic expansion valve coil connections are port CN70 and CN72 on the outdoor main PCB 2 The normal...

Page 103: ...s stop running Error code is displayed on the unit with the error Trigger recover condition Trigger condition Main control board and inverter driver board cannot communication for 2 minutes Recover co...

Page 104: ...ck the power supply circuit 3 No Replace the outdoor main PCB is the malfunction solved Yes Normal No Replace the inverter module Yes Normal No Replace filter board Notes 1 Communication wire from out...

Page 105: ...recover condition Trigger condition Qty of slave units detected by master unit has decreased or increased Recover condition Qty of slave units detected by master unit goes back to normal Reset method...

Page 106: ...hooting Procedure H2 H3 Some outdoor units in the system are powered off Yes Power on all the outdoor units No The power supply is abnormal Yes Check the power supply equipment No Troubleshoot as for...

Page 107: ...error Excessive compressor frequency variation PED software verification failed Specific error codes for H4 inverter module protection If an H4 error code is displayed enter menu mode n31 refer to Pa...

Page 108: ...e 5 3 2 Errors indicated on LED1 LED1 flashing pattern Corresponding error Flashes 8 times and stops for 1 second then repeats L0 Inverter compressor module error Flashes 9 times and stops for 1 secon...

Page 109: ...nsulation resistance of compressor Is it greater than 100K No Is the module in well heat dissipation Fasten IPM screws again Is the silica gel coated well for heat radiation Coat with silica gel Does...

Page 110: ...en the voltage is lower than 320V L1 protection will be appeared Figure 6 2 6 Inverter module terminals 8 12HP 14 18HP L1 protection The power supply is abnormal Check the power supply equipment No ou...

Page 111: ...ule should be 450 650V When the voltage is higher than 700V L2 protection will be appeared Figure 6 2 7 Inverter module terminals 8 12HP 14 18HP L2 protection The power supply is abnormal Check the po...

Page 112: ...Diagnosis and Troubleshooting L5 Zero speed protection There is abnormal noise of compressor when startup or running Replace the compressor No Yes Replace the inverter module L5 Fault Disconnect the...

Page 113: ...hase sequence error L7 protection Compressor wiring is loose Reconnect cables based on wiring diagram An open circuit in the 3 phase U V W of compressor terminals Replace the compressor Replace the in...

Page 114: ...module Short circuit high pressure sensor connection on the inverter module the error code LA disappeared High pressure sensor has short circuited or failed replace the sensor No Yes LA Fault Disconne...

Page 115: ...ressor is heavily spoiled check the oil in the other compressors in the system Drain the oil from any compressors where the oil has been spoiled Go to Step 4 Step 4 Replace oil separator s and accumul...

Page 116: ...rge refrigerant Refer to the V6R Engineering Data Book Part 3 Figure 6 2 10 Inspecting compressor oil This oil is black it has been carbonized This oil is a little yellow but is clear and transparent...

Page 117: ...e Manual Figure 6 2 11 Effects of spoiled compressor oil Worn scroll plate Worn scroll plate Normal compressor bearings Seriously worn and damaged bearings Filter blocked by impurities which leads to...

Page 118: ...ore indoor units cannot be detected by master unit for 20 minutes Recover condition Number of indoor units detected by master unit is same as number set on outdoor main PCB for 1minute Reset method Re...

Page 119: ...t error resolves the outdoor unit error No Two or more indoor units are assigned the same address3 No Yes Setting the indoor units addresses uniquely resolves the error No Replace the outdoor main PCB...

Page 120: ...gger condition Discharge pressure 0 3MPa and T4 10 for a consecutive of 20s or Discharge pressure 0 3MPa and compressor operates for a consecutive of 20s Recover condition Does not meet the above cond...

Page 121: ...nection is port CN17 on the outdoor main PCB 2 Measure the resistance among the three terminals of the pressure sensor If the resistance is of the order of mega Ohms or infinite the pressure sensor ha...

Page 122: ...ith the error Trigger recover condition Trigger condition The main control board cannot receive the feedback signal of low pressure sensor Recover condition The main control board can receive the feed...

Page 123: ...e1 Yes Ensure the sensor is connected properly No Low pressure sensor has failed2 Yes Replace the sensor No Replace the outdoor main PCB Notes 1 High pressure sensor connection is port CN17 on the out...

Page 124: ...1Hd indicates an error on the slave unit with address 1 2Hd indicates an error on the slave unit with address 2 All units stop running Error code is only displayed on the master unit Trigger recover c...

Page 125: ...Discharge pressure 3 5MPa and Restart permission ON Heating Only Main Heating Discharge pressure 3 1MPa and Restart permission ON Reset method Resume automatically Discharge pressure switch protectio...

Page 126: ...Notes 1 The high pressure sensor connection is port CN17 on the outdoor main PCB 2 Measure the resistance among the three terminals of the pressure sensor If the resistance is of the order of mega Ohm...

Page 127: ...protection P2 protection appears three times in 60 minutes Recover condition Cooling Only Main Cooling Discharge pressure 0 23MPa and Restart permission ON Heating Only Main Heating Discharge pressure...

Page 128: ...causes compressor discharge temperature to be higher than normal discharge and suction pressures to be lower than normal and compressor current to be lower than normal and may cause frosting to occur...

Page 129: ...es are closed Indoor load too large Power supply abnormal Sudden interruption of power to IDUs Excess refrigerant System contains air or nitrogen Poor condenser heat exchange High pressure side blocka...

Page 130: ...charge temperature to be higher than normal discharge pressure to be higher than normal compressor current to be higher than normal abnormal compressor noise and an unsteady pressure meter reading For...

Page 131: ...unit stop valves are closed Indoor load too large Power supply abnormal Sudden interruption of power to IDUs Excess refrigerant System contains air or nitrogen Poor condenser heat exchange High pressu...

Page 132: ...gher than normal For normal system parameters refer to Table 6 4 4 and 6 4 5 in Part 6 4 2 Normal Operating Parameters of Refrigerant System 3 Air or nitrogen in the system causes discharge temperatur...

Page 133: ...90 o C Reset method For P4 protection Resume automatically Discharge Temp switch protection Trigger condition Discharge temperature 115o C Recover condition Discharge temperature 75o C Reset method Re...

Page 134: ...e blocked EEV or dirty filter4 Yes Inspect the system and fix the error If the filter is blocked by ice the piping should be cleaned No The indoor load is too large5 Yes Make sure the combination rati...

Page 135: ...be lower than normal and may cause frosting to occur on the suction pipe For abnormal refrigerant system parameters refer to Table 6 4 4 and 6 4 5 in Part 6 4 3 Parameters of Excess and Insufficient...

Page 136: ...rigger condition For P9 protection Fan speed is too low For H9 protection P9 protection appears ten times in 120 minutes Recover condition Fan speed go back to normal Reset method For P9 protection Re...

Page 137: ...he unit capacity given on the unit s nameplate No Some power wires or communication wires of fan module are not connected properly Yes Ensure power and communication wires are connected properly No Th...

Page 138: ...protection appears three times in 100 minutes Recover condition Refer to Part 3 6 5 Inverter Module Temperature Protection Control Reset method For PL protection Resume automatically For C7 protectio...

Page 139: ...Trigger recover condition Trigger condition Refer to Part 3 6 6 Wet Compression Protection Control Recover condition Refer to Part 3 6 6 Wet Compression Protection Control Reset method Resume automat...

Page 140: ...C and EEVA minimum opening Evaporator Yes Check the fault that EEVA or EEVC can t be completely closed or SV5 can t be opened No Excess refrigerant5 Yes Discharge part of the refrigerant Add oil if it...

Page 141: ...it Trigger recover condition Trigger condition The port of CN91 on the outdoor main PCB has short circuited Received the emergency shutdown instructions from centralized controller Recover condition T...

Page 142: ...cedure A0 The port of CN91 on the outdoor main PCB has short circuited Yes Replace the outdoor main PCB No Received the emergency shutdown instructions from centralized controller Yes Cancel the emerg...

Page 143: ...urs after the ODU reports A12 nE 3 A13 The unit is stopped forcedly 24 hours after the ODU reports A13 Recover condition The outdoor unit does not receive the refrigerant leakage fault signal sent by...

Page 144: ...treated as standard indoor unit AHU KIT High temperature hydraulic module HT The following connection combinations are allowed VRF Indoor AHU KIT VRF Indoor HT VRF Indoor only In addition to the abov...

Page 145: ...connection ration exceeds the match table below Recover condition the indoor unit connection ration in the range of the match table Reset method Manually restart Table 6 2 1 Match table IDU1 IDU2 IDU...

Page 146: ...minutes after power on All units stop running Error code is only displayed on the master unit Trigger recover condition Trigger condition Force cooling operation not performed in 30 minutes after pow...

Page 147: ...ble zone make the cooling self test and heating self check selection according to the following table If it is out range of test operation the outdoor unit displays the fault code U21 or U22 or U23 It...

Page 148: ...osis and Troubleshooting Possible causes Temperature is out of range Procedure U21 U22 U23 After selecting n15 for forced heating operation in the menu for a period of time increasing the inside tempe...

Page 149: ...ve is not opened All units stop running Error code is only displayed on the master unit Trigger recover condition Trigger condition U31 Pc_max 3 9MPa in heating operation U32 Pc_max 3 9MPa in heating...

Page 150: ...g Error code is only displayed on the master unit Trigger recover condition Trigger condition Indoor unit refrigerant pipe and signal cable connection are inconsistent Recover condition Indoor unit re...

Page 151: ...s Communication wires between MS and outdoor units not connected properly Loosened wiring within electric control box The sequence of the PQE signal lines is incorrect Interference from high voltage w...

Page 152: ...mmunication 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 source of...

Page 153: ...1 or T2C2 Recover condition The main control board can receive the feedback signal of temperature sensor T1C1 or T2C2 Reset method Resume automatically Possible causes Temperature sensor not connected...

Page 154: ...ing Error code is displayed on the malfunction MS box The indoor unit display board or wired controller connected to this MS displays F8 Trigger recover condition Trigger condition MS EEPROM parameter...

Page 155: ...ard or wire control connected to this MS displays F8 Trigger recover condition Trigger condition MS has no address when first powered on Recover condition MS has got an address Reset method Resume aut...

Page 156: ...ger recover condition Trigger condition S1 and S2 are set to ON but the indoor unit is connected to both pipes 1 and 2 or the indoor unit is connected to pipes 3 and 4 Recover condition Does not meet...

Page 157: ...ndition Trigger condition the communication between MS s master PCB board and slave PCB is abnormal for 2 minutes Recover condition Communication go back to normal Reset method Resume automatically Po...

Page 158: ...layed on the unit with the error The indoor unit display board or wired controller connected under this MS displays F8 fault code Trigger recover condition Trigger condition The main control board can...

Page 159: ...connected properly No Electronic ball valve coil has malfunction1 Yes Replace the coil No Replace the MS main PCB Notes 1 The normal resistances between EBV coil wiring terminals Gray common port and...

Page 160: ...ected to this MS displays F8 Trigger recover condition Trigger condition MS main power off and UPS power is ON Recover condition MS main power on and UPS power is OFF Reset method Resume automatically...

Page 161: ...nected to this MS displays F8 Trigger recover condition Trigger condition Total capacity of indoor units connected to the MS01 is more than 12HP Recover condition Total capacity of indoor units connec...

Page 162: ...cation between main control board and inverter driver board is abnormal for 2 minutes Recover condition Communication go back to normal Reset method Resume automatically Possible causes S1 dial settin...

Page 163: ...1 4 6 9853 2 6786 83 181 4 1 0681 4 4149 16 3 2 86 727 0 4252 34 93 2 6 6873 2 7327 84 183 2 1 0344 4 4313 15 5 81 694 0 4490 35 95 6 4038 2 7863 85 185 1 0019 4 4472 14 6 8 76 982 0 4739 36 96 8 6 13...

Page 164: ...8 3 113 3 6069 3 37 4 155 2 0 2468 55 131 16 32 1 6530 107 224 6 3 025 3 6355 4 39 2 147 6 0 2589 56 132 8 15 73 1 6940 108 226 4 2 941 3 6633 5 41 140 4 0 2715 57 134 6 15 16 1 7356 109 228 2 2 86 3...

Page 165: ...4 8 33 06244898 0 98 1 06 154 7 321679389 2 62 0 26 37 7 31 44980392 1 02 1 09 158 6 977313433 2 68 0 27 39 2 30 69 1 04 1 13 164 6 541449275 2 76 0 29 42 1 29 25481481 1 08 1 16 168 6 230780142 2 82...

Page 166: ...ambient temperature is high the system is being run in cooling mode with the following settings temperature 17 C fan speed high If the outdoor ambient temperature is low the system is being run in he...

Page 167: ...ea Headquarters Building 6 Midea Avenue Shunde Foshan Guangdong China Postal code 528311 cac midea com global midea com Note Product specifications change from time to time as product improvements and...

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