Midea MOA-07HN1-QC2 Service Manual Download Page 52

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9.2.4 EEPROM parameter error diagnosis and solution

9.2.5 Zero crossing detection error

When such failure occurs, the main control board must have fault.

hut off the power supply and turn on it 5s later

The problem comes out again

Is the EEPROM chip plugged in indoor PCB well?

Correct the connection

Replace the main PCB of indoor unit

Summary of Contents for MOA-07HN1-QC2

Page 1: ...XSEU A 1202 SERVICE MANUAL MIDEA AIRCONDITIONER EUROPE MARKET SPLIT WALL MOUNTED TYPE X ON OFF SERIES...

Page 2: ...ing the cables 19 6 3 Pipe length and the elevation 20 6 4 Installation for the first time 22 6 5 Adding the refrigerant after running the system for many years 25 6 6 Re installation while the indoor...

Page 3: ...or repair the product there is risk of fire or electric shock n Always ground the product There is risk of fire or electric shock n Install the panel and the cover of control box securely There is ri...

Page 4: ...ng operation There is risk of fire or electric shock n Do not place anything on the power cable There is risk of fire or electric shock n Do not plug or unplug the power supply plug during operation T...

Page 5: ...n that water could not enter the product There is risk of fire electric shock or product damage n Ventilate the product from time to time when operating it together with a stove etc There is risk of f...

Page 6: ...reserving foods works of art etc It is a consumer air conditioner not a precision refrigerant system There is risk of damage or loss of property n Do not block the inlet or outlet of air flow It may c...

Page 7: ...nes of the same type Do not mix old and mew batteries or different types of batteries There is risk of fire or explosion n Do not recharge or disassemble the batteries Do not dispose of batteries in a...

Page 8: ...tdoor units On Off 7k MSX 07HRN1 QC2 MOA 07HN1 QC2 9k MSX 09HRN1 QC2 MOA 09HN1 QC2 MSX 09HRN1 QC2 MOA1 09HN1 QC2 12k MSX 12HRN1 QC2 MOB1 12HN1 QC2 MSX 12HRN1 QC2 MOB 12HN1 QC2 18k MSX 18HRN1 QC2 MOF 1...

Page 9: ...checking the evaporator pipe temperature Indoor units Operation by remote controller Anti freezing control in cooling Time Delay Safety control Indoor fan speed control Two direction air vane Sleep m...

Page 10: ...he valves and prevents water from dripping Outdoor units Power relay control Valve protection cover Made from electrolytic zinc steel sheet and anti rust coated components Low noise air flow system An...

Page 11: ...9 3 Dimension 3 1 Indoor Units Figure 1 Figure 2...

Page 12: ...e 3 Figure 4 Figure Models W D H Figure 1 MSX 07HRN1 QC2 710 195 250 MSX 09HRN1 QC2 Figure 2 MSX 12HRN1 QC2 790 195 265 Figure 3 MSX 18HRN1 QC2 850 225 305 Figure 4 MSX 21HRN1 QB8W 998 235 322 MSX 24H...

Page 13: ...e than 30cm More than 60cm Service space Fence or obstacles Model W D H W1 A B MOA 07HN1 QC2 700 240 540 757 458 250 MOA1 09HN1 QC2 MOA 09HN1 QC2 MOB1 12HN1 QC2 780 250 540 843 549 276 MOB 12HN1 QC2 M...

Page 14: ...pump models INDOOR OUTDOOR LIQUID SIDE GAS SIDE HEAT EXCHANGE EVAPORATOR HEAT EXCHANGE CONDENSER COMPRESSOR 2 WAY VALVE 3 WAY VALVE CHECK VALVE Heating Model only CAPILIARY TUBE REVERSING VALVE Heatin...

Page 15: ...13 5 Wiring Diagram 5 1 Indoor Units MSX 07HRN1 QC2 MSX 09HRN1 QC2 MSX 12HRN1 QC2 MSX 18HRN1 QC2...

Page 16: ...14 MSX 21HRN1 QB8W MSX 24HRN1 QB8W...

Page 17: ...15 5 2 Outdoor Units MOA 07HN1 QC2...

Page 18: ...16 MOA1 09HN1 QC2 MOA 09HN1 QC2 MOB1 12HN1 QC2 MOB 12HN1 QC2...

Page 19: ...17 MOF 18HN1 QC2...

Page 20: ...18 MOF1 21HN1 QB8W MOF3 24HN1 QB8W...

Page 21: ...6500 663kgf cm 6700 683kgf cm 6 2 Connecting the cables The power cord of connect should be selected according to the following specifications sheet Rated current of appliance Nominal cross sectional...

Page 22: ...se vacuum pump MSX 07HRN1 QC2 More than 5m Use vacuum pump Pipe length 5 20g m MSX 09HRN1 QC2 MSX 12HRN1 QC2 MSX 18HRN1 QC2 MSX 21HRN1 QB8W More than 5m Use vacuum pump Pipe length 5 40g m MSX 24HRN1...

Page 23: ...21 Caution The capacity test is based on the standard length and the maximum permissive length is based on the system reliability The oil trap should be installed per 5 7 meters...

Page 24: ...oints of the piping If bubbles come out the pipes have leakage 1 Air purging with vacuum pump 1 Completely tighten the flare nuts of the indoor and outdoor units confirm that both the 2 way and 3 way...

Page 25: ...alve 8 Fully open the 2 way valve and 3 way valve and securely tighten the cap of the 3 way valve 2 Air purging by refrigerant Procedure 1 Confirm that both the 2 way and 3 way valves are set to the c...

Page 26: ...valve and the 3 way valve Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder If the refrigerant is R410A make the cylinder bottom up to ensu...

Page 27: ...harge hose to the valve at the bottom of the cylinder If the refrigerant is R410A make the cylinder bottom up to ensure liquid charge 2 Purge the air from the charge hose Open the valve at the bottom...

Page 28: ...1 Confirm that both the 2 way and 3 way valves are set to the opened position Remove the valve stem caps and confirm that the valve stems are in the opened position Be sure to use a hexagonal wrench t...

Page 29: ...osition 2 Connect the charge set and a charging cylinder to the service port of the 3 way valve Leave the valve on the charging cylinder closed 3 Air purging Open the valves on the charging cylinder a...

Page 30: ...re to check the gas leakage 6 7 Re installation while the outdoor unit need to be repaired 1 Evacuation for the whole system Procedure 1 Confirm that both the 2 way and 3 way valves are set to the ope...

Page 31: ...le and record the weight 4 Open the valves Low side on the charge set and charge the system with liquid refrigerant If the system cannot be charge with the specified amount of refrigerant or can be ch...

Page 32: ...30 Use torque wrench to tighten the service port cap to a torque of 18N m Be sure to check for gas leakage...

Page 33: ...the unit to function abnormally 2 Room relative humidity less than 80 If the air conditioner operates in excess of this figure the surface of the air conditioner may attract condensation Please set t...

Page 34: ...PRE DEF Indicator For Cooling Heating models only This indicator illuminates when the air conditioner starts defrosting automatically or when the warm air control feature is activated in heating mode...

Page 35: ...33 Ionizer Plasma function indicator This indicator illuminates when Ionizer Plasma function is on...

Page 36: ...g mode the indoor fan will run at low speed I3SEC 7 0A I5min 6 0A IFAN 5 0A IRESTORE 6 5A for MSX 07HRN1 QC2 model I3SEC 10 0A I5min 7 5A IFAN 6 0A IRESTORE 5 0A for MSX 09HRN1 QC2 model I3SEC 12 0A I...

Page 37: ...tdoor units communication protection only for MSX 21HRN1 QB8W MSX 24HRN1 QB8W model If the indoor units can not receive the feedback signal from the outdoor units for 2 minutes the AC will stop and di...

Page 38: ...p it will follow the below rules When indoor room temp T1 is lower than Tn the compressor and outdoor fan will shut off When T1 is higher than Tm the compressor and outdoor fan will start up Tm Ts Tn...

Page 39: ...T2 protection When the evaporator coil temp T2 keeps lower than TE5 for 5 minutes the compressor and outdoor fan will shut off When T2 is higher than TE6 the compressor and outdoor fan will restart up...

Page 40: ...then follow the below rules While t 7 When indoor room temp T1 is higher than Tj the compressor and outdoor fan will shut off When T1 is lower than Tk the compressor and outdoor fan will start up Tj...

Page 41: ...emp T2 is getting higher T2 TE2 the indoor fan will run at setting speed TE1 T2 TE2 the indoor fan will run at low speed When T2 is getting lower TE4 T2 TE3 the indoor fan will run at low speed T2 TE4...

Page 42: ...e T2 and T1 B2 The cumulative compressor running time is over 120 minutes Meanwhile the T2 T1 meet the below table T2 T1 High speed THDEFROST 2 Medium speed TMDEFROST 2 Low speed TLDEFROST 2 Breeze of...

Page 43: ...2 A B1 60 runtime 80 DT1 1 Case 3 A B1 80 runtime 95 DT1 2 Case 4 A B1 95 runtime 110 DT1 3 Case 5 A B1 110 runtime 120 DT1 4 Case 6 A B2 DT1 5 Case 7 DT1 5 Note From case1 to case 5 If case B happen...

Page 44: ...rotection cumulates up to 90 minutes l Condition of ending defrosting If any one of the following items is satisfied the defrosting will terminate and the machine will turn to normal heating mode 1 T3...

Page 45: ...2 models T T1 Ts Running mode T 2 Cooling 3 T 2 Fan only T 3 Heating for cooling only models they will run at fan only mode For MSX 21HRN1 QB8W MSX 24HRN1 QB8W models T T1 Ts Running mode T 2 Cooling...

Page 46: ...ure exceeds 13 8 4 5 3 System protection is active in this mode For MSX 21HRN1 QB8W MSX 24HRN1 QB8W models 8 4 5 4 The indoor fan will keep running at low speed 8 4 5 5 The outdoor fan compressor and...

Page 47: ...mode and turns off 8 4 8 2 Operation process in sleep mode is as follow After pressing ECONOMIC or SLEEP button on controller the machine will turn into sleep mode When cooling the setting temperatur...

Page 48: ...46 automatically after 3 minutes when power returns If the memorization condition is forced cooling mode the unit will run in cooling mode for 30 minutes and then turn to auto mode as 24 setting temp...

Page 49: ...rent protection occurs 4 times E5 The T1 sensor is open circuit or short circuit E6 The T2 sensor is open circuit or short circuit For MSX 21HRN1 QB8W MSX 24HRN1 QB8W models LED Failure E1 EEPROM erro...

Page 50: ...rk normally Turn off the unit rotate the cross fan Does it rotate freely No Disassemble the connection between the fan and the motor check if the bearing is normal If not change the bearing If yes fol...

Page 51: ...its and check if the problem remains Yes Check if the voltage of the power supply is too low No No Replace the compressor Yes Check if the capillary is blocked Yes No There is some air mixed inside th...

Page 52: ...sing detection error When such failure occurs the main control board must have fault Shut off the power supply and turn on it 5s later The problem comes out again Is the EEPROM chip plugged in indoor...

Page 53: ...the outdoor PCB Yes Change the indoor PCB Yes Power off then power on the A C by the breaker reconnect the power wire Is the error extinguished Check the wiring on the outdoor terminal and indoor ter...

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