Midea MFM-24ARN1-Q, Service Manual

Page 1: ...SERVICE MANUAL MIDEA AIRCONDITIONER FLOOR STANDING TYPE Model MFM 24ARN1 Q MOF 24HN1 QB8 MFM 48ARN1 R MOU 48HN1 RB6W MFM 60ARN1 R MOUL 60HN1 R DM16 01 01 25en...

Page 2: ...CONTENTS 1 Safety Precautions 3 2 Specifications 5 3 Dimension 7 4 Refrigerant cycle diagram 9 5 Wiring diagram 11 6 Installation details 14 7 External view and display 33 8 Operation characteristics...

Page 3: ...rn the breaker off or disconnect the power supply cable as soon as possible When the product is soaked flooded or submerged contact an Authorized service center Be caution that water could not enter t...

Page 4: ...rated Do not drink the water drained from the product Use a firm stool or ladder when cleaning or maintaining the product Replace the all batteries in the remote control with new ones of the same type...

Page 5: ...nd GMCC PANASONIC PANASONIC Capacity Btu h 24771 24959 48109 55957 69264 Input W 2430 2600 4750 5750 6750 Rated current RLA A 11 65 12 6 8 22 9 77 9 84 Locked rotor Amp LRA A 66 66 67 Thermal protecto...

Page 6: ...e f Coil length x height x width mm 770x660x38 1 837x1100x38 1 837x1100x38 1 g Number of circuits 4 8 8 Outdoor noise level dB A 60 64 64 Outdoor unit Dimension W D H mm 845x320x700 900x350x1170 900x3...

Page 7: ...DM16 01 01 25en Floor Standing MFM 7 Service manual 3 Dimension 3 1 Indoor Unit H W D Dimension Mode W mm D mm H mm MFM 24ARN1 Q 500 315 1700 MFM 48ARN1 R 550 418 1824 MFM 60ARN1 R 600 455 1934...

Page 8: ...vice manual 8 3 2 Outdoor Unit Dimension Mode W mm D mm H mm W1 mm A mm B mm MOF 24HN1 QB8 845 320 700 908 560 335 Dimension Mode W mm D mm H mm W1 mm A mm B mm MOU 48HN1 RB6W 900 350 1170 985 590 378...

Page 9: ...QB8 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 4 WAY VALVE Heating Model onl...

Page 10: ...HANGE CONDENSER Compressor 2 WAY VALVE 3 WAY VALVE 4 WAY VALVE COOLING HEATING T2 Evaporator temp sensor T1 Room temp sensor T3 Condenser temp sensor T5 Discharge temp sensor T4 Ambient temp sensor IN...

Page 11: ...DM16 01 01 25en Floor Standing MFM 11 Service manual 5 Wiring diagram 5 1 MFM 24ARN1 Q Indoor unit Outdoor unit MOF 24HN1 QB8...

Page 12: ...Floor Standing MFM DM16 01 01 25en Service manual 12 5 2 MFM 48ARN1 R Indoor unit Outdoor unit MOU 48HN1 RB6W...

Page 13: ...DM16 01 01 25en Floor Standing MFM 13 Service manual 5 3 MFM 60ARN1 R Indoor unit Outdoor unit MOUL 60HN1 R...

Page 14: ...Unit 6 1 2 1 Before installing the outdoor unit you should a Select a place where no direct sunlight or other heat radioactivity may reach A sunshade is needed if it is unavoidable b Select a place th...

Page 15: ...DM16 01 01 25en Floor Standing MFM 15 Service manual 6 1 2 3 Reserve enough space for installation maintenance and unit functioning Remove as many obstacles as possible nearby...

Page 16: ...g 2 Dismounting the air inlet grid Please take off the air inlet grid before connecting the pipes wires The grid is hitched by a loop inside To dismount the air inlet grid hold both sides of the grid...

Page 17: ...d 3 Do not make the angle of inclination more than 45 degrees while shipping Avoid horizontal storage 4 Be sure the electric insulation work is well done if installed on metal ceiling wall 5 Fix the u...

Page 18: ...ength and maximum allowance length is base of reliability Oil trap should be installed per 5 7 meters 6 3 2 Piping connection 6 3 2 1 Connecting Of Refrigerant Pipe a Only the correctly installing of...

Page 19: ...ke sure no gas from connections with leak detector or soap water Caution A Lo packed valve B Hi packed valve C and D are ends of indoor unit connection Caution in Handling the Packed Valve a Open the...

Page 20: ...een drained 6 3 2 3 To make the refrigerant pipe unblocked completely You should keep the cut off valves of the outdoor unit completely open after you have finished the above steps 5 3 2 1 or 5 3 2 2...

Page 21: ...es 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 valves are set to the closed position 2 Connect...

Page 22: ...s a little higher than the atmosphere pressure Then remove the charge hose from the 3 way valve 8 Fully open the 2 way valve and 3 way valve and securely tighten the cap of the 3 way valve 2 Air purgi...

Page 23: ...ice port cap to a torque 18N m Be sure to check the gas leakage 3 Adding the refrigerant if the pipe length 5m Procedure 1 Connect the charge hose to the charging cylinder open the 2 way valve and the...

Page 24: ...Be sure to check for gas leakage 6 3 4 Adding the refrigerant after running the system for many years Procedure 1 Connect the charge hose to the 3 way service port open the 2 way valve and the 3 way...

Page 25: ...displays the proper weight refer to the gauge and the pressure of the low side disconnect the charge hose from the 3 way valve s service port immediately and turn off the air conditioner before disco...

Page 26: ...o to the 3 way valves gas service port 3 Air purging of the charge hose Open the handle Lo valve of the manifold valve slightly to purge air from the charge hose for 5 seconds and then close it quickl...

Page 27: ...eat 3 times After purging the air use a torque wrench to tighten the flare nut on the 2 way valve 4 Check the gas leakage Check the flare connections for gas leakage 5 Discharge the refrigerant Close...

Page 28: ...ves are set to the opened position 2 Connect the vacuum pump to 3 way valve s service port 3 Evacuation for approximately one hour Confirm that the compound meter indicates 0 1Mpa 4 Close the valve Lo...

Page 29: ...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 charged with a little at a ti...

Page 30: ...ain Pipe with the Drain Pipe then fix it with band 4 If you have to connect the Drain Pipe indoors to avoid condensing caused by air intake you must cover the pipe with heat insulation material polyet...

Page 31: ...ir conditioner is different according to the models Please refer to the WIRING DIAGRAM pasted on the indoor and outdoor units before wire connection Model Power supply Input Rated Amp Switch Fuse Powe...

Page 32: ...not lift the panel any further when it stops with a click sound 2 Press the manual switch button twice until the operation indicator lights the unit will operate on manual cool mode 3 Check if all th...

Page 33: ...and display 7 1 External view This unit consists of indoor unit and outdoor unit Note All the pictures in this manual are for explanation purpose only They may be slightly different from the air cond...

Page 34: ...Floor Standing MFM DM16 01 01 25en Service manual 34 7 2 Control Panel Control Buttons and Functions...

Page 35: ...de of the above conditions certain safety protection features may come into operation and cause the unit to function abnormally 2 Room relative humidity less than 80 If the air conditioner operates in...

Page 36: ...he compressor stops automatically 9 2 2 Sensor protection at open circuit and breaking disconnection 9 2 3 Phase check function If the phase sequence is detected wrong or lack of 1 or 2 phase the unit...

Page 37: ...e of outdoor heat exchanger coil T3 is below 3 C reaches to 60 minutes then consecutive 3 minutes less than 4 degrees Just for the AC is turn on whether or not the heating mode the temperature was det...

Page 38: ...nds 3 Temperature of outdoor coil T3 is up to 15 C 9 3 1 5 High evaporator coil temp T2 protection 9 3 2 Cooling Mode 9 3 2 1 Four way valve is closed If four way valve is open before the machine ente...

Page 39: ...fan models Fan below When compressor is on the outdoor fan runs all the time Fan above T3 On Off 9 3 2 3 Indoor fan running rules In cooling mode indoor fan runs all the time and the speed can be sele...

Page 40: ...tart up Condition 2 TE6 T2 On Off TE5 2 When the evaporator coil temp T2 keeps lower than TE5 2 for 20 minutes the compressor and outdoor fan will shut off When T2 is higher than TE6 the compressor an...

Page 41: ...rature is 24 C 9 3 4 2 When entering auto mode the heating fan only or cooling operation will be automatically chosen according to the room temperature T1 and the set temperature Ts T1 Ts Cooling Heat...

Page 42: ...tting time is relative time 9 4 3 Economy function 9 4 3 1 It is valid in cooling heating and auto mode 9 4 3 2 Turning off changing mode or setting fan speed will cancel economy function 9 4 3 3 Oper...

Page 43: ...p models For other models Codes Contents P4 Temperature protection of indoor evaporator P5 Temperature protection of outdoor condenser P7 Temperature protection of compressor discharge P9 Anti cold wi...

Page 44: ...se sequence error Off Flash Flash Communication malfunction between indoor unit and outdoor unit Off Off On Open or short circuit of T3 temperature sensor Flash Off Off Open or short circuit of T4 tem...

Page 45: ...ange the batteries Air conditioner does not cool or heat well The temperature setting is too high or too low Set a more comfortable temperature The air filter is clogged with dust Clean the filter The...

Page 46: ...Floor Standing MFM DM16 01 01 25en Service manual 46 10 2 1 Open or short circuit of temperature sensor T1 T2 T3 T4 10 2 2 Open or short circuit of temperature sensor T5...

Page 47: ...47 Service manual 10 2 3 Default phase of compressor 10 2 4 Phase sequence error Phase sequence error Change the order of the wires to power supply Switch on the unit again If the problem cannot be s...

Page 48: ...perature protection of condenser Check the resistance of the temp sensor according to Appendix 1 is it normal Possible reason 1 Air or other gas in the refrigerant 2 Heat exchanger is dirty 3 Outdoor...

Page 49: ...tdoor ambient temp is low 2 The wires are loose to the temp sensor 3 The temp sensor is defective 4 The evaporator or the filter is dirty 5 System has block Low pressure protection Possible reason 1 T...

Page 50: ...Floor Standing MFM DM16 01 01 25en Service manual 50 10 2 9 Overload of current 1...

Page 51: ...DM16 01 01 25en Floor Standing MFM 51 Service manual 10 2 10 Communication malfunction between indoor unit and outdoor unit...

Page 52: ...Floor Standing MFM DM16 01 01 25en Service manual 52 10 2 11 Refrigerant Leakage Detection...

Page 53: ...DM16 01 01 25en Floor Standing MFM 53 Service manual 10 2 12 Temperature protection of compressor discharge...

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