Midea AAC-18ISCH Service Manual Download Page 52

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Service manual

13.3 Resetting phenomenon often occurs during operation

(That is automatically entering to the status when power is on.)
The reason is that the instantaneous voltage of main chip is less than 4.5V. Check according to the
following procedure:

13.4 Operation lamp flashes and Timer lamp off

Is connector connection good?

Is voltage being applied to the fan motor?

Fan motor is defective

Yes

Repair the connector.

Indoor PCB is defective.

13.5 Operation lamp flashes and Timer lamp on

Summary of Contents for AAC-18ISCH

Page 1: ...Content 1 MSC 18HRIN1 MSH 18HRIN1 AAC 18ISCH MSE 09HRIN2 MSE 12HRIN2 MSG 07CRIN2 MSG 09HRIN2 MSG 12HRIN2 MSG 09HRI MSG 12HRI MSG 21HRI MSG 24HRI...

Page 2: ...tion 13 7 Schematic diagram and Wiring diagram 14 7 1 Schematic diagram 14 7 2 Wiring diagram 18 8 Installation details 23 8 1 Wrench torque sheet for installation 23 8 2 Connecting the cables 23 8 3...

Page 3: ...39 11 12 Sleep mode 39 11 13 Auto restart function 39 11 14 Turbo function 39 11 15 Plasma 39 12 Model and Parameters 40 13 Troubleshooting 42 13 1 Indoor Unit Error Display 42 13 2 Diagnostic chart...

Page 4: ......

Page 5: ...very high and a door or a windows is left open Moisture may condense and wet or damage furniture Take care to ensure that power cable could not be pulled out or damaged during operation There is risk...

Page 6: ...a precision refrigerant system There is risk of damage or loss of property Do not block the inlet or outlet of air flow It may cause product failure Use a soft cloth to clean Do not use harsh deterge...

Page 7: ...cooling heating The unit will be turn off at the seventh hour Sleep mode auto control The function is usually used in rainy days in springtime or damp areas Independent dehumidification The louver can...

Page 8: ...uminum fin It is only operated in the heating operation mode except defrosting operation Anti rust cabinet Valve protection cover 4 way valve control Made from electrolytic zinc steel sheet and anti r...

Page 9: ...Service manual 5 3 Dimension 3 1 Indoor unit Alfa 3 2 Outdoor unit Alfa Dimension Mode W H D 12K 815 280 215 Dimension Mode W H D 12K 760 590 285...

Page 10: ...Service manual 6 3 3 Indoor unit Corona 3 4 Outdoor unit Corona Dimension Mode W H D 18K 920 292 225 Dimension Mode W H D L1 L2 L3 18K 845 695 335 560 360 560...

Page 11: ...ce manual 7 3 5 Indoor unit Inverter Eco 3 6 Outdoor unit Inverter Eco Dimension Mode W H D 7K 750 250 188 9K 750 250 188 12K 815 280 195 Dimension Mode W H D 7K 780 540 250 9K 780 540 250 12K 780 540...

Page 12: ...e manual 8 3 7 Indoor unit Inverter Star 3 8 Outdoor unit Inverter Star Dimension Mode W H D 7K 750 250 205 9K 750 250 205 12K 815 280 215 Dimension Mode W H D 7K 760 590 285 9K 760 590 285 12K 760 59...

Page 13: ...PG13D Brand Welling Welling Welling Welling Input W 45 55 39 5 44 Capacitor uF 1 5 1 5 1 2 1 5 Indoor fan motor Speed hi mi lo r min 1200 1150 1000 1140 1060 980 1250 1100 850 1180 1000 850 Indoor air...

Page 14: ...an motor Speed hi mi lo r min 1050 950 750 1100 1000 800 1060 900 800 Indoor air flow Hi Mi Lo m3 h 500 410 320 520 430 330 560 460 380 Indoor noise level Hi Mi Lo dB A 35 32 26 36 32 26 36 32 26 Mode...

Page 15: ...nput W 36 5 35 70 70 Capacitor uF 1 2 1 0 3 0 3 0 Indoor fan motor Speed hi mi lo r min 1100 1020 950 1060 900 800 1150 1050 950 1150 1050 950 Indoor air flow Hi Mi Lo m3 h 500 430 330 540 460 380 115...

Page 16: ...Service manual 12 5 Refrigerant cycle diagram...

Page 17: ...t from the continuous operation under constant air temperature conditions However excludes the initial pull down stage 6 2 Heating operation Indoor air temp DB Outdoor unit air temp DB Note The chart...

Page 18: ...25V R4 11K 2W DZ2 12V D5 IN4007 R5 11K 2W L N R2 51 1W INDOORFAN 1 2 CN9 N ZR1 14D681K C5 333 250VAC 1 2 CN2 TRANS_IN t PTC1 82RM 1 2 3 4 5 CN1 FAN_IN IC1 PC817 FUSE1 3 15A 250V 14 5VAC 350mA C3 104...

Page 19: ...Sensor 5V 5V C6 R10 R9 5V IPM C1 R31 R12 D3 R21 R22 C10 C11 CT1 4148 R24 EMU1 EMU0 VSS VDD NC IOPC1 1 2 3 4 5 6 7 8 9 10 CZ2 5 12 Pro Pro 5V C22 C20 R23 1 2 3 IC1 C12 5 C13 1 2 3 4 5 6 7 8 9 10 11 12...

Page 20: ...Service manual 16 7 1 5 Indoor main PCB Inverter Eco...

Page 21: ...Service manual 17 7 1 6 Outdoor main PCB Inverter Eco...

Page 22: ...Service manual 18 7 2 Wiring diagram 7 2 1 MSH 18HRDN1...

Page 23: ...Service manual 19 7 2 2 MSC 18HRIN1...

Page 24: ...Service manual 20 7 2 3 MSE 09HRIN2 MSE 12HRIN2...

Page 25: ...Service manual 21 7 2 4 MSG 07HRIN2 MSG 09HRIN2 MSG 12HRIN2 1 Indoor unit 7 9K 2 Indoor unit 12K...

Page 26: ...Service manual 22 3 Outdoor unit...

Page 27: ...7K 9K 12K 16K 18K mm2 1 0 1 0 1 5 2 5 2 5 8 3 Pipe length and the elevation Pipe size Capacity Btu h GAS LIQUID Standard length m Max Elevation B m Max Elevation B m Additional refrigerant g m 3 8 9 5...

Page 28: ...eck the flare connection for gas leakage 4 Purge the air from the system Set the 2 way valve to the open position and remove the cap from the 3 way valve s service port Using the hexagonal wrench to p...

Page 29: ...charge hose with the push pin to the gas service port 4 Air purging of the charge hose Open the low pressure valve on the charge set slightly to purge air from the charge hose 5 Set the 2 way valve to...

Page 30: ...1 minutes repeat 3 times After purging the air use a torque wrench to tighten the flare nut to on the 2 way valve 4 Check the gas leakage Check the flare connections for gas leakage 5 Discharge the r...

Page 31: ...he service port 3 Open the valves Low side on the charge set and discharge the refrigerant until the gauge indicates 0 05 to 0 1 Mpa If there is no air in the refrigeration cycle the pressure when the...

Page 32: ...has moved toward 0 1 Mpa 76 cmHg vacuum of 4 mmHg or less 3 Close the valve Low side on the charge set turn off the vacuum pump and confirm that the gauge needle does not move approximately 5 minutes...

Page 33: ...e specified amount of refrigerant if can be charged with a little at a time approximately 150g each time0 while operating the air conditioner in the cooling cycle however one time is not sufficient wa...

Page 34: ...34 5 34 0 31 0 28 5 27 5 18 C Pressure kg cm2 35 0 34 5 35 5 32 5 29 5 28 0 20 C Pressure kg cm2 36 5 35 5 36 0 33 5 30 0 28 5 22 C Pressure kg cm2 36 5 37 0 36 5 35 0 32 5 29 5 9 2 MSC 18HRIN1 Cooli...

Page 35: ...31 5 409 6 092 6 319 5 613 4 782 3 500 Sensitive capacity kW 3 698 4 056 4 569 4 839 4 207 3 586 2 625 32 C D 23 C W Input kW 0 704 1 206 1 755 2 213 2 118 1 962 1 720 HEATING OUTDOOR CONDITIONS Indoo...

Page 36: ...6 092 6 319 5 613 4 782 3 500 Sensitive capacity kW 3 698 4 056 4 569 4 839 4 207 3 586 2 625 32 C D 23 C W Input kW 0 704 1 206 1 755 2 213 2 118 1 962 1 720 HEATING OUTDOOR CONDITIONS Indoor Conditi...

Page 37: ...NDITIONS Indoor Conditions 12 C D 11 C W 7 C D 6 C W 4 C D 3 C W 0 C D 1 C W 4 C D 6 C W 15 C 18 C 20 C 22 C 10 4 MSG 12HRI SUMMER Cooling mode Indoor Conditions 25 C 30 C 35 C 40 C 45 C 50 C 21 C D T...

Page 38: ...NDITIONS Indoor Conditions 12 C D 11 C W 7 C D 6 C W 4 C D 3 C W 0 C D 1 C W 4 C D 6 C W 15 C 18 C 20 C 22 C 10 6 MSG 24HRI SUMMER Cooling mode Indoor Conditions 25 C 30 C 35 C 40 C 45 C 50 C 21 C D T...

Page 39: ...frequency 11 2 Protection 11 2 1 3 minutes delay at restart for compressor 11 2 2 Temperature protection of compressor top compressor stops when the temp of top of compressor is more than 115 compress...

Page 40: ...iously selected 11 5 Dehumidifying mode 11 5 1 The 4 way valve is off 11 5 2 the indoor fan is fixed in breeze speed 11 5 3 Compressor run in low frequency 11 5 4 Low room temperature protection 11 5...

Page 41: ...to setting temp indoor changes to breeze speed immediately after 127 second indoor fan stop 11 6 5 Auto wind at heating mode Condition T Indoor Temp Setting Temp Indoor fan speed T 1 5 High 1 5 T 2 5...

Page 42: ...ature of outdoor heat exchanger remains consecutively lower than 3 c for more than 120 minutes and the temperature remains consecutively 2 c for more than 3 minutes 11 7 2 Ending condition of defrosti...

Page 43: ...irst turn on the A C it will be automatically off at set time and later be on at the set time then unit turns off at set time 11 12 Sleep mode 11 12 1 It is available at cooling heating or auto mode 1...

Page 44: ...980 980 FANSLOW 900 900 F1 42 42 F2 47 47 F3 52 52 F4 55 55 F5 58 58 F6 64 64 F7 70 70 F8 76 76 F9 82 82 F10 88 88 I1COOL 12 12 I2COOL 14 5 14 5 I3COOL 18 18 I1HEAT 12 5 12 5 I2HEAT 15 15 I3HEAT 19 19...

Page 45: ...44 57 F4 59 62 F5 63 72 F6 66 82 F7 73 88 F8 76 92 F9 95 103 F10 105 107 I1Cool 7 0 8 5 I2Cool 8 0 10 0 I3Cool 10 5 12 I1Heat 8 5 10 5 I2Heat 10 0 12 0 I3Heat 12 0 13 5 TCDI 9 9 TCDE1 20 20 RACFAN 12...

Page 46: ...rature sensor open or short circuit of P0 Module protection P1 Over voltage or too low voltage protection P2 Compressor top protection against temperature P3 Outdoor low temp protection P4 Inverter co...

Page 47: ...ly turn on the unit using remote controller does the unit work normally Replace the module board The power supply of PCB is supplied by the module board Replace the outdoor power supply board Yes Is t...

Page 48: ...r connection good Is voltage being applied to the fan motor rang 90v 160v between mid pin and N on CN1 Indoor fan motor is defective Repair the connector Indoor PCB is defective No Yes No Is connectio...

Page 49: ...the wires to compressor right Check the inverter module If some component cracked or damaged Is it breakdown between P N P U P V N W N U N V At inverter module Check compressor Inverter module is defe...

Page 50: ...Does compressor operate Is refrigerant circulation volume normal Gas charging Is abnormality the same after gas charging Check refrigerant system such as clogging of ill t Is protector normal Check th...

Page 51: ...Service manual 47 13 2 Diagnostic chart After energizing no indicator is lighted and the air conditioner can t be operated...

Page 52: ...s that the instantaneous voltage of main chip is less than 4 5V Check according to the following procedure 13 4 Operation lamp flashes and Timer lamp off Is connector connection good Is voltage being...

Page 53: ...13 7 Operation lamp on and Timer lamp flashes EEROM error indoor PCB is defective 13 8 Operation lamp flashes Timer lamp flashes This is alarm signal when the main chip can t detect over zero signal...

Page 54: ...25 10 52 3 1918 1 37 1988 26 9 5507 53 3 0707 0 35 2024 27 9 1245 54 2 959 1 33 3269 28 8 7198 55 2 8442 2 31 5635 29 8 3357 56 2 7382 3 29 9058 30 7 9708 57 2 6368 4 28 3459 31 7 6241 58 2 5397 5 26...

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