Friedrich MM18YJ Service Manual Download Page 20

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Compressor interface

Compressor overload protector

Temperature sensor

Electric expansion valve

Fan HALL interface

Outdoor fan

4-way valve

Communication interface with
indoor unit

Live wire

Earthing wire

Neutral wire

Reactor interface 1

PFC capacitor interface

Reactor interface 2

Summary of Contents for MM18YJ

Page 1: ...0RGHOV 0 0 050 0 0 050 5HIULJHUDQW 5 Service Manual...

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Page 7: ...Conditions Indoor DB80 F WB66 9 F Outdoor DB95 F WB75 F Indoor air flow Super High Pipe length 24 6ft Conditions Indoor DB70 F WB60 F Outdoor DB47 F WB43 F Indoor air flow Super High Pipe length 24 6...

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Page 9: ...79 18 54 14 54 1 85 Outdoor Air Temp 64 53 68 57 72 61 77 64 MM18YJ Indoor Air Temperature DB WB F 80 67 86 72 90 75 DB TC SHC PI TC SHC PI TC SHC PI TC SHC PI TC SHC PI TC SHC PI TC SHC PI 14 12 81 1...

Page 10: ...5 43 2 62 24 92 2 65 24 33 2 73 75 86 MM18YJ Heating Indoor Air Temperature DB Outdoor Air Temp 60 64 68 70 72 F DB F WB TC PI TC PI TC PI TC PI TC PI TC PI TC PI 3 4 14 36 1 73 13 96 1 77 13 82 1 8 1...

Page 11: ...side noise when blowing Outdoor side noise when blowing MWM18Y3J MWM24Y3J MRM18Y3J MRM24Y3J 60 60 60 80 100 50 50 40 40 40 30 30 20 20 20 10 0 0 Indoor Fan Motor Rotating Speed Noice dB A low Middle H...

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Page 14: ...Valve Valve Liquid pipe side Gas pipe side Accumlator Compressor Strainer Strainer Capillary 5HIULJHUDQW SLSH GLDPHWHU LTXLG LQFK DV LQFK 0 0 050 0 0 050 Indoor unit Outdoor unit COOLING HEATING 4 Wa...

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Page 16: ...2 L1 BN RD C1 20YEGN X1 C2 PFCC1 18YE 19YE PFCC2 POWER G 7BU 8BN L2 L1 G INDOOR UNIT FAN MOTOR COMP INDC2 13OG YEGN SAT 4WH 5WH OVC COMP OFAN G 12WH 3RD 2BU 1YE INDC1 L M 4V COM INNER 1 G 17RD 15YE 16...

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Page 20: ...Compressor interface 2 Compressor overload protector 3 Temperature sensor 4 Electric expansion valve 5 Fan HALL interface 6 Outdoor fan 7 4 way valve 8 Communication interface with indoor unit 9 Live...

Page 21: ...temperature and blank is displayed circularly SLEEP icon again to clear the display is displayed by pressing the SLEEP button Press this button 19 icon AIR SWEEP again to clear the display 16 17 LOCK...

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Page 31: ...inch At least 5 8 9 inch Space to the wall S p a c e t o t h e o b s t r u c t i o n r o o l f e h t o t e c a p S Space to the obstruction Drainage pipe Space to the wall Space to the obstruction Spa...

Page 32: ...r unit Make the bound pipes pass through the wall hole and then connect outdoor unit Neaten the pipes Vacuum pumping and leakage detection Check after installation and test operation Finish installati...

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Page 42: ...eplace the controller with one ofthe same model End no no no no yes yes Malfunction is removed no yes yes no Is the wiring terminal between temperature sensor and the controller loosened or poor ly co...

Page 43: ...PG motor tightly no no Stir the blade by hand to see whether the blade rotate s smoothly Reinstall the blade and motor correctly Is malfunction eliminated no no yes yes Turn on the unit again measure...

Page 44: ...r improperly Re insert the jumper cap The mainboard is defined abnormal replace it Yes No Yes End Is the malfunction eliminated No No Yes Replace the jumper cap No Yes Is the malfunction eliminated Is...

Page 45: ...ressor running abnormally Is there abnormal sound or oil leakage is the temperature of the shell too high etc no no no no yes no no Replace the control panel End Normal fluctuation is within 10 of the...

Page 46: ...OODWLRQ DQG 0DLQWHQDQFH 6HUYLFH 0DQXDO 2XWGRRU XQLW H GHWHFWLRQ SRLQW Test 1 Test 2 Test 3 Test 4 Test 5 Test 6 Test 7 Test 8 Test 9 Test 12 C A B D E F G H I J K L M Test 10 N Test 14 S T Test 11 Tes...

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Page 48: ...ltage testing circuit on control panel AP1 Replace the control panel AP1 Measure the AC voltage between terminalL andN on wiring board XT power supply Voltage within 210VAC 250VAC Shut down the power...

Page 49: ...tions resulting in that the system pressure becomes too high The connection of capacitor C2 is loose Reconnect the capacitor C2 according to Electrical Wiring Diagram Then Restart the unit Stop the un...

Page 50: ...eck if fan terminal OFAN is connected well 2 Test if resistance value of any two terminals is less than 1k with ohmic meter If the indoor and outdoor fan work well After the unit de energized for 20mi...

Page 51: ...P UVW is well connected and connection sequence is correct Replace control board AP1 Replace the compressor If malfunction is removed If the stop time of compressor is more than 3min N If the stop tim...

Page 52: ...rks normally If the stop time of compressor is more than 3min Synchronism after energize the unit and start it Connect wire well Synchronism occurred during operation Replace control board AP1 If the...

Page 53: ...agram Replace EKV coil of electron expansion valve If the wiring terminal FA of electron expansion is well connected Remove malfunction The resistance value of first 4 l ead foot an d th e fifth lead...

Page 54: ...apacity is short circuit and replace it Y Re energize the unit and start it Cut the terminal of reactor test the resistance between two terminals of reactor with ohmic meter Replace the reactor Re ene...

Page 55: ...Check communication circuit of outdoor unit Problem of communication circuit Check built in wiring of indoor and outdoor unit Connection correct Malfunction of circuit is detected with control board A...

Page 56: ...ing Outdoor unit malfunction Test voltage value with Test 13 18K 11 24K position in diagram with voltage meter Number jumping Test voltage value with Test 10 position in diagram with voltage meter Num...

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