Mitsubishi Electric MUZ-HM09NA Service Manual Download Page 65

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11-2. MUZ-HM24NA MUZ-HM24NAH MUZ-HM24NA2

NOTE:

Turn OFF the power supply before disassembly.

OPERATING PROCEDURE

PHOTOS/FIGURES

1. Removing the cabinet

(1) Remove the screws of the service panel.

(2) Remove the screws of the top panel.

(3) Remove the screw of the valve cover.

(4) Remove the service panel.

(5) Remove the screws fixing the conduit cover.

(6) Remove the conduit cover.

(7) Remove the screw of fixing the conduit plate.

(8) Remove the conduit plate.

(9) Remove the top panel.

(10) Remove the valve cover.

(11) Disconnect the power supply and indoor/outdoor connect-

ing wire.

(12) Remove the screws of the cabinet.

(13) Remove the cabinet.

(14) Remove the screws of the back panel.

(15) Remove the back panel.

Photo 3

Photo 4

Photo 1

Photo 2

Screws of the cabinet

Screws of the top panel

Screw of the back panel

Screws of the cabinet

Screws of

the cabinet

Screws of the service panel

Screw of

the valve

cover

Screws of

the cabinet

Screws of

the back panel

Screws

of the

cabinet

Screws of the conduit cover

Screw of the conduit plate

OBH747F

Summary of Contents for MUZ-HM09NA

Page 1: ...RT NAMES AND FUNCTIONS 3 3 SPECIFICATION 4 4 OUTLINES AND DIMENSIONS 9 5 WIRING DIAGRAM 11 6 REFRIGERANT SYSTEM DIAGRAM 16 7 DATA 20 8 ACTUATOR CONTROL 33 9 SERVICE FUNCTIONS 34 10 TROUBLESHOOTING 35 11 DISASSEMBLY INSTRUCTIONS 60 OBH747 REVISED EDITION E is void OUTDOOR UNIT Revision F 1 TECHNICAL CHANGES for MUZ HM09 12 15 18NA U2 have been corrected Power consumptions for MUZ HM15 18 24NA MUZ H...

Page 2: ...MUZ HM15 18NA U1 MUZ HM15 18NA2 U1 and MUZ HM24NA2 U1 have been added Revision B 3 SPECIFICATION has been modified Revision C MUZ HM09 12NA U1 MUZ HM09 12NA2 U1 have been added Revision D Capacity corrections have been corrected 7 1 2 3 Revision E MUZ HM09 12 15 18NA U2 and MUZ HM09 12 15 18 24NAH U1 have been added Revision F 1 TECHNICAL CHANGES for MUZ HM09 12 15 18NA U2 have been corrected Powe...

Page 3: ...hanged 5 Outdoor heat exchanger has been changed 6 4 way valve has been changed 7 Compressor has been changed MUZ HM15NA U1 MUZ HM15NA U2 MUZ HM18NA U1 MUZ HM18NA U2 1 Fan motor has been changed 2 Inverter P C board has been changed 3 LEV has been changed MUZ HM09NAH U1 MUZ HM12NAH U1 MUZ HM15NAH U1 MUZ HM18NAH U1 MUZ HM24NAH U1 1 New model MUZ HM24NA MUZ HM24NA2 MUZ HM24NAH Piping Air outlet Drai...

Page 4: ...2 Refrigeration oil fl oz L Model 9 1 0 27 FV50S 10 8 0 32 NEO22 Refrigerant control Linear expansion valve Sound level 1 Cooling dB A 46 Heating dB A 50 Airflow High Med Low Cooling CFM 1 063 1 063 1 063 Heating CFM 1 282 1 105 1 105 1 240 1 105 1 105 Fan speed High Med Low Cooling rpm 740 740 740 Heating rpm 890 770 770 860 770 770 Defrost method Reverse cycle Dimensions W in 31 1 2 D in 11 1 4 ...

Page 5: ...on oil fl oz L Model 9 1 0 27 FV50S 10 8 0 32 NEO22 Refrigerant control Linear expansion valve Sound level 1 Cooling dB A 49 Heating dB A 51 Airflow High Med Low Cooling CFM 1 063 1 063 1 063 1 102 1 102 639 Heating CFM 1 282 1 105 1 105 1 186 1 116 1 045 Fan speed High Med Low Cooling rpm 740 740 740 810 810 490 Heating rpm 890 770 770 870 820 770 Defrost method Reverse cycle Dimensions W in 31 1...

Page 6: ...oil fl oz L Model 11 8 0 35 FV50S 11 8 0 35 FV50S Refrigerant control Linear expansion valve Sound level 1 Cooling dB A 49 49 Heating dB A 51 51 Airflow High Med Low Cooling CFM 1 102 1 102 639 1 102 1 102 639 Heating CFM 1 186 1 045 1 045 1 186 1 045 1 045 Fan speed High Med Low Cooling rpm 810 810 490 810 810 490 Heating rpm 870 770 770 870 770 770 Defrost method Reverse cycle Dimensions W in 31...

Page 7: ...ation oil fl oz L Model 11 8 0 35 FV50S Refrigerant control Linear expansion valve Sound level 1 Cooling dB A 54 Heating dB A 55 Airflow High Med Low COOL CFM 1 742 1 742 922 HEAT CFM 1 691 1 691 1 372 Fan speed High Med Low Cooling rpm 840 840 450 Heating rpm 810 810 650 Defrost method Reverse cycle Dimensions W in 33 1 16 D in 13 H in 34 5 8 Weight Ib 121 External finish Munsell 3Y 7 8 1 1 Refri...

Page 8: ... 60 17 15 H0 1 Heating steady state at minimum compressor speed 70 60 62 56 5 H1 1 Heating steady state at minimum compressor speed 70 60 47 43 H2 V Heating at intermediate compressor speed 5 70 60 35 33 5 at intermediate compressor speed Rated compressor speed minimum compressor speed 3 minimum compressor speed 3 4 2 OPERATION Mode Condition Intake air temperature F Indoor Outdoor DB WB DB WB Coo...

Page 9: ...pipe flared Ø 1 4 Gas refrigerant pipe joint Refrigerant pipe flared Ø 3 8 HM09 12 Ø 1 2 HM15 18 REQUIRED SPACE clear 1 1 4 in 100 mm or more when front and sides of the unit are clear 2 When any 2 sides of left right and rear of the unit are clear holes MUZ HM09NA MUZ HM09NA2 MUZ HM09NAH MUZ HM12NA MUZ HM12NA2 MUZ HM12NAH MUZ HM15NA MUZ HM15NA2 MUZ HM15NAH MUZ HM18NA MUZ HM18NA2 MUZ HM18NAH OBH74...

Page 10: ...panel 3 29 32 6 1 2 7 11 16 3 5 4 4 Liquid refrigerant pipe joint Refrigerant pipe flared Ø 3 8 Gas refrigerant pipe joint Refrigerant pipe flared Ø 5 8 1 20 in 500 mm or more when front and sides of the unit are clear 14 in 350 mm or more 4 in 100 mm or more REQUIRED SPACE Clear 1 4 in 100 mm or more 20 in 500 mm or more 2 2 When any 2 sides of left right and rear of the unit are clear OBH747F ...

Page 11: ...11 5 WIRING DIAGRAM MUZ HM09NA U1 MUZ HM09NA2 U1 MUZ HM12NA U1 MUZ HM12NA2 U1 MUZ HM09NA U2 MUZ HM12NA U2 OBH747F ...

Page 12: ...12 MUZ HM09NAH MUZ HM12NAH MUZ HM09NA U8 MUZ HM09NA2 U8 MUZ HM12NA U8 MUZ HM12NA2 U8 OBH747F ...

Page 13: ...13 MUZ HM15NA U1 MUZ HM15NA2 U1 MUZ HM18NA U1 MUZ HM18NA2 U1 MUZ HM15NA U2 MUZ HM18NA U2 OBH747F ...

Page 14: ...14 MUZ HM15NAH MUZ HM18NAH OBH747F ...

Page 15: ...15 MUZ HM24NA MUZ HM24NA2 MUZ HM24NAH OBH747F ...

Page 16: ...heat exchanger temperature thermistor RT68 Service port Service port Muffler Unit Inch mm Flared connection Discharge temperature thermistor RT62 Flared connection Stop valve with strainer Stop valve with service port Refrigerant flow in cooling Compressor 4 way valve Refrigerant flow in heating Refrigerant pipe ø3 8 ø9 52 with heat insulator Refrigerant pipe ø1 4 ø6 35 with heat insulator R V coi...

Page 17: ...ator Stop valve with service port Muffler MUZ HM15NA MUZ HM15NA2 MUZ HM15NAH MUZ HM18NA MUZ HM18NA2 MUZ HM18NAH MUZ HM12NA U8 MUZ HM12NA2 U8 Outdoor heat exchanger Flared connection Defrost thermistor RT61 Discharge temperature thermistor RT62 Flared connection Stop valve with strainer Stop valve with service port Refrigerant flow in cooling Compressor 4 way valve Refrigerant flow in heating Refri...

Page 18: ... 094 7 7 8 ø4 0 ø2 4 200 Refrigerant flow in cooling Compressor 4 way valve Refrigerant flow in heating Refrigerant pipe ø5 8 ø15 88 with heat insulator Refrigerant pipe ø3 8 ø9 52 with heat insulator LEV R V coil heating ON cooling OFF Muffler with 100 mesh strainer Strainer 100 Outdoor heat exchanger temperature thermistor RT68 Strainer 100 Muffler Capillary tube O D 0 118 I D 0 079 7 7 8 ø3 0 ø...

Page 19: ...s additional refrigerant charge according to the calculation Model Outdoor unit precharged Refrigerant piping length one way ft 25 30 40 50 60 65 MUZ HM09NA H MUZ HM09NA2 MUZ HM12NA U1 U2 MUZ HM12NAH U1 MUZ HM12NA2 U1 1 lb 12 oz 0 1 08 3 24 5 40 7 56 8 64 MUZ HM12NA U8 MUZ HM12NA2 U8 MUZ HM15NA H MUZ HM15NA2 2 lb 9 oz MUZ HM18NA H MUZ HM18NA2 2 lb 10 oz Calculation X oz 1 08 5 oz ft Refrigerant pi...

Page 20: ...1 21 1 15 3 1 46 19 7 14 3 1 60 18 5 13 4 1 72 17 2 12 5 1 81 15 8 11 5 1 89 67 20 0 17 2 1 38 18 6 16 0 1 52 17 2 14 8 1 64 16 0 13 8 1 74 14 7 12 6 1 82 63 18 7 18 6 1 31 17 4 17 3 1 45 16 2 16 1 1 57 14 7 14 6 1 67 13 4 13 3 1 74 MUZ HM24NA H MUZ HM24NA2 71 27 6 20 9 2 34 25 8 19 5 2 56 24 2 18 3 2 76 22 5 17 0 2 91 20 7 15 7 3 02 67 26 1 23 2 2 21 24 3 21 6 2 43 22 5 20 0 2 63 20 9 18 6 2 79 1...

Page 21: ... 0 0 86 11 3 1 10 14 1 1 31 16 5 1 47 18 5 1 55 19 1 1 57 21 4 1 65 MUZ HM24NA H MUZ HM24NA2 75 11 4 1 48 15 1 1 86 18 9 2 19 22 5 2 44 25 4 2 56 26 1 2 60 29 6 2 70 70 12 4 1 41 16 0 1 80 19 5 2 14 23 0 2 38 26 0 2 50 26 8 2 55 30 3 2 65 65 13 0 1 35 16 4 1 73 20 4 2 06 23 8 2 31 26 8 2 44 27 6 2 48 30 9 2 60 NOTE 1 IDB Intake air dry bulb temperature TC Total Capacity x103 Btu h TPC Total Power ...

Page 22: ...ption kW MUZ HM09NA H MUZ HM09NA2 MUZ HM12NA H MUZ HM12NA2 MUZ HM24NA H MUZ HM24NA2 MUZ HM18NA H MUZ HM18NA2 71 67 63 65 75 85 95 105 115 1 0 1 2 1 4 1 6 1 8 2 0 2 2 Indoor intake air WB temperature F SHF at rating condition 0 86 625 CFM Airflow Outdoor intake air DB temperature F Total power consumption kW MUZ HM15NA H MUZ HM15NA2 This value of frequency is not the same as the actual frequency in...

Page 23: ... consumption kW 75 70 65 75 70 65 0 10 20 30 40 50 60 70 0 4 0 6 0 8 1 0 1 2 1 4 Indoor intake air DB temperature F 406 CFM Airflow Outdoor intake air WB temperature F Total power consumption kW MUZ HM15NA H MUZ HM15NA2 MUZ HM18NA H MUZ HM18NA2 75 70 65 5 5 15 25 35 45 55 65 0 5 0 8 1 1 1 4 1 7 2 0 Indoor intake air DB temperature F 463 CFM Airflow Outdoor intake air WB temperature F Total power c...

Page 24: ...70 MUZ HM12NA U8 MUZ HM12NA2 U8 PSIG 6870 75 80 85 90 95 100 105 F 260 300 340 380 420 PSIG 6870 75 80 85 90 95 100 105 F 110 130 150 170 190 Condensing pressure 86 80 75 70 Suction pressure Indoor DB temperature F Outdoor ambient temperature 86 80 75 70 Indoor DB temperature F Outdoor ambient temperature MUZ HM12NA U1 U2 MUZ HM12NA2 U1 MUZ HM12NAH 70 75 80 85 90 95 100 105 100 120 140 160 180 PSI...

Page 25: ...350 400 450 500 550 F F 65 70 75 80 85 90 95 100 105 80 100 120 140 160 180 200 PSIG Condensing pressure Suction pressure Outdoor ambient temperature Indoor DB temperature F PSIG Indoor DB temperature F Outdoor ambient temperature 86 80 75 70 86 80 75 70 65 70 75 80 85 90 95 100 105 200 250 300 350 400 450 500 F F 65 70 75 80 85 90 95 100 105 60 80 100 120 140 160 180 PSIG Condensing pressure Suct...

Page 26: ...UZ HM12NA U1 U2 MUZ HM12NA2 U1 MUZ HM12NAH MUZ HM12NA U8 MUZ HM12NA2 U8 5 15 25 35 45 55 65 75 F 5 15 25 35 45 55 65 75 F 60 85 110 135 160 185 210 260 300 340 380 420 460 Indoor DB temperature F Condensing pressure Outdoor ambient temperature PSIG PSIG 75 70 65 58Hz Indoor DB temperature F Suction pressure Outdoor ambient temperature 75 70 65 58Hz MUZ HM15NA H MUZ HM15NA2 75 70 65 75 70 65 PSIG C...

Page 27: ...door DB temperature F 5 15 25 35 45 55 65 75 50 75 100 125 150 175 200 Indoor DB tem perature F 81Hz 75 70 65 75 70 65 PSIG Condensing pressure Outdoor ambient temperature F F PSIG Suction pressure Outdoor ambient temperature 5 15 25 35 45 55 65 75 250 300 350 400 450 500 58Hz Indoor DB temperature F 5 15 25 35 45 55 65 75 50 75 100 125 150 175 200 Indoor DB tem perature F 58Hz MUZ HM18NA H MUZ HM...

Page 28: ...877 Comp current A 3 64 3 29 4 25 3 85 3 32 3 00 3 66 3 31 Fan motor current A 0 27 0 24 0 30 0 27 0 27 0 24 0 30 0 27 Refrigerant circuit Condensing pressure PSIG 384 331 389 331 Suction pressure PSIG 152 102 151 103 Discharge temperature F 151 155 154 152 Condensing temperature F 113 101 115 103 Suction temperature F 58 41 59 39 Comp shell bottom temperature F 146 149 151 149 Ref pipe length ft ...

Page 29: ... 5 61 5 08 4 56 4 13 4 39 3 97 5 41 4 89 Fan motor current A 0 27 0 24 0 30 0 27 0 34 0 31 0 31 0 28 Refrigerant circuit Condensing pressure PSIG 429 347 389 397 Suction pressure PSIG 135 99 133 104 Discharge temperature F 180 165 163 162 Condensing temperature F 120 104 115 116 Suction temperature F 60 41 56 35 Comp shell bottom temperature F 174 157 158 158 Ref pipe length ft 25 Refrigerant char...

Page 30: ... 10 05 10 56 9 55 Fan motor current A 0 41 0 37 0 40 0 36 0 41 0 37 0 40 0 36 1 05 0 95 1 05 0 95 Refrigerant circuit Condensing pressure PSIG 396 427 423 361 404 403 Suction pressure PSIG 138 98 144 99 127 94 Discharge temperature F 168 178 165 161 174 194 Condensing temperature F 115 120 120 108 116 116 Suction temperature F 61 31 54 35 54 44 Comp shell bottom temperature F 152 158 149 143 173 1...

Page 31: ...2NA U8 MUZ HM12NA2 U8 0 50 100 Hz 0 5 1 0 1 5 0 50 100 Hz 0 5 1 0 1 5 0 50 100 150 Hz 0 5 1 0 1 5 0 50 100 150 Hz 0 5 1 0 1 5 2 0 Capacity correction factors Correction of Cooling capacity The operational frequency of compressor Correction of Cooling total input The operational frequency of compressor Correction of Heating total input The operational frequency of compressor Correction of Heating c...

Page 32: ...e operational frequency of compressor Correction of Heating capacity The operational frequency of compressor Hz Hz Hz Hz 0 25 50 75 100 0 5 1 0 1 5 2 0 0 25 50 75 100 0 5 1 0 1 5 2 0 0 50 100 150 0 5 1 0 1 5 2 0 0 50 100 150 0 5 1 0 1 5 2 0 0 25 50 75 100 0 5 1 0 1 5 2 0 0 25 50 75 100 0 5 1 0 1 5 2 0 0 50 100 150 0 5 1 0 1 5 2 0 0 50 100 150 0 5 1 0 1 5 2 0 MUZ HM15NA H MUZ HM15NA2 MUZ HM18NA H M...

Page 33: ... coil Indoor fan motor Defrost heater Discharge temperature thermistor Protection Indoor coil temperature thermistor Cooling Coil frost prevention Heating High pressure protec tion Defrost thermistor Heating Defrosting Fin temperature thermistor Protection Ambient temperature thermistor Cooling Low ambient tempera ture operation Heating Defrosting Heater Outdoor heat exchanger tem perature thermis...

Page 34: ...ture The pre heat control prevents this interference The pre heat control turns ON when the discharge temperature ther mistor is 68 F 20 C or below When the pre heat control turns ON the compressor is energized About 50 W Pre heat control setting JK ON To activate the pre heat control cut JK wire of the inverter P C board OFF To deactivate the pre heat control solder JK wire of the inverter P C bo...

Page 35: ... to apply stress on the components 5 When connecting or disconnecting the connectors hold the connector housing DO NOT pull the lead wires 3 Troubleshooting procedure 1 Check if the OPERATION INDICATOR lamp on the indoor unit is blinking on and off to indicate an abnormality To make sure check how many times the OPERATION INDICATOR lamp is blinking on and off before starting service work See the s...

Page 36: ...inking does the upper lamp of the OPERATION INDICATOR lamp stay ON for 3 seconds When it stays ON for 3 seconds without beep The outdoor unit is abnormal The indoor unit is abnormal Check the blinking pattern and identify the abnormal point by referring to the table of indoor unit failure mode recall function Refer to indoor unit service manual Make sure to check at least 2 consecutive blinking cy...

Page 37: ...ng pattern and identify the abnormal point by referring to the table of outdoor unit failure mode recall function 10 2 3 Make sure to check at least 2 consecutive blinking cycles 2 Releasing the failure mode recall function Release the failure mode recall function by the following procedures Turn OFF the power supply and turn it ON again Press RESET button of the remote controller Repair the failu...

Page 38: ... inverter compressor 5 time blink 2 5 seconds OFF Discharge temperature Temperature of discharge temperature thermistor exceeds 241 F 116 C compressor stops Compressor can restart if discharge temperature thermistor reads 212 F 100 C or less 3 minutes later Check the refrigerant circuit and the refrigerant amount Refer to 10 5 Check of LEV 6 time blink 2 5 seconds OFF High pressure Temperature of ...

Page 39: ...er module IPM 1 The compressor winding shorts circuit Reconnect compressor connector Refer to 10 5 How to check inverter compressor 14 time blink 2 5 seconds OFF Stop valve Closed valve 14 time blink 2 5 seconds OFF Closed valve is detected by compressor current Check the stop valve 4 way valve Pipe temperature 16 time blink 2 5 seconds OFF The 4 way valve does not work properly The indoor coil th...

Page 40: ...ve Compressor synchronous abnormality Compressor start up failure protection 12 time blink 2 5 seconds OFF Waveform of compressor current is distorted Reconnect compressor connector Refer to 10 5 How to check inverter compressor 5 time blink 2 5 seconds OFF Discharge temperature Temperature of discharge temperature thermistor exceeds 241 F 116 C compressor stops Compressor can restart if discharge...

Page 41: ...h phase current of compressor cannot be detected normally 14 time blink 2 5 seconds OFF Stop valve Closed valve 14 time blink 2 5 seconds OFF Closed valve is detected by compressor current Check stop valve 4 way valve Pipe temperature 16 time blink 2 5 seconds OFF The 4 way valve does not work properly The indoor coil thermistor detects an abnormal temperature Check the 4 way valve Replace the inv...

Page 42: ... MUZ HM09 12NA 2 U8 IC700 MUZ HM09 12 15 18 24NA 2 U1 MUZ HM09 12 15 18 24NAH MUZ HM09 12 15 18NA U2 When overcurrent protection occurs within 10 seconds after compressor starts compressor restarts after 15 seconds MUZ HM09 12NA Reconnect connector of compres sor Refer to 10 5 How to check inverter compressor Check stop valve 9 3 time blink 2 5 seconds OFF Discharge tem perature overheat protectio...

Page 43: ...rigerant circuit and refrig erant amount 21 8 time blink 2 5 seconds OFF PAM protection PAM Pulse Ampli tude Modulation The overcurrent flows into IGBT Insulated Gate Bipolar tran sistor TR821 MUZ HM09 12NA 2 U8 PFC Power factor correction IC820 MUZ HM09 12 15 18 24NA 2 U1 MUZ HM09 12 15 18 24NAH MUZ HM09 12 15 18NA U2 MUZ HM24NAH or the bus bar voltage reaches 320 V MUZ HM09 12NA 2 U8 394 V MUZ H...

Page 44: ... Compressor Measure the resistance between terminals using a tester Temperature 14 104 F 10 40 C Normal Ω HM09 12NA 2 U1 HM09 12NA U2 HM09 12NAH U1 HM09NA U8 HM12NA U8 HM15 18 24 U V U W V W 1 26 1 72 1 59 2 16 1 36 1 93 1 52 2 17 0 82 1 11 W U V WHT RED BLK Outdoor fan motor Measure the resistance between lead wires using a tester Temperature 14 104 F 10 40 C Color of lead wire Normal Ω HM09 12 U...

Page 45: ...onnector between the compressor and the power module disconnected activate the inverter and check if the in verter is normal by measuring the voltage balance between the terminals Output voltage is 50 130 V The voltage may differ according to the tester Operation method Start cooling or heating operation by pressing EMERGENCY OPERATION switch on the indoor unit TEST RUN OPERA TION Refer to 7 6 Mea...

Page 46: ... gas while heating Heating part Connect the compressor and activate the inverter Then measure the time until the inverter stops due to overcurrent Operation method Start heating or cooling operation by pressing EMERGENCY OPERATION switch on the indoor unit TEST RUN OPERATION Refer to 7 6 Measurement Measure the time from the start of compressor to the stop of compressor due to overcurrent Compress...

Page 47: ...coil to check if the coil is defective Refer to 10 4 Check if there is 208 230 V AC at L1 L2 In case CN721 is disconnected or R V coil is open voltage is generated between the terminal pins of the connector although no signal is being transmitted to R V coil Check if CN721 is connected Is there 208 230 V AC between CN721 and on the inverter P C board 3 minutes after the power supply is turned ON N...

Page 48: ...asure the voltage of CN931 Between 1 and 5 Between 2 and 5 Between 3 and 5 Does the voltage between each terminal become 5 and 0 V D C repeatedly Does the outdoor fan motor rotate smoothly Replace the outdoor fan motor Replace the inverter P C board Yes Yes No Fixed to either 5 or 0 V DC No No Yes Check the connection between the connector CN931 and CN932 Disconnect the connectors CN931 and CN932 ...

Page 49: ... 6 1 No Replace the inverter P C board Is there Bus bar voltage 2 between DB61 and DB61 on the inverter P C board Refer to 10 6 1 No Check the electric parts in main circuit Yes Yes No Disconnect the connector between the compressor and the power module 1 Turn ON power supply and press EMERGENCY OPERATION switch 260 370 V DC Inverter P C board Solder side DB61 260 325 V DC HM09 12NA 2 U8 1 Power m...

Page 50: ...ltage by an analog tester Properly fix the LEV coil to the expansion valve Replace the inverter P C board Replace the LEV coil Replace the expansion valve Is LEV coil properly fixed to the expansion valve Does the resistance of LEV coil have the characteristics Refer to 10 4 Do you hear the expansion valve click click Do you feel the expansion valve vibrate when touching it Turn ON the power suppl...

Page 51: ...oor fan motor If the connection is poor make it correct Operate the outdoor unit by starting EMERGENCY OPERATION Check the LED indication on the in verter P C board Does the LED blink 10 times Replace the inverter P C board Check the corresponding parts following LED indication Refer to 10 3 Yes No Yes 10 time blink No L Check of inverter P C board OBH747F ...

Page 52: ... the inverter P C board repeat 3 6 second OFF and 0 8 sec ond ON quick blinking 3 Yes No Lighted or not lighted Replace the inverter P C board 2 2 Be careful of the residual voltage of smoothing capacitor Is there amplitude of 10 to 20 V DC between the indoor terminal block S2 and S3 Confirmation of serial signal Yes Check the wiring If there are any error of the indoor outdoor connecting wire suc...

Page 53: ...e wiring is correct before the opera tion starts Turn ON the power supply Does the LED on the inverter P C board repeat 3 6 second OFF and 0 8 sec ond ON quick blinking 3 Yes No Lighted or not lighted Replace the inverter P C board 2 2 Be careful of the residual voltage of smoothing capacitor Turn OFF the power supply Remove the bridge between outdoor terminal block S2 and S3 Yes 3 Be sure to chec...

Page 54: ...defrost heater Check the following points before checking electric continuity 1 Does the resistance of ambient temperature thermistor have the characteristics Refer to 10 6 1 2 Is the resistance of defrost heater normal Refer to 10 4 3 Does the heater protector remain conducted not open 4 Are both ambient temperature thermistor and circuit of defrost heater securely connected to connectors Is ther...

Page 55: ...ondition combination of specific conditions such as antennas or wiring Check the following before asking for service 1 Devices affected by the electromagnetic noise TV sets radios FM AM broadcast shortwave 2 Channel frequency broadcast station affected by the electromagnetic noise 3 Channel frequency broadcast station unaffected by the electromagnetic noise 4 Layout of indoor outdoor unit of the a...

Page 56: ...ing JK Fuse F801 T3 15AL250V Back side of unit Expansion valve coil LEV CN724 Output to drive outdoor fan motor CN932 LED 4 14 32 50 68 86 104 0 10 20 30 40 50 60 70 80 90 100 Temperature F Defrost thermistor RT61 Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT68 32 50 68 86 104 122 140 158 176 0 20 40 60 80 100 120 140 160 180 200 Temperature F Fin temperature...

Page 57: ...Z HM09NA2 U8 MUZ HM12NA2 U8 Back side of unit Fin temperature thermistor RT64 CN642 Ambient temperature thermistor RT65 CN643 Discharge temperature thermistor RT62 CN641 Defrost thermistor RT61 CN641 Expansion valve coil LEV CN724 Bus bar voltage DB61 260 325 V DC Front side of unit 208 230 V AC Smoothing capacitor C62 Output to drive compressor LDU LDV LDW Fuse F701 T3 15AL250V Smoothing capacito...

Page 58: ... HM15NA U2 MUZ HM15NAH U1 MUZ HM18NA U2 MUZ HM18NAH U1 Fuse F701 T3 15AL250V Fin temperature thermistor RT64 CN642 Ambient temperature thermistor RT65 CN643 Discharge temperature thermistor RT62 CN641 Defrost thermistor RT61 CN641 DB61 260 370 V DC Front side of unit 208 230 V AC Smoothing capacitor C62 Output to drive compressor LDU LDV LDW Smoothing capacitor C61 Fuse F901 T3 15AL250V Jumper wir...

Page 59: ...t exchanger temperature thermistor RT68 CN644 Jumper wire for pre heat control setting JK Heater connector CN722 Optional parts Fuse F801 T3 15AL250V Back side of unit Expansion valve LEV CN724 Output to drive outdoor fan motor CN932 LED 4 14 32 50 68 86 104 0 10 20 30 40 50 60 70 80 90 100 Temperature F Defrost thermistor RT61 Ambient temperature thermistor RT65 Outdoor heat exchanger temperature...

Page 60: ...SSEMBLY INSTRUCTIONS 11 1 Slide the sleeve and check if there is a locking lever or not 2 The terminal with this connector shown below has the locking mechanism Slide the sleeve Pull the terminal while pushing the locking lever Hold the sleeve and pull out the terminal slowly Connector Sleeve Locking lever Detaching method of the terminal with locking mechanism The terminal which has the locking m...

Page 61: ... support and the separator 5 Remove the fixing screws of the terminal block support and the back panel 6 Remove the inverter assembly 7 Remove the screw of the ground wire and screw of the ter minal block support 8 Remove the heat sink support from the P C board support 9 Remove the screw of the inverter P C board and remove the inverter P C board from the P C board support Photo 6 MUZ HM09 12 15 ...

Page 62: ... MUZ HM09 12 15 18NAH U1 Photo 9 Other models Photo 10 62 Discharge temperature thermistor Heat sink Screw of the ground wire Screw of the terminal block support Screw of the inverter P C board Heat sink support P C board support Terminal block support Heat sink Screw of the ground wire Screw of the Terminal block support Screw of the inverter P C board Heat sink support Terminal block support P C...

Page 63: ...Pull out the discharge temperature thermistor from its holder 4 Pull out the defrost thermistor from its holder 5 Pull out the outdoor heat exchanger temperature thermistor from its holder 6 Pull out the ambient temperature thermistor from its holder Photo 11 MUZ HM09 12NA U2 MUZ HM09 12NAH U1 Photo 12 MUZ HM15 18NA U1 U2 MUZ HM15 18NA2 U1 MUZ HM15 18NAH U1 Photo 13 Other models 63 Defrost thermis...

Page 64: ...the inverter assembly Refer to section 2 3 Remove the screws fixing the reactor 4 Remove the reactor 5 Remove the soundproof felt 6 Recover gas from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 PSIG 7 Detach the brazed part of the suction and the discharge pipe connected with compressor 8 Remove the nuts fixing the compressor 9 Remove the compressor 10 D...

Page 65: ...ove the conduit plate 9 Remove the top panel 10 Remove the valve cover 11 Disconnect the power supply and indoor outdoor connect ing wire 12 Remove the screws of the cabinet 13 Remove the cabinet 14 Remove the screws of the back panel 15 Remove the back panel Photo 3 Photo 4 Photo 1 Photo 2 65 Screws of the cabinet Screws of the top panel Screws of the top panel Screw of the back panel Screws of t...

Page 66: ...ack panel 6 Remove the inverter assembly 7 Remove the screw of the ground wire screw of the P C board cover and screws of the terminal block support 8 Remove the heat sink support from the P C board support 9 Remove the screw of the inverter P C board and the inverter P C board from the P C board support Photo 5 Photo 6 3 Removing R V coil 1 Remove the cabinet and panels Refer to section 1 2 Disco...

Page 67: ...r to section 1 2 Disconnect the following connectors Inverter P C board CN931 and CN932 Fan motor 3 Remove the propeller fan nut 4 Remove the propeller fan 5 Remove the screws fixing the fan motor 6 Remove the fan motor NOTE The propeller fan nut is a reverse thread 6 Removing the compressor and 4 way valve 1 Remove the top panel cabinet and service panel Refer to section 1 2 Remove the back panel...

Page 68: ...ed Jul 2017 No OBH747 REVISED EDITION D Issued Feb 2017 No OBH747 REVISED EDITION C Issued Mar 2016 No OBH747 REVISED EDITION B Issued Feb 2016 No OBH747 REVISED EDITION A Published Dec 2015 No OBH747 Made in Japan HEAD OFFICE TOKYO BUILDING 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Specifications are subject to change without notice ...

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