Revision G: • The descriptions of the expansion valve coil have been corrected. (10-4.) • Some descriptions have been modified. Please void OBH549 REVISED EDITION-F. OUTDOOR UNIT HFC utilized SERVICE MANUAL No.
Use the specified refrigerant only Never use any refrigerant other than that specified. Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of. Correct refrigerant is specified in the manuals and on the spec labels provided with our products. We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions. Revision A: • MUZ-GE24NA and MUY-GE24NA have been added.
1 TECHNICAL CHANGES MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE18NA MUZ-GE24NA MUY-GE09NA MUY-GE12NA MUY-GE15NA MUY-GE18NA MUY-GE24NA 1. New model MUZ-GE15NA MUZ-GE18NA MUZ-GE15NA MUZ-GE18NA - 1 1 1. Compressor has been changed. 2. Inverter P.C. board has been changed. MUY-GE15NA MUY-GE18NA MUY-GE15NA MUY-GE18NA - 1 1 1. Compressor has been changed. 2. Inverter P.C. board has been changed. MUZ-GE09NA MUZ-GE09NAH 1. Defrost heater has been added. 2. Reactor has been changed. 3. Inverter P.C.
2 PART NAMES AND FUNCTIONS MUZ-GE09NA MUZ-GE09NA2 MUZ-GE09NAH MUZ-GE09NAH2 MUY-GE09NA MUY-GE09NA2 MUZ-GE12NA MUZ-GE12NA2 MUZ-GE12NAH MUZ-GE12NAH2 MUY-GE12NA MUY-GE12NA2 MUZ-GE15NA MUZ-GE15NA2 MUZ-GE15NAH MUZ-GE15NAH2 MUY-GE15NA MUY-GE15NA2 Air inlet (back and side) Piping Drain hose Air outlet Drain outlet MUZ-GE18NA MUZ-GE18NAH MUY-GE18NA Air inlet (back and side) Piping Drain hose Air outlet Drain outlet OBH549G 4
MUZ-GE24NA MUY-GE24NA Air inlet (back and side) Piping Drain hose Air outlet Drain outlet OBH549G 5
3 SPECIFICATION Cooling 1 MUZ-GE09NA MUZ-GE09NA2 MUY-GE09NA MUZ-GE09NAH MUY-GE09NA2 MUZ-GE09NAH2 9,000 Btu/h ( 3,8009,000 ~ 12,200 ) ( 3,800 ~ 12,200 ) MUZ-GE12NA MUZ-GE12NA2 MUY-GE12NA MUZ-GE12NAH MUY-GE12NA2 MUZ-GE12NAH2 12,000 12,000 ( 3,800 ~ 13,600 ) ( 3,800 ~ 13,600 ) Heating 47 1 10,900 Btu/h ( 4,500 ~ 14,100 ) — 14,400 ( 5,500 ~ 18,100 ) — Capacity Heating 17 2 Btu/h 6,600 (8,700) — 8,800 (11,200) — Rated (Minimum~Maximum) Power consumption Cooling 1 Heating 47 1 W W 660 (205~1,
Outdoor unit model Capacity Rated (Minimum~Maximum) Capacity Rated (Maximum) Power consumption Rated (Minimum~Maximum) Power consumption Rated (Maximum) Cooling 1 Heating 47 1 MUZ-GE15NA MUZ-GE15NA- 1 MUZ-GE15NA2 MUZ-GE15NAH MUZ-GE15NAH2 14,000 Btu/h ( 3,100 ~ 18,200 ) 18,000 Btu/h ( 4,800 ~ 20,900 ) Heating 17 2 Btu/h Cooling 1 Heating 47 1 W W Heating 17 2 W EER 1 [SEER] 3 Cooling HSPF IV 4 Heating COP Heating 1 Power supply V , phase , Hz Max. fuse size (time delay) A Min.
Outdoor unit model Cooling 1 Btu/h MUZ-GE24NA 22,500 (8,200 ~ 31,400) Heating 47 1 Btu/h 27,600 (7,500 ~ 36,900) — Capacity Heating 17 2 Btu/h 16,000 (24,600) — Power consumption Cooling 1 Heating 47 1 W W Power consumption Heating 17 2 W Capacity Rated (Minimum~Maximum) Rated (Maximum) Rated (Minimum~Maximum) Rated (Maximum) 1,800 (570 ~ 3,580) 1,800 (570 ~ 3,580) 2,340 (520 ~ 3,650) — EER 1 [SEER] 3 Cooling HSPF IV 4 Heating COP Heating 1 Power supply V , phase , Hz Max.
Test condition 3, 4 ARI Mode Indoor air condition (°F) Dry bulb Wet bulb Test Outdoor air condition (°F) Dry bulb Wet bulb "A-2" Cooling Steady State at rated compressor Speed 80 67 95 (75) "B-2" Cooling Steady State at rated compressor Speed 80 67 82 (65) SEER "B-1" Cooling Steady State (Cooling) at minimum compressor Speed 80 67 82 (65) "F-1" Cooling Steady State at minimum compressor Speed 80 67 67 (53.
4 OUTLINES AND DIMENSIONS MUZ-GE12NA MUZ-GE12NA2 MUZ-GE12NAH MUZ-GE12NAH2 MUY-GE12NA MUY-GE12NA2 Drain hole ø1-5/8 (GE09/12/15NA/NA2) Drain hole ø1-5/16 (GE09/12/15NAH/NAH2) 1-3/4 15-3/4 REQUIRED SPACE *1 4 in. or more when front and sides of the unit are clear . or 13-9/16 11/16 Air out 12 ~ 12-3/4 Air in Air in Unit: inch MUZ-GE15NA MUZ-GE15NA2 MUZ-GE15NAH MUZ-GE15NAH2 MUY-GE15NA MUY-GE15NA2 4 in 4 in .
MUZ-GE18NA MUZ-GE18NAH MUY-GE18NA Unit: inch REQUIRED SPACE Air in 1-11/32 11-25/32 2-19/32 1-9/16 . or 4 in e mor 2 Drain 3 holes ø1-5/16 (GE18NA) Clear *1 *1 20 in. more when front and sides of the unit are clear 20-9/32 Drain hole ø1-5/16 (GE18NAH) 4 in 14-3/16 13 Air in Air out 19-11/16 33-1/16 . or mo re r n.
MUZ-GE24NA MUY-GE24NA Unit: inch *1 20 in. or more when front and sides of the unit are clear Clear *1 REQUIRED SPACE 16-7/16 Air in Drain hole 1-9/16 1-5/8 ore rm 4 in mo re 13 2 14-3/16 . or .o 4 in ore Air out 2-holes 13/32 13/16 6-7/8 2 19-11/16 33-1/16 0 in m . or *2 14 in.
5 WIRING DIAGRAM MUZ-GE09NA MUZ-GE12NA MUZ-GE09NA2 MUZ-GE12NA2 OBH549G 13
MUZ-GE09NAH MUZ-GE12NAH MUZ-GE09NAH2 MUZ-GE12NAH2 OBH549G 14
MUY-GE09NA MUY-GE12NA MUY-GE09NA2 MUY-GE12NA2 OBH549G 15
MUZ-GE15NA MUZ-GE15NA- 1 OBH549G 16
MUZ-GE15NA2 MUZ-GE15NAH OBH549G 17
MUZ-GE15NAH2 MUY-GE15NA OBH549G 18
MUY-GE15NA- 1 MUY-GE15NA2 OBH549G 19
MUZ-GE18NA MUZ-GE18NA- 1 OBH549G 20
MUZ-GE18NAH MUY-GE18NA OBH549G 21
MUY-GE18NA- 1 OBH549G 22
MUZ-GE24NA OBH549G 23
MUY-GE24NA OBH549G 24
6 REFRIGERANT SYSTEM DIAGRAM MUZ-GE09NA MUZ-GE09NA2 MUZ-GE09NAH MUZ-GE09NAH2 MUY-GE09NA MUY-GE09NA2 Unit: inch Refrigerant pipe ø3/8 (with heat insulator) 4-way valve Muffler Stop valve (with service port) Flared connection Outdoor heat exchanger Muffler Discharge temperature thermistor Service port RT62 Compressor Service port Outdoor heat exchanger temperature thermistor RT68 Ambient temperature thermistor RT65 Defrost thermistor RT61 (MUZ) Flared connection Refrigerant pipe ø1/4 (with heat i
Unit: inch MUZ-GE18NA MUZ-GE18NAH MUY-GE18NA Refrigerant pipe ø1/2 (with heat insulator) Muffler 4-way valve #100 Stop valve (with service port) Flared connection Service port Service port Discharge temperature thermistor RT62 Defrost thermistor RT61 Outdoor heat exchanger (MUZ) Ambient temperature thermistor RT65 Compressor Outdoor heat exchanger temperature thermistor RT68 Flared connection LEV Receiver Refrigerant pipe ø1/4 (with heat insulator) Stop valve (with strainar) Strainer #100 R.
MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Refrigerant piping: ft. Max. Length Max. Height difference A B Model MUZ-GE09/12/15NA/NA2 MUZ-GE09/12/15NAH/NAH2 MUY-GE09/12/15NA/NA2 65 Piping size O.D: in. Gas Liquid 3/8 (GE09/12) 1/2 (GE15) 40 1/4 MUZ-GE18NA MUZ-GE18NAH MUY-GE18NA MUZ-GE24NA MUY-GE24NA 100 50 1/2 100 50 5/8 3/8 Indoor unit Max. Height difference B Max. Length A Outdoor unit ADDITIONAL REFRIGERANT CHARGE (R410A: oz.) NOTE: Refrigerant piping exceeding 25 ft.
7 DATA 7-1.
3) HEATING CAPACITY (MUZ) Indoor air Model MUZ-GE09NA MUZ-GE09NA2 MUZ-GE09NAH MUZ-GE09NAH2 MUZ-GE12NA MUZ-GE12NA2 MUZ-GE12NAH MUZ-GE12NAH2 MUZ-GE15NA MUZ-GE15NA2 MUZ-GE15NAH MUZ-GE15NAH2 MUZ-GE18NA MUZ-GE18NAH MUZ-GE24NA IDB (˚F) 75 70 65 75 70 65 75 70 65 75 70 65 75 70 65 75 70 65 75 70 65 75 70 65 75 70 65 5 TC 4.8 5.2 5.5 4.8 5.2 5.5 6.3 6.8 7.2 6.3 6.8 7.2 7.9 8.6 9.0 7.9 8.6 9.0 9.1 9.8 10.3 9.1 9.8 10.3 12.1 13.1 13.8 TPC 0.45 0.43 0.41 0.58 0.56 0.54 0.69 0.66 0.63 0.82 0.79 0.76 0.63 0.60 0.
7-2. PERFORMANCE CURVE Cooling Capacity correction factors Indoor air Wet-bulb temperature difference (°F) Cooling capacity (at Rated frequency) 1.5 Indoor intake air WB temperature( F) 1.4 1.3 1.2 79 1.1 75 1.0 0.9 14 23 32 41 50 59 68 77 86 95 104 72 68 64 113 Outdoor intake air DB temperature(°F) SHF at rating condition = 0.76 Airflow = 307 CFM F) ture (° mpera 0.7 B te e air W 71 67 63 k or inta Indo 0.6 0.
Heating (MUZ) Heating capacity (at Rated frequency) 59 68 79 Capacity correction factor Indoor air Dry-bulb temperature difference (°F) 1.3 1.2 1.1 ure rat 1.0 0.9 air DB ) (F te r in oo 0.8 e tak e mp Ind 0.7 0.6 0.5 0.4 -4 5 14 23 32 41 50 Outdoor intake air WB temperature (°F) 59 MUZ-GE09NAH MUZ-GE09NAH2 Airflow = 413 CFM 1.2 Total power consumption (kW) Total power consumption (kW) MUZ-GE09NA MUZ-GE09NA2 1.0 75 70 65 0.8 0.6 0.4 0.
2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 MUZ-GE18NAH Airflow = 512 CFM take air Indoor in 0 75 70 65 Total power consumption (kW) Total power consumption (kW) MUZ-GE18NA F) rature (° DB tempe 10 20 30 40 50 60 Outdoor intake air WB temperature (°F) 70 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 Airflow = 512 CFM take air Indoor in 0 F) rature (° DB tempe 10 20 30 40 50 60 Outdoor intake air WB temperature (°F) 70 Total power consumption (kW) MUZ-GE24NA Airflow = 738 CFM 3.0 75 70 65 2.6 2.
MUZ-GE12NA MUZ-GE12NA2 MUZ-GE12NAH MUZ-GE12NAH2 MUY-GE12NA MUY-GE12NA2 (PSIG) 190 86 80 75 70 380 340 ture 300 or ndo DB a per ) (°F tem 150 75 80 80 °F) re ( atu per D oor 75 m B te 70 Ind 130 I 260 6870 86 170 Suction pressure Condensing pressure (PSIG) 420 85 95 90 110 6870 100 105(°F) Outdoor ambient temperature 75 80 85 90 95 100 105(°F) Outdoor ambient temperature MUZ-GE15NA MUZ-GE15NA2 MUZ-GE15NAH MUZ-GE15NAH2 MUY-GE15NA MUY-GE15NA2 (PSIG) 200 86 80 75 70
MUZ-GE24NA MUY-GE24NA (PSIG) 480 390 r oo DB ) °F e( ur rat e mp te Ind 360 86 170 Suction pressure Condensing pressure 450 420 (PSIG) 180 86 80 75 70 330 300 160 80 150 75 140 70 130 Indoor DB temperature (°F) 120 270 6870 75 80 85 95 90 110 6870 100 105(°F) 75 Outdoor ambient temperature 80 85 90 95 Outdoor ambient temperature Heating (MUZ) Data is based on the condition of outdoor humidity 75%. Air flow should be set to High speed.
MUZ-GE12NA MUZ-GE12NA2 MUZ-GE12NAH MUZ-GE12NAH2 (PSIG) (PSIG) 460 210 Suction pressure Condensing pressure ) °F e( r atu r 380 or o Ind 340 DB e mp 185 75 70 65 420 te 58Hz 300 260 75 70 65 160 ) (°F ture 135 m B te or D o Ind a per 110 58Hz 85 5 15 25 35 45 55 65 60 75(°F) 5 15 25 Outdoor ambient temperature 35 45 55 65 75(°F) Outdoor ambient temperature MUZ-GE15NA MUZ-GE15NA2 MUZ-GE15NAH MUZ-GE15NAH2 (PSIG) 440 75 70 65 368 or ndo re atu per m
MUZ-GE18NA MUZ-GE18NAH (PSIG) 500 (PSIG) 210 75 70 65 475 ) 425 °F e( tur ra 400 B D or e mp te o 375 Ind 185 Suction pressure Condensing pressure 450 75 70 65 ) 160 re u at r 135 B rD pe (°F m te oo d In 110 350 58Hz 300 5 15 25 35 45 55 65 58Hz 85 325 60 75(°F) 5 15 25 Outdoor ambient temperature 35 45 55 65 75(°F) Outdoor ambient temperature MUZ-GE24NA (PSIG) 450 (PSIG) 210 75 70 65 425 re atu r pe 375 B rD o do 170 ) tem In 350 190
7-4. STANDARD OPERATION DATA Unit MSZ-GE09NA MSY-GE09NA Cooling Model Item Total Capacity Heating MSZ-GE12NA MSY-GE12NA Cooling MSZ-GE09NA Btu/h 9,000 10,900 12,000 14,400 - 0.82 — 0.74 — Input kW 0.660 0.760 0.960 1.170 Rated frequency Hz 59.5 77.5 69.0 77.0 MSZ-GE09NA, MSY-GE09NA Power supply (V, Phase, Hz) kW 0.022 0.023 0.022 0.023 A 0.24/0.22 0.25/0.23 0.24/0.22 0.25/0.
Unit MSZ-GE15NA MSY-GE15NA Cooling Model Item Total Capacity Heating MSZ-GE18NA MSY-GE18NA Cooling MSZ-GE15NA Btu/h 14,000 18,000 17,200 21,600 - 0.80 — 0.71 — Input kW 1.080 1.600 1.640 1.900 Rated frequency Hz 55.5 74.0 83.0 84.0 MSZ-GE15NA, MSY-GE15NA Power supply (V, Phase, Hz) Electrical circuit Fan motor current kW 0.045 0.031 0.043 0.037 A 0.50/0.45 0.35/0.32 0.43/0.39 0.40/0.
Unit MSZ-GE24NA MSY-GE24NA Cooling Btu/h 22,500 27,600 SHF - 0.75 — Input kW 1.800 2.340 Rated frequency Hz 66.5 82.0 Model Item Total Capacity Indoor unit Electrical circuit Refrigerant circuit 208/230, 1, 60 Input Fan motor current kW 0.058 A 0.56/0.51 MUZ-GE24NA MUZ-GE24NA MUY-GE24NA 208/230, 1, 60 Outdoor unit Power supply (V, phase, Hz) Input kW 1.742 2.282 Comp. current A 7.01/6.34 9.59/8.67 Fan motor current A 1.61/1.05 1.13/1.
7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY MUZ-GE09NA2 MUZ-GE09NAH2 MUY-GE09NA2 Correction of Cooling capacity 0.5 50 100 2.0 Capacity correction factors Input correction factors Capacity correction factors 1.0 0 Correction of Cooling total input 2.0 1.5 1.5 1.0 0.5 150 (Hz) MUZ-GE09NA MUZ-GE09NAH 0 50 100 MUZ-GE09NA2 MUZ-GE09NAH2 Correction of Heating capacity 1.5 1.0 0.
MUZ-GE24NA MUY-GE24NA Capacity correction factors 1.5 Correction of Cooling capacity 2.5 Correction of Cooling total input MUZ-GE24NA 1.5 Correction of Heating capacity 2.0 1.0 2.0 Correction of Heating total input 1.5 1.0 1.5 1.0 1.0 0.5 0.5 0.5 0.
8 ACTUATOR CONTROL MUZ-GE09NA MUZ-GE09NA2 MUZ-GE09NAH MUZ-GE09NAH2 MUY-GE09NA MUY-GE09NA2 MUZ-GE12NA MUZ-GE12NA2 MUZ-GE12NAH MUZ-GE12NAH2 MUY-GE12NA MUY-GE12NA2 MUZ-GE15NA MUZ-GE18NA MUZ-GE24NA MUZ-GE15NA2 MUZ-GE15NAH MUZ-GE18NAH MUZ-GE15NAH2 MUY-GE15NA MUY-GE18NA MUY-GE24NA MUY-GE15NA2 8-1. OUTDOOR FAN MOTOR CONTROL The fan motor turns ON/OFF, interlocking with the compressor. [ON] The fan motor turns ON 5 seconds before the compressor starts up.
9 SERVICE FUNCTIONS MUZ-GE09NA MUZ-GE09NA2 MUZ-GE09NAH MUZ-GE09NAH2 MUY-GE09NA MUY-GE09NA2 MUZ-GE12NA MUZ-GE12NA2 MUZ-GE12NAH MUZ-GE12NAH2 MUY-GE12NA MUY-GE12NA2 MUZ-GE15NA MUZ-GE18NA MUZ-GE24NA MUZ-GE15NA2 MUZ-GE15NAH MUZ-GE18NAH MUZ-GE15NAH2 MUY-GE15NA MUY-GE18NA MUY-GE24NA MUY-GE15NA2 9-1. CHANGE IN DEFROST SETTING (MUZ) Changing defrost finish temperature To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board. (Refer to 10-6.1.
10 TROUBLESHOOTING MUZ-GE09NA MUZ-GE09NA2 MUZ-GE09NAH MUZ-GE09NAH2 MUY-GE09NA MUY-GE09NA2 MUZ-GE12NA MUZ-GE12NA2 MUZ-GE12NAH MUZ-GE12NAH2 MUY-GE12NA MUY-GE12NA2 MUZ-GE15NA MUZ-GE18NA MUZ-GE24NA MUZ-GE15NA2 MUZ-GE15NAH MUZ-GE18NAH MUZ-GE15NAH2 MUY-GE15NA MUY-GE18NA MUY-GE24NA MUY-GE15NA2 10-1. CAUTIONS ON TROUBLESHOOTING 1. Before troubleshooting, check the following 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for miswiring. 2.
10-2. FAILURE MODE RECALL FUNCTION Outline of the function This air conditioner can memorize the abnormal condition which has occurred once. Even though LED indication listed on the troubleshooting check table (10-3.) disappears, the memorized failure details can be recalled. 1.
2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal. Check if outdoor unit is abnormal according to the following procedures. Make sure that the remote controller is set to the failure mode recall function. With the remote controller headed towards the indoor unit, press TOO COOL or TOO WARM button to adjust the set temperature to 77°F (25°C).
3. Outdoor unit failure mode table OPERATION Abnormal point INDICATOR (Failure mode / protection) upper lamp (Indoor unit) OFF None (Normal) 2-time flash Outdoor power system 2.5 seconds OFF 3-time flash 2.5 seconds OFF — — Discharge temperature thermistor Defrost thermistor (MUZ) 1-time flash every 2.5 seconds Fin temperature thermistor 3-time flash 2.5 seconds OFF 4-time flash 2.5 seconds OFF 2-time flash 2.5 seconds OFF P.C.
3. Outdoor unit failure mode table OPERATION INDICATOR Abnormal point upper lamp (Failure mode / protection) (Indoor unit) 11-time flash DC voltage 2.5 seconds OFF Each phase current of compressor 12-time flash Overcurrent Compressor open2.5 seconds phase OFF 14-time flash Stop valve (Closed valve) 2.5 seconds OFF 4-way valve/ Pipe temperature LED indication (Outdoor P.C. board) 8-time flash 2.5 seconds OFF 9-time flash 2.5 seconds OFF 10-time flash 2.
10-3. TROUBLESHOOTING CHECK TABLE No. Symptom 1 Outdoor unit does not operate. 2 3 Abnormal point/ Condition Remedy Condition 1-time flash every Outdoor power sys- Overcurrent protection cut-out operates 3 consecutive times with- • Reconnect connector of compressor. 2.5 seconds tem in 1 minute after the compressor gets started, or failure of restart • Refer to 10-5. "How to check inverter/ of compressor has repeated 24 times. compressor". • Check stop valve.
10-3. TROUBLESHOOTING CHECK TABLE Abnormal point/ Condition Condition Low discharge tem- Temperature of discharge temperature thermistor has been Outdoor 7-time flash 19 unit oper- 2.5 seconds OFF perature protection 122°F (50°C) or less for 20 minutes. ates. No. Symptom 8-time flash PAM protection PAM: 2.5 seconds OFF Pulse Amplitude Modulation Zero cross detecting circuit 9-time flash Inverter check mode 2.
Part name Check method and criterion Figure Measure the resistance between lead wires using a tester. (Temperature: -4 ~ 104°F (-20 ~ 40°C)) Color of lead wire RED – BLK BLK – WHT WHT – RED 28 ~ 40 U WHT LEV RED BLU Normal (Ω) BRN ORN 37 ~ 54 Normal (Ω) WHT RED (+12V) 37 ~ 54 Measure the resistance using a tester.
10-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector between compressor and the intelligent power module (IPM)/power module (IPM) 1. See 10-5. Check the voltage between terminals. Are the voltages balanced? Yes No Replace the inverter P.C. board. See 10-5. Check the compressor. “Check of open phase”. “Check of compressor”.
D Check of compressor winding ● Disconnect the connector between the compressor and intelligent power module/power module 1, and measure the resistance between the compressor terminals. <> At 3 points BLK - WHT BLK - RED Measure the resistance between the lead wires at 3 points. WHT - RED 1 <> Intelligent power module: MUZ-GE09/12/15/18/24NA, MUY-GE09/12/15/18/24NA Refer to 10-4.
G Check of outdoor thermistors Disconnect the connector of thermistor in the inverter P.C. board (see below table), and measure the resistance of thermistor. Is the resistance of thermistor normal? (Refer to 10-6.1.) Yes No Replace the thermistor except RT64. When RT64 is abnormal, replace the inverter P.C. board. Reconnect the connector of thermistor. Turn ON the power supply and press EMERGENCY OPERATION switch.
Unit operates HEAT mode even if it is set to COOL mode. Disconnect connector between the compressor and intelligent power module/ power module 1. Turn ON the power supply and press EMERGENCY OPERATION switch once (COOL mode). Is there 230 VAC between CN721 (MUZGE09/12/15/18)/CN602 (MUZ-GE24) and on the inverter P.C. board 3 minutes after the power supply is turned ON? No Replace the inverter Yes P.C. board. Replace the 4-way valve.
J Check of power supply MUZ-GE09/12/15NA/NA2/NAH/NAH2 MUZ-GE18NA/NAH MUY-GE09/12/15NA/NA2 MUY-GE18NA 1 Intelligent power module: MUZ-GE09/12/15/18/24NA, MUY-GE09/12/15/18/24NA Power module: Other models Disconnect the connector (CN61) between compressor and intelligent power module/ power module 1. Turn ON power supply and press EMERGENCY OPERATION switch. Does The upper lamp of OPERATION INDICATOR lamp on the indoor unit light up? Yes Rectify indoor/outdoor connecting wire.
K Check of LEV (Expansion valve) MSZ-GE06/09/12/15/18NA MSY-GE09/12/15/18NA MSZ-GE24NA MSY-GE24NA Turn ON the power supply. While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button. First, release RESET button. Hold down the other two buttons for another 3 seconds. Make sure that the indicators on the LCD screen shown in the right figure are all displayed. Then release the buttons.
L Check of inverter P.C. board Check the outdoor fan motor. (Refer to 10-5. .) Is the fuse (F901) blown on the inverter P.C. board? Yes No Check the connection of the connectors (CN931 , CN932) of the outdoor fan motor. If the connection is poor, make it correct. Only for MUZ-GE24NA MUY-GE24NA Operate the outdoor unit by starting EMERGENCY OPERATION. Check the LED indication on the inverter P.C. board. Does the LED flash 10 times? Yes (10-time flash) No Check the remedy following LED indication.
M How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage in the power supply? Yes Check the power supply. No Turn ON the power supply. No Is there rated voltage between outdoor terminal block S1 and S2? Yes Check the wiring. Press EMERGENCY OPERATION switch once. Does the OPERATION INDICATOR lamp light up? Yes Is serial signal error indicated 6 minutes later? Yes A Turn OFF the power supply.
N Electromagnetic noise enters into TV sets or radios Is the unit grounded? Yes Is the distance between the antennas and the indoor unit within 9.91 ft., or is the distance between the antennas and the outdoor unit within 9.91 ft.? Ground the unit. No Yes Extend the distance between the antennas and the indoor unit, and/or the antennas and the outdoor unit. Yes Extend the distance between the TV sets and/or radios and the indoor unit, or the TV sets or radios and the outdoor unit.
10-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-GE09NA MUZ-GE09NA2 MUZ-GE09NAH MUZ-GE09NAH2 MUY-GE09NA MUY-GE09NA2 MUZ-GE12NA MUZ-GE12NA2 MUZ-GE12NAH MUZ-GE12NAH2 MUY-GE12NA MUY-GE12NA2 Back side of unit 208/230 VAC Bus-bar voltage DB61 260-325 VDC (+) (-) MUZ-GE15NA MUZ-GE15NA2 MUZ-GE15NAH MUZ-GE15NAH2 MUY-GE15NA MUY-GE15NA2 Smoothing capacitor (C63) Smoothing capacitor (C62) Smoothing capacitor (C61) Heater connector (CN722) MUZ-GE•NAH/NAH2 Fuse (F701) T3.15AL250V Fuse (F801) T3.
MUZ-GE18NA MUZ-GE18NAH MUY-GE18NA Back side of unit 208/230 VAC Bus-bar voltage Smoothing DB61 capacitor 260-325 VDC (C63) (+) (-) Smoothing capacitor (C62) Smoothing Fuse (F701) capacitor T3.15AL250V (C61) Fuse (F801) T3.15AL250V R.V.coil (CN721) 208/230 VAC (MUZ) Heater connector (CN722) MUZ-GE• NAH Fuse (F901) T3.
MUZ-GE24NA MUY-GE24NA Fuse (F62) T2.0AL250V Fuse (F601) R.V. coil (CN602) T3.
11 DISASSEMBLY INSTRUCTIONS <"Terminal with locking mechanism" Detaching points> The terminal which has the locking mechanism can be detached as shown below. There are two types (refer to (1) and (2)) of the terminal with locking mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching. (1) Slide the sleeve and check if there is a locking lever or not. (2) The terminal with this connector has the locking mechanism.
OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the lead wire to the reactor and the following connectors: CN641 (Defrost thermistor (MUZ) and discharge temperature thermistor) CN643 (Ambient temperature thermistor) CN644 (Outdoor heat exchanger temperature thermistor) CN721 (R.V. coil) (MUZ) CN724 (LEV) CN931, CN932 (Fan motor) (3) Remove the compressor connector (CN61).
OPERATING PROCEDURE PHOTOS 4. Removing the discharge temperature thermistor, defrost thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor Photo 7 (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the lead wire to the reactor and the following connectors:
11-2. MUZ-GE18NA MUZ-GE18NAH MUY-GE18NA NOTE: Turn OFF power supply before disassembly. OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) (2) (3) (4) (5) (6) (7) Remove the screws of the service panel. Remove the screws of the top panel. Remove the screw of the valve cover. Remove the service panel. Remove the top panel. Remove the valve cover. Disconnect the power supply and indoor/outdoor connecting wire. (8) Remove the screws of the cabinet. (9) Remove the cabinet.
OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 Screw of the heat sink (1) Remove the cabinet and panels. (Refer to 1.) support and the separator (2) Disconnect the lead wire to the reactor and the following connectors: Screws of
OPERATING PROCEDURE PHOTOS 4. Removing the discharge temperature thermistor, defrost thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the lead wire to the reactor and the following connectors:
11-3. MUZ-GE24NA MUY-GE24NA NOTE: Turn OFF power supply before disassembly. OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) (2) (3) (4) (5) (6) (7) (8) (9) Remove the screws of the service panel. Remove the screws of the top panel. Remove the screw of the valve cover. Remove the service panel. Remove the screws fixing the conduit cover. Remove the conduit cover. Remove the top panel. Remove the valve cover. Disconnect the power supply and indoor/outdoor connecting wire.
OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the lead wire to the reactor and the following connectors: CN602 (R.V. coil) (MUZ) CN671 (Defrost thermistor (MUZ), discharge temperature thermistor and outdoor heat exchanger temperature thermistor) CN672 (Ambient temperature thermistor) CN724 (LEV) CN931, CN932 (Fan motor) (3) Remove the compressor connector.
OPERATING PROCEDURE PHOTOS 4. Removing the discharge temperature thermistor, defrost thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the lead wire to the reactor and the following connectors:
OBH549G 73
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2009 MITSUBISHI ELECTRIC CORPORATION Distributed in Jan. 2015. No. OBH 549 REVISED EDITION-G Distributed in Dec. 2013. No. OBH 549 REVISED EDITION-F Distributed in Apr. 2012. No. OBH 549 REVISED EDITION-E Distributed in Apr. 2011. No. OBH 549 REVISED EDITION-D Distributed in Apr. 2011. No. OBH 549 REVISED EDITION-C Distributed in Dec. 2010. No. OBH 549 REVISED EDITION-B Distributed in Sep. 2010. No.
