Table of Contents
SPLIT-TYPE AIR CONDITIONERS
OUTDOOR UNIT
SERVICE MANUAL
Models
MUZ-GE09NA
MUZ-GE09NA2
MUZ-GE12NA
MUZ-GE12NA2
MUY-GE09NA
MUY-GE09NA2
MUY-GE12NA
MUY-GE12NA2
MUY-GE15NA2
MUZ-GE09NA/NA2
MUZ-GE12NA/NA2
MUZ-GE15NA, -
/NA2
1
MUY-GE09NA/NA2
MUY-GE12NA/NA2
MUY-GE15NA, -
/NA2
1
NOTE:
RoHS compliant products have mark on the spec name plate.
MUZ-GE09NAH
MUZ-GE09NAH2
MUZ-GE12NAH
MUZ-GE12NAH2
MUZ-GE15NAH
-
1
-
1
MUY-GE18NA,
-
1
MUZ-GE09NAH/NAH2
MUZ-GE12NAH/NAH2
MUZ-GE15NAH/NAH2
Revision F:
• MUZ-GE09/12/15NA2, MUZ-GE09/12/15NAH2
and MUY-GE09/12/15NA2 have been added.
Please void OBH549 REVISED EDITION-E.
HFC
utilized
R410A
-
1
Indoor unit service manual
MSZ-GE•NA MSY-GE•NA Series (OBH548)
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS ····················· 4
3. SPECIFICATION ················································ 6
4. OUTLINES AND DIMENSIONS ······················ 10
5. WIRING DIAGRAM ·········································· 13
6. REFRIGERANT SYSTEM DIAGRAM ············· 25
7. DATA ································································ 28
8. ACTUATOR CONTROL ··································· 42
9. SERVICE FUNCTIONS ··································· 43
10. TROUBLESHOOTING ····································· 44
11. DISASSEMBLY INSTRUCTIONS ···················· 64
PARTS CATALOG (OBB549)
No. OBH549
REVISED EDITION-F
TM
Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric MUZ-GE09NA
Summary of Contents for Mitsubishi Electric MUZ-GE09NA
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Page 1: Outdoor Unit
Revision F: • MUZ-GE09/12/15NA2, MUZ-GE09/12/15NAH2 and MUY-GE09/12/15NA2 have been added. SPLIT-TYPE AIR CONDITIONERS Please void OBH549 REVISED EDITION-E. OUTDOOR UNIT SERVICE MANUAL No. OBH549 utilized REVISED EDITION-F R410A Models MUZ-GE09NA MUZ-GE09NAH MUZ-GE09NA2 MUZ-GE09NAH2 MUZ-GE12NA MUZ-GE12NAH MUZ-GE12NA2 MUZ-GE12NAH2 MUZ-GE15NA, MUZ-GE15NAH MUZ-GE15NA2 MUZ-GE15NAH2... - Page 2 Use the specifi ed 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.
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Page 3: Technical Changes
TECHNICAL CHANGES MUZ-GE09NA MUY-GE09NA MUZ-GE12NA MUY-GE12NA MUZ-GE15NA MUY-GE15NA MUZ-GE18NA MUY-GE18NA MUZ-GE24NA MUY-GE24NA 1. New model MUZ-GE15NA MUZ-GE15NA - MUZ-GE18NA MUZ-GE18NA - 1. Compressor has been changed. 2. Inverter P.C. board has been changed. MUY-GE15NA MUY-GE15NA - MUY-GE18NA MUY-GE18NA - 1. Compressor has been changed. -
Page 4: Part Names And Functions
PART NAMES AND FUNCTIONS MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE09NA2 MUZ-GE12NA2 MUZ-GE15NA2 MUZ-GE09NAH MUZ-GE12NAH MUZ-GE15NAH MUZ-GE09NAH2 MUZ-GE12NAH2 MUZ-GE15NAH2 MUY-GE09NA MUY-GE12NA MUY-GE15NA MUY-GE09NA2 MUY-GE12NA2 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) - Page 5 MUZ-GE24NA MUY-GE24NA Air inlet (back and side) Piping Drain hose Air outlet Drain outlet OBH549F...
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Page 6: Specification
SPECIFICATION MUZ-GE09NA MUZ-GE12NA MUZ-GE09NA2 MUY-GE09NA MUZ-GE12NA2 MUY-GE12NA Outdoor unit model MUZ-GE09NAH MUY-GE09NA2 MUZ-GE12NAH MUY-GE12NA2 MUZ-GE09NAH2 MUZ-GE12NAH2 9,000 9,000 12,000 12,000 Cooling 1 Btu/h ( 3,800 ~ 12,200 ) ( 3,800 ~ 12,200 ) ( 3,800 ~ 13,600 ) ( 3,800 ~ 13,600 ) - Page 7 MUZ-GE15NA MUZ-GE15NA- MUY-GE15NA MUZ-GE18NA MUY-GE18NA Outdoor unit model MUZ-GE15NA2 MUY-GE15NA- MUZ-GE18NA- MUY-GE18NA- MUZ-GE15NAH MUY-GE15NA2 MUZ-GE18NAH MUZ-GE15NAH2 14,000 14,000 17,200 17,200 Cooling 1 Btu/h ( 3,100 ~ 18,200 ) ( 3,100 ~ 18,200 ) ( 3,700 ~ 18,700 ) ( 3,700 ~ 18,700 ) Capacity 18,000 21,600...
- Page 8 Outdoor unit model MUZ-GE24NA MUY-GE24NA 22,500 22,500 Cooling 1 Btu/h (8,200 ~ 31,400) (8,200 ~ 31,400) Capacity Rated (Minimum~Maximum) 27,600 Heating 47 1 Btu/h — (7,500 ~ 36,900) Capacity Heating 17 2 Btu/h 16,000 (24,600) — Rated (Maximum) Cooling 1 1,800 (570 ~ 3,580) 1,800 (570 ~ 3,580) Power consumption Rated (Minimum~Maximum)
- Page 9 Test condition 3, 4 Indoor air condition (°F) Outdoor air condition (°F) Mode Test Dry bulb Wet bulb Dry bulb Wet bulb "A-2" Cooling Steady State (75) at rated compressor Speed "B-2" Cooling Steady State (65) at rated compressor Speed SEER "B-1"...
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Page 10: Outlines And Dimensions
OUTLINES AND DIMENSIONS Unit: inch MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE09NA2 MUZ-GE12NA2 MUZ-GE15NA2 MUZ-GE09NAH MUZ-GE12NAH MUZ-GE15NAH MUZ-GE09NAH2 MUZ-GE12NAH2 MUZ-GE15NAH2 MUY-GE09NA MUY-GE12NA MUY-GE15NA MUY-GE09NA2 MUY-GE12NA2 MUY-GE15NA2 REQUIRED SPACE Drain hole ø1-5/8 (GE09/12/15NA/NA2) 15-3/4 Drain hole ø1-5/16 (GE09/12/15NAH/NAH2) *1 4 in. or more when front... - Page 11 MUZ-GE18NA Unit: inch MUZ-GE18NAH MUY-GE18NA REQUIRED SPACE *1 20 in. more when front and sides of the unit are clear 20-9/32 11-25/32 1-9/16 Drain 3 holes Air in ø1-5/16 2-19/32 (GE18NA) Air in Drain hole ø1-5/16 (GE18NAH) 4-3/8 × 13/16 slot Air out 19-11/16 *2 When any 2 sides of left, right...
- Page 12 MUZ-GE24NA Unit: inch MUY-GE24NA REQUIRED SPACE *1 20 in. or more when front and sides of the unit are clear 16-7/16 Air in 1-9/16 Air out 2-holes 13/32 13/16 6-7/8 19-11/16 *2 When any 2 sides of left, right and rear of the unit are clear 3-3/16 33-1/16 4-5/16...
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Page 13: Wiring Diagram
WIRING DIAGRAM MUZ-GE09NA MUZ-GE12NA MUZ-GE09NA2 MUZ-GE12NA2 OBH549F... - Page 14 MUZ-GE09NAH MUZ-GE12NAH MUZ-GE09NAH2 MUZ-GE12NAH2 OBH549F...
- Page 15 MUY-GE09NA MUY-GE12NA MUY-GE09NA2 MUY-GE12NA2 OBH549F...
- Page 16 MUZ-GE15NA MUZ-GE15NA- OBH549F...
- Page 17 MUZ-GE15NA2 MUZ-GE15NAH OBH549F...
- Page 18 MUZ-GE15NAH2 MUY-GE15NA OBH549F...
- Page 19 MUY-GE15NA- MUY-GE15NA2 OBH549F...
- Page 20 MUZ-GE18NA MUZ-GE18NA- OBH549F...
- Page 21 MUZ-GE18NAH MUY-GE18NA OBH549F...
- Page 22 MUY-GE18NA- OBH549F...
- Page 23 MUZ-GE24NA OBH549F...
- Page 24 MUY-GE24NA OBH549F...
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Page 25: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MUZ-GE09NA MUZ-GE09NA2 Unit: inch MUZ-GE09NAH MUZ-GE09NAH2 MUY-GE09NA MUY-GE09NA2 Refrigerant pipe ø3/8 4-way valve (with heat insulator) Muffler Outdoor heat exchanger Stop valve temperature (with service port) thermistor Outdoor Muffler RT68 Discharge heat Flared connection temperature exchanger thermistor... - Page 26 Unit: inch MUZ-GE18NA MUZ-GE18NAH MUY-GE18NA Muffler Refrigerant pipe ø 1/2 #100 4-way valve (with heat insulator) Stop valve Service port (with service port) Outdoor Flared connection Discharge heat Ambient Defrost temperature exchanger temperature thermistor thermistor thermistor RT61 RT62 RT65 Service port (MUZ) Compressor Outdoor heat...
- Page 27 Outdoor unit ADDITIONAL REFRIGERANT CHARGE (R410A: oz.) NOTE: Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation. Refrigerant piping length (one way): ft. Outdoor unit Model precharged MUZ-GE09NA/NA2 1 lb. 12 oz. MUZ-GE09NAH/NAH2 MUY-GE09NA/NA2 MUZ-GE12NA/NA2 1.62 4.86 8.10...
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Page 28: Data.
DATA 7-1. PERFORMANCE DATA 1) COOLING CAPACITY MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE18NA MUZ-GE24NA MUZ-GE09NA2 MUZ-GE12NA2 MUZ-GE15NA2 MUZ-GE09NAH MUZ-GE12NAH MUZ-GE15NAH MUZ-GE18NAH MUZ-GE09NAH2 MUZ-GE12NAH2 MUZ-GE15NAH2 MUY-GE09NA MUY-GE12NA MUY-GE15NA MUY-GE18NA MUY-GE24NA MUY-GE09NA2 MUY-GE12NA2 MUY-GE15NA2 Indoor air Outdoor intake air DB temperature (˚F) Model IWB (˚F) - Page 29 Indoor air Outdoor intake air WB temperature (˚F) Model IDB (˚F) 0.45 0.57 0.67 0.74 10.6 0.78 11.0 0.79 12.4 0.82 MUZ-GE09NA 0.43 0.55 0.65 0.72 10.9 0.76 11.2 0.78 12.7 0.81 MUZ-GE09NA2 0.41 0.52 0.63 10.0 0.70 11.2 0.74 11.6 0.75 13.0 0.79 0.58...
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Page 30: Cooling Capacity
7-2. PERFORMANCE CURVE Cooling Cooling capacity (at Rated frequency) Indoor intake air WB temperature( F) Outdoor intake air DB temperature(°F) MUZ-GE09NA MUZ-GE09NA2 MUZ-GE12NA MUZ-GE12NA2 MUZ-GE09NAH MUZ-GE09NAH2 MUZ-GE12NAH MUZ-GE12NAH2 MUY-GE09NA MUY-GE09NA2 MUY-GE12NA MUY-GE12NA2 SHF at rating condition = 0.76 SHF at rating condition = 0.73... - Page 31 Heating (MUZ) Heating capacity (at Rated frequency) Outdoor intake air WB temperature (°F) MUZ-GE09NA MUZ-GE09NA2 MUZ-GE09NAH MUZ-GE09NAH2 Airflow = 413 CFM Airflow = 413 CFM Outdoor intake air WB temperature (°F) Outdoor intake air WB temperature (°F) MUZ-GE12NA MUZ-GE12NA2 MUZ-GE12NAH MUZ-GE12NAH2...
- Page 32 This value of frequency is not the same as the actual frequency in operating. Refer to 7-5 and 7-6 for the relationships between frequency and capacity. 7-3. CONDENSING PRESSURE Cooling Data is based on the condition of indoor humidity 50 %. Air flow should be set to High speed. MUZ-GE09NA MUZ-GE09NA2 MUZ-GE09NAH MUZ-GE09NAH2 MUY-GE09NA MUY-GE09NA2...
- Page 33 MUZ-GE12NA MUZ-GE12NA2 MUZ-GE12NAH MUZ-GE12NAH2 MUY-GE12NA MUY-GE12NA2 (PSIG) (PSIG) 6870 100 105 (°F) 6870 100 105 (°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-GE15NA MUZ-GE15NA2 MUZ-GE15NAH MUZ-GE15NAH2 MUY-GE15NA MUY-GE15NA2 (PSIG) (PSIG) 68 70 100 105(°F) 6870 100 105 (°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-GE18NA MUZ-GE18NAH...
- Page 34 Outdoor ambient temperature Outdoor ambient temperature Heating (MUZ) Data is based on the condition of outdoor humidity 75%. Air flow should be set to High speed. Data is for heating operation without any frost. MUZ-GE09NA MUZ-GE09NA2 MUZ-GE09NAH MUZ-GE09NAH2 (PSIG) (PSIG)
- Page 35 MUZ-GE12NA MUZ-GE12NA2 MUZ-GE12NAH MUZ-GE12NAH2 (PSIG) (PSIG) 58Hz 58Hz 75 (°F) 75 (°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-GE15NA MUZ-GE15NA2 MUZ-GE15NAH MUZ-GE15NAH2 (PSIG) (PSIG) 54Hz 54Hz 75 (°F) 75 (°F) Outdoor ambient temperature Outdoor ambient temperature OBH549F...
- Page 36 MUZ-GE18NA MUZ-GE18NAH (PSIG) (PSIG) 58Hz 58Hz 75 (°F) 75 (°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-GE24NA (PSIG) (PSIG) 58Hz 58Hz 75 (°F) 75 (°F) Outdoor ambient temperature Outdoor ambient temperature OBH549F...
- Page 37 MSZ-GE09NA, MSY-GE09NA MSZ-GE12NA, MSY-GE12NA Power supply (V, Phase, Hz) 208/230, 1, 60 Input 0.022 0.023 0.022 0.023 Fan motor current 0.24/0.22 0.25/0.23 0.24/0.22 0.25/0.23 MUZ-GE09NA MUZ-GE12NA MUZ-GE09NA2 MUZ-GE09NA MUZ-GE12NA2 MUZ-GE12NA MUZ-GE09NAH MUZ-GE09NA2 MUZ-GE12NAH MUZ-GE12NA2 Outdoor unit MUZ-GE09NAH2 MUZ-GE09NAH MUZ-GE12NAH2 MUZ-GE12NAH...
- Page 38 MSZ-GE15NA MSZ-GE18NA Model MSZ-GE15NA MSZ-GE18NA MSY-GE15NA MSY-GE18NA Item Unit Cooling Heating Cooling Heating Capacity Btu/h 14,000 18,000 17,200 21,600 0.80 — 0.71 — Input 1.080 1.600 1.640 1.900 Rated frequency 55.5 74.0 83.0 84.0 Indoor unit MSZ-GE15NA, MSY-GE15NA MSZ-GE18NA, MSY-GE18NA Power supply (V, Phase, Hz) 208/230, 1, 60 Input...
- Page 39 MSZ-GE24NA Model MSZ-GE24NA MSY-GE24NA Item Unit Cooling Heating Capacity Btu/h 22,500 27,600 0.75 — Input 1.800 2.340 Rated frequency 66.5 82.0 Indoor unit MSZ-GE24NA, MSY-GE24NA Power supply (V, Phase, Hz) 208/230, 1, 60 Input 0.058 Fan motor current 0.56/0.51 MUZ-GE24NA Outdoor unit MUZ-GE24NA MUY-GE24NA...
- Page 40 7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY MUZ-GE09NA MUZ-GE09NA2 MUZ-GE09NAH MUZ-GE09NAH2 MUZ-GE09NA MUZ-GE09NA2 MUY-GE09NA MUY-GE09NA2 MUZ-GE09NAH MUZ-GE09NAH2 Correction of Cooling capacity Correction of Cooling total input Correction of Heating total input Correction of Heating capacity (Hz) (Hz) (Hz)
- Page 41 MUZ-GE24NA MUY-GE24NA MUZ-GE24NA Correction of Cooling capacity Correction of Cooling total input Correction of Heating total input Correction of Heating capacity 150(Hz) 150(Hz) 150(Hz) 150(Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor 7-6.
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Page 42: Actuator Control
ACTUATOR CONTROL MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE18NA MUZ-GE24NA MUZ-GE09NA2 MUZ-GE12NA2 MUZ-GE15NA2 MUZ-GE09NAH MUZ-GE12NAH MUZ-GE15NAH MUZ-GE18NAH MUZ-GE09NAH2 MUZ-GE12NAH2 MUZ-GE15NAH2 MUY-GE09NA MUY-GE12NA MUY-GE15NA MUY-GE18NA MUY-GE24NA MUY-GE09NA2 MUY-GE12NA2 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. -
Page 43: Service Functions
SERVICE FUNCTIONS MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE18NA MUZ-GE24NA MUZ-GE09NA2 MUZ-GE12NA2 MUZ-GE15NA2 MUZ-GE09NAH MUZ-GE12NAH MUZ-GE15NAH MUZ-GE18NAH MUZ-GE09NAH2 MUZ-GE12NAH2 MUZ-GE15NAH2 MUY-GE09NA MUY-GE12NA MUY-GE15NA MUY-GE18NA MUY-GE24NA MUY-GE09NA2 MUY-GE12NA2 MUY-GE15NA2 9-1. CHANGE IN DEFROST SETTING (MUZ) Changing defrost finish temperatureTo change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board. (Refer to 10-6.1.) Defrost fi... -
Page 44: Troubleshooting
TROUBLESHOOTING MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE18NA MUZ-GE24NA MUZ-GE09NA2 MUZ-GE12NA2 MUZ-GE15NA2 MUZ-GE09NAH MUZ-GE12NAH MUZ-GE15NAH MUZ-GE18NAH MUZ-GE09NAH2 MUZ-GE12NAH2 MUZ-GE15NAH2 MUY-GE09NA MUY-GE12NA MUY-GE15NA MUY-GE18NA MUY-GE24NA MUY-GE09NA2 MUY-GE12NA2 MUY-GE15NA2 10-1. CAUTIONS ON TROUBLESHOOTING 1. Before troubleshooting, check the following 1) Check the power supply voltage. - Page 45 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. MSZ-GE24NA MSZ-GE06/09/12/15/18NA 1.
- Page 46 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 func- tion.
- Page 47 3. Outdoor unit failure mode table OPERATION Indoor/ Outdoor unit INDICATOR Abnormal point LED indication outdoor unit Condition Remedy failure mode upper lamp (Failure mode / protection) (Outdoor P.C. board) failure mode recall function (Indoor unit) recall function None (Normal) —...
- Page 48 3. Outdoor unit failure mode table OPERATION Indoor/ Outdoor unit INDICATOR Abnormal point LED indication outdoor unit Condition Remedy failure mode upper lamp (Failure mode / protection) (Outdoor P.C. board) failure mode recall function (Indoor unit) recall function 11-time fl ash DC voltage 8-time fl...
- Page 49 10-3. TROUBLESHOOTING CHECK TABLE Abnormal point/ No. Symptom LED indication Condition Remedy Condition Outdoor 1-time fl ash every Outdoor power sys- Overcurrent protection cut-out operates 3 consecutive times with- • Reconnect connector of compressor. unit does 2.5 seconds in 1 minute after the compressor gets started, or failure of restart •...
- Page 50 10-3. TROUBLESHOOTING CHECK TABLE Abnormal point/ No. Symptom LED indication Condition Remedy Condition Outdoor 7-time fl ash Low discharge tem- Temperature of discharge temperature thermistor has been • Refer to 10-5. "Check of LEV". unit oper- 2.5 seconds OFF perature protection 122°F (50°C) or less for 20 minutes.
- Page 51 10-4. TROUBLE CRITERION OF MAIN PARTS MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE18NA MUZ-GE24NA MUZ-GE09NA2 MUZ-GE12NA2 MUZ-GE15NA2 MUZ-GE09NAH MUZ-GE12NAH MUZ-GE15NAH MUZ-GE18NAH MUZ-GE09NAH2 MUZ-GE12NAH2 MUZ-GE15NAH2 MUY-GE09NA MUY-GE12NA MUY-GE15NA MUY-GE18NA MUY-GE24NA MUY-GE09NA2 MUY-GE12NA2 MUY-GE15NA2 Part name Check method and criterion Figure Defrost thermistor (RT61) (MUZ)
- Page 52 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 of open phase”. Check the voltage between terminals. Replace the inverter P.C. board. Are the voltages balanced? Check the compressor.
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Page 53
D Check of compressor winding ● Disconnect the connector between the compressor and intelligent power module/power module 1, and measure the resis- tance between the compressor terminals. <
> At 3 points BLK - WHT BLK - RED Measure the resistance between the lead wires at 3 points. WHT - RED < >... - Page 54 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. Replace the thermistor except RT64. When RT64 is Is the resistance of thermistor normal? (Refer to 10-6.1.) abnormal, replace the inverter P.C.
- Page 55 Unit operates HEAT mode even if it is set to COOL mode. Disconnect connector between the compressor and intelligent power Is there 230 VAC between CN721 (MUZ- module/ power module 1. GE09/12/15/18)/CN602 (MUZ-GE24) Replace the inverter Turn ON the power supply and press on the inverter P.C.
- Page 56 J Check of power supply MUZ-GE09/12/15NA/NA2/NAH/NAH2 MUZ-GE18NA/NAH MUY-GE09/12/15NA/NA2 MUY-GE18NA 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. Rectify indoor/outdoor Turn ON power supply and press connecting wire. EMERGENCY OPERATION switch.
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Page 57
K Check of LEV (Expansion valve) MSZ-GE24NA MSZ-GE06/09/12/15/18NA MSY-GE24NA MSY-GE09/12/15/18NA 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. - Page 58 L Check of inverter P.C. board Check the outdoor fan motor. (Refer to 10-5. .) Is the fuse (F901) blown on the in- verter P.C. board? Check the connection of the connectors (CN931 , CN932) of the outdoor fan motor. If the connection is poor, make it correct.
- Page 59 M How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage in the power supply? Check the power supply. Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and S2? Check the wiring.
- Page 60 N Electromagnetic noise enters into TV sets or radios Is the unit grounded? Ground the unit. Is the distance between the antennas Extend the distance between the antennas and and the indoor unit within 9.91 ft., or is the indoor unit, and/or the antennas and the the distance between the antennas and outdoor unit.
- Page 61 10-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE09NA2 MUZ-GE12NA2 MUZ-GE15NA2 MUZ-GE09NAH MUZ-GE12NAH MUZ-GE15NAH MUZ-GE09NAH2 MUZ-GE12NAH2 MUZ-GE15NAH2 MUY-GE09NA MUY-GE12NA MUY-GE15NA MUY-GE09NA2 MUY-GE12NA2 MUY-GE15NA2 Bus-bar voltage Smoothing Smoothing Smoothing Heater connector Back side of unit DB61...
- Page 62 MUZ-GE18NA MUZ-GE18NAH MUY-GE18NA R.V.coil Bus-bar voltage Smoothing Smoothing Smoothing Fuse (F701) (CN721) Back side of unit DB61 capacitor capacitor capacitor T3.15AL250V 208/230 260-325 VDC (C63) (C62) (C61) Fuse (F801) 208/230 VAC (MUZ) T3.15AL250V Heater con- nector (CN722) MUZ-GE• Fuse (F901) T3.15AL250V Output to drive...
- Page 63 Fuse (F62) Fuse (F601) R.V. coil (CN602) MUZ-GE24NA T2.0AL250V T3.15AL250V (MUZ) 208/230 VAC (MUZ) MUY-GE24NA Jumper wire for changing defrost setting (JS) (MUZ) Jumper wire for pre-heat control setting (JK) Signal of out- Defrost thermistor door fan motor /RT61 (CN671) (MUZ) (CN931) Discharge temperature thermistor/RT62...
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Page 64: Disassembly Instructions
Sleeve Slide the sleeve. Hold the sleeve, and Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector 11-1. MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE09NA2 MUZ-GE12NA2 MUZ-GE15NA2 MUZ-GE09NAH MUZ-GE12NAH MUZ-GE15NAH MUZ-GE09NAH2 MUZ-GE12NAH2 MUZ-GE15NAH2 MUY-GE09NA... - Page 65 OPERATING PROCEDURE PHOTOS Screws of the 2. Removing the inverter assembly, inverter P.C. board Photo 4 terminal block (1) Remove the cabinet and panels. (Refer to 1.) support and the (2) Disconnect the lead wire to the reactor and the following Screw of the heat sink back panel connectors:...
- Page 66 OPERATING PROCEDURE PHOTOS Photo 7 4. Removing the discharge temperature thermistor, defrost thermistor, outdoor heat exchanger tempera- ture thermistor and ambient temperature thermistor (1) Remove the cabinet and panels. (Refer to 1.) Outdoor heat (2) Disconnect the lead wire to the reactor and the following exchanger tempera- connectors: ture thermistor...
- Page 67 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) Remove the screws of the service panel. Screw of the top panel Screws of the cabinet (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover.
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Page 68
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 con- nectors: Screws of
- Page 69 OPERATING PROCEDURE PHOTOS 4. Removing the discharge temperature thermistor, Photo 6 defrost thermistor, outdoor heat exchanger tempera- Outdoor heat Ambient tem- exchanger tempera- perature ture thermistor and ambient temperature thermistor ture thermistor thermistor (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the lead wire to the reactor and the following connectors:
- Page 70 11-3. MUZ-GE24NA MUY-GE24NA NOTE: Turn OFF power supply before disassembly. OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove the screws of the service panel. Screws of the top panel (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover.
- Page 71 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 4 (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the lead wire to the reactor and the following con- Screw of the nectors: relay panel Screws of the
- Page 72 OPERATING PROCEDURE PHOTOS 4. Removing the discharge temperature thermistor, Photo 6 defrost thermistor, outdoor heat exchanger tempera- Outdoor heat Ambient tem- exchanger tempera- perature ture thermistor and ambient temperature thermistor ture thermistor thermistor (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the lead wire to the reactor and the following connectors:
- Page 73 OBH549F...
- Page 74 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2009 MITSUBISHI ELECTRIC CORPORATION 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.
- Page 69 OPERATING PROCEDURE PHOTOS 4. Removing the discharge temperature thermistor, Photo 6 defrost thermistor, outdoor heat exchanger tempera- Outdoor heat Ambient tem- exchanger tempera- perature ture thermistor and ambient temperature thermistor ture thermistor thermistor (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the lead wire to the reactor and the following connectors: