Table of Contents
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INDOOR UNIT
OUTDOOR UNIT
SERVICE MANUAL
Models
MUZ-HM09NA
MUZ-HM12NA
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
Revision C:
• MUZ-HM09/12NA -
HFC
utilized
R410A
,
MUZ-HM18NA
-
U1
U8
,
MUZ-HM18NA2
-
U1
U8
,
MUZ-HM24NA
-
U1
U8
,
MUZ-HM24NA2
-
U1
U8
-
U1
-
U1
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS ····················· 4
3. SPECIFICATION ················································ 5
4. OUTLINES AND DIMENSIONS ······················ 10
5. WIRING DIAGRAM ·········································· 12
6. REFRIGERANT SYSTEM DIAGRAM ············· 15
7. DATA ································································ 19
8. ACTUATOR CONTROL ··································· 32
9. SERVICE FUNCTIONS ··································· 33
10. TROUBLESHOOTING ····································· 34
11. DISASSEMBLY INSTRUCTIONS ···················· 59
PARTS CATALOG (OBB747)
,
MUZ-HM09/12NA2 -
U1
have been added.
OBH747 REVISED EDITION-B is void.
No. OBH747
REVISED EDITION-C
Indoor unit service manual
MSZ-HM•NA Series (OBH746)
U1
-
U1
-
U1
-
U1
-
U1
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Table of Contents
Related Manuals for Mitsubishi Electric MUZ-HM09NA-U1
Summary of Contents for Mitsubishi Electric MUZ-HM09NA-U1
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Page 1: Table Of Contents
Revision C: • MUZ-HM09/12NA - MUZ-HM09/12NA2 - have been added. OBH747 REVISED EDITION-B is void. INDOOR UNIT OUTDOOR UNIT No. OBH747 utilized REVISED EDITION-C SERVICE MANUAL R410A Models MUZ-HM09NA MUZ-HM18NA MUZ-HM09NA2 MUZ-HM18NA2 MUZ-HM12NA MUZ-HM24NA MUZ-HM12NA2 MUZ-HM24NA2 MUZ-HM15NA Indoor unit service manual MUZ-HM15NA2 MSZ-HM•NA Series (OBH746) CONTENTS... - 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: Muz-Hm09Na2
TECHNICAL CHANGES MUZ-HM24NA 1. New model MUZ-HM09NA MUZ-HM09NA2 MUZ-HM12NA MUZ-HM12NA2 MUZ-HM15NA MUZ-HM15NA2 MUZ-HM18NA MUZ-HM18NA2 MUZ-HM24NA2 1. New model MUZ-HM09NA MUZ-HM09NA2 MUZ-HM12NA MUZ-HM12NA2 1. New model OBH747C... -
Page 4: Part Names And Functions
PART NAMES AND FUNCTIONS MUZ-HM09NA MUZ-HM09NA2 MUZ-HM12NA MUZ-HM12NA2 MUZ-HM15NA MUZ-HM15NA2 MUZ-HM18NA MUZ-HM18NA2 Air inlet (back and side) Piping Air outlet Drain hose Drain outlet MUZ-HM24NA MUZ-HM24NA2 Air inlet (back and side) Piping Drain hose Air outlet Drain outlet OBH747C... -
Page 5: Specification
SPECIFICATION MUZ-HM09NA - MUZ-HM09NA - Outdoor unit model MUZ-HM09NA2 - MUZ-HM09NA2 - Cooling 1 Btu/h 9,000 ( 3,800 ~ 10,000 ) Capacity Rated (Minimum~Maximum) Heating 47 1 Btu/h 10,900 ( 4,500 ~ 11,800 ) Capacity Btu/h 6,700 (7,200) Heating 17 2 Rated (Maximum) 750 (240 - 850) 750 (205 - 850) - Page 6 MUZ-HM12NA - MUZ-HM12NA - Outdoor unit model MUZ-HM12NA2 - MUZ-HM12NA2 - Btu/h 12,000 ( 3,800 ~ 12,200 ) Cooling 1 Capacity Rated (Minimum~Maximum) Heating 47 1 Btu/h 12,200 ( 4,500 ~ 14,500 ) 12,200 ( 5,500 ~ 14,500 ) Capacity Heating 17 2 Btu/h 7,600 (9,000)
- Page 7 MUZ-HM15NA MUZ-HM18NA Outdoor unit model MUZ-HM15NA2 MUZ-HM18NA2 Cooling 1 Btu/h 14,000 (3,100 - 16,000) 17,200 (5,800 - 18,000) Capacity Rated (Minimum~Maximum) Heating 47 1 Btu/h 18,000 (4,800 - 18,500) 18,000 (5,400 - 20,900) Capacity Btu/h 11,500 (14,000) 11,500 (15,000) Heating 17 2 Rated (Maximum) 1,127 (187 - 1,957) 1,598 (308 - 2,028)
- Page 8 MUZ-HM24NA Outdoor unit model MUZ-HM24NA2 Cooling 1 Btu/h 22,500 (5,800 ~ 22,500) Capacity Rated (Minimum~Maximum) Heating 47 1 Btu/h 26,000 (5,400 ~ 26,000) Capacity Heating 17 2 Btu/h 18,500 (18,500) Rated (Maximum) Cooling 1 2,575 (275 ~ 2,575) Power consumption Rated (Minimum~Maximum) Heating 47 1 2,445 (265 ~ 2,445)
- 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-HM09NA MUZ-HM09NA2 MUZ-HM12NA MUZ-HM12NA2 MUZ-HM15NA MUZ-HM15NA2 MUZ-HM18NA MUZ-HM18NA2 REQUIRED SPACE 4 in. (100 mm) or more when front and sides of the unit are clear When any 2 sides of left, right and rear of the unit are clear holes Liquid refrigerant pipe joint Refrigerant pipe (flared) - Page 11 MUZ-HM24NA MUZ-HM24NA2 Unit: inch REQUIRED SPACE *1 20 in. (500 mm) or more when front and sides of the unit are clear 16-7/16 Air in 1-9/16 Air in 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 33-1/16 3-3/16...
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Page 12: Wiring Diagram
WIRING DIAGRAM MUZ-HM09NA MUZ-HM09NA2 MUZ-HM12NA MUZ-HM12NA2 MUZ-HM09NA MUZ-HM09NA2 MUZ-HM12NA MUZ-HM12NA2 OBH747C... - Page 13 MUZ-HM15NA MUZ-HM15NA2 MUZ-HM18NA MUZ-HM18NA2 OBH747C...
- Page 14 MUZ-HM24NA MUZ-HM24NA2 OBH747C...
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Page 15: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MUZ-HM09NA MUZ-HM09NA2 MUZ-HM12NA MUZ-HM12NA2 Unit: Inch (mm) Refrigerant pipe ø3/8 (ø9.52) 4-way valve (with heat insulator) Muffler Outdoor heat exchanger Stop valve temperature (with service port) thermistor Outdoor Muffler Discharge RT68 heat Flared connection temperature exchanger thermistor Service port RT62 Ambient... - Page 16 MUZ-HM12NA MUZ-HM12NA2 Unit: Inch (mm) Refrigerant pipe ø3/8 (ø9.52) 4-way valve (with heat insulator) Muffler Outdoor heat exchanger Stop valve temperature (with service port) thermistor Outdoor Muffler Discharge RT68 heat Flared connection temperature exchanger thermistor Service port RT62 Ambient Compressor temperature Service port thermistor...
- Page 17 MUZ-HM24NA MUZ-HM24NA2 Unit: Inch (mm) Muffler 4-way with #100 mesh strainer Refrigerant pipe ø5/8 ( ø 15.88) valve (with heat insulator) Service port Stop valve (with service port) Outdoor Flared connection Discharge heat Defrost temperature exchanger Service thermistor thermistor port RT62 RT61 Compressor...
- Page 18 MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Refrigerant piping: ft. Piping size O.D: in. Model Max. Length Max. Height difference Liquid MUZ-HM09NA MUZ-HM09NA2 MUZ-HM12NA MUZ-HM12NA2 MUZ-HM15NA MUZ-HM15NA2 MUZ-HM18NA MUZ-HM18NA2 MUZ-HM24NA MUZ-HM24NA2 Indoor unit Max. Height difference Max. Length Outdoor unit ADDITIONAL REFRIGERANT CHARGE (R410A: oz.) NOTE: Refrigerant piping exceeding 25 ft.
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Page 19: Data
DATA MUZ-HM09NA MUZ-HM09NA2 MUZ-HM12NA MUZ-HM12NA2 MUZ-HM15NA MUZ-HM15NA2 MUZ-HM18NA MUZ-HM18NA2 MUZ-HM24NA MUZ-HM24NA2 7-1. PERFORMANCE DATA 1) COOLING CAPACITY Indoor air Outdoor intake air DB temperature (˚F) Model IWB (˚F) SHC TPC SHC TPC SHC TPC SHC TPC SHC TPC 11.0 0.67 10.3 0.73 0.79 0.83... - Page 20 3) HEATING CAPACITY Indoor air Outdoor intake air WB temperature (˚F) Model IDB (˚F) 0.53 0.67 0.79 0.88 10.6 0.92 11.0 0.94 12.4 0.97 MUZ-HM09NA 0.51 0.65 0.77 0.86 10.9 0.90 11.2 0.92 12.7 0.95 MUZ-HM09NA2 0.49 0.62 0.74 10.0 0.83 11.2 0.88...
- Page 21 7-2. PERFORMANCE CURVE Cooling Cooling capacity (at Rated frequency) Indoor intake air Wet-bulb temperature( F) Outdoor intake air DB temperature(°F) MUZ-HM09NA MUZ-HM09NA2 MUZ-HM12NA MUZ-HM12NA2 SHF at rating condition = 0.82 SHF at rating condition = 0.77 Airflow = 399 CFM Airflow = 399 CFM Outdoor intake air DB temperature (°F)
- Page 22 Heating Heating capacity (at Rated frequency) Outdoor intake air WB temperature (°F) MUZ-HM09NA MUZ-HM09NA2 MUZ-HM12NA MUZ-HM12NA2 Airflow = 406 CFM Airflow = 406 CFM Outdoor intake air WB temperature (°F) Outdoor intake air WB temperature (°F) MUZ-HM15NA MUZ-HM15NA2 MUZ-HM18NA MUZ-HM18NA2 Airflow = 463 CFM Airflow...
- Page 23 7-3. CONDENSING PRESSURE Cooling Data are based on the condition of indoor humidity 50 %. Air flow should be set to High speed. MUZ-HM09NA MUZ-HM09NA2 (PSIG) (PSIG) 68 70 100 105 (°F) 68 70 100 105 (°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-HM12NA - MUZ-HM12NA2 -...
- Page 24 MUZ-HM15NA MUZ-HM15NA2 (PSIG) (PSIG) (°F) (°F) 100 105 Outdoor ambient temperature Outdoor ambient temperature MUZ-HM18NA MUZ-HM18NA2 (PSIG) (PSIG) (°F) (°F) 100 105 Outdoor ambient temperature Outdoor ambient temperature MUZ-HM24NA MUZ-HM24NA2 (PSIG) (PSIG) (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature Heating Data are based on the condition of outdoor humidity 75%.
- Page 25 MUZ-HM09NA MUZ-HM09NA2 MUZ-HM12NA - MUZ-HM12NA2 - (PSIG) (PSIG) 58Hz 58Hz 75 (°F) 75 (°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-HM12NA - MUZ-HM12NA2 - (PSIG) (PSIG) 58Hz 58Hz 75 (°F) 75 (°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-HM15NA MUZ-HM15NA2 (PSIG) (PSIG) 58Hz...
- Page 26 MUZ-HM18NA MUZ-HM18NA2 (PSIG) (PSIG) 58Hz 58Hz (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-HM24NA MUZ-HM24NA2 (PSIG) (PSIG) 81Hz 81Hz (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature OBH747C...
- Page 27 7-4. STANDARD OPERATION DATA Model MSZ-HM09NA MSZ-HM09NA Item Unit Cooling Heating Cooling Heating Capacity Btu/h 9,000 10,900 9,000 10,900 — 0.82 — 0.82 — Input 0.750 0.900 0.750 0.900 Rated frequency 59.5 79.0 59.5 77.5 Indoor unit MSZ-HM09NA MSZ-HM09NA Power supply phase, 208/230, 1, 60 Input...
- Page 28 7-4. STANDARD OPERATION DATA Model MSZ-HM12NA MSZ-HM12NA Item Unit Cooling Heating Cooling Heating Capacity Btu/h 12,000 12,200 12,000 14,400 — 0.77 — 0.77 — Input 1.210 0.990 1.210 0.990 Rated frequency 89.0 90.0 69.0 77.0 Indoor unit MSZ-HM12NA MSZ-HM12NA Power supply phase, 208/230, 1, 60 Input...
- Page 29 7-4. STANDARD OPERATION DATA Model MSZ-HM15NA MSZ-HM18NA MSZ-HM24NA Item Unit Cooling Heating Cooling Heating Cooling Heating Capacity Btu/h 14,000 18,000 17,200 18,000 22,500 26,000 — 0.78 — 0.86 — 0.89 — Input 1.17 1.60 1.64 1.59 2.63 Rated frequency 56.5 Indoor unit MSZ-HM15NA MSZ-HM18NA...
- Page 30 7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY MUZ-HM09NA - MUZ-HM09NA2 - Correction of Cooling capacity Correction of Cooling total input Correction of Heating total input Correction of Heating capacity The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor MUZ-HM09NA -...
- Page 31 MUZ-HM15NA MUZ-HM15NA2 Correction of Cooling capacity Correction of Cooling total input Correction of Heating capacity Correction of Heating total input (Hz) (Hz) (Hz) (Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor MUZ-HM18NA MUZ-HM18NA2 Correction of Cooling capacity Correction of Cooling total input...
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Page 32: Actuator Control
ACTUATOR CONTROL MUZ-HM09NA MUZ-HM09NA2 MUZ-HM12NA MUZ-HM12NA2 MUZ-HM15NA MUZ-HM15NA2 MUZ-HM18NA MUZ-HM18NA2 MUZ-HM24NA MUZ-HM24NA2 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. [OFF] The fan motor turns OFF 15 seconds after the compressor has stopped running. 5 seconds 15 seconds Compressor... -
Page 33: Service Functions
SERVICE FUNCTIONS MUZ-HM09NA MUZ-HM09NA2 MUZ-HM12NA MUZ-HM12NA2 MUZ-HM15NA MUZ-HM15NA2 MUZ-HM18NA MUZ-HM18NA2 MUZ-HM24NA MUZ-HM24NA2 9-1. CHANGE IN DEFROST SETTING Changing defrost finish temperature <JS> To 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 34: Troubleshooting
TROUBLESHOOTING MUZ-HM09NA MUZ-HM09NA2 MUZ-HM12NA MUZ-HM12NA2 MUZ-HM15NA MUZ-HM15NA2 MUZ-HM18NA MUZ-HM18NA2 MUZ-HM24NA MUZ-HM24NA2 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. Take care of the following during servicing 1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, then after con- firming the horizontal vane is closed, turn off the breaker and/or disconnect the power plug. - Page 35 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.
- Page 36 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. 1.
- Page 37 3. Table of outdoor unit failure mode recall function NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-3.). MUZ-HM09NA MUZ-HM09NA2 MUZ-HM12NA MUZ-HM12NA2 OPERATION Indoor/ Outdoor unit INDICATOR Abnormal point LED indication outdoor unit Condition Remedy failure mode upper lamp...
- Page 38 NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-3.). 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...
- Page 39 MUZ-HM15NA MUZ-HM15NA2 MUZ-HM18NA MUZ-HM18NA2 NOTE: Blinking patterns of this mode differ from the ones of MUZ-HM24NA MUZ-HM24NA2 TROUBLESHOOTING CHECK TABLE (10-3.). The upper lamp of the Indoor/outdoor Outdoor unit OPERATION Abnormal point LED indication unit failure Condition Remedy failure mode INDICATOR (Failure mode/protection) (Outdoor P.C.
- Page 40 NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-3.). The upper lamp of the Indoor/outdoor Outdoor unit OPERATION Abnormal point LED indication unit failure Condition Remedy failure mode INDICATOR (Failure mode/protection) (Outdoor P.C. board) mode recall recall function lamp...
- Page 41 10-3. TROUBLESHOOTING CHECK TABLE Abnormal point/ Symptom LED indication Condition Remedy Condition Outdoor unit 1-time fl ash every Outdoor power sys- Overcurrent protection cut-out operates 3 consecutive times • Reconnect connector of compres- does not op- 2.5 seconds within 1 minute after the compressor gets started. sor.
- Page 42 Abnormal point/ Symptom LED indication Condition Remedy Condition Outdoor unit 1-time fl ash Frequency drop by MUZ-HM Current from power outlet is nearing Max. fuse The unit is normal, but check the operates. 2.5 seconds OFF current protection 09/12NA(2) size. following.
- Page 43 10-4. TROUBLE CRITERION OF MAIN PARTS MUZ-HM09NA MUZ-HM09NA2 MUZ-HM12NA MUZ-HM12NA2 MUZ-HM15NA MUZ-HM15NA2 MUZ-HM18NA MUZ-HM18NA2 MUZ-HM24NA MUZ-HM24NA2 Part name Check method and criterion Figure Defrost thermistor (RT61) Fin temperature thermistor (RT64) Measure the resistance with a tester. Ambient temperature thermis- Refer to 10-6. “Test point diagram and voltage”, 1. “Inverter P.C. tor (RT65) board”, for the chart of thermistor.
- Page 44 10-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector between the compressor and the power module (IPM) (MUZ-HM09/12NA(2) )/(IC700) (MUZ-HM09/12NA(2) , MUZ-HM15/18/24NA(2)) Check the voltage between terminals. See 10-5. “Check of open phase”. Replace the inverter P.C. board. Are the voltages balanced? Check the compressor.
- Page 45 D Check of compressor winding ●Disconnect the connector between the compressor and the power module (IPM) (MUZ-HM09/12NA(2) )/(IC700) (MUZ- HM09/12NA(2) , MUZ-HM15/18/24NA(2)), and measure the resistance between the compressor terminals. <<Measurement point>> At 3 points BLK-WHT Measure the resistance between the lead wires at 3 points. BLK-RED WHT-RED <<Judgement>>...
- Page 46 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. Is the resistance of thermistor normal? When RT64 is abnormal, replace the inverter P.C. (Refer to 10-6.1.) board.
- Page 47 I Check of outdoor fan motor Check the connection between the connector CN931 and CN932. Disconnect the connectors CN931 and CN932 from the inverter P.C. board. Is the resistance between each ter- minal of outdoor fan motor normal? (Refer to 10-4.) Disconnect CN932 from the inverter P.C.
- Page 48 J Check of power supply Disconnect the connector between the compressor and the power module (IPM) (MUZ-HM09/12NA(2) )/(IC700) (MUZ- HM09/12NA(2) , MUZ-HM15/18/24NA(2)). Rectify indoor/outdoor Turn ON power supply and press connecting wire. EMERGENCY OPERATION switch. Does the upper lamp of the Is there voltage 208/230 VAC Replace the indoor OPERATION INDICATOR lamp on...
- Page 49 K Check of LEV (Expansion valve) Turn ON the power supply. <Preparation of the remote controller> 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 2 buttons for another 3 seconds.
- Page 50 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. Operate the outdoor unit by starting EMERGENCY OPERATION.
- Page 51 M How to check miswiring and serial signal error MUZ-HM09/12NA(2) 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 52 MUZ-HM15/18/24NA(2) Turn OFF the power supply. NOTE: Refer to the indoor unit service manual. 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 53 N Check of defrost heater (Optional parts) 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.
- Page 54 P 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. (3m), the indoor unit, and/or the antennas and the or is the distance between the antennas outdoor unit.
- Page 55 10-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-HM09NA - MUZ-HM12NA - MUZ-HM09NA2 - MUZ-HM12NA2 - R.V.coil (CN721) Smoothing Smoothing DB61 208/230 VAC Back side of unit capacitor (C62) capacitor (C61) 260 - 370 VDC Fuse (F801) Fuse (F701) 208/230 VAC T3.15AL250V T3.15AL250V...
- Page 56 1. Inverter P.C. board MUZ-HM09NA - MUZ-HM12NA - MUZ-HM09NA2 - MUZ-HM12NA2 - Bus-bar voltage Smoothing Smoothing Back side of unit DB61 capacitor capacitor 260-325 VDC (C63) (C62) 208/230 VAC Fuse (F701) Fuse (F801) T3.15AL250V T3.15AL250V R.V.coil (CN721) 208/230 Fuse (F901) Signal of T3.15AL250V outdoor...
- Page 57 1. Inverter P.C. board MUZ-HM15NA MUZ-HM18NA MUZ-HM15NA2 MUZ-HM18NA2 Smoothing capacitor (C63) Smoothing DB61 Back side of unit Smoothing capacitor (C62) 260 - 370 VDC capacitor (C61) R.V.coil Fuse (F701) (CN721) Fuse (F801) 208/230 VAC T3.15AL250V 208/230 VAC T3.15AL250V Fuse (F901) T3.15AL250V Output to drive outdoor...
- Page 58 1. Inverter P.C. board MUZ-HM24NA MUZ-HM24NA2 Smoothing capacitor (C63) R.V.coil (CN721) Smoothing Smoothing Back side of unit DB61 Heater connector 208/230 VAC capacitor (C62) capacitor (C61) 260 - 370 VDC (CN722) (Optional parts) Fuse (F701) Fuse (F801) 208/230 VAC T3.15AL250V T3.15AL250V Fuse (F901) T3.15AL250V...
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Page 59: Disassembly Instructions
DISASSEMBLY INSTRUCTIONS <"Terminal with locking mechanism" Detaching points> The terminal which has the locking mechanism can be detached as shown below. There are 2 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. - Page 60 OPERATING PROCEDURE PHOTOS Photo 4 Photo 5 Screws of the Screw of the conduit cover conduit plate 2. Removing the inverter assembly, inverter P.C. board Photo 6 (1) Remove the cabinet and panels. (Refer to 1.) Screws of the heat sink (2) Disconnect the lead wire to the reactor and the following support and the separator connectors:...
- Page 61 OPERATING PROCEDURE PHOTOS 4. Removing the discharge temperature thermistor, Photo 8 defrost thermistor, outdoor heat exchanger tempera- ture 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: <Inverter P.C.
- Page 62 OPERATING PROCEDURE PHOTOS 5. Removing outdoor fan motor Photo 10 Screws of the outdoor fan motor (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the following connectors: <Inverter P.C. board> CN931, CN932 (Fan motor) (3) Remove the propeller fan nut. (4) Remove the propeller fan.
- Page 63 11-2. MUZ-HM24NA MUZ-HM24NA2 NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 Screws of the top panel (1) Remove the screws of the service panel. (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover.
- Page 64 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 5 Screws of the terminal (1) Remove the cabinet and panels. (Refer to 1.) Screw of the heat sink block support and the (2) Disconnect the lead wire to the reactor and the following con- support and the separator back panel nectors:...
- Page 65 OPERATING PROCEDURE PHOTOS Outdoor heat 4. Removing the discharge temperature thermistor, Photo 8 exchanger tempera- Ambient tem- defrost thermistor, outdoor heat exchanger tempera- ture thermistor perature ture thermistor and ambient temperature thermistor thermistor (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C.
- Page 66 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2015 MITSUBISHI ELECTRIC CORPORATION 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 Specifications are subject to change without notice.