Mitsubishi Electric MUZ-HM09NA-U2 Service Manual
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Mitsubishi Electric MUZ-HM09NA-U2 Service Manual

Outdoor unit, hfc utilized r410a
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OUTDOOR UNIT
SERVICE MANUAL
Models
MUZ-HM09NA -
MUZ-HM12NA2 -
MUZ-HM15NA2 -
,
,
U1
U2
U8
,
U1
U8
U1
,
,
U1
U2
U8
,
U1
U8
U1
,
U1
U2
U1
U1
Revision E:
• MUZ-HM09/12/15/18NA-
MUZ-HM09/12/15/18/24NAH-
OBH747 REVISED EDITION-D is void.
HFC
utilized
REVISED EDITION-E
R410A
MUZ-HM18NA -
MUZ-HM18NA2 -
MUZ-HM18NAH -
MUZ-HM24NA -
MUZ-HM24NA2 -
MUZ-HM24NAH -
Indoor unit service manual
MSZ-HM•NA Series (OBH746)
CONTENTS
1. TECHNICAL CHANGES ······························2
2. PART NAMES AND FUNCTIONS ··················3
3. SPECIFICATION ········································4
4. OUTLINES AND DIMENSIONS ·····················9
5. WIRING DIAGRAM ··································· 11
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)
and
U2
have been added.
U1
No. OBH747
,
U1
U2
U1
U1
U1
U1
U1

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Summary of Contents for Mitsubishi Electric MUZ-HM09NA-U2

  • Page 1: Table Of Contents

    Revision E: • MUZ-HM09/12/15/18NA- MUZ-HM09/12/15/18/24NAH- have been added. OBH747 REVISED EDITION-D is void. OUTDOOR UNIT No. OBH747 utilized REVISED EDITION-E SERVICE MANUAL R410A Models MUZ-HM09NA - MUZ-HM18NA - MUZ-HM09NA2 - MUZ-HM18NA2 - MUZ-HM09NAH - MUZ-HM18NAH - MUZ-HM12NA - MUZ-HM24NA - MUZ-HM12NA2 - MUZ-HM24NA2 - MUZ-HM12NAH -...

  • Page 2: Muz-Hm09Na2

    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.

  • Page 3: Part Names And Functions

    PART NAMES AND FUNCTIONS MUZ-HM09NA MUZ-HM09NA2 MUZ-HM09NAH MUZ-HM12NA MUZ-HM12NA2 MUZ-HM12NAH MUZ-HM15NA MUZ-HM15NA2 MUZ-HM15NAH MUZ-HM18NA MUZ-HM18NA2 MUZ-HM18NAH Air inlet (back and side) Piping Air outlet Drain hose Drain outlet MUZ-HM24NA MUZ-HM24NA2 MUZ-HM24NAH Air inlet (back and side) Piping Drain hose Air outlet Drain outlet OBH747E...

  • Page 4: Specification

    SPECIFICATION MUZ-HM09NA - MUZ-HM09NA - MUZ-HM09NA - Outdoor unit model MUZ-HM09NA2 - MUZ-HM09NAH - MUZ-HM09NA2 - Btu/h 9,000 ( 3,800 ~ 10,000 ) Cooling 1 Capacity Rated (Minimum~Maximum) Btu/h 10,900 ( 4,500 ~ 11,800 ) Heating 47 1 Capacity Btu/h 6,700 (7,200) Heating 17 2 Rated (Maximum)

  • Page 5: Muz-Hm12Na2 - U8

    MUZ-HM12NA - MUZ-HM12NA - MUZ-HM12NA - Outdoor unit model MUZ-HM12NA2 - MUZ-HM12NAH - MUZ-HM12NA2 - Cooling 1 Btu/h 12,000 ( 3,800 ~ 12,200 ) Capacity Rated (Minimum~Maximum) Btu/h 12,200 ( 4,500 ~ 14,500 ) 12,200 ( 5,500 ~ 14,500 ) Heating 47 1 Capacity Heating 17 2...
  • Page 6 MUZ-HM15NA MUZ-HM18NA Outdoor unit model MUZ-HM15NA2 MUZ-HM18NA2 MUZ-HM15NAH MUZ-HM18NAH Btu/h 14,000 (3,100 - 16,000) 17,200 (5,800 - 18,000) Cooling 1 Capacity Rated (Minimum~Maximum) Btu/h 18,000 (4,800 - 18,500) 18,000 (5,400 - 20,900) Heating 47 1 Capacity Btu/h 11,500 (14,000) 11,500 (15,000) Heating 17 2 Rated (Maximum) 1,127 (187 - 1,957)
  • Page 7 MUZ-HM24NA Outdoor unit model MUZ-HM24NA2 MUZ-HM24NAH 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 8 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"...

  • Page 9: Outlines And Dimensions

    OUTLINES AND DIMENSIONS Unit: inch MUZ-HM09NA MUZ-HM09NA2 MUZ-HM09NAH MUZ-HM12NA MUZ-HM12NA2 MUZ-HM12NAH MUZ-HM15NA MUZ-HM15NA2 MUZ-HM15NAH MUZ-HM18NA MUZ-HM18NA2 MUZ-HM18NAH 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...
  • Page 10 MUZ-HM24NA MUZ-HM24NA2 MUZ-HM24NAH 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 3-3/16 33-1/16...

  • Page 11: Wiring Diagram

    WIRING DIAGRAM MUZ-HM09NA MUZ-HM09NA2 MUZ-HM12NA MUZ-HM12NA2 MUZ-HM09NA MUZ-HM09NA2 MUZ-HM12NA MUZ-HM12NA2 OBH747E...

  • Page 12: Muz-Hm15Na2 - U1

    MUZ-HM09NAH MUZ-HM12NAH MUZ-HM15NA MUZ-HM15NA2 MUZ-HM18NA MUZ-HM18NA2 OBH747E...
  • Page 13 MUZ-HM15NAH MUZ-HM18NAH OBH747E...

  • Page 14: Muz-Hm24Nah

    MUZ-HM24NA MUZ-HM24NA2 MUZ-HM24NAH OBH747E...

  • Page 15: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MUZ-HM09NA MUZ-HM09NA2 MUZ-HM09NAH MUZ-HM12NA MUZ-HM12NA2 MUZ-HM12NAH 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...
  • 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 Unit: Inch (mm) MUZ-HM24NA MUZ-HM24NA2 MUZ-HM24NAH 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...
  • 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(H) MUZ-HM09NA2 MUZ-HM12NA(H) MUZ-HM12NA2 MUZ-HM15NA(H) MUZ-HM15NA2 MUZ-HM18NA(H) MUZ-HM18NA2 MUZ-HM24NA(H) MUZ-HM24NA2 Indoor unit Max. Height difference Max. Length Outdoor unit ADDITIONAL REFRIGERANT CHARGE (R410A: oz.) NOTE: Refrigerant piping exceeding 25 ft.

  • Page 19: Data

    DATA MUZ-HM09NA MUZ-HM09NA2 MUZ-HM09NAH MUZ-HM12NA MUZ-HM12NA2 MUZ-HM12NAH MUZ-HM15NA MUZ-HM15NA2 MUZ-HM15NAH MUZ-HM18NA MUZ-HM18NA2 MUZ-HM18NAH MUZ-HM24NA MUZ-HM24NA2 MUZ-HM24NAH 7-1. PERFORMANCE DATA 1) COOLING CAPACITY Indoor air Model SHC TPC SHC TPC SHC TPC SHC TPC SHC TPC 11.0 0.67 10.3 0.73 0.79 0.83 0.86 MUZ-HM09NA(H)
  • Page 20 3) HEATING CAPACITY CORRECTIONS Refrigerant piping length (one way: ft.) Model 25 (std.) MUZ-HM09NA(H) MUZ-HM09NA2 MUZ-HM12NA(H) MUZ-HM12NA2 0.997 0.993 — MUZ-HM15NA(H) MUZ-HM15NA2 MUZ-HM18NA(H) MUZ-HM18NA2 MUZ-HM24NA(H) 0.997 0.993 0.987 MUZ-HM24NA2 4) HEATING CAPACITY Indoor air Model 0.53 0.67 0.79 0.88 10.6 0.92 11.0 0.94...
  • Page 21 7-2. PERFORMANCE CURVE Cooling capacity (at Rated frequency) Indoor intake air Wet-bulb temperature( F) Outdoor intake air DB temperature(°F) MUZ-HM09NA(H) MUZ-HM09NA2 MUZ-HM12NA(H) MUZ-HM12NA2 SHF at rating condition = 0.82 SHF at rating condition = 0.77 = 399 CFM = 399 CFM Airflow Airflow Outdoor intake air DB temperature (°F)
  • Page 22 Heating capacity (at Rated frequency) Outdoor intake air WB temperature (°F) MUZ-HM09NA(H) MUZ-HM09NA2 MUZ-HM12NA(H) MUZ-HM12NA2 Airflow = 406 CFM Airflow = 406 CFM Outdoor intake air WB temperature (°F) Outdoor intake air WB temperature (°F) MUZ-HM15NA(H) MUZ-HM15NA2 MUZ-HM18NA(H) MUZ-HM18NA2 Airflow = 463 CFM Airflow = 625 CFM...
  • Page 23 7-3. CONDENSING PRESSURE Data are based on the condition of indoor humidity 50 %. Air flow should be set to High speed. MUZ-HM09NA(H) MUZ-HM09NA2 (PSIG) (PSIG) 6870 100 105 (°F) 68 70 100 105 (°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-HM12NA - MUZ-HM12NA2 - MUZ-HM12NAH...
  • Page 24 MUZ-HM15NA(H) MUZ-HM15NA2 (PSIG) (PSIG) (°F) (°F) 100 105 Outdoor ambient temperature Outdoor ambient temperature MUZ-HM18NA(H) MUZ-HM18NA2 (PSIG) (PSIG) (°F) (°F) 100 105 Outdoor ambient temperature Outdoor ambient temperature MUZ-HM24NA(H) MUZ-HM24NA2 (PSIG) (PSIG) (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature OBH747E...
  • Page 25 Data are based on the condition of outdoor humidity 75%. Air flow should be set to High speed. Data are for heating operation without any frost. MUZ-HM09NA(H) MUZ-HM09NA2 MUZ-HM12NA - MUZ-HM12NA2 - MUZ-HM12NAH (PSIG) (PSIG) 58Hz 58Hz 75 (°F) 75 (°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-HM12NA -...
  • Page 26 MUZ-HM18NA(H) MUZ-HM18NA2 (PSIG) (PSIG) 58Hz 58Hz (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-HM24NA(H) MUZ-HM24NA2 (PSIG) (PSIG) 81Hz 81Hz (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature OBH747E...
  • 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 - MUZ-HM09NAH 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(H) 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(H) MUZ-HM18NA2 Correction of Cooling capacity Correction of Cooling total input...

  • Page 32: Actuator Control

    ACTUATOR CONTROL MUZ-HM09NA MUZ-HM09NA2 MUZ-HM09NAH MUZ-HM12NA MUZ-HM12NA2 MUZ-HM12NAH MUZ-HM15NA MUZ-HM15NA2 MUZ-HM15NAH MUZ-HM18NA MUZ-HM18NA2 MUZ-HM18NAH MUZ-HM24NA MUZ-HM24NA2 MUZ-HM24NAH 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.

  • Page 33: Service Functions

    SERVICE FUNCTIONS MUZ-HM09NA MUZ-HM09NA2 MUZ-HM09NAH MUZ-HM12NA MUZ-HM12NA2 MUZ-HM12NAH MUZ-HM15NA MUZ-HM15NA2 MUZ-HM15NAH MUZ-HM18NA MUZ-HM18NA2 MUZ-HM18NAH MUZ-HM24NA MUZ-HM24NA2 MUZ-HM24NAH 9-1. CHANGE IN DEFROST SETTING <JS> To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board (Refer to 10-6.1.). Jumper MUZ-HM09/12 MUZ-HM09...

  • Page 34: Troubleshooting

    TROUBLESHOOTING MUZ-HM09NA MUZ-HM09NA2 MUZ-HM09NAH MUZ-HM12NA MUZ-HM12NA2 MUZ-HM12NAH MUZ-HM15NA MUZ-HM15NA2 MUZ-HM15NAH MUZ-HM18NA MUZ-HM18NA2 MUZ-HM18NAH MUZ-HM24NA MUZ-HM24NA2 MUZ-HM24NAH 10-1. CAUTIONS ON TROUBLESHOOTING 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for miswiring. 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. Operational procedure The cause of abnormality cannot be found because the abnormality does not recur.
  • Page 36 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. Regardless of normal or abnormal condition, 2 short With the remote controller headed towards the indoor unit, press TOO beeps are emitted as the signal is received.
  • Page 37 NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-3.). MUZ-HM09NA MUZ-HM09NA2 MUZ-HM09NAH MUZ-HM12NA MUZ-HM12NA2 MUZ-HM12NAH OPERATION Indoor/ Outdoor unit INDICATOR Abnormal point LED indication outdoor unit Condition Remedy failure mode upper lamp (Failure mode / protection) (Outdoor P.C.
  • 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-HM15NAH MUZ-HM18NA MUZ-HM18NA2 MUZ-HM18NAH NOTE: Blinking patterns of this mode differ from the ones of MUZ-HM24NA MUZ-HM24NA2 MUZ-HM24NAH 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...
  • 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 blink 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 blink 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. MUZ-HM •...
  • Page 43 10-4. TROUBLE CRITERION OF MAIN PARTS MUZ-HM09NA MUZ-HM09NA2 MUZ-HM09NAH MUZ-HM12NA MUZ-HM12NA2 MUZ-HM12NAH MUZ-HM15NA MUZ-HM15NA2 MUZ-HM15NAH MUZ-HM18NA MUZ-HM18NA2 MUZ-HM18NAH MUZ-HM24NA MUZ-HM24NA2 MUZ-HM24NAH Part name Check method and criterion Figure Measure the resistance with a tester. Defrost thermistor (RT61) Refer to 10-6. “Test point diagram and voltage”, 1. “Inverter P.C. board”, for the chart of thermistor.
  • Page 44 10-5. TROUBLESHOOTING FLOW *Power module Disconnect the connector between the compressor and the power module*. IPM HM09/12NA(2) HM09/12NA(2) HM09/12NA - IC700 See 10-5. “Check of open phase”. Check the voltage between terminals. HM15/18/24NA(2) HM09/12/15/18/24NAH Replace the inverter P.C. board. Are the voltages balanced? Check the compressor.
  • Page 45 compressor terminals. *Power module <<Measurement point>> IPM HM09/12NA(2) At 3 points HM09/12NA(2) BLK-WHT Measure the resistance between the lead wires at 3 points. HM09/12NA - BLK-RED IC700 HM15/18/24NA(2) WHT-RED HM09/12/15/18/24NAH <<Judgement>> Refer to 10-4. NOTE: Be sure to zero the ohmmeter before measurement. <<Judgement>>...
  • Page 46 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 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. board, and turn on the power supply.
  • Page 48 Disconnect the connector between the compressor and the power module* Turn ON power supply and press Rectify indoor/outdoor EMERGENCY OPERATION switch. connecting wire. Does the upper lamp of the Is there voltage 208/230 V AC Replace the indoor OPERATION INDICATOR lamp on between the indoor terminal electronic control P.C.
  • Page 49 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. Make sure that the indicators on the LCD screen lease the buttons.
  • Page 50 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 MUZ-HM09/12NA(2) Turn OFF the power supply. MUZ-HM09/12NAH 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. Press EMERGENCY OPERATION switch once. Does the OPERATION INDICATOR lamp light unit>...
  • Page 52 MUZ-HM15/18/24NA(2) Turn OFF the power supply. MUZ-HM15/18/24NAH 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 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.
  • Page 54 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 MUZ-HM09NA - MUZ-HM09NA2 - MUZ-HM12NA - MUZ-HM12NA2 - MUZ-HM15NA - MUZ-HM15NA2 - MUZ-HM18NA - MUZ-HM18NA2 - Heater connector Smoothing Smoothing DB61 (CN722) capacitor (C62) capacitor (C61) 260 - 370 V DC (Optional parts) R.V.coil/214S (CN721) Fuse (F701) Fuse (F801)
  • Page 56 MUZ-HM09NA - MUZ-HM12NA - MUZ-HM09NA2 - MUZ-HM12NA2 - Bus-bar voltage Smoothing Smoothing DB61 capacitor capacitor 260-325 V DC (C63) (C62) R.V.coil/ 21S4 208/230 V AC Fuse (F701) Fuse (F801) (CN721) T3.15AL250V T3.15AL250V 208/230 V AC Fuse (F901) Signal of T3.15AL250V outdoor fan motor (CN931)
  • Page 57 MUZ-HM09NA - MUZ-HM09NAH - MUZ-HM12NA - MUZ-HM12NAH - MUZ-HM15NA - MUZ-HM15NAH - MUZ-HM18NA - MUZ-HM18NAH - R.V.coil Smoothing Smoothing DB61 (CN721) capacitor (C62) capacitor (C61) 260 - 370 V DC 115 V AC Fuse (F801) Fuse (F701) 115 V AC T3.15AL250V T3.15AL250V Output to...
  • Page 58 MUZ-HM24NA MUZ-HM24NA2 MUZ-HM24NAH Smoothing capacitor (C63) R.V.coil/21S4 Smoothing Smoothing (CN721) DB61 Heater connector capacitor (C62) capacitor (C61) 208/230 V AC 260 - 370 V DC (CN722) (Optional parts) Fuse (F701) Fuse (F801) 208/230 V AC T3.15AL250V T3.15AL250V Fuse (F901) T3.15AL250V Output to drive outdoor fan motor...

  • Page 59: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS <Detaching method of the terminal with locking mechanism> The terminal which has the locking mechanism can be detached as shown below. There are 2 types of the terminals 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/FIGURE Photo 4 Photo 5 Screws of the Screw of the conduit cover conduit plate Photo 6 (1) Remove the cabinet and panels. (Refer to section 1.) Screws of the heat sink (2) Disconnect the lead wire to the reactor and the following support and the separator connectors: <Inverter P.C.
  • Page 61 OPERATING PROCEDURE PHOTOS/FIGURES Photo 8 (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C. board> CN641 (Defrost thermistor and discharge temperature ther- mistor) CN643 (Ambient temperature thermistor) CN644 (Outdoor heat exchanger temperature thermistor) (3) Pull out the discharge temperature thermistor from its holder.
  • Page 62 OPERATING PROCEDURE PHOTOS/FIGURE Photo 10 Screws of the outdoor fan motor (1) Remove the cabinet and panels. (Refer to section 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. (5) Remove the screws fixing the fan motor.
  • Page 63 11-2. MUZ-HM24NA MUZ-HM24NAH MUZ-HM24NA2 NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 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. Screws (4) Remove the service panel.
  • Page 64 OPERATING PROCEDURE PHOTOS/FIGURE Photo 5 Screws of the terminal (1) Remove the cabinet and panels. (Refer to section 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/FIGURES Outdoor heat Photo 8 exchanger tempera- Ambient tem- ture thermistor perature thermistor (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C. board> CN641 (Defrost thermistor and discharge temperature ther- mistor) CN643 (Ambient temperature thermistor)
  • Page 66 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Issued: Mar. 2019. No. OBH747 REVISED EDITION-E Issued: Jul. 2017. No. OBH747 REVISED EDITION-D . OBH747 REVISED EDITION-C Issued: Mar. 2016. No. OBH747 REVISED EDITION-B . OBH747 REVISED EDITION-A .

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