Table of Contents
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OUTDOOR UNIT
SERVICE MANUAL
Models
MUZ-FE09NA
MUZ-FE09NA
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1
MUZ-FE12NA1
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1
Revision G:
• A warning when opening or closing the
valve has been added.
OBH543 REVISED EDITION-F is void.
HFC
utilized
R410A
Indoor unit service manual
MSZ-FE•NA Series (OBH542)
CONTENTS
1. TECHNICAL CHANGES ······························3
2. PART NAMES AND FUNCTIONS ··················3
3. SPECIFICATION ········································4
4. OUTLINES AND DIMENSIONS ·····················6
5. WIRING DIAGRAM ·····································7
6. REFRIGERANT SYSTEM DIAGRAM ·············9
7. DATA······················································ 11
8. ACTUATOR CONTROL ····························· 18
9. SERVICE FUNCTIONS ······························ 19
10. TROUBLESHOOTING ······························· 19
11. DISASSEMBLY INSTRUCTIONS ················· 38
PARTS CATALOG (OBB543)
No. OBH543
REVISED EDITION-G
TM
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Table of Contents
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Summary of Contents for Mitsubishi Electric MUZ-FE09NA
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Page 1: Table Of Contents
• A warning when opening or closing the valve has been added. OBH543 REVISED EDITION-F is void. OUTDOOR UNIT No. OBH543 REVISED EDITION-G utilized SERVICE MANUAL R410A Models MUZ-FE09NA MUZ-FE09NA MUZ-FE09NAH MUZ-FE12NA MUZ-FE12NA1 MUZ-FE12NAH Indoor unit service manual MUZ-FE18NA MSZ-FE•NA Series (OBH542) CONTENTS 1. - Page 2 Revision A: • MUZ-FE18NA has been added. Revision B: • MUZ-FE09NA - and MUZ-FE12NA1 have been added. Revision C: • Specification has been corrected.
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Page 3: Muz-Fe09Nah
2. Inverter P.C. board has been changed. MUZ-FE09NA MUZ-FE09NAH MUZ-FE12NA1 MUZ-FE12NAH 1. Defrost heater has been added. 2. Inverter P.C. board has been changed. PART NAMES AND FUNCTIONS MUZ-FE09NA MUZ-FE09NAH MUZ-FE12NA MUZ-FE12NA1 MUZ-FE12NAH Air inlet (back and side) Piping Drain hose Air outlet Drain outlet MUZ-FE18NA... -
Page 4: Specification
SPECIFICATION MUZ-FE12NA MUZ-FE09NA MUZ-FE12NA1 MUZ-FE18NA Outdoor unit model MUZ-FE09NAH MUZ-FE12NAH Btu/h 9,000 (2,800~9,000) 12,000 (2,800~12,000) 18,000 (8,200~25,200) Cooling *1 Capacity Btu/h 10,900 (3,000~18,000) 13,600 (3,000~21,000) 21,600 (7,500~29,700) Heating 47 *1 Rated (Minimum~Maximum) 12NA 8,300(13,600) Capacity Btu/h 6,700 (12,500) 11,700 (21,600) - Page 5 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 6: Outlines And Dimensions
OUTLINES AND DIMENSIONS MUZ-FE09NA MUZ-FE09NAH MUZ-FE12NA MUZ-FE12NA1 MUZ-FE12NAH Unit: inch REQUIRED SPACE Basically open 4 inch or more Drain hole 1-5/8 (FE09/12NA) without any obstruction in front 15-3/4 Drain hole 1-5/16 (FE09/12NAH) and on both sides of the unit. Air in... -
Page 7: Wiring Diagram
WIRING DIAGRAM MUZ-FE09NA MUZ-FE12NA MUZ-FE09NA MUZ-FE12NA1 OBH543G... - Page 8 MUZ-FE09NAH MUZ-FE12NAH MUZ-FE18NA OBH543G...
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Page 9: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM Unit: inch MUZ-FE09NA MUZ-FE09NAH MUZ-FE12NA MUZ-FE12NA1 MUZ-FE12NAH 4-way valve Refrigerant pipe ø3/8 (with heat insulator) Muffler Outdoor heat exchanger temperature Stop valve thermistor (with service port) RT68 Outdoor Muffler Discharge heat Flared connection exchanger temperature Service thermistor... - Page 10 MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Refrigerant piping: ft. Piping size O.D: in. Model Max. Length Max. Height difference Liquid MUZ-FE09NA MUZ-FE09NAH MUZ-FE12NA MUZ-FE12NA1 MUZ-FE12NAH MUZ-FE18NA 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 11: Data
DATA MUZ-FE09NA MUZ-FE09NAH MUZ-FE12NA MUZ-FE12NA1 MUZ-FE12NAH MUZ-FE18NA 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 0.58 10.3 0.63 0.68 0.72 0.75... - Page 12 Cooling Cooling capacity (at Rated frequency) Indoor intake air Wet-bulb temperature( F) Outdoor intake air DB temperature(°F) MUZ-FE09NA MUZ-FE09NAH MUZ-FE12NA MUZ-FE12NA1 MUZ-FE12NAH SHF at rating condition = 0.73 SHF at rating condition = 0.76 = 350 CFM Airflow = 307 CFM Airflow Outdoor intake air DB temperature (°F)
- Page 13 Heating Heating capacity (at Rated frequency) Outdoor intake air WB temperature (°F) MUZ-FE09NA MUZ-FE12NA MUZ-FE12NA1 Airflow = 381 CFM Airflow = 420 CFM Outdoor intake air WB temperature (°F) Outdoor intake air WB temperature (°F) MUZ-FE09NAH MUZ-FE12NAH Airflow = 381 CFM...
- Page 14 7-3. CONDENSING PRESSURE Cooling Data is based on the condition of indoor humidity 50 %. Air flow should be set to High speed. MUZ-FE09NA MUZ-FE09NAH (PSIG) (PSIG) 68 70 105(°F) 68 70 105(°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-FE12NA MUZ-FE12NA1 MUZ-FE12NAH...
- Page 15 Heating 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-FE09NA MUZ-FE09NAH (PSIG) (PSIG) 58Hz 58Hz 15 20 25 30 35 40 45 50 55 60 65 70(°F) 20 25 30 35 40 45 50 55 60 65 70(°F)
- Page 16 MSZ-FE18NA 208/230, Power supply phase, Input 0.018 0.024 0.024 0.030 0.058 Fan motor current 0.19/0.17 0.25/0.23 0.25/0.23 0.32/0.29 0.56/0.51 MUZ-FE12NA MUZ-FE09NA Outdoor unit MUZ-FE12NA1 MUZ-FE18NA MUZ-FE09NAH MUZ-FE12NAH 208/230, Power supply phase, Input 0.562 0.686 0.906 0.920 1.212 1.482 Comp. current 2.38/2.15...
- Page 17 7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY MUZ-FE09NA MUZ-FE09NAH Correction of Cooling capacity Correction of Cooling total input Correction of Heating total input Correction of Heating capacity (Hz) (Hz) (Hz) (Hz) The operational frequency of compressor The operational frequency of compressor...
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Page 18: Actuator Control
ACTUATOR CONTROL MUZ-FE09NA MUZ-FE09NAH MUZ-FE12NA MUZ-FE12NA1 MUZ-FE12NAH MUZ-FE18NA 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 19: Service Functions
SERVICE FUNCTIONS MUZ-FE09NA MUZ-FE09NAH MUZ-FE12NA MUZ-FE12NA1 MUZ-FE12NAH MUZ-FE18NA 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 finish temperature... - Page 20 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-FE09NA MSZ-FE18NA 1.
- Page 21 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 *1.
- Page 22 3. Table of outdoor unit failure mode recall function OPERATION Indoor/ INDICATOR Outdoor unit Abnormal point LED indication outdoor unit POWER lamp Condition Remedy failure mode (Failure mode/protection) (Outdoor P.C. board) failure mode Upper lamp recall function recall function (Indoor unit) None (Normal) —...
- Page 23 10-3. TROUBLESHOOTING CHECK TABLE Abnormal point/ Symptom LED indication Condition Remedy Condition Outdoor unit 1-time blink every Outdoor power sys- Overcurrent cut-out operates 3 consecutive times within 1 • Reconnect connector of compres- does not oper- 2.5 seconds minute after the compressor gets started, or failure of restart of sor.
- Page 24 Refer to 10-5. "How to check inverter/compressor". 10-4. TROUBLESHOOTING CRITERION OF MAIN PARTS MUZ-FE09NA MUZ-FE09NAH MUZ-FE12NA MUZ-FE12NA1 MUZ-FE12NAH MUZ-FE18NA Part name Check method and criterion Figure Defrost thermistor Measure the resistance with a tester.
- Page 25 Part name Check method and criterion Figure Measure the resistance using a tester. (Part temperature: 14 ~ 104°F (-10 ~ 40°C)) R. V. coil (21S4) Normal 0.97 ~ 1.38 kΩ Measure the resistance using a tester. (Part temperature: 14 ~ 104°F (-10 ~ 40°C)) MUZ-FE09/12NA MUZ-FE09/12NAH MUZ-FE12NA1 Color of lead wire Normal...
- Page 26 10-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector between compressor and the intelligent power module (IPM). 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. See 10-5.
- Page 27 D Check of compressor winding ● Disconnect the connector between the compressor and intelligent power module, 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 28 Turn ON the power supply and press EMERGENCY OPERATION switch. Does the unit operate for 10 minutes or more Replace the inverter P.C. board. without showing thermistor abnormality? OK (Cause is poor contact.) MUZ-FE09NA MUZ-FE09NAH MUZ-FE12NA MUZ-FE12NA1 MUZ-FE12NAH Thermistor Symbol Connector, Pin No. Board...
- Page 29 I Check of outdoor fan motor MUZ-FE09NA MUZ-FE09NAH MUZ-FE12NA MUZ-FE12NA1 MUZ-FE12NAH Disconnect CN932 from the inverter P.C. board, and measure the resistance of the outdoor fan motor. Is the outdoor fan motor normal? Replace the outdoor fan motor. (Refer to 10-4.) Replace the inverter P.C.
- Page 30 J Check of power supply MUZ-FE09NA MUZ-FE09NAH MUZ-FE12NA MUZ-FE12NA1 MUZ-FE12NAH Disconnect the connector (CN61) between compressor and intelligent power module. Rectify indoor/outdoor Turn ON power supply and press connecting wire. EMERGENCY OPERATION switch. Replace the indoor Is there voltage 208/230 V AC...
- Page 31 MUZ-FE18NA Disconnect the connector between compressor and intelligent power module. Rectify indoor/outdoor Turn ON power supply and press connecting wire. EMERGENCY OPERATION switch. Does the upper lamp of Is there voltage 208/230 V AC Replace the indoor OPERATION INDICATOR on the between the indoor terminal electronic control P.C.
- Page 32 MSZ-FE09NA MSZ-FE18NA K Check of LEV (Expansion valve) MSZ-FE12NA 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.
- Page 33 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. *Only for MUZ-FE18NA Operate the outdoor unit by starting EMERGENCY OPERATION.
- Page 34 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. Check the wiring. Is there rated voltage between outdoor terminal block S1 and S2? Press EMERGENCY OPERATION switch once.
- Page 35 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 36 10-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-FE09NA MUZ-FE09NAH MUZ-FE12NA MUZ-FE12NA1 MUZ-FE12NAH Bus-bar voltage Smoothing Smoothing Smoothing Heater connector DB61 capacitor capacitor capacitor (CN722) Fuse (F701) Back side of unit 260-325 V DC (C63) (C62) MUZ-FE•NAH (C61) T3.15AL250V...
- Page 37 MUZ-FE18NA Fuse (F62) Fuse (F601) R.V. coil (CN602) T2.0AL250V T3.15AL250V 208/230 V AC Jumper wire for changing defrost setting (JS) Jumper wire for pre-heat control setting (JK) Signal of out- Defrost thermistor door fan motor /RT61 (CN671) (CN931) Discharge temperature thermistor/RT62 (CN671) Outdoor heat exchanger...
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Page 38: Disassembly Instructions
Locking lever lever. Connector 11-1. MUZ-FE09NA MUZ-FE09NAH MUZ-FE12NA MUZ-FE12NA1 MUZ-FE12NAH : Indicates the visible parts in the photos/figures. NOTE: Turn OFF power supply before disassembly. : Indicates the invisible parts in the photos/figures. OPERATING PROCEDURE PHOTOS/FIGURES 1. - Page 39 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly, inverter P.C. board Photo 4 Screws of the (1) Remove the cabinet and panels. (Refer to section 1.) terminal block (2) Disconnect the lead wire to the reactor and the following Screws of the heat sink support and the connectors: support and the separator...
- Page 40 OPERATING PROCEDURE PHOTOS/FIGURES 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 section 1.) Outdoor heat (2) Disconnect the lead wire to the reactor and the following exchanger tempera- connectors: ture thermistor...
- Page 41 11-2. MUZ-FE18NA NOTE: Turn OFF power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 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. (4) Remove the service panel.
- Page 42 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly, inverter P.C. board Photo 4 Screw of the (1) Remove the cabinet and panels. (Refer to section 1.) relay panel Screws of the (2) Disconnect the lead wire to the reactor and the following con- Inverter P.C PB support Ground wires...
- Page 43 OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the discharge temperature thermistor, Photo 6 defrost thermistor, outdoor heat exchanger tempera- Outdoor heat Ambient tem- exchanger tempera- ture thermistor and ambient temperature thermistor perature ture thermistor 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.
- Page 44 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2009 MITSUBISHI ELECTRIC CORPORATION Issued: Jun. 2021. No. OBH543 REVISED EDITION-G Issued: Jan. 2015. No. OBH543 REVISED EDITION-F Issued: Dec. 2012. No. OBH543 REVISED EDITION-E Issued: Apr. 2012. No. OBH543 REVISED EDITION-D Issued: Apr.