Table of Contents
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SPLIT-TYPE AIR CONDITIONERS
OUTDOOR UNIT
SERVICE MANUAL
Models
MUZ-FE09NA
MUZ-FE12NA
MUZ-FE18NA
MUZ-FE09NA
MUZ-FE12NA
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
Revision A:
• MUZ-FE18NA has been added.
Please void OBH543.
HFC
utilized
R410A
Indoor unit service manual
MSZ-FE•NA Series (OBH542)
CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS ····················· 2
3. SPECIFICATION ················································ 3
4. OUTLINES AND DIMENSIONS ························ 5
5. WIRING DIAGRAM ············································ 6
6. REFRIGERANT SYSTEM DIAGRAM ··············· 7
7. DATA ·································································· 9
8. ACTUATOR CONTROL ··································· 16
9. SERVICE FUNCTIONS ··································· 17
10. TROUBLESHOOTING ····································· 17
11. DISASSEMBLY INSTRUCTIONS ···················· 36
PARTS CATALOG (OBB543)
No. OBH543
REVISED EDITION-A
TM
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric Mr.Slim MUZ-FE09NA
Summary of Contents for Mitsubishi Electric Mr.Slim MUZ-FE09NA
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Page 1: Table Of Contents
SPLIT-TYPE AIR CONDITIONERS OUTDOOR UNIT No. OBH543 SERVICE MANUAL REVISED EDITION-A utilized R410A Models MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA Indoor unit service manual MSZ-FE•NA Series (OBH542) CONTENTS 1. TECHNICAL CHANGES ··································· 2 2. PART NAMES AND FUNCTIONS ····················· 2 3. SPECIFICATION ················································ 3 4. -
Page 2: Technical Changes
Revision A: • MUZ-FE18NA has been added. TECHNICAL CHANGES MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA 1. New model PART NAMES AND FUNCTIONS MUZ-FE09NA MUZ-FE12NA Air inlet (back and side) Piping Drain hose Air outlet Drain outlet MUZ-FE18NA Air inlet (back and side) Piping... -
Page 3: Specification
SPECIFICATION Outdoor unit model MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA 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) Capacity Rated Btu/h 12,500 13,600 19,300 Heating 17 2 580 (160~650) - Page 4 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 5: Outlines And Dimensions
OUTLINES AND DIMENSIONS MUZ-FE09NA MUZ-FE12NA Unit: inch REQUIRED SPACE Basically open 4 inch or more without any obstruction in front 15-3/4 Drain hole 1-5/8 and on both sides of the unit. Air in Air in 1-9/16 Air out 2- 3/8... -
Page 6: Wiring Diagram
WIRING DIAGRAM MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA... -
Page 7: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM Unit: inch MUZ-FE09NA MUZ-FE12NA 4-way valve Refrigerant pipe ø3/8 (with heat insulator) Muffler Outdoor heat exchanger temperature Stop valve thermistor RT68 (with service port) Outdoor Muffler Discharge heat Flared connection exchanger temperature Service thermistor port RT62 Ambient... - Page 8 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-FE12NA MUZ-FE18NA Indoor unit Max. Height difference Max. Length Outdoor unit ADDITIONAL REFRIGERANT CHARGE (R410A: oz.) NOTE: Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation.
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Page 9: Data
DATA MUZ-FE09NA MUZ-FE12NA 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 MUZ-FE09NA 10.4 0.55... -
Page 10: Performance Curve
7-2. PERFORMANCE CURVE Cooling Cooling capacity (at Rated frequency) Indoor intake air Wet-bulb temperature( F) Outdoor intake air Dry-bulb temperature(°F) MUZ-FE09NA MUZ-FE12NA SHF at rating condition = 0.76 SHF at rating condition = 0.73 = 350 CFM Airflow = 307 CFM Airflow Outdoor intake air DB temperature (°F) - Page 11 Heating Heating capacity (at Rated frequency) Outdoor intake air Wet-bulb temperature (°F) MUZ-FE12NA MUZ-FE09NA Airflow = 420 CFM Airflow = 381 CFM Outdoor intake air WB temperature (°F) Outdoor intake air WB temperature (°F) MUZ-FE18NA = 738 CFM Airflow Outdoor intake air WB temperature (°F) This value of frequency is not the same as the actual frequency in operating.
- Page 12 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 (PSIG) (PSIG) 68 70 105(°F) 68 70 105(°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-FE12NA (PSIG)
- Page 13 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 (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 14 208/230, 1, 60 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 Outdoor unit MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA Power supply phase, 208/230, 1, 60 Input 0.562 0.686 0.906 0.920 1.212 1.482 Comp. current 2.38/2.15 2.98/2.70 4.05/3.66...
- Page 15 7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY MUZ-FE09NA 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 16: Actuator Control
ACTUATOR CONTROL MUZ-FE09NA MUZ-FE12NA 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 17: Service Functions
SERVICE FUNCTIONS MUZ-FE09NA MUZ-FE12NA 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 fi nish temperature Jumper MUZ-FE09/12NA... -
Page 18: Failure Mode Recall Function
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 19 2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal. Confi rm if outdoor unit is abnormal according to the following procedures. Confi rm that the remote controller is in the failure mode recall function. With the remote controller headed towards the indoor unit, press TOO 1.
- Page 20 3. Outdoor unit failure mode table 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) —...
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Page 21: Troubleshooting Check Table
10-3. TROUBLESHOOTING CHECK TABLE Abnormal point/ Con- Symptom LED indication Condition Remedy dition Outdoor unit 1-time fl ash every Outdoor power sys- Overcurrent protection stop is continuously performed 3 times • Reconnect connector of compres- does not oper- 2.5 seconds within 1 minute after the compressor gets started, or failure of sor. - Page 22 Abnormal point/ Con- Symptom LED indication Condition Remedy dition Outdoor unit 7-time fl ash Low discharge tem- Temperature of discharge temperature thermistor has been • Refer to 10-5. "Check of LEV". operates. 2.5 seconds OFF perature protection 122°F (50°C) or less for 20 minutes. •...
- Page 23 10-4. TROUBLE CRITERION OF MAIN PARTS MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA Part name Check method and criterion Figure Defrost thermistor (RT61) Measure the resistance with a tester. Ambient temperature thermistor (RT65) Refer to 10-6. “Test point diagram and voltage”, 1. “Inverter P.C.
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Page 24: Troubleshooting Flow
10-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector between compressor and the intelligent power module (IPM). See 10-5. “Check of open phase”. Check the voltage between terminals. Are the voltages balanced? Replace the inverter P.C. board. Check the compressor. See 10-5. - Page 25 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 26 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-FE12NA Thermistor Symbol Connector, Pin No. Board...
- Page 27 I Check of outdoor fan motor MUZ-FE09NA MUZ-FE12NA 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. board.
- Page 28 J Check of power supply MUZ-FE09NA MUZ-FE12NA 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 VAC Does POWER lamp on the indoor between the indoor terminal electronic control P.C.
- Page 29 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 VAC Replace the indoor OPERATION INDICATOR on the between the indoor terminal electronic control P.C.
- Page 30 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 31 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 32 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 33 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 34 10-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-FE09NA MUZ-FE12NA Smoothing Bus-bar voltage Smoothing Smoothing capacitor DB61 capacitor capacitor Fuse (F701) Back side of unit 260-325 VDC (C63) (C62) (C61) T3.15AL250V Fuse (F801) 208/230 VAC T3.15AL250V R.V. coil...
- Page 35 MUZ-FE18NA Fuse (F62) Fuse (F601) R.V. coil (CN602) T2.0AL250V T3.15AL250V 208/230 VAC 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 temperature thermistor...
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Page 36: Disassembly Instructions
Locking lever lever. Connector 11-1. MUZ-FE09NA MUZ-FE12NA NOTE: Turn OFF power supply before disassembling. OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove the screw fixing the service panel. (Photo 1) (2) Pull down the service panel and remove it. - Page 37 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 (1) Remove the cabinet and panels. (Refer to 1.) Screws of the (2) Disconnect the lead wire to the reactor and the following relay panel connectors: <Inverter P.C. board> CN721 (R.V.coil) CN932 (Fan motor) CN641 (Defrost thermistor and discharge temperature ther-...
- Page 38 OPERATING PROCEDURE PHOTOS Photo 6 5. Removing outdoor fan motor Outdoor heat (1) Remove the cabinet and panels. (Refer to 1.) exchanger tempera- (2) Disconnect the connectors for outdoor fan motor. ture thermistor (3) Remove the propeller nut. (Photo 7) (4) Remove the propeller.
- Page 39 11-2. MUZ-FE18NA NOTE: Turn OFF power supply before disassembling. 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. (4) Remove the service panel.
- Page 40 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 4 Screw of the (1) Remove the cabinet and panels. (Refer to 1.) relay panel Screws of the (2) Disconnect the lead wire to the reactor and the following con- Inverter P.C PB support Earth wires...
- Page 41 OPERATING PROCEDURE PHOTOS 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 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C.
- Page 44 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2009 MITSUBISHI ELECTRIC CO.,LTD Distributed in Sep. 2010. No. OBH543 REVISED EDITION-A 5 New publication, effective Sep. 2010 Distributed in Jul. 2009. No. OBH543 5 Specifications subject to change without notice.