SERVICE MANUALCONTENTS1. TECHNICAL CHANGES ··································· 32. PART NAMES AND FUNCTIONS ····················· 33. SPECIFICATION ··
10107-2. PERFORMANCE CURVE657075757065121068Indoor intake air DB temperature (°F)= 381 CFMAirflow15 25 35 45 55Outdoor intake air WB temperature (°F)0
11117-3. CONDENSING PRESSURECoolingData is based on the condition of indoor humidity 50 %.Air flow should be set to High speed.MUZ-FD12NA(PSIG)Condens
757065(PSIG) (PSIG)Condensing pressureOutdoor ambient temperature14 20 25 30 35 40 45 50 55 60 65 70(°F)220200180160140240260280320300340360380400Indo
13137-4. STANDARD OPERATION DATAModel MSZ-FD09NA MSZ-FD12NAItem Unit Cooling Heating Cooling Heating TotalCapacity Btu/h 9,000 10,900 12,000 13,600SHF
147-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCYCapacity correction factorsInput correction factorsInput correction factorsCapacity c
15158ACTUATOR CONTROLMUZ-FD09NA MUZ-FD12NA8-2. R.V. COIL CONTROLHeating . . . . . . . . . . . . . . . . . ON Cooling . . . . . . . . . . . . . . . .
16SERVICE FUNCTIONS99-1. CHANGE IN DEFROST SETTING Changing defrost finish temperature <JS> To change the defrost finish temperature, cut/sold
17Outline of the functionThis air conditioner can memorize the abnormal condition which has occurred once.Even though LED indication listed on the tro
18Does POWER lamp on the indoor unit blink at the interval of 0.5 seconds?Blinks: The outdoor unit is abnormal. Beep is emitted at the same timing as
19 3. Outdoor unit failure mode tablePOWER lamp(Indoor unit) Abnormal point (Failure mode / protection) LED indication(Outdoor P.C. board) Conditio
2Revision A:• 3. SPECIFICATION has been corrected.
2010-3. TROUBLESHOOTING CHECK TABLENo. Symptom LED indication Abnormal point/ Condition Condition Correspondence 1Outdoor unit does not oper-ate. 1-t
21No. Symptom LED indication Abnormal point/ Condition Condition Correspondence 18Outdoor unit operates. 7-time fl ash 2.5 seconds OFF Low discharge t
2210-4. TROUBLE CRITERION OF MAIN PARTSMUZ-FD09NA MUZ-FD12NAPart name Check method and criterion FigureDefrost thermistor (RT61) Ambient temperatur
2310-5. TROUBLESHOOTING FLOWAre the voltages balanced?Disconnect the connector (CN61) between compressor and the intelligent power module (IPM).Replac
24 F Check of compressor start failure D Check of compressor winding E Check of compressor operation time●Disconnect the connector (CN61) between t
25Is the thermistor normal? (Refer to 10-6.1.)Reconnect the connector of thermistor.Turn ON the power supply and press EMERGENCY OPERATION switch. NoR
26 I Check of outdoor fan motor J Check of power supplyIs the outdoor fan motor normal?(Refer to 10-4.)Replace the outdoor fan motor.Disconnect CN93
27Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor
28Check the outdoor fan motor. (Refer to10-5. .)Is the fuse (F901) blown on the in-verter P.C. board?Check the connection of the connectors (CN932) of
29 M How to check miswiring and serial signal errorTurn OFF the power supply.Is there rated voltage in the power supply?YesNoTurn ON the power supply
331TECHNICAL CHANGESMUZ-FD09NAMUZ-FD09NA - U1MUZ-FD12NAMUZ-FD12NA - U11. New modelPART NAMES AND FUNCTIONS2MUZ-FD09NA MUZ-FD12NAAir outletDrain outle
30 N Electromagnetic noise enters into TV sets or radiosYesIs the unit grounded?NoGround the unit.YesIs the distance between the antennas and the ind
3110-6. TEST POINT DIAGRAM AND VOLTAGE-4 14 32 50 68 86 1040102030405060708090100Temperature(°F)Defrost thermistor(RT61)Ambient temperature thermistor
3211-1. MUZ-FD09NA MUZ-FD12NANOTE : Turn OFF power supply before disassembling.OPERATING PROCEDURE PHOTOS1. Removing the cabinet(1) Remove the screw
33OPERATING PROCEDUREPHOTOS2. Removing the inverter assembly, inverter P.C. board(1) Remove the cabinet and panels. (Refer to 1.)(2) Disconnect the le
34OPERATING PROCEDUREPHOTOS5. Removing outdoor fan motor(1) Remove the cabinet and panels. (Refer to 1.)(2) Disconnect the connectors for outdoor fan
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HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2008 MITSUBISHI ELECTRIC ENGINEERING CO.,LTDDistributed in Ma
443SPECIFICATIONOutdoor unit model MUZ-FD09NA MUZ-FD12NA Capacity Rated (Minimum~Maximum) Cooling 1Btu/h 9,000 (2,800~9,000) 12,000 (2,800~12,000)Hea
55Test conditionARI Mode Test Indoor air condition Outdoor air condition Dry bulb (°F) Wet bulb (°F) Dry bulb (°F) Wet bulb (°F) SEER (Cooling)
66OUTLINES AND DIMENSIONS4Unit: inchMUZ-FD09NA MUZ-FD12NALiquid pipe :1/4 (flared)Gas pipe :3/8 (flared) 6-23/3225-7/82-23/321-3/415-3/412 ~ 12-3/4
775WIRING DIAGRAMMUZ-FD09NA MUZ-FD12NA
86REFRIGERANT SYSTEM DIAGRAMUnit:inchMUZ-FD09NA MUZ-FD12NAOutdoorheatexchangerFlared connectionDefrostthermistorRT61DischargetemperaturethermistorRT6
9DATA7MUZ-FD09NA MUZ-FD12NA7-1. PERFORMANCE DATA 1) COOLING CAPACITYModel Indoor air Outdoor intake air DB temperature (˚F) IWB 75 85 95 105 115(˚F
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