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MUZ-FE Service Manual

1. Bus bar voltage Smoothing Smoothing Smoothing Heater connector DB61 capacitor capacitor capacitor p F701 CN722 Back side of unit use 260 325 VDC C63 C62 C61 T3 15AL250V MUZ FE NAH C Fuse F801 208 230 VAC T3 15AL250V R V coil LESS CN721 EE GET es o s ve jm 208 230 VAC ER ES et Io Ar o ONZ pczso soov a pe oo Blo or me el 2 4t 2 Se o s lg 8 T3 15AL250V E 3 A MERE E Bn Fuse F901 EC cpi ar Shei i T3 15AL250V mo dE Ue 3 Ves Stenay S meor p Jail 3 ef n a4 D 7 Pd MORBO Output to jus Wy lU B ee le Lo ges J drive com um cera aaf ee ie pressor ni Lu rin Hij rd LDU Ile st Oe 0 or 8208 230 VAC orad d 3 EN LDV Ie Rs zio 02 BY o aS 7 Bo o LDW i im 205 p di m tt 59 rn Ou o
2. LEV connector CN724 a eS o o elejejo o o o o o o E 000000 JP715 Bus bar voltage 294 370 VDC a Fin temperature thermistor RT64 0 0 32 60 68 86 104 122 140 158 176 194 212 230 248 32 50 68 86 104122 140 158 176 Temperature F 37 Temperature F 11 DISASSEMBLY INSTRUCTIONS lt Terminal with locking mechanism Detaching points gt The terminal which has the locking mechanism can be detached as shown below There are two 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 1 Slide the sleeve and check if there is a locking lever or not 2 The terminal with this connector has the locking mechanism Sleeve Slide the sleeve Hold the sleeve and Pull the terminal while pull out the terminal pushing the locking slowly lever Connector 11 1 MUZ FEO9NA MUZ FEO9NAH MUZ FE12NA MUZ FE12NA1 MUZ FE12NAH NOTE Turn OFF power supply before disassembly PHOTOS OPERATING PROCEDURE 1 Removing
3. Jumper wire for pre heat control setting JK Defrost thermistor RT61 CN671 Discharge temperature Gy vA he thermistor RT62 ed FT R CN671 Be o f Outdoor heat exchanger temperature thermistor RT68 CN671 Ambient temperature thermistor RT65 CN672 Fin temperature thermistor RT64 CN673 Defrost thermistor RT61 Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT68 JP30 Resistance kQ OBH543F 32 50 68 Temperature F Resistance kQ Rta temperature thermistor RT62
4. 2 L61 ERI LEES Ed ORN ui EED ERN BLK EL BLK BEK 7T d B ilo La aK H BE 1 1 PARTS W gp Ser gp TOW eax BLK LOV 2 1 GROUND NA 100 j LS PER SUPPLY cel Joan prs 1 phase 60Hz D INVERTER P C BOARD ouo cH T NOTES M B ne 9 91 Ig ol 1 o ol 9 9 o eoo 5 EN 1 About the indoor side electric Gs F d A 1 PLE 5 T From INDOOR UNIT wiring refer to the indoor T CONNECTING WIRES unit electric wiring diagram 37 T64 68 RIGS RIEL RTG SI 2 24 for servicing MF 2 Use copper conductors only EET TS For field wiring LEV EN 208 230V SYMBOL NAME SYMBOL NAME SYMBOL NAME mast CT CURRENT TRANSFORMER L62 COIL area OUTDOOR HEAT EXCHANGER C61 C62 C63 SMOOTHING CAPACITOR LEV EXPANSION VALVE COIL TEMP THERMISTOR DB61 DB65 DIODE MODULE MC COMPRESSOR TB2 TERMINAL BLOCK DSA SURGE ABSORBER MF FAN MOTOR TR821 SWITCHING POWER TRANSISTOR F701 F801 F901 FUSE T3 L5AL250V PTC64 PTC65 CIRCUIT PROTECTION T801 TRANSF RMER H DEFROST HEATER OPT ION PARTS RT61 DEFROST THERMISTOR X63 X64 X66 RELAY IC802 INTELLIGENT POWER DEVICE RT62 DISCHARGE TEMP THERMISTOR 2154 REVERSING VALVE COIL IPM 1 932 INTELLIGENT POWER MODULE RT64 FIN TEMP THERMISTOR 26H HEATER PROTECTORIOPT LON PARTS L61 REACTOR RT65 AMBIENT T
5. 29 32 Gas pipe 6 23 32 REQUIRED SPACE E 1554 Drain hole 41 5 16 FE09 12NAH R Air in i Air in c 2 3 8 13 16 Oval hole 718 handle 9 N N o T af LEM LE LEE OMADINI z a 11 29 32 I 2 5 15 16 19 11 16 Si 31 1 2 2 23 32 s 16 7 16 Drain hole 1 5 8 Air in 1 9 16 13 14 3 16 Air out 19 11 16 33 1 16 3 3 16 34 5 8 17 25 32 OBH543F 2 holes 13 32 X 13 16 Unit inch Basically open 4 inch or more without any obstruction in front and on both sides of the unit Open two sides of left right or rear side Liquid pipe 1 4 flared 3 8 flared Service panel Liquid refrigerant pipe joint Refrigerant pipe flared 3 8 Ce Fo 6 1 2 3 29 32 7 11 16 Gas refrigerant pipe joint Refrigerant pipe flared 5 8 5 WIRING DIAGRAM MUZ FE09NA MUZ FE12NA
6. 5 0 8 2 o c o o o o e 65 75 85 95 105 115 Outdoor intake air DB temperature F MUZ FE18NA SHF at rating condition 0 84 Airflow 634 CFM 1 5 71 amp 14 67 P Lf 63 a 1 85 12 F 5e perature Bo odd gir WB te 5 10 ndoo intake S e 0E 70 75 80 85 90 95 100 105 110 115 Outdoor intake air DB temperature F This value of frequency is not the same as the actual frequency in operating Refer to 7 5 and 7 6 for the relationships between frequency and capacity OBH543F MUZ FE12NA MUZ FE12NA1 MUZ FE12NAH SHF at rating condition 0 73 Airflow 350 CFM c 1 3 9 amp 12 ds 5S 1 raure 71 2 eem LT 67 os 1 0 63 S os indoor PE EE 205 8 08 a S 0 7 e 65 75 85 95 105 115 Outdoor intake air DB temperature F 12 Heating Heating capacity at Rated frequency 59 1 3 68 1 2 EN 79 5 1 1 e 5 S en a 1 0 V Ev o x 47 Se 9 od 1721 oo 509 e 1 NS sg 9 we pet 1 25 08 Doe 12E Eg 8 woe 7 5 22 5 g 06 Tz 0 5 0 4 4 5 14 23 32 41 50 59 Outdoor intake air WB temperature
7. te exe oe NM 890 NN 68 70 75 80 85 90 95 100 105 F Outdoor ambient temperature MUZ FE12NA MUZ FE12NA1 MUZ FE12NAH PSIG 580 540 500 460 420 Condensing pressure 380 340 300 260 68 70 75 80 85 90 95 100 105 F Outdoor ambient temperature MUZ FE18NA PSIG 480 EN EN A Condensing pressure 4 280 68 70 75 80 85 90 95 100 105 F Outdoor ambient temperature OBH543F PSIG 180 DB temperature CF 170 i et nn 165 2 155 oa 75 70 PSIG 180 75 80 85 90 95 Outdoor ambient temperature 100 105 F 175 170 o 165 Indoo L DB temperature CF 86 2 160 80 130 70 125 ne DNO PSIG 190 75 8 0 85 90 95 Outdoor ambient temperature 100 105 F 180 86 170 80 160 75 150 140 perature F 70 Suction pressure 130 120 110 68 70 14 75 80 85 90 95 Outdoor ambient temperature 100 105 F Heating Data is based o
8. IND dam o DC12 24V OR UNIT WIRES sS MUZ FE09NAH MUZ FE12NAH a m Le rac ac 00 2 L61 BLK BK BK 2 2154 ennn eenen emee QE hak CE CR DLL PEEN Ne 25 H 169 6 I el Sy X66 X64 1 1 F701 Om CM MC U 1 1 POWER SUPPLY TPM 1 phase INVERTER P C BOARD CMUD ami L i o o Ifo ol 1 o 9 o oH H S NOLES a PY e DU a er ep E Es Al al uc EPI aos m Fron INDOOR UNT 1 About the indoor side electric P T P rule 6 do wiring refer to the indoor K9 RT64 RT68 RT65 6 RT62 sq Pen ne unit electric wiring diagram MF for servicing a Sets TO INDOOR UNIT LEV WIRES 2 Use copper conductors only 208 230 For field wiring SYMBOL NAME SYMBOL NAME SYMBOL NAME C61 62 63 SMOOTHING CAPACITOR L61 REACTOR RTGS QUTDOOR HEAT EXCHANGER DB61 0865 DIODE MODULE M COMPRESSOR TEMP THERMISTOR F701 F801 F901 FUSE T3 15AL250V FAN MOTOR TB1 TB2 TERMINAL BLOCK H DEFROST HEATER PTC64 PTC65 CIRCUIT PROTECTION TR821 SWITCHING POWER TRANSISTOR IC802 POWER DEVICE RT61 DEFROST THERMISTOR T801 TRANSFORMER IPM 1 932 POWER MODULE RT62 DISCHARGE TEMP THERMISTOR X63 X64 X66 RELAY LED LED RT64 FIN T
9. Releasing the failure mode recall function y Release the failure mode recall function by the following procedures Turn OFF the power supply and turn it ON again Press RESET button of the remote controller Y Repair the failure parts Deleting the memorized abnormal condition y After repairing the unit recall the failure mode again according to Setting up the failure mode recall function mentioned above Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted Release the failure mode recall function according to Releasing the failure mode recall function mentioned above NOTE 1 Make sure to release the failure mode recall function after it is set up otherwise the unit cannot operate properly 2 If the abnormal condition is not deleted from the memory the last abnormal condition is kept memorized 3X2 Blinking pattern when the indoor unit is abnormal Blinking at 0 5 Blinking at 0 5 2 5 second OFF second interval 2 5 second OFF second interval Be D lt gt ir OFF gt _ gt e i Q Beeps Beeps 1 Beeps Repeated cycle Repeated cycle Repeated cycle 3 Blinking pattern when the outdoor unit is abnormal e Blinking at 0 5 Blinki
10. ELE Y Does POWER lamp MSZ FE09 12NA the upper lamp of OPERATION INDICATOR lamp MSZ FE18NA on Indoor unit is normal the indoor unit blink at the interval of 0 5 seconds But the outdoor unit might be abnormal because there are some abnor Blinks Either indoor or outdoor unit is abnormal Beep malities that cannot be recalled with this way is emitted same timing as the blinking Me Check if outdoor unit is abnormal accordin to the detailed outdoor unit of POWER lamp MSZ FE09 12NA the upper OFF j g lamp of OPERATION INDICATOR lamp MSZ failure mode recall function Refer to 10 2 2 FE18NA x2 Yes 31 Regardless of normal or abnormal Judgment of indoor outdoor abnormality y Blinks condition a short beep is emitted Before blinking does POWER lamp MSZ FE09 12NA the once the signal is received upper lamp of OPERATION INDICATOR lamp MSZ FE18NA stay ON for 3 seconds When it stays ON for 3 seconds without beep Yes The outdoor unit is abnormal No Y Y The outdoor unit is abnormal The indoor unit is abnormal Check the blinking pattern and identify the abnormal point by referring to Check the blinking pattern and identify the abnormal point by referring to the the outdoor unit failure mode table Refer to 10 2 3 indoor unit failure mode table Refer to indoor unit service manual Make sure to check at least two consecutive blinking cycles 3 Make sure to check at least two consecutive blinking cycles 2 l
11. Comp current 2 38 2 15 2 98 2 70 4 05 3 66 4 12 3 72 4 4714 04 5 72 5 17 Fan motor current 0 35 0 32 1 16 1 05 1 13 1 02 Refrigerant circuit Condensing pressure 376 355 402 392 373 357 Suction pressure 154 108 148 104 151 107 Discharge temperature 142 145 160 158 150 159 Condensing temperature 112 108 117 115 111 105 Suction temperature 53 36 53 34 58 41 Comp shell bottom temperature 144 128 146 129 132 136 Ref pipe length Refrigerant charge R410A Indoor unit 80 80 80 Intake air temperature 67 67 67 59 58 59 Discharge air temperature 56 55 56 Fan speed High 1 020 1 120 1 300 Airflow High 307 Wet 350 Wet 634 Wet Outdoor unit 95 95 95 Intake air temperature Fan speed Airflow OBH543F 16 7 5 CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY MUZ FEO9NA MUZ FEO9NAH Correction of Cooling capacity Correction of Cooling total input Correction of Heating capacity Correction of Heating total input 1 5 1 5 2 0 o o o g S 3 0 5 Oo S 5 1 o 510 S 49 5 s c S 5 5 920 e 5 E s 1 S 9 5 205 9 05 9 o o 5 1 0 5 0 a a a c 1 150 Hz _ 0 50 100 150 Hz
12. Disconnect the connectors CN931 and CN932 from the inverter board Check the connection between the connector CN931 and CN932 Y Is the resistance between each ter minal of outdoor fan motor normal Refer to 10 4 No Yes Fixed to either 5 VDC Y Disconnect CN932 from the inverter P C board and turn on the power supply Y Rotate the outdoor fan motor manually and measure the voltage of CN931 Between 1 and 5 Between 2 and 5 Between 3 and 5 No Y Replace the outdoor fan motor OBH543F Y Does the voltage between each terminal become 5 and 0 VDC repeatedly Yes Y Does the outdoor fan motor rotate smoothly Yes Y Replace the inverter P C board 29 J Check of power supply MUZ FEO9NA MUZ FEO9NAH MUZ FE12NA MUZ FE12NA1 MUZ FE12NAH Disconnect the connector CN61 between compressor and intelligent power module Turn ON power supply and press Rectify indoor outdoor EMERGENCY OPERATION switch connecting wire Y Yes Does POWER lamp the indoor Is there voltage 208 230 VAC Replace the indoor unit light up P No between the indoor terminal No electronic control P C block 1 2 board Yes Y Wase DEGI x yrs EE Replace the inverter on the inverter P C board Yes 4n
13. 0 89 12 0 8 8 0 96 11 2 8 1 63 10 5 0 85 11 3 9 7 0 92 10 3 8 9 71 14 6 1 24 19 4 13 7 1 33 18 0 12 7 67 16 3 1 17 18 0 15 1 1 27 16 7 14 1 63 17 7 1 12 16 9 16 5 1 21 15 4 15 0 NOTE 1 IWB Intake air wet bulb temperature TC Total Capacity X10 Btu h SHC Sensible Heat Capacity x10 Btu h TPC Total Power Consumption KW 2 SHC is based on 80 F of indoor Intake air DB temperature 2 COOLING CAPACITY CORRECTIONS Refrigerant piping length one way ft 25 std 40 65 1 0 0 878 Indoor air Outdoor intake air WB temperature F 25 35 43 IE TC TPC TC TPC TC TPC 75 7 9 0 66 9 4 0 73 10 6 0 77 70 8 2 0 64 9 6 0 71 10 9 0 75 65 8 6 0 62 10 0 0 69 11 2 0 73 75 7 9 0 79 9 4 0 73 10 6 0 77 70 8 2 0 77 9 6 0 71 10 9 0 75 65 8 6 0 75 10 0 0 69 11 2 0 73 75 9 9 0 86 11 8 0 96 13 3 1 00 70 10 2 0 84 12 0 0 93 13 6 0 98 65 10 7 0 81 12 4 0 91 14 0 0 96 75 9 9 0 99 11 8 0 96 13 3 1 00 70 i 10 2 0 97 12 0 0 93 13 6 0 98 65 10 7 0 94 12 4 0 91 14 0 0 96 75 15 7 1 35 18 7 1 50 21 1 1 58 70 16 2 1 32
14. Abnormal point Condition Condition Remedy Outdoor unit operates 7 time flash 2 5 seconds OFF perature protection 122 F 50 C or less for 20 minutes Low discharge tem Temperature of discharge temperature thermistor has been Refer to 10 5 Check of LEV Check refrigerant circuit and refrig erant amount 8 time flash 2 5 seconds OFF MUZ FE12NA1 MUZ FE09 12NA MUZ FE09 12NAH PAM protection PAM Pulse Ampli tude Modulation PAM stops and restarts The overcurrent flows into IGBT Insulated Gate Bipolar tran sistor TR821 or the bus bar voltage reaches 320 V or more MUZ FE18NA Zero cross detect ing circuit Zero cross signal for PAM control cannot be detected This is not malfunction PAM protec tion will be activated in the following cases 1 Instantaneous power voltage drop Short time power failure 2 When the power supply voltage is high 9 time flash 2 5 seconds OFF mode starts 10 4 TROUBLE CRITERION OF MAIN PARTS MUZ FEO9NA MUZ FEO9NAH MUZ FE12NA MUZ FE12NA1 MUZ FE12NAH MUZ FE18NA Part name Check method and criterion Inverter check mode The connector of compressor is disconnected inverter check Check if the connector of the com pressor is correctly connected Refer to 10 5 How to check inverter compressor Defrost thermistor RT61 Ambient temperature thermistor RT65 Outdoor heat ex changer temperature
15. MITSUBISHI Revision F The descriptions of the expansion valve ELECTRIC coil have been corrected 10 4 Some descriptions have been modified SPLIT TYPE AIR CONDITIONERS Please void OBH543 REVISED EDITION E OUTDOOR UNIT No OBH543 utilized REVISED EDITION F SERVICE MANUAL Models MUZ FE09NA MUZ FEOONA MUZ FEO9NAH MUZ FE12NA MUZ FE12NA1 MUZ FE12NAH Indoor unit service manual MUZ FE18NA MSZ FE NA Series OBH542 CONTENTS 1 TECHNICAL CHANGES 2 2 PART NAMES AND FUNCTIONS 3 S SBECIFICATION seein E 4 4 OUTLINES AND DIMENSIONS mm68 8 6 5 WIRING DIAGRAM 7 6 REFRIGERANT SYSTEM DIAGRAM 77 9 ADY APN MU PUE UU EE 11 8 ACTUATOR CONTROL ne 18 9 SERVICE FUNCTIONS 19 10 TROUBLESHOOTING 19 MUZ FEO9NA MUZ FEO9NAH 11 DISASSEMBLY INSTRUCTIONS 38 MUZ FE12NA MUZ FE12NAH MUZ FEO09NA amp MUZ FE12NA1 TM NOTE RoHS compliant products have G mark on If the spec name plate e PARTS CATALOG OBB543 Use the specified 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 ou
16. 0 50 100 150 Hz 0 50 100 150 Hz The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor operational frequency of compressor MUZ FE12NA MUZ FE12NA1 MUZ FE12NAH Correction of Cooling capacity Correction of Cooling total input Correction of Heating capacity Correction of Heating total input 1 5 1 5 1 5 25 o 5 o e 2 9 Oo S 1 0 S 10 5 1 0 5 c 5 c 3 9 5 S 2 3 9 fa Zos 8 o5 Zos 9 gt 8 a 8 a c xx 150 Hz _ 0 50 100 150 Hz 0 50 100 150 Hz 0 50 100 150 Hz The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor Correction of Cooling capacity Correction of Cooling total input Correction of Heating capacity Correction of Heating total input 1 5 1 5 2 0 o 2 p g 2 5 5 5 5 815 6 1 0 S 5 1 0 S 5 c 3 c 8 5 5 g 51 0 9 D E 5 Zos 8 205 9 5 2 20 5 c oO 150 Hz 0 50 100 150 Hz 0 50 100 150 Hz 0 50 100 150 Hz The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor 7 6 HOW TO OPERATE FIXED FREQUENCY OPERATION Test run operation Press EMERGENCY OPERATION switch to start COOL or HEAT mode COOL Pres
17. 19 1 1 46 21 6 1 54 65 17 0 1 27 19 8 1 42 222 1 50 NOTE 1 IDB Intake air dry bulb temperature TC Total Capacity x10 Btu h TPC Total Power Consumption kW 2 Above data is for heating operation without any frost How to operate with fixed operational frequency of the compressor 1 Press the EMERGENCY OPERATION switch on the front of the indoor unit and select either EMERGENCY COOL mode or EMERGENCY HEAT mode before starting to operate the air conditioner The compressor starts with operational frequency The fan speed of the indoor unit is High This operation continues for 30 minutes In order to release this operation press the EMERGENCY OPERATION switch twice or once or press any button on the remote controller OBH543F E 7 2 PERFORMANCE CURVE Cooling Cooling capacity at Rated frequency 1 5 A Indoor intake air Wet bulb temperature F N difference F Capacity correction factors Indoor air Wet bulb temperature 76 75 N72 N68 64 14 23 32 4 50 59 68 77 86 95 104 113 Outdoor intake air DB temperature F MUZ FE09NA MUZ FEO9NAH SHF at rating condition 0 76 Airflow 307 CFM
18. F MUZ FE09NA MUZ FE12NA MUZ FE12NA1 Airflow 381 CFM Total power consumption kw 15 5 5 15 25 35 45 55 65 Outdoor intake air WB temperature F MUZ FE09NAH Airflow 381 CFM Total power consumption kW 15 5 5 15 25 35 45 55 65 Outdoor intake air WB temperature F MUZ FE18NA Airflow 738 CFM A 65 14 2 o 8 2 1 0 gem 2 aoe 8 06 eoe 15 5 5 15 25 35 45 55 65 Outdoor intake air WB temperature F This value of frequency is not the same as the actual frequency in operating Refer to 7 5 and 7 6 for the relationships between frequency and capacity OBH543F Airflow 420 CFM Total power consumption kW 15 5 5 15 25 35 45 55 65 Outdoor intake air WB temperature F MUZ FE12NAH Airflow 420 CFM 1 2 75 70 65 e Q2 e o o M ee 0 4 d Total power consumption KW 15 5 5 15 25 35 45 55 65 Outdoor intake air WB temperature F 13 7 3 CONDENSING PRESSURE Cooling Data is based on the condition of indoor humidity 50 Air flow should be set to High speed MUZ FEO9NA MUZ FEO9NAH PSIG 580 540 500 460 420 380 Condensing pressure 340 300 260 NENO000
19. thermistor RT68 Measure the resistance with a tester Refer to 10 6 Test point diagram and voltage 1 Inverter P C board for the chart of thermistor Discharge tem perature thermistor RT62 Fin temperature Measure the resistance with a tester Before measurement hold the thermistor with your hands to warm it up Refer to 10 6 Test point diagram and voltage 1 Inverter P C board for the chart of thermistor Measure the resistance between terminals using a tester Winding temperature 4 104 F 20 40 C Normal MUZ FEO9NA MUZ FE12NA1 MUZ FE09 12NAH 0 78 1 11 0 MUZ FE09 12NA MUZ FE18NA 1 52 2 17 0 0 83 1 18 O Outdoor fan motor OBH543F Measure the resistance between lead wires using a tester Part temperature 4 104 F 20 40 C Color of lead wire RED BLK BLK WHT WHT RED Normal 11 160 24 Part name Check method and criterion V coil 2154 Measure the resistance using a tester Part temperature 14 104 F 10 40 C Normal 0 97 1 38 Expansion valve coil LEV 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 WHT RED RED ORN YLW BRN BRN BLU Measure the resistance using a tester Part temperature 14 104 F
20. MUZ FE12NAH Units inch 4 way valve Refrigerant pipe 53 8 with heat insulator Flared connection Outdoor heat exchanger temperature thermistor RT68 Stop valve with service EON Discharge temperature ll thermistor Ambient temperature thermistor RT65 Defrost thermistor RT61 Capillary tube O D 0 118 x I D 0 071 x 23 5 8 93 0 x 21 8 x 600 Strainer Flared connection Expansion 100 Stop valve valve with strainer R V coil heating ON cooling OFF Capillary tube Refrigerant pipe 21 4 O D 0 118 x I D 0 079x 9 7 16 with heat insulator 93 0 2 0 x 240 Refrigerant flow in cooling gt Refrigerant flow in heating MUZ FE18NA Muffler Refrigerant pipe 25 8 with heat insulator Flared connection Stop valve with service port Discharge temperature pulled thermistor Defrost temperature thermistor RT65 RT61 Outdoor heat exchanger temperature thermistor RT68 Flared connection mcs Strainer 100 R V coil heating ON cooling OFF Stop valve Capillary tube O D 0 157 0 094x 3 15 16 Refrigerant pipe 23 8 84 0x92 4x100 Refrigerant flow in cooling with heat insulator Refrigerant flow in heating OBH543F MAX REFRIGERANT PIPING LENGTH and MAX HEIGHT DIFFERENCE Refrigerant piping ft Piping size O D in Model Max
21. Measure the voltage by analog type tester 3 During this check LED of the inverter P C board flashes 9 times Refer to 10 6 1 Check of compressor Refer to 10 5 O Check of compressor winding No Replace the compressor Is the compressor normal ie Refer to 10 5 Check of compressor operation time Does the compressor operate continuously Yes No Refer to 10 5 Check of compressor start failure OBH543F a Check of compressor winding e Disconnect the connector between the compressor and intelligent power module and measure the resistance between the compressor terminals lt lt Measurement point gt gt At 3 points BLK WHT BLK RED Measure the resistance between the lead wires at 3 points WHT RED lt lt Judgement gt gt Refer to 10 4 0 0 eeen Abnormal short Infinite D Abnormal open NOTE Be sure to zero the ohmmeter before measurement E Check of compressor operation time e Connect the compressor and activate the inverter Then measure the time until the inverter stops due to over current Operation method Start heating or cooling operation by pressing EMERGENCY OPERATION switch on the indoor unit TEST RUN OPERATION Refer to 7 6 lt lt Measurement gt gt Measure the time from the start of compressor to the stop of compressor due to overcurre
22. OFF tin heer e e lt gt add gt gt gt a E No beep No beep i Beeps h Repeated cycle Repeated cycle Repeated cycle OBH543F 3 Outdoor unit failure mode table Abnormal point Failure mode protection LED indication Outdoor P C board Condition Indoor outdoor unit failure mode recall function Outdoor unit failure mode recall function None Normal Outdoor power system Overcurrent cut out operates 3 consecutive times within 1 minute after the compressor gets started Reconnect connectors Refer to 10 5 How to check inverter compressor Check stop valve Discharge temperature thermistor Defrost thermistor 1 time flash every 2 5 seconds Fin temperature thermistor 3 time flash 2 5 seconds OFF P C board temperature thermistor 4 time flash 2 5 seconds OFF Ambient temperature thermistor 2 time flash 2 5 seconds OFF Thermistor shorts or opens during compressor running Refer to 10 5 Check of outdoor thermistors Defective outdoor thermistors can be identified by checking the blinking pattern of LED Overcurrent 11 time flash 2 5 seconds OFF Large current flows into intelligent power module Reconnect compressor connector Refer to 10 5 How to check inverter compressor Check stop valve Compressor synchronous up failure protection abnormal
23. and discharge temperature ther mistor CN643 Ambient temperature thermistor CN644 Outdoor heat exchanger temperature thermistor 3 Pull out the discharge temperature thermistor from its hold er Photo 6 4 Pull out the defrost thermistor from its holder 5 Pull out the outdoor heat exchanger temperature thermistor from its holder 6 Pull out the ambient temperature thermistor from its holder Removing outdoor fan motor 1 Remove the cabinet and panels Refer to 1 2 Disconnect the connectors for outdoor fan motor 3 Remove the propeller nut 4 Remove the propeller 5 Remove the screws fixing the fan motor 6 Remove the fan motor Removing the compressor and 4 way valve 1 Remove the cabinet and panels Refer to 1 2 Remove the inverter assembly Refer to 2 3 Recover gas from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 PSIG 4 Detach the brazed part of the suction and the discharge pipes connected with compressor 5 Remove the nuts of compressor legs 6 Remove the compressor 7 Detach the brazed part of pipes connected with 4 way valve OBH543F i Photo 7 Outdoor heat exchanger tempera ture thermistor Propeller Photo 9 Brazed parts of 4 way valve 11 2 MUZ FE18NA NOTE Turn OFF power supply before disassembly OPERATING PROCEDURE PHOTOS 1 Removing the cabinet Photo 1 1 Remove the screws
24. minutes Refer to 10 5 How to check miswiring and serial signal error 11 time flash 2 5 seconds OFF Stop valve Closed valve Closed valve is detected by compressor current Check stop valve 14 time flash 2 5 seconds OFF Outdoor unit Other abnormality Outdoor unit is defective Refer to 10 2 2 Flow chart of the detailed outdoor unit failure mode recall function Outdoor unit stops and restarts 3 min utes later is repeated 2 time flash 2 5 seconds OFF Overcurrent protec tion Large current flows into intelligent power module MUZ FE09 12NA MUZ FE12NA1 MUZ FE09 12NAH X When overcurrent protection occurs within 10 seconds after compressor starts compressor restarts after 15 seconds Reconnect connector of compres sor Refer to 10 5 How to check in verter compressor Check stop valve 3 time flash 2 5 seconds OFF Discharge tempera ture overheat protec tion Temperature of discharge temperature thermistor exceeds 241 F 116 C compressor stops Compressor can restart if discharge temperature thermistor reads 212 F 100 C or less 3 minutes later Check refrigerant circuit and refrig erant amount Refer to 10 5 Check of LEV 4 time flash 2 5 seconds OFF Fin temperature P C board tem perature thermistor overheat protection Temperature of fin temperature thermistor on the heat sink exceeds 167 176 F 75 80 C
25. or temperature of P C board temperature thermistor on the inverter P C board exceeds 158 167 F 70 75 C eCheck around outdoor unit Check outdoor unit air passage Refer to 10 5 Check of outdoor fan motor 5 time flash 2 5 seconds OFF High pressure pro tection Temperature of indoor coil thermistor exceeds 158 F 70 C in HEAT mode Temperature of outdoor heat exchanger tempera ture thermistor exceeds 158 F 70 C in COOL mode Check refrigerant circuit and refrig erant amount Check stop valve 8 time flash 2 5 seconds OFF Compressor syn chronous abnormal ity The waveform of compressor current is distorted Reconnect connector of compres Sor Refer to 10 5 How to check in verter compressor 10 time flash 2 5 seconds OFF Outdoor fan motor Outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start up Refer to 10 5 0 Check of outdoor fan motor Refer to 10 5 Check of inverter P C board 12 time flash 2 5 seconds OFF Each phase current of compressor Each phase current of compressor cannot be detected nor mally Refer to 10 5 How to check in verter compressor 13 time flash 2 5 seconds OFF DC voltage DC voltage of inverter cannot be detected normally Refer to 10 5 How to check in verter compressor Outdoor unit operates NOTE 1 The location of LED is illustrated at the r
26. the cabinet Photo 1 1 Remove the screw fixing the service panel 2 Pull down the service panel and remove it 3 Remove the screws fixing the conduit cover 4 Remove the conduit cover 5 Disconnect the power supply wire and indoor outdoor connecting wire 6 Remove the screws fixing the top panel 7 Remove the top panel 8 Remove the screws fixing the cabinet 9 Remove the cabinet 10 Remove the screws fixing the back panel 11 Remove the back panel Photo 2 Screws of the terminal block support and the back panel Screw of the cabinet Screw of the service panel Direction to remove Screws of the cabinet OBH543F Screws of the top Screws of the cabinet Photo 3 Conduit cover Screws of the top panel Screws of the 7 back panel Service panel Li Screws of the conduit cover _ Conduit plate OPERATING PROCEDURE PHOTOS 2 Removing the inverter assembly inverter P C board 1 Remove the cabinet and panels Refer to 1 2 Disconnect the lead wire to the reactor and the following connectors lt Inverter P C board gt CN641 Defrost thermistor and discharge temperature ther mistor CN643 Ambient temperature thermistor CN644 Outdoor heat exchanger temperature thermistor CN721 R V coil CN724 LEV CN932 Fan motor 3 Remove the compressor connector CN61 4 Remove the screws fixing the heat sink support and the se
27. 10 40 C MUZ FE18NA Color of lead wire Normal RED ORN RED WHT RED BLU RED YLW 37 540 Defrost heater MUZ FE NAH OBH543F Measure the resistance using a tester Part temperature 14 104 F 10 40 C Normal 349 428 25 10 5 TROUBLESHOOTING FLOW How to check inverter compressor Disconnect the connector between Scien and the intelligent power module IPM m Y Check the voltage between terminals fre See 10 5 Check of open phase y Are the voltages balanced No Replace the inverter P C board Yes Check the compressor freee See 10 5 Check of compressor B Check of open phase e With the connector between the compressor and the intelligent power module disconnected activate the inverter and check if the inverter is normal by measuring the voltage balance between the terminals Output voltage is 50 130 V The voltage may differ according to the tester lt lt Operation method gt gt Start cooling or heating operation by pressing EMERGENCY OPERATION switch on the indoor unit TEST RUN OPERA TION Refer to 7 6 lt lt Measurement point gt gt at 3 points BLK U WHT V Measure AC voltage between the lead wires at 3 points BLK U RED W WHT V RED W NOTE 1 Output voltage varies according to power supply voltage 2
28. 22 0 40 FV50S Refrigerant control Linear expansion valve Sound level 1 Cooling dB A 48 55 Heating dB A 49 55 Defrost method Reverse cycle Dimensions W 31 1 2 33 1 16 D 11 1 4 13 H 21 5 8 34 5 8 Weight 80 119 External finish Munsell 3Y 7 8 1 1 Remote controller Wireless type Control voltage by built in transformer 12 24 Refrigerant piping Not supplied Liquid Gas Indoor Outdoor Between the indoor Height difference amp outdoor units Piping length Refrigerant charge R410A NOTE Test conditions are based on AHRI 210 240 3 amp 1 Rating conditions Cooling Indoor 80 FDB 67 FWB Outdoor 95 FDB 75 FWB Heating Indoor 70 FDB 60 FWB Outdoor 47 FDB 43 FWB Heating Indoor 70 FDB 60 FWB Outdoor 17 FDB 15 FWB 1 4 0 0315 3 8 0 0315 Flared Flared 40 65 2 Ib 9 oz 3 8 0 0315 5 8 0 0315 Flared Flared 50 100 4 Ib 3 oz Refrigerant pipe size Min wall thickness Connection method 2 54 i Test condition KTA Indoor air condition F Outdoor air condition F Dry bulb Wet bulb Dry bulb Wet bulb Test A 2 Cooling Steady State at rated compressor Speed B 2 Cooling Steady State at rated compressor Speed 80 67 95 75 80 67 82 65 SEER B 1 C
29. 55 60 6570 F Outdoor ambient temperature Outdoor ambient temperature MUZ FE18NA PSIG PSIG 480 240 460 220 75 440 75 200 10 420 70 180 5 400 65 160 8 3 8 380 140 360 amp 120 2 340 S 100 8 320 tH 2 9 e 8 300 ge 60 Indoor DB temperature e vw 58Hz 280 i 40 58Hz 260 20 240 0 15 10 5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 F Outdoor ambient temperature OBH543F 15 10 5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 F Outdoor ambient temperature 15 STANDARD OPERATION DATA MSZ FE09NA MSZ FE12NA MSZ FE18NA Cooling Heating Cooling Heating Cooling Heating Capacity 9 000 10 900 12 000 13 600 18 000 21 600 SHF 0 76 0 73 0 84 Input 0 580 0 710 0 930 0 950 1 800 2 200 Rated frequency 34 42 51 52 5 50 5 62 5 Electrical circuit Indoor unit MSZ FE09NA MSZ FE12NA MSZ FE18NA Power supply 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 FEO9NAH MUZ FE12NA MUZ FE12NA1 MUZ FE12NAH MUZ FE18NA Power supply 208 230 1 60 Input 0 562 0 686 0 906 0 920 1 212 1 482
30. Coil frost prevention Indoor coil temperature thermistor Heating High pressure protection Cooling High pressure protection Heating Defrosting O O Defrost thermistor Fin temperature thermistor Protection Outdoor heat exchanger temperature thermistor High pressure protection Ambient temperature thermistor Low ambient temperature operation OBH543F m 9 SERVICE FUNCTIONS MUZ FEO9NA MUZ FEO9NAH MUZ FE12NA MUZ FE12NA1 MUZ FE12NAH MUZ FE18NA 9 1 CHANGE IN DEFROST SETTING Changing defrost finish temperature lt JS gt 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 Jumper MUZ FE09 12NA MUZ FE12NA1 MUZ FE18NA MUZ FE09 12NAH Soldered Initial setting 47 F 50 F 10 C 50 F 10 C 64 F 18 C 9 2 PRE HEAT CONTROL SETTING PRE HEAT CONTROL When moisture gets into the refrigerant cycle it may interfere the start up of the compressor at low outside temperature The pre heat control prevents this interference The pre heat control turns ON when outside temperature is 68 F 20 C or below When pre heat control is turned ON compressor is energized About 50 W lt JK gt To activate the pre heat control cut the JK wire of the inverter P C board Refer to 10 6 1 NOTE When the inverter P C board is
31. EMP THERMISTOR MUZ FEO9NA m MUZ FE12NA1 5 Le ak ak a eee BK BK Fr j 1 1 1 gt Hi jk 1 1 5 OPTION PARTS W mp Sr RED ETD ET DG be ELK MC U 1 1 CN61 IPM INVERTER P C BOARD 3 1 CN642 CN644 Dis CN641 C24 CN332 o Me 9l ifo ook If NOTES SIUE en NI ub 1 About the indoor side electric ys t e wiring refer to the indoor 3 RTG4 RT65 RT61 RT6 2 unit electric wiring diagram MF for servicing 2 Use copper conductors only For field wiring SYMBOL NAME SYMBOL NAME SYMBOL NAME C61 C62 C63 SMOOTHING CAPACITOR L61 REACTOR OUTDOOR HEAT EXCHANGER DB61 DB65 DIODE MODULE MC COMPRESSOR TEMP THERMISTOR F701 F801 F901 FUSE T3 15AL250V FAN MOTOR TB1 TB2 TERMINAL BLOCK H DEFROST HEATER OPT ION PARTS PTC64 PTC65 CIRCUIT PROTECTION TR821 SWITCHING POWER TRANSISTOR 1 802 POWER DEVICE RT61 DEFROST THERMISTOR T801 TRANSFORMER IPM IC832 POWER MODULE RTG2 DISCHARGE TEMP THERMISTOR X63 X64 X66 RELAY LED LED RT64 FIN TEMP THERMISTOR 2154 REVERSING VALVE COIL LEV EXPANSION VALVE COIL RT65 AMBIENT TEMP THERMISTOR 26H HEATER PROTECTORIOPTION PARTS OBH543F TBI ar T Donum WER e phase 60Hz UNIT From IN CONNECTING WIRE UNIT WIRES
32. EMP THERMISTOR 2154 REVERSING VALVE COIL LEV EXPANSION VALVE COIL RT65 AMBIENT TEMP THERMISTOR 26H HEATER PROTECTOR MUZ FE18NA POWER SUPPLY 208 230V 1 phase 60Hz CIRCUIT BREAKER 181 To Ion NT H 9 HF BLL CONNECTING WIRES 208 230V 1 phase gon 182 1 LED T801 F880 CERE eu gt lt INVERTER 0 4953 0 EC P C BOARD e NOUO leg C m CONNECTING WIRES 5 5 1 CN671 6 CN672 CN673 1 CN724 6 o C12 24V EE 2169 o 16 ole pooooo zo O 1 ml Hid pe En CONNECTING WIRE El 215477 e p 4 RT61 RT62 RT68 RT65 64 LEV NAME SYMBOL NAME NOTES 1 About the indoor side electric wiring refer to the indoor unit electric wirino diagram for servicing FUSE T3 15AL250V CIRCUIT PROTECTION e edu tore ead EINE FUSE T2AL250V DEFROST THERMISTOR DISCHARGE TEMP THERMISTOR FIN TEMP THERMISTOR AMBIENT TEMP THERMISTOR INTELLIGENT POMER MODULE TEMP THERMISTOR REACTOR TE TERMINAL BLOCK MF FAN MOTOR X64 RELAY PFC POWER FACTOR CONTROLLER 2 154 REVERSING VALVE SOLENOID COIL OBH543F i IC93 2 INTELLIGENT POWER MODULE OUTDOOR HEAT EXCHANGER IPM L 6 REFRIGERANT SYSTEM DIAGRAM MUZ FEO9NA MUZ FEO9NAH MUZ FE12NA MUZ FE12NA1
33. Length Max Height difference A B Liquid MUZ FEO9NA MUZ FEO9NAH MUZ FE12NA MUZ FE12NA1 MUZ FE12NAH MUZ FE18NA Max Height difference B Max Length A Outdoor unit ADDITIONAL REFRIGERANT CHARGE R410A oz NOTE Refrigerant piping exceeding 25 ft requires additional refrigerant charge according to the calculation Refrigerant piping length one way ft 30 40 50 60 Model Outdoor unit precharged MUZ FEO9NA MUZ FEO9NAH MUZ FE12NA 1 62 4 86 8 10 MUZ FE12NA1 MUZ FE12NAH Calculation X oz 1 62 5 oz ft x Refrigerant piping length ft 25 NOTE Refrigerant piping exceeding 33 ft requires additional refrigerant charge according to the calculation Outdoor unit Refrigerant piping length one way ft precharged 50 80 MUZ FE18NA 4 Ib 3 oz 10 06 F 27 82 Calculation X oz 2 96 5 oz ft x Refrigerant piping length ft 33 Model OBH543F 7 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 85 95 105 SHC TPC TC SHC TPC TC SHC 71 6 5 0 63 9 7 6 1 0 68 9 0 5 6 67 3 74 0 60 9 0 68 0 655 84 64 63 8 1 0 58 8 5 7 6 062 77 69 71 8 2 0 94 12 9 7 7 1 01 12 0 7 2 67 9 5
34. al pins of the connector although no signal is being transmitted to R V coil Check if CN721 MUZ FE09 12NA MUZ FE12NA1 MUZ FE09 12NAH CN602 MUZ FE18NA is connected Unit operates COOL mode even if it is set to HEAT mode cecal ghee Is there 208 230 VAC between CN721 MUZ 9 FE09 12NA MUZ FE12NA1 MUZ FEO9 dend 12NAH CN602 MUZ FE18NA and on Replace the inverter Bies PER GENE OERS TGN the inverter P C board 3 minutes after the No board switch twice HEAT mode power SUPPIY ONT Yes Replace the 4 way valve Unit operates HEAT mode even if it is set to COOL mode Disconnect connector between the compressor and the intelligent Is there 208 230 VAC between CN721 MUZ FE09 12NA MUZ FE12NA1 MUZ FE09 UON e arem ad 12NAHYCNG02 MUZ FET8NA Dani Gv peace the inverter press EMERGENCY OPERATION on the inverter P C board 3 minutes after the Eis switch once COOL mode power supply is turned ON No Replace the 4 way valve OBH543F e D Check of outdoor fan motor Disconnect CN932 from the inverter P C board an measure the resistance of the outdoor fan motor Is the outdoor fan motor normal Refer to 10 4 Yes MUZ FE09NA MUZ FEO9NAH MUZ FE12NA MUZ FE12NA1 MUZ FE12NAH No Replace the outdoor fan motor Replace the inverter P C board MUZ FE18NA
35. b ams he ele PE iL Nr zi uo d uh ij O ae ie CAT NENDE Ld aS ZUM per VE Dl 8 EEZ Pe Y E w au L TEE 3 p ER 8 9 Danes o m el iilis Oya E 20602 od L v 5 2 LED LEV Jumper wire for Jumper wire S ait e2 5 Base connector changing defrost for pre heat od 5n g EY Oq CN724 setting JS control setting o9 225 25 a8 99 ge JK Front side of unit gt Z Gc Ey cz EL SO seg SF 5 FS EE ot coz 005 Le 85 55 28 1 20 252 Se Bgc 59 5950 LEL OF 924 E at Qc SEO 5 89 96 252 2 TET os asc as Defrost thermistor RT61 Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT68 Resistance kQ Resistance kQ 0 4 14 32 50 68 Temperature F OBH543F Pe 15 temperature thermistor RT62 0 32 60 68 86 104 122 140 158 176 194 212 230 248 Temperature F 36 Fin temperature thermistor RT64 0 32 50 68 86 104122 140 158 176 Temperature F MUZ FE18NA Signal of out door fan motor CN931 LED Output to drive outdoor fan motor CN932 Fuse F901 T3 15AL250V all Fuse F880 T3 15AL250V Fuse F62 Fuse F601 R V coil CN602 T2 0AL250V 13 15AL250V 208 230 VAC Jumper wire for changing defrost setting JS
36. ck at least two consecutive blinking cycles 2 Releasing the failure mode recall function Release the failure mode recall function by the following procedures Turn OFF the power supply and turn it ON again Release the failure mode recall function accord Press RESET button of the remote controller ing to the left mentioned procedure Y Repair the failure parts Deleting the memorized abnormal condition After repairing the unit recall the failure mode again according to Setting up the failure mode recall function 10 2 1 Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted Release the failure mode recall function according to Releasing the failure mode recall function men tioned above NOTE 1 Make sure to release the failure mode recall function after it is set up otherwise the unit cannot operate properly 2 If the abnormal condition is not deleted from the memory the last abnormal condition is kept memorized X2 Blinking pattern when outdoor unit is abnormal Mr Blinking at 0 5 Blinking at 0 5 2 5 second OFF 3 second ON second interval 2 5 second OFF 3 second ON second interval gt lt gt lt lt gt lt gt lt ge
37. connector and terminal are connected properly 3 When the electronic control P C board seems to be defective check the copper foil pattern for disconnection and the components for bursting and discoloration 4 Refer to 10 2 and 10 3 OBH543F 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 SAN POTRAGA MSZ FE09NA MSZ FE18NA 1 Flow chart of failure mode recall function for the indoor outdoor unit MSZ FE12NA Operational procedure The cause of abnormality cannot be found because the abnormality does not recur Setting up the failure mode recall function Turn ON the power supply lt Preparation of the remote controller gt 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 two buttons for another 3 seconds Make sure that the indicators on the LCD screen shown in the right figure are all displayed Then release the buttons y Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit 31 Liu ELECTI
38. d up or flash Refer No board Refer to 10 6 1 o 10 6 1 E es p 260 325VDC Check the electric parts in main circuit If light up OK If flash refer to 10 3 OF Inverter P C board Solder side OBH543F ze MUZ FE18NA Disconnect the connector between compressor and intelligent power module Turn ON power supply and press EMERGENCY OPERATION switch Rectify indoor outdoor connecting wire Yes Does the upper lamp of Is there voltage 208 230 VAC Replace the indoor OPERATION INDICATOR on the between the indoor terminal No electronic control P C indoor unit light up block S1 and S2 board yes Is there bus bar voltage 294 370 VDC between JP715 and JP30 ned Replace the inverter on the inverter P C board Yes to 10 55 up or flash Refer No P C board Refer to 10 6 1 lic ka Check the electric parts in main circuit If LED lights up it is OK If LED flashes refer to 10 3 JP30 JP715 294 370 VDC OBH543F MSZ FE09NA MSZ FE18NA K Check of LEV Expansion valve MSZ FE12NA Turn ON the power supply N lt Preparation of the remote controller gt 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 two buttons for another 3 sec o
39. door terminal block S2 and S3 x1 y Turn ON the power supply y X1 Miswiring may damage indoor electronic control P C board during the operation Be sure to confirm the wiring is correct before the opera tion starts X3 Be sure to check this within 3 minutes after turning ON After 3 minutes LED blinks 6 times Even when the inverter P C board or the outdoor electronic control P C board is normal LED blinks 6 times after 3 minutes Is the bus bar voltage of the inverter P C board normal Refer to TEST POINT DIAGRAM AND VOLTAGE in this manual No Yes y Does the LED on the inverter P C board repeat 3 6 second OFF and 0 8 second ON quick blinking 3 No Repl ce theinyerter P C board Y Lighted es or not X2 Be careful of the residual voltage of smoothing Y lighted capacitor Turn OFF the power supply Remove the bridge between outdoor terminal block S2 and S3 A Turn OFF inverter controlled lighting equipment Turn OFF the power supply and then turn ON again Press EMERGENCY OPERATION Switch Reinstall either the unit or the light away from each other Attach a filter on remote control receiv ing section Is serial signal error indicated 6 minutes later of the indoor unit OBH543F Replace the indoor electronic control P C board 34 Electromagnetic
40. ed valve is detected by compressor current eCheck stop valve NOTE Blinking patterns of this mode differ from the ones of Troubleshooting check table 10 3 OPERATION INDICATOR POWER lamp MSZ FE09 12NA Upper lamp MSZ FE18NA OBH543F 22 10 3 TROUBLESHOOTING CHECK TABLE Symptom LED indication Abnormal point Condition Condition Remedy Outdoor unit does not oper ate 1 time flash every 2 5 seconds Outdoor power sys tem Overcurrent cut out operates 3 consecutive times within 1 minute after the compressor gets started or failure of restart of compressor has repeated 24 times Reconnect connector of compres sor Refer to 10 5 How to check in verter compressor Check stop valve Outdoor thermistors Discharge temperature thermistor fin temperature thermistor defrost thermistor outdoor heat exchanger temperature ther mistor P C board temperature thermistor or ambient tempera ture thermistor shorts or opens during compressor running Refer to 10 5 Check of outdoor thermistors Outdoor control sys tem Nonvolatile memory data cannot be read properly POWER lamp MSZ FE09 12NA the upper lamp of OPERA TION INDICATOR lamp MSZ FE18NA of the indoor unit lights up or flashes 7 times Replace inverter P C board 6 time flash 2 5 seconds OFF Serial signal The communication fails between the indoor and outdoor unit for 3
41. erter P C board Yes Check the connection of the connectors CN931 CN932 of the outdoor fan motor If the connection is poor make it correct x Only for MUZ FE18NA lt the fuse F901 blown on the in Operate the outdoor unit by starting EMERGENCY OPERATION Check the LED indication on the in Check the remedy following LED verter P C board No indication Does the LED flash 10 times Refer to 10 3 Yes 10 time flash Replace the inverter P C board E OBH543F 5 How to check miswiring and serial signal error Turn OFF the power supply Y Is there rated voltage in the power supply Y Yes Turn ON the power supply Y No Check the power supply Is there rated voltage between outdoor terminal block S1 and S2 yres Press EMERGENCY OPERATION switch once up lt Confirmation of the power to the indoor unit gt Y e the OPERATION INDICATOR lamp light Yes Y Is serial signal error indicated 6 minutes later Yes lt No No Check the wiring Is there any miswiring poor contact or wire No disconnection of the indoor outdoor connect ing wire Yes Correct them No y A y Turn OFF the power supply Check once more if the indoor outdoor connecting wire is not miswiring Bridge the out
42. ight figure Refer to 10 6 1 1 time flash 2 5 seconds OFF Frequency drop by current protection Current from power outlet is nearing Max fuse size 3 time flash 2 5 seconds OFF Frequency drop by high pressure pro tection Temperature of indoor coil thermistor exceeds 131 F 55 C in HEAT mode compressor frequency lowers Frequency drop by defrosting in COOL mode Indoor coil thermistor reads 46 F 8 C or less in COOL mode compressor frequency lowers The unit is normal but check the following Check if indoor filters are clogged Check if refrigerant is short Check if indoor outdoor unit air cir culation is short cycled 4 time flash 2 5 seconds OFF Frequency drop by discharge tempera ture protection 2 LED is lighted during normal operation The flashing frequency shows the number of times the LED blinks after every 2 5 second OFF Flashing Example When the flashing frequency is 2 OBH543F 0 5 second ON Temperature of discharge temperature thermistor exceeds 232 F 111 C compressor frequency lowers zal 0 5 second ON eCheck refrigerant circuit and refrig erant amount Refer to 10 5 Check of LEV Refer to 10 5 Check of outdoor thermistors Inverter P C board Parts side MUZ FE09 12NA LED MUZ FE12NA1 Flashing wi MUZ FE09 12NAH MUZ FE18NA LED 2 5 second OFF 23 Symptom LED indication
43. in hose i Air outlet Drain outlet OBH543F SPECIFICATION MUZ FEO9NA MUZ FEO9NAH MUZ FE12NA MUZ FE12NA1 MUZ FE12NAH MUZ FE18NA ed Minimum Maximum Cooling 1 9 000 2 800 9 000 12 000 2 800 12 000 18 000 8 200 25 200 Heating 47 31 10 900 3 000 18 000 13 600 3 000 21 000 21 600 7 500 29 700 Capacity Rated Maximum Heating 17 2 6 700 12 500 12NA 8 300 13 600 12NA1 7 900 13 600 11 700 21 600 Power consumption Rated Minimum Maximum Cooling 3 amp 1 580 160 650 930 160 960 1 270 570 2 280 Heating 47 31 710 150 2 250 950 150 2 250 1 540 520 2 420 Power consumption Rated Maximum Heating 17 2 650 1 730 12NA 800 1 780 12NA1 750 1 780 1 240 2 620 EER 1 SEER 3 Cooling 15 5 26 0 12 9 23 0 14 2 20 2 HSPF IV 44 Heating 10 0 12NA 10 6 12NA1 10 5 10 3 12NAH 10 1 COP Heating 1 4 50 4 20 4 11 Power supply V phase Hz 208 230 1 60 Max fuse size time delay A 15 20 Min circuit ampacity A 12 Fan motor 0 56 09 12 SNB130FQAH 09NA 09NAH 12NA1 12NAH SNB130FQBHT SNB172FQKMT R L A 8 6 12 9 L R A 10 8 16 1 Refrigeration oil L Model 0 45 NEO
44. ise TV sets radios FM AM broadcast shortwave 2 Channel frequency broadcast station affected by the electromagnetic noise 3 Channel frequency broadcast station unaffected by the electromagnetic noise 4 Layout of indoor outdoor unit of the air conditioner indoor outdoor wiring grounding wire antennas wiring from antennas receiver Electric field intensity of the broadcast station affected by the electromagnetic noise Presence or absence of amplifier such as booster Operation condition of air conditioner when the electromagnetic noise enters in 1 Turn OFF the power supply once and then turn ON the power supply In this situation check for the electromagnetic noise 2 Within 3 minutes after turning ON the power supply press OPERATE STOP ON OFF button on the remote controller for power ON and check for the electromagnetic noise 3 After a short time 3 minutes later after turning ON the outdoor unit starts running During operation check for the elec tromagnetic noise 4 Press OPERATE STOP ON OFF button on the remote controller for power OFF when the outdoor unit stops but the indoor outdoor communication still runs on In this situation check for the electromagnetic noise OBH543F 10 6 TEST POINT DIAGRAM AND VOLTAGE 1 Inverter P C board MUZ FEO9NA MUZ FEO9NAH MUZ FE12NA MUZ FE12NA1 MUZ FE12NAH
45. ity Compressor start 12 time flash 2 5 seconds OFF Waveform of compressor current is distorted eReconnect compressor connector Refer to 10 5 How to check inverter compressor Discharge temperature Temperature of discharge temperature thermistor exceeds 241 F 116 C compressor stops Compressor can restart if discharge temperature thermistor reads 212 F 100 C or less 3 minutes later eCheck refrigerant circuit and refrigerant amount Refer to 10 5 Check of LEV High pressure Temperature of indoor coil thermistor exceeds 158 F 70 C in HEAT mode Temperature of defrost thermistor exceeds 158 F 70 C in COOL mode eCheck refrigerant circuit and refrigerant amount eCheck stop valve Fin temperature P C board temperature 7 time flash 2 5 seconds OFF Temperature of fin temperature thermistor on the inverter P C board exceeds 167 176 F 75 80 C or temperature of P C board temperature thermistor on the inverter P C board exceeds 158 167 F 70 75 C eCheck around outdoor unit eCheck outdoor unit air passage Refer to 10 5 D Check of outdoor fan motor Outdoor fan motor Outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start up Refer to 10 5 D Check of outdoor fan motor Refer to 10 5 0 of inverter P C board Nonvolatile memory data 5 time flash 2 5 seconds OFF Nonvolatile memo
46. mistor Replace the thermistor except RT64 When RT64 is m mal R ls the thermistor non Ye efer to 10 6 1 No abnormal replace the inverter P C board Reconnect the connector of thermistor Turn ON the power supply and press EMERGENCY OPERATION switch Y Does the unit operate for 10 minutes or more without showing thermistor abnormality No Replace the inverter P C board yes OK Cause is poor contact MUZ FEO9NA MUZ FEO9NAH MUZ FE12NA MUZ FE12NA1 MUZ FE12NAH Thermistor Connector Pin No Defrost Between CN641 pin1 and pin2 Discharge temperature Between CN641 pin3 and pin4 Fin temperature Between CN642 pin1 and pin2 Inverter P C board Ambient temperature Between CN643 pin1 and pin2 Outdoor heat exchanger temperature Between CN644 pin1 and pin3 MUZ FE18NA Thermistor Connector Pin No Defrost Between CN671 pin1 and pin2 Discharge temperature Between CN671 pin3 and pin4 Fin temperature Between CN673 pin1 and pin2 Inverter P C board Ambient temperature Between CN672 pin1 and pin2 Outdoor heat exchanger temperature Between CN671 pind and pin6 B Check of R V coil x First of all measure the resistance of R V coil to check if the coil is defective Refer to 10 4 In case CN721 MUZ FE09 12NA MUZ FE12NA1 MUZ FE09 12NAH CN602 MUZ FE18NA is disconnected or R V coil is open voltage is generated between the termin
47. move the earth wires and the lead wires of the inverter P C board 7 Remove the screws of the PB support 8 Remove the inverter P C board from the relay panel 3 Removing R V coil 1 Remove the cabinet and panels Refer to 1 2 Disconnect the following connector lt Inverter P C board gt CN602 R V coil 3 Remove the R V coil Photo 4 Inverter P C board Screws of the PB support Photo 5 OBH543F Screw of the relay panel Screws of the Earth wires BE support Screws of the relay panel Screw of the R V coil B Brazed parts of 4 way valve OPERATING PROCEDURE PHOTOS 4 Removing the discharge temperature thermistor Photo 6 defrost thermistor outdoor heat exchanger tempera Outdoor heat Ambient tem ture thermistor and ambient temperature thermistor exchanger tempera perature 1 Remove the cabinet and panels Refer to 1 ture thermistor thermistor 2 Disconnect the lead wire to the reactor and the following connectors lt Inverter P C board gt CN671 Defrost thermistor discharge temperature thermis tor and outdoor heart exchanger temperature ther mistor CN672 Ambient temperature thermistor 3 Pull out the discharge temperature thermistor from its holder Photo 8 4 Pull out the defrost thermistor from its holder 5 Pull out the outdoor heat exchanger temperature thermistor from its holder 6 Pull out the ambient temperature thermistor from its h
48. n 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 400 380 360 340 5 320 300 5 280 2 5 260 5 240 g 8 220 200 180 160 140 Y me ae 58Hz 20 15 10 5 10 15 20 25 30 35 40 45 50 55 60 6570 F Outdoor ambient temperature MUZ FE12NA MUZ FE12NA1 MUZ FE12NAH DNN TO 40 15 10 5 10 15 20 25 30 35 40 45 50 55 60 6570 F Outdoor ambient temperature PSIG 400 75 380 70 360 89 340 S 320 A 2 300 wes 2 280 ex er 5 260 oe c o S 240 we 5 220 200 58Hz 180 160 140 120 40 15 10 5 10 15 20 25 30 35 40 45 50 55 60 6570 F 15 10 5 10 15 20 25 30 35 40 45 50
49. nds Make sure that the indicators on the LCD screen shown in the right figure are all displayed Then release the buttons Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit 1 x1 Regardless of normal or abnormal condition a short beep Y is emitted once the signal is received Expansion valve operates in full opening direction Y Do you hear the expansion valve click click 9 Do you feel the expansion valve vibrate Yes on touching it Ne Is LEV coil properly fixed to Properly fix the LEV coil to the expansion valve the expansion valve No Yes Measure each voltage between connector pins of CN724 on the inverter P C board 1 Pin Pin Does the resistance of LEV 2 Pin Pin coil have the characteristics Yes 3 Pin Pin Refer to 10 4 4 Pin No Is there about 3 5 VAC between each NOTE Measure the voltage by an analog tester Replace the LEV coil ester Replace the expansion valve NOTE After check of LEV do the undermentioned operations 1 Turn OFF the power supply and turn ON it again 2 Press RESET button on the remote controller OBH543F E D Check of inverter P C board Check the outdoor fan motor Refer to 10 5 0 v
50. ng at 0 5 2 5 second OFF 3 second ON second interval 2 5 second OFF 3 second ON second interval 4 gt lt gt lt gt d gt 6 gt amp gt r en OFF o ee gt lt p 7 No beep Beeps pa No beep pia Repeated cycle Repeated cycle Repeated cycle OBH543F 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 Y 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 COOL or TOO WARM button to adjust the set temperature to 77 F 25 C x1 x1 Regardless of normal or abnormal condition 2 short beeps are emitted as the signal is received Y Does POWER lamp MSZ FE09 12NA the up per lamp of OPERATION INDICATOR lamp MSZ FE18NA on the indoor unit blink at the interval of 0 5 seconds Blinks The outdoor unit is abnormal Beep is emitted N at the same timing as the blinking of POWER lamp MSZ FE09 12NA the upper lamp of OFF OPERATION INDICATOR lamp MSZ FE 18NA X2 Yes Blinks The outdoor unit is abnormal Check the blinking pattern and identify the abnormal point by referring to The outdoor unit is normal the outdoor unit failure mode table 10 2 3 Make sure to che
51. noise enters into TV sets or radios Is the unit grounded Ground the unit No Yes Is the distance between the antennas and the indoor unit within 9 91 ft or is the distance between the antennas and Yes the outdoor unit within 9 91 ft No Extend the distance between the antennas and the indoor unit and or the antennas and the outdoor unit sets or radios and the outdoor unit Yes radios and the outdoor unit ft or is the distance between the TV radios and the indoor unit or the TV sets or within 9 91 ft No Are the antennas damaged Is the coaxial cable damaged Replace or repair the antenna Is there any poor contact in the anten Yes Replace or repair the coaxial cable na wiring fe Is the indoor outdoor connecting wire Extend the distance between the indoor outdoor of the air conditioner and the wiring of connecting wire of the air conditioner and the wir the antennas close Yes ing of the antennas Is the distance between the TV sets or radios and the indoor unit within 3 28 Extend the distance between the TV sets and or Even if all of the above conditions are fulfilled the electromagnetic noise may enter depending on the electric field strength or the installation condition combination of specific conditions such as antennas or wiring Check the followings before asking for service 1 Devices affected by the electromagnetic no
52. nt Check of compressor start failure lt lt Judgement gt gt 0 second 1 second 2 seconds 10 seconds 10 minutes Confirm that 1 4 is normal Electrical circuit check 1 Contact of the compressor connector inverter P C board C 4 Voltage between outdoor terminal block 51 52 2 Output voltage of inverter P C board and balance of them See 10 5 3 Direct current voltage between DB61 and MUZ FE09 12NA MUZ FE12NA1 MUZ FE09 12NAH JP715 and JP30 MUZ FE18NA on the Does the compressor run for 10 seconds or Check the refrigerant circuit more after it starts Yes Check the stop valve d After the compressor is heated with a drier does the compressor start x1 No Replace the compressor Yes Compressor start failure Activate pre heat control Refer to 9 2 PRE HEAT CONTROL SETTING OBH543F Abnormal IPM failure Compressor winding short Abnormal Compressor lock out Starting defect Abnormal Abnormal Refrigerant circuit defect Closed valve Normal H x1 Heat the compressor with a drier for about 20 minutes Do not recover refrigerant gas while heating Heating part Check of outdoor thermistors Disconnect the connector of thermistor in the outdoor P C board see below table and measure the resistance of ther
53. 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 5 Remove the screws fixing the conduit cover 6 Remove the conduit cover 7 Remove the top panel 8 Remove the valve cover 9 Disconnect the power supply and indoor outdoor con necting wire 10 Remove the screws of the cabinet 11 Remove the cabinet 12 Remove the screws of the back panel 13 Remove the back panel Screws of the Photo 2 Screws of the back panel top panel Screws of the back panel Screws of 25 the back Ed Screws of the Screws of the cabinet cabinet Screws of the conduit cover 7 Conduit plate Screws of Screws the service of the panel cabinet M Screws of the Screws of Screw of back panel the back the valve panel cover OBH543F OPERATING PROCEDURE PHOTOS 2 Removing the inverter assembly inverter P C board 1 Remove the cabinet and panels Refer to 1 2 Disconnect the lead wire to the reactor and the following con nectors lt Inverter P C board gt CN602 R V coil CN671 Defrost thermistor discharge temperature thermistor and outdoor heat exchanger temperature thermistor CN672 Ambient temperature thermistor CN724 LEV CN931 CN932 Fan motor 3 Remove the compressor connector 4 Remove the screws fixing the relay panel 5 Remove the relay panel 6 Re
54. older Removing outdoor fan motor 1 Remove the top panel cabinet and service panel Refer to 1 2 Disconnect the following connectors lt Inverter P C board gt CN931 and CN932 Fan motor 3 Remove the propeller 4 Remove the screws fixing the fan motor 5 Remove the fan motor 1 Screws of the outdoor fan motor 6 Removing the compressor and 4 way valve Photo 8 1 Remove the top panel cabinet and service panel Refer to 1 Brazed part of the rare temperature 2 Remove the back panel Refer to 1 discharge pipe 3 Remove the inverter assembly Refer to 2 4 Recover gas from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 kg cm 0 MPa 5 Detach the brazed part of the suction and the discharge pipes connected with compressor 6 Remove the compressor nuts 7 Remove the compressor 8 Detach the brazed parts of 4 way valve and pipes Photo 5 Brazed part of the suction pipe OBH543F T9 MITSUBISHI ELECTRIC CORPORATION HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Copyright 2009 MITSUBISHI ELECTRIC CORPORATION Distributed in Jan 2015 No OBH543 REVISED EDITION F Distributed in Dec 2012 No OBH543 REVISED EDITION E Distributed in Apr 2012 No OBH543 REVISED EDITION D Distributed in Apr 2011 No OBH543 REVISED EDITION C Distributed in Apr 2011 No OBH543 REVISED EDITION B Dist
55. ooling Steady State Cooling at minimum compressor Speed 80 67 82 65 F 1 Cooling Steady State at minimum compressor Speed E V Cooling Steady State at Intermediate compressor Speed 5 H1 2 Heating Steady State at rated compressor Speed H3 2 Heating at rated compressor Speed HSPF HO 1 Heating Steady State Heating at minimum compressor Speed H1 1 Heating Steady State at minimum compressor Speed H2 V Heating at Intermediate compressor Speed 5 80 67 67 53 5 80 67 87 69 70 60 47 43 70 60 17 15 70 60 62 70 60 47 70 60 35 3 amp 5 At Intermediate compressor Speed Cooling rated compressor speed minimum compressor speed 3 minimum compressor speed OPERATING RANGE 1 POWER SUPPLY Rated voltage Guaranteed voltage V 208 230 V in 208 230 253 Outdoor unit 1 phase 60 Hz 2 OPERATION Intake air temperature F Condition Outdoor WB DB Standard temperature 67 95 Maximum temperature 73 115 Minimum temperature 57 14 Maximum humidity Standard temperature 60 47 Heating Maximum temperature 67 75 Minimum temperature 60 13 Cooling OBH543F 3 4 OUTLINES AND DIMENSIONS MUZ FEO9NA MUZ FEO9NAH MUZ FE12NA MUZ FE12NA1 MUZ FE12NAH REQUIRED SPACE Drain hole 1 5 8 FE09 12NA
56. parator 5 Remove the fixing screws of the terminal block support and the back panel 6 Remove the inverter assembly 7 Remove the screw of the ground wire and screw of the ter minal block support 8 Remove the heat sink support from the P C board support 9 Remove the screw of the inverter P C board and remove the inverter board from the board support 3 Removing R V coil 1 Remove the cabinet and panels Refer to 1 2 Disconnect the following connectors lt Inverter P C board gt CN721 R V coil 3 Remove the R V coil OBH543F ER Photo 4 Screws of the terminal block support and the back panel Screws of the heat sink support and the separator 111111 Photo 5 Inverter assembly Heat sink Inverter P C board Screw of the terminal block Hook of the board support P C board support Terminal block support Screw of the Heat sink support ground wire Hook of the P C board support Photo 6 Screw of the P C board fixture R V coil Discharge temperature thermistor OPERATING PROCEDURE PHOTOS 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 1 2 Disconnect the lead wire to the reactor and the following connectors lt Inverter P C board gt CN641 Defrost thermistor
57. r products We will not be held responsible for mechanical failure system malfunction unit breakdown or accidents caused by failure to follow the instructions Revision A MUZ FE18NA has been added Revision B e MUZ FE09NA and MUZ FE12NA1 have been added Revision C Specification has been corrected Capacity Rated gt Capacity Rated Maximum Power consumption Rated Power consumption Rated Maximum Revision D MUZ FE09NAH and MUZ FE12NAH have been added Revision E The formula for calculating the additional refrigerant charge has been corrected Revision F The descriptions of the expansion valve coil have been corrected 10 4 Some descriptions have been modified 1 TECHNICAL CHANGES MUZ FE09NA MUZ FE12NA MUZ FE18NA 1 New model MUZ FE09NA gt MUZ FEO9NA MUZ FE12NA gt MUZ FE12NA1 1 Compressor has been changed 2 Inverter P C board has been changed MUZ FEO9NA 7 gt MUZ FE09NAH MUZ FE12NA1 gt MUZ FE12NAH 1 Defrost heater has been added 2 Inverter P C board has been changed OBH543F lt 2 PART NAMES AND FUNCTIONS MUZ FEO9NA MUZ FEO9NAH MUZ FE12NA MUZ FE12NA1 MUZ FE12NAH Airinlet back and side Air outlet Drain outlet MUZ FE18NA Airinlet back and side Dra
58. replaced check the Jumper wires and cut solder them if necessary 10 TROUBLESHOOTING MUZ FEO9NA MUZ FEO9NAH MUZ FE12NA MUZ FE12NA1 MUZ FE12NAH MUZ FE18NA 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 2 Be sure to turn OFF the power supply before removing the front panel the cabinet the top panel and the electronic control P C board 3 When removing the electrical parts be careful of the residual voltage of smoothing capacitor 4 When removing the electronic control P C board hold the edge of the board with care NOT to apply stress on the components 5 When connecting or disconnecting the connectors hold the connector housing DO NOT pull the lead wires lt Incorrect gt lt Correct gt Lead wiring Connector housing 3 Troubleshooting procedure 1 Check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality To make sure check how many times the OPERATION INDICATOR lamp is flashing on and off before starting service work 2 Before servicing check that the
59. ributed in Sep 2010 No OBH543 REVISED EDITION A 5 Distributed in Jul 2009 No OBH543 5 New publication effective Jan 2015 Made in Japan Specifications are subject to change without notice
60. ry data cannot be read properly eReplace the inverter P C board MUZ FE18NA Power module 6 time flash 2 5 seconds OFF The interphase short circuit occurs in the output of the intelligent power module IPM The compressor winding shorts circuit Refer to 10 5 How to check inverter compressor 10 time flash 2 5 seconds OFF Discharge temperature Temperature of discharge temperature thermistor has been 122 F 50 C or less for 20 minutes Refer to 10 5 Check of LEV eCheck refrigerant circuit and refrigerant amount 11 time flash 2 5 seconds OFF DC voltage 8 time flash 2 5 seconds OFF DC voltage of inverter cannot be detected normally Each phase current of compressor 9 time flash 2 5 seconds OFF Each phase current of compressor cannot be detected normally Refer to 10 5 How to check inverter compressor 12 time flash 2 5 seconds OFF phase Overcurrent Compressor open 10 time flash 2 5 seconds OFF Large current flows into intelligent power module IPM The open phase operation of compressor is detected The interphase short circuit occurs in the output of the intelligent power module IPM The compressor winding shorts circuit eReconnect compressor connector Refer to 10 5 How to check inverter compressor 14 time flash 2 5 seconds OFF Stop valve Closed valve 14 time flash 2 5 seconds OFF Clos
61. s once HEAT Press twice Test run operation starts and continues to operate for 30 minutes Compressor operates at rated frequency in COOL mode or 58 Hz in HEAT mode Indoor fan operates at High speed After 30 minutes test run operation finishes and EMERGENCY OPERATION starts operation frequency of compressor var ies To cancel test run operation EMERGENCY OPERATION press EMERGENCY OPERATION switch or any button on remote controller aRWN o OBH543F ig 8 ACTUATOR CONTROL MUZ FEO9NA 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 5 seconds 15 seconds lt gt Compressor OFF ON ee OFF 8 2 R V COIL CONTROL OFF Heating EE Stet et ON Cooling Mea rad Oeste he OFF Dry oren OFF NOTE The 4 way valve reverses for 5 seconds right before start up of the compressor lt COOL gt lt HEAT gt 5 seconds 5 seconds ON MEN MEN Compressor Reo ON EE OFE o Outdoor fan ON e OFF motor 8 3 RELATION BETWEEN MAIN SENSOR AND ACTUATOR Actuator Outdoor fan motor Sensor Purpose R V coil Indoortan Discharge temperature thermistor Protection Cooling

MUZ-FE Service Manual

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