Mitsubishi Electric Mr.Slim MUZ-FE09NA Service Manual Download Page 44

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HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN

Distributed in Sep. 2010. No. OBH543 REVISED EDITION-A 5

Distributed in Jul. 2009. No. OBH543 5

Made in Japan

New publication, effective Sep. 2010
Specifications subject to change without notice.

Summary of Contents for Mr.Slim MUZ-FE09NA

Page 1: ...E FUNCTIONS 17 10 TROUBLESHOOTING 17 11 DISASSEMBLY INSTRUCTIONS 36 Models MUZ FE09NA MUZ FE12NA MUZ FE18NA SPLIT TYPE AIR CONDITIONERS OUTDOOR UNIT Indoor unit service manual MSZ FE NA Series OBH542 NOTE RoHS compliant products have G mark on the spec name plate TM HFC utilized R410A No OBH543 REVISED EDITION A PARTS CATALOG OBB543 Revision A MUZ FE18NA has been added Please void OBH543 MUZ FE09N...

Page 2: ... FE18NA 1 New model PART NAMES AND FUNCTIONS 2 MUZ FE09NA MUZ FE12NA Air outlet Drain outlet Piping Drain hose Air inlet back and side Revision A MUZ FE18NA has been added MUZ FE18NA Piping Air outlet Drain outlet Air inlet back and side Drain hose ...

Page 3: ...L A 8 6 12 9 L R A 10 8 16 1 Refrigeration oil L Model 0 45 NEO22 0 40 FV50S Refrigerant control Linear expansion valve Sound level 1 Cooling dB A 48 48 55 Heating dB A 49 49 55 Defrost method Reverse cycle Dimensions W in 31 1 2 33 1 16 D in 11 1 4 13 H in 21 5 8 34 5 8 Weight Ib 80 119 External finish Munsell 3Y 7 8 1 1 Remote controller Wireless type Control voltage by built in transformer VDC ...

Page 4: ...sor Speed 70 60 17 15 H0 1 Heating Steady State at minimum compressor Speed 70 60 62 56 5 H1 1 Heating Steady State at minimum compressor Speed 70 60 47 43 H2 V Heating at Intermediate compressor Speed 5 70 60 35 33 5 At Intermediate compressor Speed Cooling rated compressor speed minimum compressor speed 3 minimum compressor speed 3 4 2 OPERATION Mode Condition Intake air temperature F Indoor Out...

Page 5: ... more without any obstruction in front and on both sides of the unit 14 in or more 8 in or more 4 in or more 4 in or more Open two sides of left right or rear side MUZ FE18NA 16 7 16 1 9 16 1 5 8 Drain hole 6 7 8 19 11 16 13 2 Air in Air out 2 holes 13 32 13 16 14 3 16 33 1 16 4 5 16 3 3 16 34 5 8 17 25 32 Service panel 3 29 32 6 1 2 7 11 16 3 5 4 4 Liquid refrigerant pipe joint Refrigerant pipe f...

Page 6: ...6 5 WIRING DIAGRAM MUZ FE09NA MUZ FE12NA MUZ FE18NA ...

Page 7: ...uffler O D 0 118 I D 0 071 23 5 8 ø3 0 ø1 8 600 Capillary tube O D 0 118 I D 0 079 9 7 16 ø3 0 ø2 0 240 Outdoor heat exchanger temperature thermistor RT68 Muffler MUZ FE18NA Service port Service port Outdoor heat exchanger Flared connection Defrost thermistor RT61 Discharge temperature thermistor RT62 Flared connection Stop valve Stop valve with service port Capillary tube O D 0 157 I D 0 094 3 15...

Page 8: ...frigerant charge according to the calculation Model Outdoor unit precharged Refrigerant piping length one way ft 25 30 40 50 60 65 MUZ FE09NA MUZ FE12NA 2 lb 9 oz 0 1 62 4 86 8 10 11 34 12 96 Calculation X oz 1 08 5 oz ft Refrigerant piping length ft 25 NOTE Refrigerant piping exceeding 33 ft requires additional refrigerant charge according to the calculation Model Outdoor unit precharged Refriger...

Page 9: ...PACITY Model Indoor air Outdoor intake air WB temperature F IDB F 5 15 25 35 43 45 55 TC TPC TC TPC TC TPC TC TPC TC TPC TC TPC TC TPC MUZ FE09NA 75 4 8 0 44 6 3 0 56 7 9 0 66 9 4 0 73 10 6 0 77 11 0 0 78 12 4 0 81 70 5 2 0 42 6 7 0 54 8 2 0 64 9 6 0 71 10 9 0 75 11 2 0 77 12 7 0 80 65 5 5 0 41 6 9 0 52 8 6 0 62 10 0 0 69 11 2 0 73 11 6 0 74 13 0 0 78 MUZ FE12NA 75 6 0 0 58 7 9 0 73 9 9 0 86 11 8 ...

Page 10: ...F at rating condition 0 73 350 CFM Airflow 65 75 85 95 105 115 Outdoor intake air DB temperature F Total power consumption kW MUZ FE09NA MUZ FE12NA MUZ FE18NA Cooling capacity at Rated frequency 0 9 1 0 1 1 1 2 1 3 1 4 1 5 14 23 32 41 50 59 68 77 86 95 104 113 Outdoor intake air Dry bulb temperature F Capacity correction factors 76 75 68 64 72 Indoor intake air Wet bulb temperature F Indoor air We...

Page 11: ...NA MUZ FE18NA 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 Indoor air Dry bulb temperature difference F Outdoor intake air Wet bulb temperature F 4 5 14 23 32 41 50 59 0 4 0 5 0 6 0 7 0 8 0 9 1 0 1 1 1 2 1 3 Heating capacity at Rated frequency Capacity correction factor 59 68 79 Indoor intake ...

Page 12: ...ng pressure 86 80 75 70 68 70 75 80 85 90 95 100 105 F 120 125 130 135 140 145 150 155 160 165 170 175 180 Suction pressure Outdoor ambient temperature Indoor DB temperature F PSIG 86 80 75 70 68 70 75 80 85 90 95 100 105 F 260 300 340 380 420 460 500 540 580 Indoor DB temperature F Outdoor ambient temperature MUZ FE18NA PSIG Condensing pressure 86 80 75 70 70 75 80 85 90 95 100 105 F 110 120 130 ...

Page 13: ...G PSIG Condensing pressure Outdoor ambient temperature 20 25 30 5 10 15 35 40 45 50 55 60 6570 F 220 200 180 160 140 240 260 280 320 300 340 360 380 400 75 70 65 Suction pressure Outdoor ambient temperature 20 25 30 5 10 15 35 40 45 50 55 60 6570 F 80 70 60 50 90 100 110 120 130 140 150 160 170 120 10 15 15 10 40 Indoor DB temperature F Indoor DB temperature F 58Hz 58Hz MUZ FE18NA PSIG Condensing ...

Page 14: ...4 05 3 66 4 12 3 72 4 47 4 04 5 72 5 17 Fan motor current A 0 35 0 32 1 16 1 05 1 13 1 02 Refrigerant circuit Condensing pressure PSIG 376 355 402 392 373 357 Suction pressure PSIG 154 108 148 104 151 107 Discharge temperature F 142 145 160 158 150 159 Condensing temperature F 112 108 117 115 111 105 Suction temperature F 53 36 53 34 58 41 Comp shell bottom temperature F 144 128 146 129 132 136 Re...

Page 15: ...0 5 1 0 1 5 Hz 0 50 100 150 0 5 1 0 1 5 Hz 0 50 100 150 0 5 1 0 1 5 Hz 0 50 100 150 1 0 0 5 1 5 2 0 2 5 Hz MUZ FE18NA Capacity correction factors Input correction factors Input correction factors Capacity correction factors Correction of Cooling capacity The operational frequency of compressor Correction of Cooling total input The operational frequency of compressor Correction of Heating total inp...

Page 16: ...nds after the compressor has stopped running 8 3 RELATION BETWEEN MAIN SENSOR AND ACTUATOR Sensor Purpose Actuator Compressor LEV Outdoor fan motor R V coil Indoor fan motor Discharge temperature thermistor Protection Indoor coil temperature thermistor Cooling Coil frost prevention Heating High pressure protection Defrost thermistor Cooling High pressure protection Heating Defrosting Fin temperatu...

Page 17: ...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 ...

Page 18: ...er all LCD in operation display section of the remote controller is displayed after 3 seconds 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 Judgment of indoor outdoor abnormality Before blinking does POWER lamp MSZ FE09 12NA the upper lamp of OPERATION INDICATOR lamp MSZ FE18NA stay ON for 3 se...

Page 19: ... Turn OFF the power supply and turn it ON again Press RESET button of the remote controller Repair the defective parts The outdoor unit is normal Release the failure mode recall function accord ing to the left mentioned procedure 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 OPE...

Page 20: ...7 time flash 2 5 seconds OFF 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 Check around outdoor unit Check outdoor unit air passage Refer to 10 5 Check of outdoor fan motor 8 time fl...

Page 21: ...eds 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 Check around outdoor unit Check outdoor unit air passage Refer to 10 5 Check of outdoor fan motor 10 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 tur...

Page 22: ...ent flows into IGBT Insulated Gate Bipolar tran sistor TR821 or the bus bar voltage reaches 320 V or more PAM stops and restarts 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 MUZ FE18NA Zero cross detect ing circuit Zero cross signal for PAM control cannot be detec...

Page 23: ... point diagram and voltage 1 Inverter P C board the chart of thermistor Compressor Measure the resistance between terminals using a tester Winding temperature 4 104 F 20 40 C Normal U V U W V W MUZ FE09 12NA MUZ FE18NA 1 52 2 17 Ω 0 83 1 18 Ω Outdoor fan motor Measure the resistance between lead wires using a tester Part temperature 4 104 F 20 40 C Color of lead wire Normal RED BLK BLK WHT WHT RED...

Page 24: ...tion method Start cooling or heating operation by pressing EMERGENCY OPERATION switch on the indoor unit TEST RUN OPERA TION Refer to 7 6 Measurement point at 3 points BLK U WHT V BLK U RED W WHT V RED W NOTE 1 Output voltage varies according to power supply voltage 2 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 Measure...

Page 25: ...check Contact of the compressor connector Output voltage of inverter P C board and balance of them See 10 5 Direct current voltage between DB61 and MUZ FE09 12NA JP715 and JP30 MUZ FE18NA on the inverter P C board Voltage between outdoor terminal block S1 S2 1 2 3 4 1 Heat the compressor with a drier for about 20 minutes Do not recover refrigerant gas while heating Heating part Connect the compres...

Page 26: ...cted Is there 208 230 VAC between CN721 MUZ FE09 12NA CN602 MUZ FE18NA and on the inverter P C board 3 minutes after the power supply is turned ON No Yes Replace the inverter P C board Replace the 4 way valve Unit operates COOL mode even if it is set to HEAT mode Is there 208 230 VAC between CN721 MUZ FE09 12NA CN602 MUZ FE18NA and on the inverter P C board 3 minutes after the power supply is turn...

Page 27: ... to 10 4 Disconnect CN932 from the inverter P C board and turn on the power supply Rotate the outdoor fan motor manually and measure the voltage of CN931 Between 1 and 5 Between 2 and 5 Between 3 and 5 Does the voltage between each terminal become 5 and 0 VDC repeatedly Does the outdoor fan motor rotate smoothly Replace the outdoor fan motor Replace the inverter P C board Yes Yes No Fixed to eithe...

Page 28: ...light up Does LED on the inverter P C board light up or flash Refer to 10 6 1 No Replace the inverter P C board Is there bus bar voltage 260 325 VDC between DB61 and DB61 on the inverter P C board Refer to 10 6 1 No Check the electric parts in main circuit Yes Yes No Disconnect the connector CN61 between compressor and intelligent power module Turn ON power supply and press EMERGENCY OPERATION swi...

Page 29: ...f OPERATION INDICATOR on the indoor unit light up Does LED on the inverter P C board light up or flash Refer to 10 6 1 No Replace the inverter P C board Is there bus bar voltage 325 370 VDC between JP715 and JP30 on the inverter P C board Refer to 10 6 1 No Check the electric parts in main circuit Yes Yes No Disconnect the connector between compressor and intelligent power module Turn ON power sup...

Page 30: ...ge by an analog tester Properly fix the LEV coil to the expansion valve Replace the inverter P C board Replace the LEV coil Replace the expansion valve Is LEV coil properly fixed to the expansion valve Does the resistance of LEV coil have the characteristics Refer to 10 4 Do you hear the expansion valve click click Do you feel the expansion valve vibrate on touching it Turn ON the power supply Pre...

Page 31: ...door fan motor If the connection is poor make it correct Operate the outdoor unit by starting EMERGENCY OPERATION Check the LED indication on the in verter P C board Does the LED flash 10 times Replace the inverter P C board Check the remedy following LED indication Refer to 10 3 Yes No Yes 10 time flash No L Check of inverter P C board Only for MUZ FE18NA ...

Page 32: ...nnect ing wire Yes Correct them No A Turn OFF the power supply Check once more if the indoor outdoor connecting wire is not miswiring Short circuit outdoor terminal block S2 and S3 1 B 1 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 Turn ON the power supply Does the LED on the inverter P C board r...

Page 33: ...ength 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 noise 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 ...

Page 34: ...Ω 1 Inverter P C board MUZ FE09NA MUZ FE12NA Back side of unit Fin temperature thermistor RT64 CN642 Ambient temperature thermistor RT65 CN643 Discharge temperature thermistor RT62 CN641 Defrost thermistor RT61 CN641 LEV connector CN724 Bus bar voltage DB61 260 325 VDC Front side of unit 208 230 VAC Smoothing capacitor C62 Output to drive com pressor LDU LDV LDW Fuse F701 T3 15AL250V Smoothing cap...

Page 35: ...mperature thermistor RT64 Resistance k Resistance k Resistance k Fin temperature thermistor RT64 CN673 Ambient temperature thermistor RT65 CN672 Discharge temperature thermistor RT62 CN671 Defrost thermistor RT61 CN671 Output to drive outdoor fan motor CN932 Outdoor heat exchanger temperature thermistor RT68 CN671 Fuse F901 T3 15AL250V Fuse F880 T3 15AL250V LEV connector CN724 Jumper wire for chan...

Page 36: ... cabinet Back panel Service panel Screws of the top panel Screw of the cabinet Screws of the top panel Hooks Photo 2 Screw of the conduit cover Conduit plate Screw of the service panel Conduit cover 11 DISASSEMBLY INSTRUCTIONS 1 Slide the sleeve and check if there is a locking lever or not 2 The terminal with this connector has the locking mechanism Slide the sleeve Pull the terminal while pushing...

Page 37: ...il Photo 5 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 Inverter P C board CN721 R V coil CN932 Fan motor CN641 Defrost thermistor and discharge temperature ther mistor CN643 Ambient...

Page 38: ...ls 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 Photo 8 Photo 6 Pho...

Page 39: ... 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 Photo 2 Photo 1 Photo 3 Screws of the cabinet Screws of the top panel Screws of the cabinet Screws of the top panel Screws of the back panel Screws of the service panel Screws of the bac...

Page 40: ...emove the compressor connector 4 Remove the screws fixing the relay panel 5 Remove the relay panel 6 Remove the earth wires and the lead wires of the inverter P C board 7 Remove the screw of the PB support 8 Remove the inverter P C board from the relay panel Photo 4 Photo 5 3 Removing R V coil 1 Remove the cabinet and panels Refer to 1 2 Disconnect the following connector Inverter P C board CN602 ...

Page 41: ...n motor 1 Remove the top panel cabinet and service panel Refer to 1 2 Disconnect the following connectors Inverter P C board CN931 and CN932 Fan motor 3 Remove the propeller 4 Remove the screws fixing the fan motor 5 Remove the fan motor 6 Removing the compressor and 4 way valve 1 Remove the top panel cabinet and service panel Refer to 1 2 Remove the back panel Refer to 1 3 Remove the inverter ass...

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Page 44: ...U TOKYO 100 8310 JAPAN Copyright 2009 MITSUBISHI ELECTRIC CO LTD Distributed in Sep 2010 No OBH543 REVISED EDITION A 5 Distributed in Jul 2009 No OBH543 5 Made in Japan New publication effective Sep 2010 Specifications subject to change without notice ...

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