Mitsubishi Electric Mr.Slim MUZ-FD09NA Service Manual Download Page 2 | Manualshive

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Revision A:

• 3. SPECIFICATION has been corrected.

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Summary of Contents for Mr.Slim MUZ-FD09NA

Page 1: ...ERVICE FUNCTIONS 16 10 TROUBLESHOOTING 16 11 DISASSEMBLY INSTRUCTIONS 32 Wireless type Models MUZ FD09NA MUZ FD09NA U1 MUZ FD12NA MUZ FD12NA U1 OUTDOOR UNIT Indoor unit service manual MSZ FD NA Series OBH497 NOTE RoHS compliant products have G mark on the spec name plate TM HFC utilized R410A No OBH498 REVISED EDITION A PARTS CATALOG OBB498 Revision A 3 SPECIFICATION has been corrected Please void...

Page 2: ...2 Revision A 3 SPECIFICATION has been corrected ...

Page 3: ...3 3 1 TECHNICAL CHANGES MUZ FD09NA MUZ FD09NA U1 MUZ FD12NA MUZ FD12NA U1 1 New model PART NAMES AND FUNCTIONS 2 MUZ FD09NA MUZ FD12NA Air outlet Drain outlet Piping Drain hose Air inlet ...

Page 4: ...L R A 10 8 Refrigerant control Liner expansion valve Sound level 1 Cooling dB A 48 48 Heating dB A 49 49 Defrost method Reverse cycle Dimensions W in 31 1 2 D in 11 1 4 H in 21 5 8 Weight Ib 80 External finish Munsell 3Y 7 8 1 1 Remote controller Wireless type Control voltage by built in transformer VDC 12 24 Refrigerant piping Not supplied Refrigerant pipe size Min wall thickness Liquid in 1 4 0 ...

Page 5: ... 15 Max temperature Heating at minimum compressor Speed 70 60 62 56 5 High temperature Heating at minimum compressor Speed 70 60 47 43 Frost Accumulation at rated compressor Speed 70 60 35 33 Frost Accumulation 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 Con...

Page 6: ... 11 16 1 9 16 7 8 21 5 8 11 1 32 13 32 31 1 2 19 11 16 5 15 16 11 29 32 17 32 29 32 11 1 4 Air in handle Air in Air out 2 3 8 13 16 Oval hole Drain hole 1 5 8 REQUIRED SPACE Basically open 4 inch or 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 ...

Page 7: ...7 7 5 WIRING DIAGRAM MUZ FD09NA MUZ FD12NA ...

Page 8: ...0 118 I D 0 079 9 7 16 ø3 0 ø2 0 240 Outdoor heat exchanger temperature thermistor RT68 Muffler Max Length A Max Height difference B Indoor unit Outdoor unit MAX REFRIGERANT PIPING LENGTH and MAX HEIGHT DIFFERENCE Model Refrigerant piping ft Piping size O D in Max Length A Max Height difference B Gas Liquid MUZ FD09NA MUZ FD12NA 65 40 3 8 1 4 ADDITIONAL REFRIGERANT CHARGE R410A oz NOTE Refrigerant...

Page 9: ...ACITY Model Indoor air Outdoor intake air WB temperature F IDB 15 25 35 43 45 55 F TC TPC TC TPC TC TPC TC TPC TC TPC TC TPC MUZ FD09NA 75 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 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 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 FD12NA 75 7 9 0 73 9 9 0 86 11 8 0 96 13 3 1 00 13 7 1 02 15 5 1 06 70 8 4 0 71...

Page 10: ...ency is not the same as the actual frequency in operating Refer to 7 5 and 7 6 for the relationships between frequency and capacity 71 67 63 71 67 63 13 12 11 10 7 9 8 0 7 0 6 0 5 Indoor intake air WB temperature F Indoor intake air WB temperature F SHF at rating condition 0 76 307 CFM Airflow 65 75 85 95 105 115 Outdoor intake air DB temperature F Total power consumption kW Total capacity 10 3 Bt...

Page 11: ...ture 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 FD09NA PSIG Condensing 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 ...

Page 12: ... temperature F 12 Heating Data is based on the condition of outdoor humidity 75 Air flow should be set to High speed Data is for heating operation without any frost MUZ FD12NA MUZ FD09NA 75 70 65 PSIG PSIG Condensing pressure Outdoor ambient temperature 14 20 25 30 35 40 45 50 55 60 65 70 F 220 200 180 160 140 240 260 280 320 300 340 360 380 400 Indoor DB temperature F 75 70 65 Suction pressure Ou...

Page 13: ...t A 2 96 2 68 3 39 3 06 4 40 3 97 4 43 4 01 Fan motor current A 0 35 0 32 Refrigerant circuit Condensing pressure PSIG 376 355 402 392 Suction pressure PSIG 154 108 148 104 Discharge temperature F 143 144 161 159 Condensing temperature F 112 108 117 115 Suction temperature F 51 46 51 45 Comp shell bottom temperature F 144 128 146 129 Ref pipe length ft 25 Refrigerant charge R410A 2 lb 9 oz Indoor ...

Page 14: ... operational frequency of compressor Correction of Cooling total input The operational frequency of compressor Correction of Heating total input The operational frequency of compressor Correction of Heating capacity The operational frequency of compressor 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 0 5 1 0 1 5 Hz 0 50 100 150 1 0 2 0 Hz 7 6 TEST RUN OPERATION How to operat...

Page 15: ...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 temperature t...

Page 16: ...f 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 ...

Page 17: ...r 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 stay ON for 3 seconds Stays ON for 3 seconds without beep The outdoor unit is abnorma...

Page 18: ...f 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 OPERATE STOP ON OFF button of the remote controller the set temperature...

Page 19: ... mode Temperature of defrost thermistor exceeds 158 F 70 C in COOL mode Check refrigerant circuit and refrigerant amount Check stop valve 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 b...

Page 20: ...0 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 Indoor coil thermistor exceeds 158 F 70 C in HEAT mode Defrost thermistor exceeds 158 F 70 C in COOL mode Check refrigerant circuit and r...

Page 21: ...AM Pulse Ampli tude Modulation The overcurrent 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 20 9 time flash 2 5 seconds OFF Inverter check ...

Page 22: ... to 10 6 Test 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 1 52 2 17 Ω Outdoor fan motor Measure the resistance between lead wires using a tester Part temperature 14 104 F 10 40 C Color of lead wire Normal RED BLK BLK WHT WHT RED 11 16 Ω R V coil 21S4 ...

Page 23: ... operation by pressing EMERGENCY OPERATION switch on the indoor unit TEST RUN OPERATION 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 AC voltage between the lead wires at...

Page 24: ...trical circuit check Contact of the compressor connector including CN61 Output voltage of inverter P C board and balance of them See 10 5 Direct current voltage between DB61 and 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 compressor and ac...

Page 25: ... is not connected or R V coil is open voltage is generated between the terminal pins of the connector although any signal is not being transmitted to R V coil Check if CN721 is connected Is there 230 VAC between CN721 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...

Page 26: ... control P C board Rectify indoor outdoor connecting wire Yes If light up OK If flash refer to 10 3 Does POWER lamp on the indoor unit light up Dose 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 voltage 280 370 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 Disco...

Page 27: ...Measure the voltage 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...

Page 28: ...he 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 corresponding parts following LED indication Refer to 10 3 Inverter P C board Solder side CN932 Yes No Yes 10 time flash No L Check of inverter P C board ...

Page 29: ... 3 6 second OFF and 0 8 second ON quick blinking 3 Yes No Lighted or not lighted Replace the inverter P C board or the out door electronic control P C board 2 2 Be careful to the residual voltage of smoothing capacitor Turn OFF the power supply Remove the short circuit between outdoor terminal block S2 and S3 Turn ON the power supply Is there amplitude of 10 to 20 VDC between outdoor terminal bloc...

Page 30: ...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 31: ...stance kΩ 1 Inverter P C board MUZ FD09NA MUZ FD12NA 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 DB61 DC260 300 V Front side of unit AC 208 230 V Smoothing capacitor C62 Output to drive com pressor LDU LDV LDW Fuse F701 250 V 3 15 A Smoothing capacitor...

Page 32: ...ews of the 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 32 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 ...

Page 33: ...nd screw of the T B support See Photo 4 7 Remove the inverter P C board from the inverter assembly 3 Removing R V coil 1 Remove the cabinet and panels Refer to 1 2 Remove the R V coil See Photo 5 4 Removing the discharge temperature thermistor defrost thermistor and outdoor heat exchanger tem perature thermistor 1 Remove the cabinet and panels Refer to 1 2 Pull out the discharge temperature thermi...

Page 34: ... 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 welded part of the suction and the discharge pipe connected with compressor 5 Remove the nuts of compressor legs 6 Remove the compressor 7 Detach the welded part of pipes connected with 4 way valve See Photo 8 Pho...

Page 35: ...35 ...

Page 36: ...100 8310 JAPAN Copyright 2008 MITSUBISHI ELECTRIC ENGINEERING CO LTD Distributed in Mar 2008 No OBH498 REVISED EDITION A 7 Distributed in Jan 2008 No OBH498 7 Made in Japan New publication effective Mar 2008 Specifications subject to change without notice TM ...

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