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Mitsubishi Electric SUZ-KA25VA2, Technical & Service Manual, Page: 19 / 74

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Mitsubishi Electric SUZ-KA25VA2 Technical & Service Manual Download Page 19

19

SUZ-KA71VA2.TH

Unit: mm

Outdoor

heat

exchanger

Flared connection

Defrost

thermistor

RT61

Discharge

temperature

thermistor

RT62

Flared connection

Stop valve

Stop valve

(with service port)

Capillary tube

ø

4.0

×ø

2.4

×

100

Refrigerant flow in cooling

Compressor

4-way valve

Refrigerant flow in heating

Refrigerant pipe 

ø

15.88

(with heat insulator)

Refrigerant pipe 

ø

9.52

(with heat insulator)

LEV

R.V. coil

heating ON

cooling OFF

Muffler

#100

Strainer

#100

Outdoor heat 

exchanger

temperature

thermistor

RT68

Ambient

temperature

thermistor

RT65

Strainer

#100

Summary of Contents for SUZ-KA25VA2

Page 1: ...ND FUNCTIONS 6 4 SPECIFICATION 7 5 NOISE CRITERIA CURVES 9 6 OUTLINES AND DIMENSIONS 10 7 WIRING DIAGRAM 13 8 REFRIGERANT SYSTEM DIAGRAM 17 9 ACTUATOR CONTROL 21 10 SERVICE FUNCTIONS 22 11 TROUBLESHOOTING 22 12 DISASSEMBLY INSTRUCTIONS 63 Indication of model name NOTE This service manual describes technical data of the outdoor units RoHS compliant products have G mark on the spec name plate For se...

Page 2: ... TH SEZ KD60VA L TH SEZ KD71VA L TH MFZ KA25VA E4 MFZ KA35VA E4 MFZ KA50VA E4 OC320 OB409 Indoor unit Service Manual No Service Ref Heat pump without electric heater KA25VA2 TH KA60VA2 TH KA71VA2 TH KA50VA2 TH HWE0711 KA35VA2 TH NOTE Please refer to the service manual of indoor unit or the technical data book for the combination data 1 1 INDOOR UNIT SERVICE MANUAL 2 ...

Page 3: ...igh as that of R22 some special tools and piping parts materials are required Refer to the table below 2 Take sufficient care not to allow water and other contaminations to enter the R410A refrigerant during storage and installation since it is more susceptible to contaminations than R22 3 For refrigerant piping use clean pressure proof parts materials specifically designed for R410A Refer to 2 Re...

Page 4: ...ew New New Gauge manifold Charge hose Torque wrench Flare tool Flare gauge Vacuum pump adapter Electronic scale for refrigerant charging No Not substitutable for R410A Yes Substitutable for R410A No 12 7 mm and 15 88 mm 1 Tools dedicated for the air conditioner with R410A refrigerant The following tools are required for R410A refrigerant Some R22 tools can be substituted for R410A tools The diamet...

Page 5: ... 4 Air purge Do not discharge the refrigerant into the atmosphere Take care not to discharge refrigerant into the atmosphere during installation reinstallation or repairs to the refrigerant circuit Use the vacuum pump for air purging for the purpose of environmental protection 5 Additional charge For additional charging charge the refrigerant from liquid phase of the gas cylinder If the refrigeran...

Page 6: ...A71VA2 TH Air outlet Drain outlet Piping Drain hose Air inlet back and side Piping Air outlet Air inlet back and side Drain hose Drain outlet Model SUZ KA25 35VA2 TH SUZ KA50 60VA2 TH SUZ KA71VA2 TH Drain socket 1 1 1 Drain cap 2 Piping Air outlet Drain outlet Air inlet back and side Drain hose ...

Page 7: ... RED 37 0 RED WHT 37 0 2 004 800 550 285 33 1 05 320 NEO22 Cooling 4 22 0 33 47 Heating 4 42 0 33 48 840 480 800 620 Single phase 230V 50Hz 6 75 0 30 SNB130FGBH T 900 U V 0 98 U W 0 98 V W 0 98 RC0J60 AA WHT BLK 15 2 BLK RED 15 2 RED WHT 15 2 840 850 330 53 2 1 60 450 NEO22 Cooling 6 45 2 940 1 650 53 51 Heating 6 05 2 940 2 210 55 53 840 480 800 620 Single phase 230V 50Hz 9 75 0 30 SNB130FGBH T 9...

Page 8: ...L250V F911 250V 1A Inteligent power module IPM 15A 600V 20A 600V 15A 600V 20A 600V HC930 3A 450V IC932 5A 600V Power factor controller PFC PS51259 A 20A 600V Expansion valve coil LEV DC12V High pressure switch HPS ACB DB156 for R2 Reactor L61 23mH L 340μH 20A 340μH Current detecting resistor R61 45mΩ 5W 1 element 100mΩ 5W 2 elements R61 R62 180mΩ 5W 2 elements R64A R64B 10Ω 10W R825 25mΩ 5W R937 R...

Page 9: ... bulb temperature 7 Wet bulb temperature 6 High Med SUZ KA35VA2 TH COOLING FUNCTION SPL dB A LINE High FAN SPEED HEATING 53 55 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 BAND CENTER FREQUENCIES Hz Test conditions Cooling Dry bulb temperature 35 Wet bulb temperature 24 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE Heating Dry bulb tempe...

Page 10: ...ation 304 325 40 Liquid refrigerant pipe joint Refrigerant pipe flared 6 35 Gas refrigerant pipe joint Refrigerant pipe flared 9 52 4 3 3 5 2 Oval holes 10 21 REQUIRED SPACE Basically open 100mm or more without any obstruction in front and on both sides of the unit 350mm or more 200mm or more 100mm or more 100mm or more Open two sides of left right or rear side Drain hole 42 Unit mm SUZ KA25VA2 TH...

Page 11: ...th sides Open as a rule 500mm or more if the back both sides and top are open 350mm or more 100mm or more Bolt pitch for installation 360 Service panel Gas refrigerant pipe joint Refrigerant pipe flared 12 7 SUZ KA50VA2 TH 15 88 SUZ KA60VA2 TH Liquid refrigerant pipe joint Refrigerant pipe flared 6 35 REQUIRED SPACE Drain holes 33 Air in Air in Air out 4 Oval holes 10 21 SUZ KA50VA2 TH SUZ KA60VA2...

Page 12: ...flared Ø 9 52 Gas refrigerant pipe joint Refrigerant pipe flared Ø 15 88 350 mm or more 100 mm or more REQUIRED SPACE Open as a rule 500mm or more if the front and both sides are open 100mm or more 200mm or more if there are obstacles to both sides Open as a rule 500mm or more if the back both sides and top are open Air in Bolt pitch for installation 360 SUZ KA71VA2 TH Unit mm ...

Page 13: ...SUZ KA25VA2 TH SUZ KA35VA2 TH NOTES 1 About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing 2 Use copper conductors only For field wiring 3 Symbols below indicate Terminal block ...

Page 14: ...unit electric wiring 1 About the indoor side electric wiring NOTES SYMBOL NAME SYMBOL NAME SMOOTHING CAPACITOR FUSE T20AL 250V LEV EXPANSION VALVE COIL L61 REACTOR HC930 IPM INTELLIGENT POWER DEVICE C61 62 63 DIODE MODULE DB61 DB65 CT CURRENT TRANSFORMER F701 F801 F901 INTELLIGENT POWER MODULE F61 DSA SURGE ABSORBER FAN MOTOR CIRCUIT PROTECTION RT61 DISCHARGE TEMP THERMISTOR R937A B MF MC COMPRESS...

Page 15: ...64 CT1 2 CURRENT TRANSFORMER HC930 INTELLIGENT POWER MODULE F911 F801 FUSE T3 15AL 250V SMOOTHING CAPACITOR CB1 3 FAN MOTOR POWER FACTOR CONTROLLER NOISE FILTER RT61 DISCHARGE TEMP THERMISTOR RS1 4 RESISTOR R937A B RESISTOR MF MC COMPRESSOR R64A B RESISTOR PFC NF NR64 VARISTOR AMBIENT TEMP THERMISTOR SOLENOID COIL RELAY 21S4 REVERSING VALVE COIL X64 RELAY TB1 TERMINAL BLOCK TB2 TERMINAL BLOCK RT65...

Page 16: ...16 SUZ KA71VA2 TH ...

Page 17: ...65 Muffler Capillary tube ø3 0 ø2 0 240 Outdoor heat exchanger temperature thermistor RT68 Muffler Outdoor heat exchanger LEV Outdoor heat exchanger Flared connection Defrost thermistor RT61 Discharge temperature thermistor RT62 Flared connection Stop valve with strainer Stop valve with service port Refrigerant flow in cooling Compressor 4 way valve Refrigerant flow in heating Refrigerant pipe ø9 ...

Page 18: ...r 100 Refrigerant flow in cooling Refrigerant flow in heating R V coil heating ON cooling OFF Unit mm SUZ KA60VA2 TH Outdoor heat exchanger Flared connection Defrost thermistor RT61 Discharge temperature thermistor RT62 Flared connection Stop valve Stop valve with service port Capillary tube 3 6 2 4 50 Refrigerant flow in cooling Compressor 4 way valve Refrigerant flow in heating Refrigerant pipe ...

Page 19: ...ith service port Capillary tube ø4 0 ø2 4 100 Refrigerant flow in cooling Compressor 4 way valve Refrigerant flow in heating Refrigerant pipe ø15 88 with heat insulator Refrigerant pipe ø9 52 with heat insulator LEV R V coil heating ON cooling OFF Muffler 100 Strainer 100 Outdoor heat exchanger temperature thermistor RT68 Ambient temperature thermistor RT65 Strainer 100 ...

Page 20: ...m 12m 13m 14m 15m 20m SUZ KA25VA2 TH 800 0 0 0 90 120 150 180 210 240 270 300 450 SUZ KA35VA2 TH 1 050 0 0 0 90 120 150 180 210 240 270 300 450 Calculation Xg 30g mo Refrigerant piping length m 5 Models Refrigerant piping m Piping size O D mm Max Length A Max Height difference B Gas Liquid SUZ KA25VA2 TH 20 12 9 52 6 35 SUZ KA35VA2 TH SUZ KA50VA2 TH 30 30 15 12 7 SUZ KA60VA2 TH 15 88 SUZ KA71VA2 T...

Page 21: ... the compressor starts up OFF The fan motor turns OFF 15 seconds after the compressor has stopped running e s o p r u P r o s n e S Actuator Compressor LEV Outdoor fan motor R V coil Discharge temperature thermistor Protection Indoor coil temperature thermistor Cooling Coil frost prevention Heating High pressure protection Defrost thermistor Heating Defrosting Fin temperature thermistor Protection...

Page 22: ...VA2 TH SUZ KA71VA2 TH 11 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 the following during servicing 1 Before servicing the air conditioner be sure to turn OFF the main unit first with the remote controller and turn off the breaker 2 Be sure to turn OFF the power supp...

Page 23: ...he failure mode recall function by the following procedures With the remote controller headed towards the indoor unit press any button that is not used in this failure mode recall function e g TIMER button OR Turn OFF the power supply and turn ON it again Press RESET button of the remote controller Judgment of indoor outdoor abnormality 1 Press OPERATE STOP ON OFF button of the remote controller t...

Page 24: ... E9 Indoor outdoor unit communication error Transmitting error Outdoor unit 2 UP Compressor overcurrent interruption 3 U3 U4 Open short of outdoor unit thermistors 4 UF Compressor overcurrent interruption When compressor locked 5 U2 Abnormal high discharging temperature insufficient refrigerant 6 U1 Ud Abnormal high pressure 63H worked Overheating protection operation 7 U5 Abnormal temperature of ...

Page 25: ... HEAT mode Temperature defrost thermistor exceeds 70 C in COOL mode Check refrigerant circuit and refrigerant amount Check 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 75 80 C or temperature of P C board temperature thermistor on the inverter P C board exceeds 70 75 C Check around outdoor u...

Page 26: ... cross detecting circuit protection When zero cross signal cannot be detected while the compressor is operating Goes out 5 times 6 times Converter protection Bus bar voltage protection 1 When a failure is detected in the operation of the converter during operation When the bus bar voltage exceeds 400V or falls to 200V or below during compressor operating Once 3 times 4 times Lighting Goes out Goes...

Page 27: ...mperature P C board temperature 7 time flash 2 5 seconds OFF Temperature of fin temperature thermistor on the inverter P C board exceeds 75 80 C or temperature of P C board temperature thermistor on the inverter P C board exceeds 70 75 C Check around outdoor unit Check outdoor unit air passage Refer to 11 5 i Check of outdoor fan motor Outdoor fan motor Outdoor fan has stopped 3 times in a row wit...

Page 28: ...nd outdoor unit Check outdoor unit air passage fan motor 10 5 time flash 2 5 seconds OFF High pressure protec tion Indoor coil thermistor exceeds 70 C in HEAT mode Defrost thermistor exceeds 70 C in COOL mode Check refrigerant circuit and refrig erant amount Check stop valve 11 8 time flash 2 5 seconds OFF Compressor synchro nous abnormality The waveform of compressor current is distorted Reconnec...

Page 29: ... High pressure protection 8 times Goes out Converter protection Replace the power board Bus bar voltage protection 1 Replace the power board Bus bar voltage protection 2 13 times Goes out Outdoor fan motor Refer to 11 5 Check of outdoor fan motor Lighting 8 times Current sensor protection Replace the power board Lighting 11 times Communication between P C boards protection Check the connecting wir...

Page 30: ...e following points Check if indoor filters are clogged Check if refrigerant is short Check if indoor outdoor unit air circulation is short cycled Twice Lighting Once Lighting When the discharge temperature exceeds 100 during operation When the frequency of the compressor is kept 80Hz or more and the discharge temperature is kept under 39 for more than 20 minutes When the outdoor heat exchanger tem...

Page 31: ...s abnormal ity The waveform of compressor current is distorted Reconnect connector of compres sor Refer to 11 5 a How to check in verter compressor 12 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 11 5 i Check of outdoor fan motor Refer to 11 5 l Check of inverter P C board 13 12 time flash 2 5 seconds...

Page 32: ...P C board for the chart of thermistor Color of the lead wire Color of the lead wire Discharge temperature thermistor RT62 Measure the resistance using a tester Before measurement hold the thermistor with your hands to warm it up Refer to 11 6 Test point diagram and voltage 11 6 1 Inverter P C board for the chart of thermistor Defrost thermistor RT61 Fin temperature thermistor RT64 29 42 Measure th...

Page 33: ...Color of the lead wire Color of the lead wire Discharge temperature thermistor RT62 Measure the resistance using a tester Before measurement hold the thermistor with your hands to warm it up Refer to 11 6 Test point diagram and voltage 11 6 4 Outdoor electronic control P C board or 11 6 2 11 6 3 Inverter P C board for the chart of thermistor Defrost thermistor RT61 Fin temperature thermistor RT64 ...

Page 34: ...ncy in COOL mode or 58Hz in HEAT mode 4 Indoor fan operates at High speed 5 After 30 minutes test run operation finishes and EMERGENCY OPERATION starts 6 To cancel test run operation EMERGENCY OPERATION press the EMERGENCY OPERATION switch or the ON OFF button on remote controller 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 supp...

Page 35: ...rature RT64 Between CN642 pin1 and pin2 Ambient temperature RT65 Between CN643 pin1 and pin2 Outdoor heat exchanger temperature RT68 Between CN644 pin1 and pin3 Replace the thermistor except RT64 When RT64 is abnormal replace the inverter P C board or the outdoor power board Replace the inverter P C board or the outdoor power board No No Is the thermistor normal Refer to 11 6 1 or 11 6 2 Reconnect...

Page 36: ... HEAT mode Disconnect connector between the compressor and the intelligent power module Turn ON the power supply and press EMERGENCY OPERATION switch once COOL mode SUZ KA25 35 50VA2 TH H Check of outdoor fan motor Is the resistance between each ter minal of outdoor fan motor normal Refer to 11 4 Check the connection between the connector CN931 and CN932 Disconnect CN932 from outdoor electronic co...

Page 37: ...ions 1 Turn OFF the power supply and turn ON it again 2 Press RESET button on the remote controller 1 Regardless of normal or abnormal condition a short beep is emitted once the signal is received Measure each voltage between connector pins of CN724 on the inverter P C board 1 Pin Pin 2 Pin Pin 3 Pin Pin 4 Pin Pin Is there about 3 5 VAC between each NOTE Measure the voltage by an analog tester Pro...

Page 38: ...of the LEV coil with a hand Yes Check the outdoor fan motor Refer to H Is the fuse F901 blown on the in verter P C board Check the connection of the connectors CN931 CN932 of the outdoor fan mo tor 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 ...

Page 39: ...electronic control P C board repeat 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 outdoor electronic control P C board 2 2 Be careful of 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...

Page 40: ...c control P C board repeat 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 outdoor electronic control P C board 2 2 Be careful of 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 betw...

Page 41: ...ation condition combination of specific conditions such as antennas or wiring Check the following 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 indoor outdoor unit o...

Page 42: ...pply circuit Is there voltage of 230V AC in the power supply terminal block Is the output voltage from the noise filter P C board 230V AC Is the input voltage to the outdoor electronic control P C board 325V DC Check the power supply cable Replace the outdoor electronic control P C board Replace the noise filter P C board Is fuse F64 blown Is the input voltage to the power board 230V AC Replace th...

Page 43: ...ude of 10 to 20V DC between outdoor terminal block S2 and S3 Confirmation of serial signal Is there rated voltage between indoor terminal block S1 and S2 Confirmation of power voltage Replace the indoor electronic control P C board Replace the inverter P C board or the outdoor electronic control P C board 2 Is there any error of the indoor outdoor connecting wire such as the damage of the wire int...

Page 44: ...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 Lighted or OFF No Yes No Yes 2 Be careful of the residual voltage of smoothing capacitor Be sure to release the failure mode recall function after checking Yes Yes No Yes Turn OFF the power supply Check once more if the indoor outdoor connecting wir...

Page 45: ...2 in noise filter P C board Is there normal resistance to R V coil 1 Disconnect the lead wire leading to the compressor 2 3 minutes after turning on the power supply start EMERGENCY OPERATION in COOL mode Is there voltage of 230V AC between pin1 and pin 2 at connector CN912 1 Turn off power supply of indoor and outdoor unit and disconnect the connector CN781 in the outdoor electronic control P C b...

Page 46: ... power supply start EMERGENCY OPERATION Is output balanced Clarify the causes by counting time until the inverter stops 0 to 10 seconds compressor rare short 10 to 60 seconds compressor lock 60 seconds to 5minutes refrigerant circuit defective 5 minutes or more normal Measure the voltage between each lead wire leading to the compressor U BLK V WHT V WHT W RED W RED U BLK Is voltage output on right...

Page 47: ...control P C board Disconnect the connector in the outdoor electronic control P C board or the outdoor power board see below table and measure the resistance of thermistor Is the thermistor normal Does thermistor operate 10 minutes or more though the thermistor abnormality is not displayed Replace the thermistor Normal Replace the outdoor electronic control P C board Check of outdoor fan motor Fan ...

Page 48: ... Outdoor unit does not operate at all or stops immediately due to overcurrent Check of current limiting resistor V Turn ON the power supply and press EMERGENCY OPERATION switch Replace the outdoor electronic control P C board or power P C board or the compressor Replace the noise filter P C board or the outdoor electronic control P C board Does the rush current limiting relay X64 work properly Ope...

Page 49: ...tage between the terminals Output voltage is 50 130 V The voltage may differ according to the tester Operation method Test run operation 1 Press EMERGENCY OPERATION switch to start COOL or HEAT mode COOL Press once HEAT Press twice 2 Test run operation starts and continues to operate for 30 minutes 3 Compressor operates at rated frequency in COOL mode or 74 Hz in HEAT mode 4 Indoor fan operates at...

Page 50: ...tes Do not recover refrigerant gas while heating Heating part 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 11 5 b Measurement Measure the time from the start of compressor to the stop of comp...

Page 51: ...N671 pin5 and pin6 First of all measure the resistance of R V coil to check if the coil is defective Refer to 11 4 In case CN602 is disconnected or R V coil is open voltage is generated between the terminal pins of the connector although no signal is being transmitted to R V coil Check if CN602 is connected Is there 230 VAC between CN602 and on the inverter P C board 3 minutes after the power supp...

Page 52: ... board Check the connection between the connector CN931 and CN932 J Check of power supply Is there voltage 230 VAC between the indoor terminal block S1 and S2 No Yes Replace the indoor electronic control P C board Rectify indoor outdoor connecting wire Yes If light up OK If flash refer to 11 3 Does the upper lamp of OPERATION INDICATOR on the indoor unit light up Dose LED on the inverter P C board...

Page 53: ...valve vibrate on touching it Turn ON the power supply Preparation of the remote controller While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time press RESET button First release RESET button And release the other two buttons after all LCD except the set temperature in operation display section of the remote controller is displayed after 3 seconds...

Page 54: ...r 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 corresponding parts following LED indication Refer to 11 3 Yes No Yes 10 time flash No l Check of inverter P C board SUZ KA71VA2 TH ...

Page 55: ...e indoor outdoor connect 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 i...

Page 56: ...nstallation condition combination of specific conditions such as antennas or wiring Check the following 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 indoor outdoor ...

Page 57: ...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 DC 260 300 V Front side of unit AC 230 V Smoothing capacitor C62 Output to drive compressor LDU LDV LDW Fuse F701 250 V 3 15 A Smoothing capacitor C61 Smoothing capacitor C63 Fuse F901 250 V 3 15 A R V c...

Page 58: ...e F901 250 V 3 15 A R V coil CN721 230 VAC LED monitor lamp Output to drive outdoor fan motor CN932 AC 230 V Outdoor heat exchanger temperature thermistor RT68 CN644 Signal of outdoor fan motor CN931 20 10 0 10 20 30 40 0 10 20 30 40 50 60 70 80 90 100 Temperature Defrost thermistor RT61 Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT68 Temperature Discharge te...

Page 59: ...mperature Fin temperature 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 Jump...

Page 60: ...ower board CN781 12V DC pulse wave 20 10 0 10 20 30 40 100 90 80 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 70 80 200 180 160 140 120 100 80 60 40 20 0 Resistance k Resistance k Temperature Temperature Defrost thermistor RT61 Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT68 Fin temperature thermistor RT64 0 10 20 30 40 50 60 70 80 90 100 110 120 700 600 500 40...

Page 61: ...0V AC 50Hz Input 230V AC 50Hz Output CN901 To electronic control P C board F64 FUSE 2A 250V F911 FUSE 1A 250V 11 6 5 Noise filter P C board SUZ KA60VA2 TH CN902 To power board CN903 To power board 230V AC50Hz Output NR64 VARISTOR ...

Page 62: ...6 5 15V 7 5 15V Signal reception From electronic control P C board 5V DC pulse wave CN3 Fin temperature thermistor RT64 325 370V DC Output Red White Connect to the compressor Voltage among phases 5V to 180V Connect to the earth CN5 Primary current detection Connect to the noise filter CN2 Connect to the controller board 1 5 Signal transmission To electronic control P C board 5V DC pulse wave 2 5 Z...

Page 63: ... mechanism Detaching points Connector Sleeve Locking lever NOTE Turn OFF power supply before disassembling S O T O P E R U D E C O R P G N I T A R E P O 1 Removing the cabinet 1 Remove the screw fixing the service panel 2 Pull down the service panel and remove it 3 Disconnect the power supply and indoor outdoor con necting wire 4 Remove the screws fixing the top panel 5 Remove the top panel 6 Remo...

Page 64: ...d panels Refer to 1 2 Disconnect the following connectors Inverter P C board CN721 R V coil 3 Remove the R V coil 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 con nectors Inverter P C b...

Page 65: ...ve 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 kg cm2 0 MPa 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 connect...

Page 66: ...ove the valve cover 7 Remove the screws of the cabinet 8 Remove the cabinet 9 Remove the screws of the back panel 10 Remove the back panel Photo 2 Photo 1 Photo 3 Screw of the top panel Screws of the cabinet Screws of the cabinet Screws of the top panel Screws of the cabinet Screw of the service panel Screw of the valve cover Screw of the motor support Set screws of the back panel Screws of the ba...

Page 67: ...thermistor Noise filter P C board CN912 4 way valve 3 Remove the compressor connector 4 Remove the screws fixing the relay panel 5 Remove the inverter assembly 6 Disconnect all connectors and lead wires on the electronic control P C board 7 Remove the electronic control P C board from the inverter assembly 8 Remove the screws fixing the power board assembly 9 Disconnect all connectors and lead wir...

Page 68: ...ermistor discharge temper ature thermistor outdoor heat exchanger tempera ture thermistor and ambient temperature thermistor 1 Remove the top panel cabinet and service panel Refer to 1 2 Remove the back panel Refer to 1 3 Remove the inverter assembly Refer to 2 4 Pull out the defrost thermistor from its holder Photo 8 5 Pull out the discharge temperature thermistor from its holder Photo 7 6 Pull o...

Page 69: ...ed part of the suction and the discharge pipe connected with compressor Photo 11 6 Remove the compressor nuts 7 Remove the compressor 8 Detach the welded part of 4 way valve and pipe Photo 10 OPERATING PROCEDURE PHOTOS Photo 10 7 Removing the reactor 1 Remove the top panel Refer to 1 2 Disconnect the reactor lead wire 3 Remove the screws of the reactor and remove the reactor Photo 12 Screws of the...

Page 70: ...ove the valve cover 7 Disconnect the power supply and indoor outdoor connect ing wire 8 Remove the screws of the cabinet 9 Remove the cabinet 10 Remove the screws of the back panel 11 Remove the back panel Photo 1 Photo 2 Screws of the cabinet Screws of the top panel Screws of the top panel Screw of the back panel Screws of the cabinet Screws of the cabinet Screws of the service panel Screw of the...

Page 71: ...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 3 Photo 4 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 72: ...fan 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 a...

Page 73: ...73 ...

Page 74: ...ARUNOUCHI CHIYODA KU TOKYO100 8310 JAPAN cCopyright 2010 MITSUBISHI ELECTRIC ENGINEERING CO LTD Distributed in May 2010 No OCH472 PDF 4 Made in Japan New publication effective May 2010 Specifications subject to change without notice ...

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