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OCH684

11-4. TROUBLE CRITERION OF MAIN PARTS

Parts name

Figure

Check method and criterion

Outdoor fan motor

R.V. coil (21S4)

Expansion valve coil

(LEV)

Measure the resistance between terminals with a tester.

(Temperature:

−

10 to 40°C)

WH - BK

BK - RD

RD - WH

Normal

Measure the resistance between terminals with a tester.

(Temperature :

−

10 to 40°C)

Normal

Measure the resistance with a tester.

Refer to “11-6. Test point diagram and voltage”, 11-6-1. (M25/35/50) or

11-6-2. (M60/71) “Inverter P.C. board”, for the chart of thermistor.

Color of the lead wire

Discharge temperature

thermistor (RT62)

Measure the resistance with 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. (M25/35/50) or

11-6-2. (M60/71) “Inverter P.C. board”, for the chart of thermistor.

Defrost thermistor (RT61)

Fin temperature

thermistor (RT64)

32 to 43

Ω

Measure the resistance between terminals with a tester.

(Temperature:

−

10 to 40°C)

Compressor

U-V

U-W

V-W

Normal

RD BK

Ambient temperature

thermistor (RT65)
Outdoor heat exchanger

temperature thermistor(RT68)

SUZ-M25

1.59 to 2.16Ω

SUZ-M35

1.60 to 2.17 Ω

1.41 to 2.00 k

Ω

SUZ-M50/60

0.82 to 1.11 Ω

SUZ-M71

0.87 to 1.18 Ω

SUZ-M25/35

SUZ-M50

15 to 20

Ω

LEV

Measure the resistance with a tester.

(Temperature :

−

10 to 40°C)

RD - OG

RD - WH

RD - BU

RD - YE

Normal

37 to 54

Ω

Color of the lead wire

SUZ-M60/71

25 to 34

Ω

1.17 to 1.66 k

Ω

SUZ-M25/35/50

SUZ-M60/71

SUZ-M25VA.TH

SUZ-M35VA.TH

SUZ-M50VA.TH

SUZ-M25VA-ET.TH

SUZ-M35VA-ET.TH

SUZ-M50VA-ET.TH

SUZ-M60VA.TH SUZ-M71VA.TH

SUZ-M60VA-ET.TH SUZ-M71VA-ET.TH

Содержание SUZ-M25VA

Страница 1: ...ND DIMENSIONS 14 7 WIRING DIAGRAM 16 8 REFRIGERANT SYSTEM DIAGRAM 20 9 ACTUATOR CONTROL 23 10 SERVICE FUNCTIONS 24 11 TROUBLESHOOTING 24 12 DISASSEMBLY PROCEDURE 41 Note This service manual describes service data of the outdoor units only HFC utilized R32 SUZ M25VA TH SUZ M35VA TH PARTS CATALOG OCB684 No OCH684 December 2018 SPLIT TYPE HEAT PUMP AIR CONDITIONERS Service Ref SUZ M25VA TH SUZ M25VA ...

Страница 2: ... OCB697 PLA M50EA UK PLA M60EA UK PLA M71EA UK PCA M35KA OCH659 OCB659 PCA M50KA PCA M60KA PCA M71KA PEAD M35JA L UK BWE017010 PEAD M50JA L UK PEAD M60JA L UK PEAD M71JA L UK 2 1 ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal all supply circuits must be disconnected 2 SAFETY PRECAUTION MEANINGS OF SYMBOLS DISPLAYED ON THE UNIT WARNING This mark is for R32 refrigerant only Refrigeran...

Страница 3: ... 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 our products We will not be held responsible for mechanical failure system malfunction unit breakdown or accidents caused by failure to follow the instructions Ventilate the room if refrigerant leaks during operation If refrigerant comes into contact wit...

Страница 4: ...nous gases will be released 9 Do not use low temperature solder alloy in case of brazing the refrigerant pipes 10 When performing brazing work be sure to ventilate the room sufficiently Make sure that there are no hazardous or flammable materials nearby When performing the work in a closed room small room or similar location make sure that there are no refriger ant leaks before performing the work...

Страница 5: ...he Refrigeration Equipment Where electrical components are being changed they shall be fit for the purpose and to the correct specification At all times the manufacturer s maintenance and service guidelines shall be followed If in doubt consult the manufacturer s technical department for assistance The following checks shall be applied to installations using flammable refrigerants The charge size ...

Страница 6: ... procedures shall be used However for flammable refrigerants it is important that best practice is followed since flammability is a considera tion The following procedure shall be adhered to remove refrigerant purge the circuit with inert gas evacuate purge again with inert gas open the circuit by cutting or brazing The refrigerant charge shall be recovered into the correct recovery cylinders For ...

Страница 7: ...to cylinders ensure that only appropriate refrig erant recovery cylinders are employed Ensure that the correct number of cylinders for holding the total system charge are available All cylinders to be used are designated for the recovered refrigerant and labelled for that refrigerant i e special cylinders for the recovery of refrigerant Cylinders shall be complete with pressure relief valve and as...

Страница 8: ...our sides is open and in a sufficiently large space with out depressions 2 4 Minimum installation area If you unavoidably install a unit in a space where all four sides are blocked or there are depressions confirm that one of these situations A B or C is satisfied Note These countermeasures are for keeping safety not for specification guarantee A Secure sufficient installation space minimum instal...

Страница 9: ...fer to the spec nameplate or installation manual For the amount to be added locally refer to the installation manual Install the indoor unit so that the height from the floor to the bottom of the indoor unit is h0 for wall mounted 1 8 m or more for ceiling suspended cassette and ceiling concealed 2 2 m or more There are restrictions in installation height for each model so read the installation ma...

Страница 10: ...A TH SUZ M50VA ET TH Model SUZ M VA Drain socket 1 Air outlet Drain outlet Piping Drain hose Air inlet back and side SUZ M60VA TH SUZ M60VA ET TH SUZ M71VA TH SUZ M71VA ET TH Air outlet Drain outlet Piping Drain hose Air inlet back and side Piping Air outlet Drain outlet Air inlet back and side Drain hose ...

Страница 11: ...6 Refrigeration oil Model L 0 27 FW68S 0 35 FW68S 0 35 FW68S 0 40 FW68S Fan motor Model RC0J50 NC RC0J50 RA RC0J60 BC Current Cooling A 0 22 0 20 0 29 0 84 Heating 0 20 0 23 0 29 0 84 Dimensions W H D mm 800 550 285 800 714 285 840 880 330 Weight kg 30 35 41 54 Special remarks Air flow Cooling High m h 2 178 2 058 2 748 3 006 Low 1 038 906 1 320 1 716 Heating High 2 076 1 962 2 622 3 006 Med 1 788...

Страница 12: ...A 600 V DB65 25 A 600 V Fuse F61 25 A 250 V F62 15 A 250 V F701 F801 F901 T3 15 A L250 V F601 F880 F901 T3 15 A L250 V Power module IC700 15 A 600 V 20 A 600 V IC932 5 A 600 V Switch power transistor Q821 30 A 600 V Expansion valve coil LEV 12 V DC Reactor L61 18 mH 23 mH L 282 μH Diode D3A D3B 20 A 600 V Diode module DB41A DB41B 20 A 600 V Current Limiting PTC thermistor PTC64 PTC65 33Ω Terminal ...

Страница 13: ...C 70 BAND CENTER FREQUENCIES Hz NC 10 SUZ M35VA TH SUZ M35VA ET TH COOLING FUNCTION SPL dB A LINE High FAN SPEED HEATING 48 49 OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 0002 MICRO BAR 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 NC 10 SUZ M50VA TH SUZ M50VA ET TH Test conditions Cooling Dry bulb temperature 35 C Heating...

Страница 14: ...14 OCH684 mm inch mm inch 6 OUTLINES AND DIMENSIONS Unit mm SUZ M25VA TH SUZ M35VA TH SUZ M25VA ET TH SUZ M35VA ET TH Unit mm SUZ M50VA TH SUZ M50VA ET TH ...

Страница 15: ...panel 99 5 164 5 195 3 5 4 4 Liquid refrigerant pipe joint Refrigerant pipe flared Ø 6 35 Gas refrigerant pipe joint Refrigerant pipe flared Ø 12 7 Air in 350 mm or more 100 mm or more REQUIRED SPACE 100 mm or more 500 mm or more 2 1 500 mm or more when front and sides of the unit are clear 2 When any 2 sides of left right and rear of the unit are clear Clear 1 Unit mm ...

Страница 16: ...16 OCH684 7 WIRING DIAGRAM SUZ M25VA TH SUZ M25VA ET TH ...

Страница 17: ...17 OCH684 17 SUZ M35VA TH SUZ M35VA ET TH ...

Страница 18: ...18 OCH684 SUZ M50VA TH SUZ M50VA ET TH ...

Страница 19: ...19 OCH684 SUZ M60VA TH SUZ M71VA TH SUZ M60VA ET TH SUZ M71VA ET TH ...

Страница 20: ...0 ø2 0 240 M35 Outdoor heat exchanger temperature thermistor RT68 Muffler Outdoor heat exchanger LEV Strainer 50 ø4 0 ø2 4 240 M25 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 pip...

Страница 21: ...e 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 ø6 35 with heat insulator LEV R V coil heating ON cooling OFF Muffler Strainer 100 Outdoor heat exchanger temperature thermistor RT68 Ambient temperature thermistor RT65 Strainer 100 Strainer 50 Strainer 100 Muffler Capillar...

Страница 22: ...anifold valve to the service port of the stop valve on the gas pipe side of the outdoor unit 3 Fully close the stop valve on the liquid pipe side of the outdoor unit 4 Supply power circuit breaker 5 Perform the refrigerant collecting operation cooling test run For the PAR 3xMAA x represents 0 or later select Service Test Run from the main menu to start the test run and then select the cooling mode...

Страница 23: ...E The 4 way valve reverses for 5 seconds right before start up of the compressor 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 Heating Defrosting Fin temperature thermistor Protection Ambient temperatur...

Страница 24: ...e 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 and turn off the breaker 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 ca...

Страница 25: ... 2 5 seconds OFF DC voltage DC voltage of inverter cannot be detected normally Refer to 11 5 How to check in verter compressor 15 Outdoor unit operates 1 time blink 2 5 seconds OFF Frequency drop by current protection When the input current exceeds approximately 7A M25 8A M35 12A M50 14A M60 16A M71 compressor The unit is normal but check the following Check if indoor filters are clogged Check if ...

Страница 26: ...ttribute will appear will appear if no error history is available 4 Resetting the error history Press the F4 button Reset on the screen that shows the error history A confirmation screen will appear asking if you want to delete the error history Press the F4 button OK to delete the error history If deletion fails Request rejected will appear Unit not exist will appear if no indoor units that are c...

Страница 27: ...ppear on the remote controller display if the correct voltage 8 5 2 V DC is not supplied to the remote controller If this is the case check the remote controller wiring and indoor units OK No problems are found with the remote controller Check other parts for problems E3 6832 There is noise on the transmission line or the indoor unit or another remote controller is faulty Check the transmission li...

Страница 28: ...refer to the indoor unit installation Check code 4 digits or check code 2 digits Error detection attribute Address 3 digits or unit address No 2 digits When there is no error history When opposite side does not exist Alternate display 4 Error history reset The error history is displayed in 3 self diagnosis results display When theD button is pressed 2 times successively within 3 seconds the self d...

Страница 29: ...ormal Remote controller switching is necessary When the problem is other than the checked remote controller Error display 2 E3 6833 6832 blink Cannot send Error display 3 ERC and data error count are displayed Data error generation There is noise on the transmission line or the indoor unit or another remote controller is faulty Check the transmission line and the other remote controllers Data erro...

Страница 30: ...er sound the operation light blinks and the check code is output It takes 3 seconds at most for check code to appear 4 Point the remote controller at the sensor on the indoor unit and press the ON OFF button The check mode is cancelled Malfunction diagnosis method at maintenance service 11 3 5 Self diagnosis Wireless remote controller For SLZ model refer to the indoor unit s service manual In case...

Страница 31: ...ected by unit other than indoor unit outdoor unit etc Symptom 1 Indoor outdoor unit communication error 2 Transmitting error Outdoor unit 3 Open short of outdoor unit thermistors UP U3 U4 PL or others 14 Abnormlity of refrigerant circuit or other errors Refer to the technical manual for the outdoor unit 12 14 Fb FB PL Indoor unit control system error memory error etc E0 E3 E1 E2 Remote controller ...

Страница 32: ...oint diagram and voltage 11 6 1 M25 35 50 or 11 6 2 M60 71 Inverter P C board for the chart of thermistor Defrost thermistor RT61 Fin temperature thermistor RT64 32 to 43 Ω Measure the resistance between terminals with a tester Temperature 10 to 40 C Compressor U V U W V W Normal W U V WH RD BK W U V WH RD BK Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT68 SU...

Страница 33: ...he test run and then select the cooling mode For details or for other information about starting the test run when using remote controllers refer to the installation manual for the indoor unit or the remote controller Measurement point At 3 points BK U WH V BK U RD W WH V RD W NOTE 1 Output voltage varies according to power supply voltage 2 Measure the voltage by analog type tester 3 During this c...

Страница 34: ...surement Measure the time from the start of compressor to the stop of compressor due to overcurrent Is the resistance of thermistor normal M25 35 50 Refer to 11 6 1 M60 71 11 6 2 Disconnect the connector of thermistor in the outdoor P C board see below table and measure the resistance of thermistor Replace the thermistor except RT64 When RT64 is abnormal replace the inverter P C board Reconnect th...

Страница 35: ...s HEAT mode even if it is set to COOL mode Disconnect connector between the compressor and the intelligent power module Turn ON the power supply and start heating test run TEST RUN OPERATION Refer to 11 5 Disconnect connector between the compressor and the intelligent power module Turn ON the power supply and start cooling test run TEST RUN OPERATION Refer to 11 5 H Check of outdoor fan motor Is t...

Страница 36: ...ith a hand Yes Check the outdoor fan motor Refer to 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 correct it Operate the outdoor unit by starting EMERGENCY OPERATION Check the LED indication on the in verter P C board Does the LED blink 10 times Replace the inverter P C board Check the corres...

Страница 37: ... or the installation 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...

Страница 38: ... Yes The refrigerant gas amount may be 60 or less than the normal amount Identify where the gas is leaking from and fix the leak No CAUTION Do not start the operation again to prevent hazards The operation has stopped to prevent the diesel explosion caused by air trapped in the refrigerant circuit Close the stop valve and disconnect the power plug or turn the breaker OFF Note If the abnormality ca...

Страница 39: ...0 10 20 30 40 50 60 70 80 90 100110120 Fin temperature thermistor RT64 CN642 Ambient temperature thermistor RT65 CN643 Discharge temperature thermistor RT62 CN641 Defrost thermistor RT61 CN641 DB61 260 370 V DC Front side of unit 230 V AC Output to drive compressor LDU LDV LDW Fuse F701 T3 15AL250V R V coil CN721 230 V AC Jumper wire for changing defrost setting JS Signal of outdoor fan motor CN93...

Страница 40: ...0 80 100 120 140 160 180 200 Temperature 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 15...

Страница 41: ...5VA ET TH Indicates the visible parts in the photos figures Indicates the invisible parts in the photos figures NOTE Turn OFF the power supply before disassembly OPERATING PROCEDURE PHOTOS FIGURES 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 cord and indoor outdoor connecting wire 4 Remove the screws fi...

Страница 42: ...he cabinet and panels Refer to section 1 2 Disconnect the following connectors Inverter P C board CN721 R V coil 3 Remove the R V coil 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 section 1 2 Disconnect the lead wire to the reactor and the following con n...

Страница 43: ...on 1 2 Remove the inverter assembly Refer to section 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 brazed 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 brazed part of pipes connected with 4 way valve 7 Removing th...

Страница 44: ...ervice panel 5 Remove the top panel 6 Remove 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 2 Photo 1 Screws of the cabinet Screws of the top panel Screws of the cabinet Screws of the top panel Screw of the back panel Screws of the service...

Страница 45: ...onnect the lead wires of the heat exchanger temperature thermistor the defrost thermistor and discharge tempera ture thermistor to the connector on the inverter P C board Pull the lead wires toward you and put them on the right hook on the P C board support 2 Connect the lead wires of the LEV to the connector on the inverter P C board Pull the lead wires toward you and put them on the right hook o...

Страница 46: ...stor CN644 Outdoor heat exchanger temperature thermistor 3 Pull out the discharge temperature thermistor from its holder 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 5 Removing outdoor fan motor 1 Remove the cabinet and panels Refer to section 1 2 Disconne...

Страница 47: ...as from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 kg cm2 0 MPa 4 Detach the brazed part of the suction and the discharge pipe connected with compressor 5 Remove the compressor nuts 6 Remove the compressor 7 Detach the brazed part of pipes connected with 4 way valve Photo 9 Brazed parts of 4 way valve Suction pipe brazed part Discharge pipe brazed part...

Страница 48: ...he service panel 5 Remove the top panel 6 Remove 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 2 Photo 1 Screws of the cabinet Screws of the top panel Screws of the cabinet Screws of the top panel Screw of the back panel Screws of the cab...

Страница 49: ...es and the lead wires of the inverter P C board 5 Remove the screws of the P B support 6 Remove the P B support from the relay panel 7 Remove the screws of the inverter P C board 8 Remove the inverter P C board from P B support Notes about attaching the inverter P C board 1 When attaching the inverter P C board clip the lead wires of the reactor to the wire saddles on the bottom of relay panel 2 A...

Страница 50: ...lead wire to the reactor and the following connectors Inverter P C board CN671 Defrost thermistor discharge temperature thermis tor and outdoor heat exchanger temperature ther mistor CN672 Ambient temperature thermistor 3 Pull out the discharge temperature thermistor from its hold er Photo 8 4 Pull out the defrost thermistor from its holder 5 Pull out the outdoor heat exchanger temperature thermis...

Страница 51: ...l Refer to 1 2 Remove the back panel Refer to 1 3 Remove the screws fixing the relay panel 4 Remove the relay panel 5 Remove the inverter assembly Refer to 2 6 Recover gas from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 kg cm2 0 MPa 7 Detach the brazed part of the suction and the discharge pipe connected with compressor 8 Remove the compressor nuts 9 R...

Страница 52: ...FICE TOKYO BUILDING 2 7 3 MARUNOUCHI CHIYODA KU TOKYO100 8310 JAPAN Copyright 2018 MITSUBISHI ELECTRIC CORPORATION Published Dec 2018 No OCH684 Made in Japan Specifications are subject to change without notice ...

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