Mitsubishi Electric MXZ-2HA40VF Service Manual Download Page 50 | Manualshive

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12-5. TROUBLE CRITERION OF MAIN PARTS

Part name

Check method and criterion

Defrost thermistor (RT61)
Fin temperature thermistor (RT64)
Ambient temperature thermistor (RT65)
Outdoor heat exchanger
temperature thermistor (RT68)

Measure the resistance with a tester.

Refer to 12-7. "TEST POINT DIAGRAM AND VOLTAGE" 1. "Inverter P.C. board", 2.
"Outdoor control P.C. board " or 3. "Outdoor power P.C. board" for the chart of thermis-
tor.

Discharge temperature thermistor
(RT62)

Measure the resistance with a tester.
Before measurement, hold the thermistor with your hands to warm it up.

Refer to 12-7. "TEST POINT DIAGRAM AND VOLTAGE" 1. "Inverter P.C. board", 2.
"Outdoor control P.C. board ", for the chart of thermistor.

Compressor

W

U

V

WHT

RED

BLK

Measure the resistance between terminals with a tester.
(Winding temperature : -10°C - 40°C)

Normal (Each phase)

0.86 - 1.06

Outdoor fan motor

2

3

W

U

V

1

WHT

RED BLK

MXZ-2HA40VF/2HA50VF

Measure the resistance between lead wires with a tester.
(Part temperature : -10°C - 40°C)

Normal (Each phase)

32 - 43

Outdoor fan motor

MXZ-3HA50VF

Refer to 12-6. .

R.V. coil

Measure the resistance with a tester. (Part temperature : -10°C - 40°C)

Normal

MXZ-2HA40VF
MXZ-2HA50VF

MXZ-3HA50VF

1.2 k - 1.56 k

1.26 k - 1.62 k

Linear expansion valve

LEV

WHT

RED

YLW

ORN

BLU

Measure the resistance with a tester. (Part temperature : -10°C - 40°C)

Color of lead wire

Normal

WHT - RED

37.4 - 53.9

RED - ORN

YLW - RED

RED - BLU

High pressure switch (HPS)

MXZ-3HA50VF

Pressure

Normal

HPS

3.43 ± 0.15 MPa

Close

4.14 ± 0.1 MPa

Open

MXZ-2HA40VF MXZ-2HA50VF MXZ-3HA50VF

OBH828A

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Summary of Contents for MXZ-2HA40VF

Page 1: ...ETY PRECAUTION 3 3 PART NAMES AND FUNCTIONS 13 4 SPECIFICATION 14 5 NOISE CRITERIA CURVES 17 6 OUTLINES AND DIMENSIONS 18 7 WIRING DIAGRAM 20 8 REFRIGERANT SYSTEM DIAGRAM 24 9 PERFORMANCE CURVES 27 10 ACTUATOR CONTROL 36 11 SERVICE FUNCTIONS 37 12 TROUBLESHOOTING 41 13 DISASSEMBLY INSTRUCTIONS 66 MXZ 2HA40VF MXZ 2HA50VF Revision A MXZ 2HA40 50VF E2 and MXZ 3HA50VF E2 have been added OBB828 is void...

Page 2: ...t turning off the power exercise great caution not to touch the live parts 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 our products We will not be held responsible for mech...

Page 3: ...efrigerant Do not touch the hot or cold areas in the refrigerating cycle When the repair or the inspection of the circuit needs to be done without turning off the power exercise great caution not to touch the live parts Use new refrigerant pipes In case of using the existing pipes for R22 be careful with the following Be sure to clean the pipes and make sure that the insides of the pipes are clean...

Page 4: ...refrige rant can cause deterioration of refrigerant oil etc Handle tools with care If dirt dust or moisture enters into refrigerant cycle that can cause deterioration of refrigerant oil or malfunction of com pressor Use the following tools specifically designed for use with R32 refrigerant The following tools are necessary to use R32 refrigerant Flare tool Electronic refrigerant charging scale Vac...

Page 5: ...nd accumulates it may ignite or poisonous gases may be released 11 Do not install the unit in places where refrigerant may build up or places with poor ventilation such as a semi basement or a sunken place in outdoor Refrigerant is heavier than air and inclined to fall away from the leak source 12 Do not use means to accelerate the defrosting process or to clean other than those recommended by the...

Page 6: ...geration 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 is in ac...

Page 7: ...res 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 applianc...

Page 8: ...ders 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 associated...

Page 9: ...if it is necessary to use a filter dryer If the diameter of the existing pipes is different from the specified diameter refer to technical data materials to confirm if the pipes can be used Perform the airtight test vacuum air purging additional refrigerant charging if necessary and gas leak check Measure the existing pipe thickness and check for damage The existing pipe thickness meets specifica ...

Page 10: ... 22 0 24 0 27 0 36 0 Nominal dimensions inch Flare nut dimensions Outside diameter mm Dimension B R32 R410a 36 0mm for indoor unit of RP100 125 and 140 R22 mm Dimension A Dimension B Tools and materials Use R32 tools Can R22 tools be used Can R407C tools be used Can R410a tools be used Gauge manifold Air purge refrigerant charge and operation check Tool exclusive for R32 Charge hose Tool exclusive...

Page 11: ...s open and in a sufficiently large space with out depressions 2 5 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 installation area...

Page 12: ...e 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 manual for ...

Page 13: ...SSORIES Model MXZ 2HA40VF MXZ 2HA50VF MXZ 3HA50VF Drain socket 1 1 Drain cap 2 Air outlet Drain outlet Air inlet Back and side MXZ 3HA50VF MXZ 2HA40VF MXZ 2HA50VF Air inlet Air outlet Drain outlet Piping Drain hose Back and side OBH828A ...

Page 14: ...formance C O P Total 1 2 3 81 4 73 Compressor Model SVB130FBBMT Output W 1 100 Current 1 2 A 4 15 Refrigeration oil Model L 0 35 FW68S Fan motor Model RC0J50 NA Current 1 2 A 0 35 Dimensions W x H x D mm 800 x 550 x 285 Weight kg 37 Special remarks Air flow Rated m3 h 1 704 2 010 Sound level Rated dB A 44 50 Fan speed Rated rpm 780 910 Pre charged refrigerant quantity R32 kg 0 9 Max refrigerant qu...

Page 15: ...C O P Total 1 2 3 29 3 90 Compressor Model SVB130FBBMT Output W 1 300 Current 1 2 A 6 75 Refrigeration oil Model L 0 35 FW68S Fan motor Model RC0J50 NA Current 1 2 A 0 35 Dimensions W x H x D mm 800 x 550 x 285 Weight kg 37 Special remarks Air flow Rated m3 h 1 962 2 082 Sound level Rated dB A 47 51 Fan speed Rated rpm 890 940 Pre charged refrigerant quantity R32 kg 0 9 Max refrigerant quantity R3...

Page 16: ... Total 1 2 3 97 4 62 Compressor Model SVB130FBBM1T Output W 1 300 Current 1 2 A 5 30 Refrigeration oil Model L 0 6 FW68S Fan motor Model SIC 82FX F764 1 Current 1 2 A 0 5 Dimensions W x H x D mm 840 x 710 x 330 Weight kg 57 Special remarks Air flow Rated m3 h 1 860 1 746 Sound level Rated dB A 46 50 Fan speed Rated rpm 600 580 Pre charged refrigerant quantity R32 kg 1 4 Max refrigerant quantity R3...

Page 17: ...2 MICRO BAR BAND CENTER FREQUENCIES Hz APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE Cooling High FUNCTION FAN SPEED Heating High 47 SPL dB A 51 LINE MXZ 2HA50VF MXZ 2HA40VF 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 OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 0002 MICRO BAR BAND CENTER FREQUENCIES Hz APPROXIMATE THRESHOLD OF HEARING FOR ...

Page 18: ...18 OUTLINES AND DIMENSIONS 6 MXZ 2HA40VF MXZ 2HA50VF Unit mm inch OBH828A ...

Page 19: ...Note Leave rear overhead and both sides free of obstruction 500 or more 100 or more Note Leave front and overhead free of obstruction 100 or more 350 or more 200 or more 500 or more 2 Service space 100 or more 500 or more 350 or more 350 or more 100 or more Service space MXZ 3HA50VF OBH828A ...

Page 20: ...DOOR UNIT No A POWER SUPPLY N 220 230 240V 50Hz BK BU BK BU RD OG ACL2 TB3 TB2 BK BU BREAKER CIRCUIT GNYE TB1 F1 3 LD66B LD62 CN602 5 CN601 1 LD E1 LD E2 1 BK BU BK BN BK BU RD OG LED1 LED2 CN936 OUTDOOR DISPLAY P C BOARD 7 3 1 3 1 MS 3 W V U RD WH F901 T801 F801 C62 C61 C63 ACL 1 2 CN642 BN OG 3 5 MS 3 1 2 1 CN643 RT65 RT64 INVERTER P C BOARD IC700 CNMC P U V W N IC932 N P U W V DB61 CN932 1 3 LD...

Page 21: ...0Hz BK BU BK BU RD OG ACL2 TB3 TB2 BK BU DEVRE KESİCİ GNYE TB1 F1 3 LD66B LD62 CN602 5 CN601 1 LD E1 LD E2 1 BK BU BK BN BK BU RD OG LED1 LED2 CN936 DIŞ GÖSTERGE BASKILI DEVRE KARTI 7 3 1 3 1 MS 3 W V U RD WH F901 T801 F801 C62 C61 C63 ACL 1 2 CN642 BN OG 3 5 MS 3 1 2 1 CN643 RT65 RT64 İNVERTÖR BASKILI DEVRE KARTI IC700 CNMC P U V W N IC932 N P U W V DB61 CN932 1 3 LD66A LD70 LDW LDV LDU RD BK WH ...

Page 22: ...22 MXZ 3HA50VF E1 MXZ 3HA50VF E2 OBH828A ...

Page 23: ...23 MXZ 3HA50VF ET1 OBH828A ...

Page 24: ... OUT Discharge temperature thermistor RT62 Stop valve with service port Stop valve with service port Sub muffler UNIT mm MXZ 2HA40VF MXZ 2HA50VF MAX REFRIGERANT PIPING LENGTH Piping length each indoor unit a b 20 m Total piping length a b 30 m Bending point for each unit 30 Total bending point 20 It is irrelevant which unit is higher a b Outdoor unit Indoor units 15 m 10 m 15 m Max Height differen...

Page 25: ...RT68 FAN OUT HEX OUT Strainer 100 Stop valve with service port Stop valve High pressure switch UNIT mm inch UNIT mm MXZ 3HA50VF Outdoor unit union diameter For Indoor unit A Liquid 6 35 1 4 Gas 9 52 3 8 Indoor unit B Liquid 6 35 1 4 Gas 9 52 3 8 Indoor unit C Liquid 6 35 1 4 Gas 9 52 3 8 a b c Outdoor unit Indoor units 15 m 10 m 15 m Max Height difference MAX REFRIGERANT PIPING LENGTH Piping lengt...

Page 26: ... unit installation manual about the method for stopping the operation If too much refrigerant has been added to the air conditioner system the pressure may not drop to 0 05 to 0 MPa Gauge ap proximately 0 5 to 0 kgf cm or the protection function may operate due to the pressure increase in the high pressure refriger ant circuit If this occurs use a refrigerant collecting device to collect all of th...

Page 27: ...lb temperature and the indoor outlet air wet and dry bulb temperature for your reference at service How to measure the indoor air wet and dry bulb temperature difference 1 Attach at least 2 sets of wet and dry bulb thermometers to the indoor air intake as shown in the figure and at least 2 sets of wet and dry bulb thermometers to the indoor air outlet The thermometers must be attached to the posit...

Page 28: ... intake air Wet bulb temperature C Indoor intake air Wet bulb temperature C 16 8 4 4 12 16 Capacity correction factors Outdoor intake air Wet bulb temperature ºC 15 20 26 0 6 0 7 0 8 0 9 1 0 1 1 1 2 1 3 0 5 0 4 Outdoor intake air Wet Heating capacity 1 4 12 0 8 18 16 8 4 4 12 16 Outdoor intake air Wet bulb temperature ºC 0 6 0 7 0 8 0 9 1 0 1 1 1 2 1 3 0 5 0 4 Outdoor intake air Wet 1 4 12 0 8 18 ...

Page 29: ...e air Wet bulb temperature C Indoor intake air Wet bulb temperature C MXZ 3HA50VF 0 6 0 7 0 8 0 9 1 0 1 1 1 2 1 3 16 8 4 4 12 18 Capacity correction factors Outdoor intake air Wet bulb temperature ºC Heating capacity 15 20 26 1 4 0 5 0 4 12 0 8 16 16 8 4 4 12 18 12 0 8 16 0 6 0 7 0 8 0 9 1 0 1 1 1 2 1 3 1 4 0 5 0 4 Input correction factors Total input Heating 26 20 15 Outdoor intake air Wet bulb t...

Page 30: ...HEAT Capacity Frequency Hz 0 50 100 150 0 5 1 0 1 5 2 0 0 50 100 150 0 5 1 0 1 5 2 0 2 5 HEAT Total input Frequency Hz COOL Capacity Frequency Hz 0 50 100 150 0 5 1 0 1 5 2 0 0 50 100 150 0 5 1 0 1 5 2 0 2 5 COOL Total input Frequency Hz HEAT Capacity Frequency Hz 0 50 100 150 0 5 1 0 1 5 2 0 0 50 100 150 0 5 1 0 1 5 2 0 HEAT Total input Frequency Hz 25 class unit MXZ 2HA40VF 35 class unit OBH828A...

Page 31: ... 0 5 1 0 1 5 2 0 0 50 100 150 0 5 1 0 1 5 2 0 2 5 COOL Total input Frequency Hz HEAT Capacity Frequency Hz 0 50 100 150 0 5 1 0 1 5 2 0 0 50 100 150 0 5 1 0 1 5 2 0 HEAT Total input Frequency Hz COOL Capacity Frequency Hz 0 50 100 150 0 5 1 0 1 5 2 0 0 50 100 150 0 5 1 0 1 5 2 0 COOL Total input Frequency Hz HEAT Capacity Frequency Hz 0 50 100 150 0 5 1 0 1 5 0 50 100 150 0 5 1 0 1 5 HEAT Total in...

Page 32: ...0 100 150 0 5 1 0 1 5 0 50 100 150 0 5 1 0 1 5 2 0 COOL Total input Frequency Hz HEAT Capacity Frequency Hz 0 50 100 150 0 5 1 0 1 5 2 0 0 50 100 150 0 5 1 0 1 5 2 0 HEAT Total input Frequency Hz HEAT Capacity Frequency Hz 0 50 100 150 0 5 1 0 1 5 2 0 0 50 100 150 0 5 1 0 1 5 2 0 HEAT Total input Frequency Hz HEAT Capacity Frequency Hz 0 50 100 150 0 5 1 0 1 5 0 50 100 150 0 5 1 0 1 5 HEAT Total i...

Page 33: ... unit current A Ambient temperature Ambient humidity Ambient temperature Ambient humidity 50 60 70 C 50 60 70 C 30Hz 30Hz 13 12 11 10 9 8 7 15 20 25 30 35 0 7 0 8 0 9 1 0 1 1 1 2 1 3 15 20 25 30 35 1 2 3 4 5 6 Outdoor low pressure MPa Gauge Outdoor unit current A Ambient temperature Ambient humidity Ambient temperature Ambient humidity 50 60 70 C 50 60 70 C 30Hz 30Hz 13 12 11 10 9 8 7 15 20 25 30 ...

Page 34: ... 70 C 40Hz 40Hz 14 13 12 11 10 9 8 15 20 25 30 35 0 8 0 9 1 0 1 1 1 2 1 3 1 4 15 20 25 30 35 1 2 3 4 5 6 42 class unit 50 class unit Outdoor low pressure MPa Gauge Outdoor unit current A Ambient temperature Ambient humidity Ambient temperature Ambient humidity 50 60 70 C 50 60 70 C 40Hz 40Hz 14 13 12 11 10 9 8 15 20 25 30 35 0 8 0 9 1 0 1 1 1 2 1 3 1 4 15 20 25 30 35 1 2 3 4 5 6 Outdoor low pressu...

Page 35: ...temperature 34Hz Outdoor unit current A 35 class unit 42 class unit 0 5 10 15 20 25 2 3 4 5 6 7 Ambient temperature 34Hz Outdoor unit current A 0 5 10 15 20 25 2 3 4 5 6 7 Ambient temperature 34Hz Outdoor unit current A MXZ 2HA50VF 50 class unit 25 class unit MXZ 3HA50VF 42 class unit 0 5 10 15 20 25 2 3 4 5 6 7 Ambient temperature 48Hz Outdoor unit current A 0 5 10 15 20 25 2 3 4 5 6 7 Ambient te...

Page 36: ...door heat exchanger temperature thermistor Cooling Control Protection Capacity code Control Relation between main sensor and actuator Sensor Purpose 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 ther...

Page 37: ...to lock the operation mode 1 Turn OFF the power supply and make sure that the LED goes off 2 Set SW1 as shown in the figure below 3 Turn ON the power supply 11 2 LOCKING THE OPERATION MODE OF THE AIR CONDITIONER COOL DRY HEAT SW1 on the outdoor display P C board MXZ 2HA40VF 2HA50VF MXZ 3HA50VF SW1 on the outdoor control P C board ON SW1 ON SW1 Cool Dry Heat ON 5 6 SW1 ON 5 6 SW1 Cool Dry Heat Outd...

Page 38: ...eating capacity may lower if this function is activated Changing the setting is required to activate this function Explain about this function to your customers and ask them whether they want to use it How to lower the operating noise 1 Turn OFF the power supply and make sure that the LED goes off 2 Set 3 on SW1 to ON to enable this function MXZ 2HA40VF 2HA50VF Set 5 on SW1 to ON the enable this f...

Page 39: ...nal block Refrigerant pipe Indoor unit B Liquid Gas pipe Indoor unit A Outdoor unit Incorrect wiring Terminal block Indoor unit B Liquid Gas pipe Indoor unit A Outdoor unit Incorrect piping Terminal block Indoor unit B Liquid Gas pipe Indoor unit A Outdoor unit B A B A B A B A B A B A MXZ 2HA40VF 2HA50VF SW2 on the outdoor display P C board The record of automatic line correcting can be checked in...

Page 40: ...will be stopped Operate indoor unit after the auto line correcting is finished Pressing the switch during detection cancels this function Make sure that the valves are open and the pipes are not collapsed or clogged LED indication after cancel LED1 Red Lit LED indication during detection LED indication after detection LED2 Yellow Lit LED3 Green Once LED1 Red Lit LED2 Yellow Lit LED3 Green Not lit ...

Page 41: ...nit first with the remote controller and after confirming 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 P C board 3 When removing the electrical parts be careful of the residual voltage of smoothing capacitor 4 When removing the P C board hold the edge of t...

Page 42: ...uttons to adjust the set temperature to 25 C 2 2 Regardless of normal or abnormal condition 2 short beeps are emitted as the signal is received The outdoor unit is abnormal Check the blinking pattern and make sure that the abnormal point with the table of outdoor unit failure mode recall function 12 2 3 Make sure to check at least 2 consecutive blinking cycles 3 Repair the failure parts The outdoo...

Page 43: ... the indoor gas pipe temperature exceeds 70ºC during heating Check the refrigerant circuit and the refrigerant amount Check the stop valve 7 time blink Fin temperature 3 times Not lit The fin temperature exceeds 90ºC during operation Check the around outdoor unit Check the outdoor unit air pas sage P C board temperature 4 times Not lit The P C board temperature exceeds 80ºC during operation Refer ...

Page 44: ...12 6 Check of outdoor fan motor P C board temperature 4 times Not lit The P C board temperature exceeds 67 C during operation 8 time blink Outdoor fan motor Lit Lit A failure occurs 3 consecutive times within 30 seconds after the fan gets started Refer to 12 6 Check of outdoor fan motor 9 time blink Outdoor control system Lit 5 times Nonvolatile memory data cannot be read prop erly Replace the out...

Page 45: ...n operating indoor unit gets warm Refer to 12 6 Check of LEV When heating room does not get warm Refer to 12 6 How to check inverter compressor Check mispiping shortage of capacity When cooling dew drops in the non operating indoor unit Check of mispiping Refer to 12 4 Troubleshooting check table Both LED1 and LED2 are OFF Both LED1 and LED2 are lighting LED1 or LED2 has blinked 12 3 INSTRUCTION O...

Page 46: ...d in the thermistor during operation A short or open circuit is detected in the thermistor during operation 5 times Lit Overcurrent 3 times Not lit Discharge temperature protection Fin temperature protection P C board temperature protection High pressure protection Replace the inverter P C board Bus bar voltage protection Not lit Outdoor fan motor 8 times Not lit Current sensor protection Replace ...

Page 47: ...llow Abnormal point Condition Remedy Indication Condition No Symptom Outdoor unit operates normally 22 23 Outdoor unit operates Outdoor display P C board Parts side Lit 8 times Lit Converter protection A failure is detected in the operation of the converter during operation 21 Check the voltage of power supply Replace the inverter P C board LED1 LED2 ON OFF 2 5 second OFF 2 5 second OFF 0 5 second...

Page 48: ...ng wire between M NET adapter P C board and outdoor control P C board or terminal block 10 Lit 12 times Zero cross detecting circuit Outdoor power P C board The protection cut out of the zero cross detecting circuit operates 10 consecutive times Replace the outdoor power P C board 11 Lit 13 times Current sensor A short or open circuit is detected in the input cur rent detection circuit during oper...

Page 49: ...of LEV Check refrigerant circuit and refrigerant amount 30 5 times Lit Cooling high pressure protection The outdoor heat exchanger temperature exceeds 58 C during operation This symptom does not mean any abnormality of the product but check the following points Check if indoor filters are clogged Check if refrigerant is short Check if indoor outdoor unit air circulation is short cycled 31 7 times ...

Page 50: ...rd for the chart of thermistor Compressor W U V WHT RED BLK Measure the resistance between terminals with a tester Winding temperature 10 C 40 C Normal Each phase 0 86 1 06 Outdoor fan motor 2 3 W U V 1 WHT RED BLK MXZ 2HA40VF 2HA50VF Measure the resistance between lead wires with a tester Part temperature 10 C 40 C Normal Each phase 32 43 Outdoor fan motor MXZ 3HA50VF Refer to 12 6 R V coil Measu...

Page 51: ...es No Yes Check the main power supply circuit for proper connections Is there voltage of 220 230 240 V AC in the power supply terminal block Is there voltage of 220 230 240 V AC between LD66B and X64 on the inverter P C board Check the power supply and correct them Replace the outdoor display P C board Replace the inverter P C board Is there voltage of 220 230 240 V AC between LD66A and LD70 on th...

Page 52: ... Does the LED on the outdoor display P C board or the outdoor control P C board repeat quick BLINKING and OFF 2 Replace the indoor electronic control P C board 1 4 Replace the inverter P C board or the outdoor control P C board 3 4 If the trouble sometimes occurs possible causes are as follows Poor connection of the indoor outdoor connecting wire Check for intermediate connection of the indoor out...

Page 53: ...age between indoor terminal block S1 and S2 Confirmation of power voltage Replace the indoor electronic control P C board 2 Be careful of the residual voltage of smoothing capacitor Replace the outdoor control P C board 2 Is there any error of the indoor outdoor connecting wire such as the damage of the wire intermediate connection poor contact to the terminal block Replace the indoor outdoor conn...

Page 54: ...nnector CN721 Replace the inverter P C board Replace the 4 way valve Replace the R V coil Is there normal resistance to R V coil Refer to 12 5 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 220 230 240 V AC between pin1 and pin2 at connector CN721 Replace the inverter P C board Replace th...

Page 55: ...220 230 240 V AC between the pin1 and pin3 at connector CNAC Replace the outdoor power P C board Is there normal resistance to R V coil Refer to 12 5 1 Disconnect the lead wire leading to the compressor 2 3 minutes after turning ON the power supply start EMERGENCY OPERATION in HEAT mode Is there voltage of 220 230 240 V AC between pin1 and pin2 at connector CN712 Replace the 4 way valve Replace th...

Page 56: ...4 LEV A CN725 LEV B MXZ 2HA CN791 LEV A CN792 LEV B CN793 LEV C MXZ 3HA CN797 LEV R MXZ 3HA Is there normal resistance to LEV coil Refer to 12 5 Normal Replace the outdoor control P C board Replace LEV coil When cooling heat exchanger of non operating indoor unit frosts When heating non operating indoor unit gets warm Connector MXZ 2HA MXZ 3HA CN724 CN725 Inverter P C board Outdoor control P C boa...

Page 57: ...esistance between the compressor terminals Is the resistance between each terminal normal Refer to 12 5 Except MXZ 2HA Is the input voltage to the outdoor control P C board 370 V or more Reconnect the lead wire of compressor and turn ON the power supply to indoor and outdoor unit 3 minutes later start EMERGENCY OPERATION Replace the compressor Replace the outdoor power P C board 1 After the outdoo...

Page 58: ...e compressor 3 minutes after turning ON the power supply start EMERGENCY OPERATION Thermistor Defrost Discharge temperature Fin temperature Ambient temperature Outdoor heat exchanger temperature Symbol RT61 RT62 RT64 RT65 RT68 Connector Pin No CN641 pin1 and pin2 CN641 pin3 and pin4 CN642 pin1 and pin2 CN643 pin1 and pin2 CN644 pin1 and pin3 Inverter P C board Board MXZ 2HA40VF MXZ 2HA50VF MXZ 3HA...

Page 59: ...y and measure the voltage of CN931 Between and Between and Between and Is the resistance of outdoor fan motor normal Refer to 12 5 Does the outdoor fan motor rotate smoothly Does the voltage between each terminal become 5 V DC and 0 V DC repeatedly Replace the outdoor fan motor Replace the inverter P C board or the outdoor control P C board No Yes Yes No Yes No Connector MXZ 2HA CN931 CN932 Invert...

Page 60: ...e tester to pin4 To measure the voltage connect the negative end of the tester to pin4 Voltage between pin4 and pin6 should be measured within 1 minute after the operation starts pin1 pin4 pin5 pin4 pin6 pin4 pin7 pin4 Voltage 15 V DC 325 V DC 1 5 V DC CNF1 pin1 pin4 pin5 pin4 pin6 pin4 Is the voltage of connector CNF1 normal Refer to right table Does the voltage between pin7 and pin4 of connector...

Page 61: ...ard 2 Check the resistance of HPS after 1 minute has passed since the outdoor unit power supply was turned OFF Check the resistance between each terminal Reconnect CN63H Turn ON the power supply to the indoor and outdoor unit 3 minutes later start EMERGENCY OPERATION Is HPS protection displayed immediately after compressor starts Replace HPS Replace the outdoor control P C board Normal Connector M...

Page 62: ...ed by air trapped in the refrigerant circuit Close the stop valve and disconnect the power plug or turn the breaker OFF The unit occasionally stops when the stop valve is opened or closed during operation Open the stop valve and start the cooling operation again Yes No The refrigerant gas amount may be 60 or less than the normal amount Identify where the gas is leaking from and fix the leak CAUTIO...

Page 63: ...moothing capacitor C61 C62 C63 R V coil CN721 FUSE F701 T3 15AL250V 220 230 240 V AC X64 LD66B 220 230 240 V AC LD61 LD62 220 230 240 V AC CN601 Serial signal A CN601 Serial signal B CN601 CN602 Output to drive outdoor fan motor CN932 LEV A coil CN724 LEV B coil CN725 20 10 0 10 20 30 40 0 10 20 30 40 50 60 70 80 90 100 Temperature C Defrost thermistor RT61 Ambient temperature thermistor RT65 Outd...

Page 64: ...bar voltage 290 370 V DC 15 V DC CN601 Room A Input Room B Room C LEV 12 V DC pulse wave CN713 Valve coil 220 230 240 V AC Output CN611 Serial signal 12 24 V CN791 LEV Room A CN792 LEV Room B CN793 LEV Room C 15 V 15 V Rotate instruction Constant voltage Rotate signal Pulse wave CN714 Defrost heater 220 230 240 V AC Output Defrost thermistor RT61 CN797 LEV Room R 220 230 240 V AC 0 100 200 300 400...

Page 65: ...tput to drive compressor Connect to earth Connect to reactor Red line Connect to reactor White line CNDC Bus bar voltage 290 370 V DC CNAC1 220 230 240 V AC Output F2 FUSE T6 3AL250V F1 FUSE T6 3AL250V 220 230 240 V AC Input CNAC2 220 230 240 V AC Output Connect to earth CN152 Signal Transmission From Outdoor Control P C board 5 V DC pulse wave CN171 Fin temperature thermistor RT64 MXZ 3HA50VF MXZ...

Page 66: ...hing the locking lever Hold the sleeve and pull out the terminal slowly The terminal which has the locking mechanism can be detached as shown below There are following 2 types 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 Detaching method of the terminal with locking mechanism Connect...

Page 67: ... the cabinet Refer to section 1 2 Disconnect the power supply and indoor outdoor connect ing wire and remove the back panel Refer to section 1 3 Remove the inverter assembly Refer to section 2 4 Remove the R V coil 4 Removing the discharge temperature thermistor defrost thermistor and outdoor heat exchanger temperature thermistor 1 Remove the service panel the top panel and the cabinet Refer to se...

Page 68: ...outdoor connect ing wire and remove the back panel Refer to section 1 3 Remove the inverter assembly Refer to section 2 4 Recover gas from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 kg cm2 0 MPa 5 Detach the brazed part of the suction and the discharge pipe connected with compressor 6 Remove the nuts of compressor legs 7 Remove the compressor 8 Detach ...

Page 69: ...d remove the cabi net 5 Remove the screws of the back panel and remove the back panel Photo 3 69 13 2 MXZ 3HA50VF NOTE Turn OFF the power supply before disassembly Photo 2 Photo 1 Screws of the top panel Screws of the cabinet Screws of the top panel Screws of the cabinet Screws of the cabinet Screws of the sub panel Photo 3 Screw of the rear guard Screws of the back panel Screws of the back panel ...

Page 70: ...C board holder and remove the outdoor control P C board holder 8 Remove the screws of the reactor and remove the reac tor 9 Remove the screws of the reactor bed and remove the reactor bed 10 Remove the screws of the heat sink support and remove the heat sink support 11 Remove the screws fixing the outdoor power P C board 12 Disconnect all connectors and lead wires on the outdoor power P C board 70...

Page 71: ...shows 0 kg cm2 0 MPa 5 Disconnect the outdoor control P C board connectors CN712 CNF1 CNTH1 CNTH2 CN63H CN791 CN792 CN793 CN797 6 Disconnect the compressor lead wire from the terminal of the compressor U V W 7 Remove the screws of the electrical box assembly and remove the electrical box assembly Photo 4 8 Remove the propeller fan 9 Remove the sound proof felt 1 2 NOTE Before removing the sound pr...

Page 72: ...ch the brazed parts of expansion valves and pipes Photo 11 Photo 12 72 HEAD OFFICE TOKYO BUILDING 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Copyright 2018 MITSUBISHI ELECTRIC CORPORATION Issued Feb 2021 No OBH828 REVISED EDITION A Published Dec 2018 No OBH828 Made in Japan Specifications are subject to change without notice Expansion valves LEV coils Defrost thermistor RT61 Ambient temperat...

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