Mitsubishi Electric MXZ-2A20NA-1 Service Manual Download Page 45

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Normal

Discharge temperature
thermistor (RT62)

Fin temperature
thermistor (RT64)

WHT - RED
RED - ORN

Measure the resistance using a tester. (Part temperature : 14˚F ~ 104˚F)

37.4

~ 53.9

Part name

Check method and criterion

1.2k

~ 1.56k

Measure the resistance between terminals using a tester.
(Winding temperature : 14˚F ~ 104˚F)

Compressor

WHT

RED

BLK

LEV

WHT

RED

WHT

BLK

(W)

(V)

(U)

RED

YLW BRN

ORN

BLU

Measure the resistance between lead wires using a tester.
(Part temperature : 14˚F ~ 104˚F)

Outdoor fan motor

R.V. coil

Measure the resistance using a tester.(Part temperature : 14˚F ~ 104˚F)

Linear expansion valve

Color of lead wire

Normal

YLW - BRN

BRN - BLU

Normal (Each phase)

13.4

~ 16.4

Pressure

Normal

HPS

537 ± 22 PSIG

696 PSIG

Open

High pressure switch
(HPS)
MXZ-3A30NA
MXZ-3A30NA -

11-5. Trouble criterion of main parts

MXZ-2A20NA MXZ-2A20NA - MXZ-3A30NA MXZ-3A30NA -

Defrost thermistor
(RT61)

Ambient temperature
thermistor (RT65)

Outdoor heat exchanger
temperature thermistor
(RT68)

Gas pipe temperature
thermistor (RT6A~C)
MXZ-2A20NA
MXZ-3A30NA

Measure the resistance with a tester.

Refer to 11-7. “Test point diagram and voltage”,1. “Outdoor electronic control P.C.
board”, the chart of thermistor.

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

Refer to 11-7. “Test point diagram and voltage”,1. “Outdoor electronic control P.C.
board”, the chart of thermistor.

+ 7

MXZ-2A20NA

Normal (Each phase)

MXZ-2A20NA

0.39

~ 0.49

0.86

Ω

~ 1.06

Ω

MXZ-3A30NA

MXZ-3A30NA -

1.29

~ 1.49

OB444B--2.qxp 07.4.17 4:33 PM Page 45

Summary of Contents for MXZ-2A20NA-1

Page 1: ...PARTS 86 No OB444 REVISED EDITION B SPLIT TYPE HEAT PUMP AIR CONDITIONERS The Slim Line From Mitsubishi Electric 33223 9700058 TM OUTDOOR UNIT MXZ 2A20NA MXZ 2A20NA MXZ 3A30NA MXZ 3A30NA 1 1 MXZ 2A20NA MXZ 2A20NA 1 HFC utilized R410A Indoor unit service manual MSZ A NA Series OB450 Revision B MXZ 2A20NA and MXZ 3A30NA have been added 1 1 NOTE This service manual describes technical data of the out...

Page 2: ...aporation temperature thermistor has been added 10 Ambient temperature thermistor has been added MXZ 2A20NA MXZ 2A20NA 1 Compressor has been changed SNB130FPDH1 SNB130FQBH1 2 Gas pipe temperature thermistor has been removed 3 Pre heat control has been added 4 Electronic control P C board has been changed 5 Power board has been changed MXZ 3A30NA MXZ 3A30NA 1 Ball valve has been changed to stop val...

Page 3: ...rant piping 4 Composition change may occur in R410A since it is a mixed refrigerant When charging charge liquid refrigerant to prevent composition change Refrigeration oil Refrigerant New refrigerant R410A HFC 32 HFC 125 50 50 Pseudo azeotropic refrigerant Not included A1 A1 72 6 60 5 225 82 3 995 Non combustible 0 1730 From liquid phase in cylinder Possible Incompatible oil Non Non Previous refri...

Page 4: ...s Substitutable for R410A No 1 2in and 5 8in 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 New Specification Current Specification The incompatible refrigeration oil easily separates from refrigerant and is in the upper layer inside the suction muffler Raising position of the...

Page 5: ... the gas cylinder If the refrigerant is charged from the gas phase composition change may occur in the refrigerant inside the cylinder and the outdoor unit In this case ability of the refrigeration cycle decreases or normal operation can be impossible However charging the liquid refrigerant all at once may cause the compressor to be locked Thus charge the refrigerant slowly 2 Refrigerant piping 1 ...

Page 6: ...2 MXZ 2A20NA MXZ 2A20NA 1 MXZ 3A30NA Air inlet Drain outlet Back and side Air outlet Air inlet Drain outlet Back and side Air outlet MXZ 3A30NA 1 Air outlet Drain outlet Air inlet Back and side OB444B 1 qxp 07 4 17 4 27 PM Page 6 ...

Page 7: ...B Cooling capacity BTU h Total Power consumption W Current A Power factor 208V 230V MXZ 2A20NA MXZ 2A20NA 09 12 15 09 09 09 12 09 15 12 12 95 95 95 97 97 97 97 4 30 5 40 7 87 8 16 7 98 7 98 7 98 4 76 5 97 8 70 9 02 8 82 8 82 8 82 10 900 12 500 13 750 11 000 10 900 5 200 15 400 13 600 5 200 16 400 18 000 5 200 21 100 21 800 8 500 21 800 22 000 8 500 22 000 22 000 8 500 22 000 22 000 8 500 22 000 94...

Page 8: ...0 26 000 26 000 12 000 26 000 26 000 12 000 26 000 26 000 12 000 26 000 27 000 12 600 27 000 28 400 12 600 28 400 28 400 12 600 28 400 28 400 12 600 28 400 9 000 12 000 15 000 16 200 20 400 12 000 14 500 15 200 13 000 13 800 13 000 9 000 8 500 7 750 7 300 9 000 12 000 15 000 16 200 22 000 9 000 9 000 9 000 9 000 7 600 12 000 11 500 10 800 13 000 12 200 13 000 9 000 8 500 7 750 7 300 Indoor units c...

Page 9: ... 11 000 33 000 27 000 11 000 35 000 27 000 11 000 35 000 27 000 11 000 35 000 27 000 11 000 35 000 27 000 11 000 35 000 27 000 11 000 35 000 27 000 11 000 35 000 27 000 11 000 35 000 27 000 11 000 35 000 28 500 11 400 36 000 28 600 11 400 36 000 28 600 11 400 36 000 28 600 11 400 36 000 10 900 13 600 16 900 17 700 19 700 13 500 15 000 15 800 13 500 14 300 13 500 9 500 8 600 7 800 7 350 1 100 780 1...

Page 10: ...MXZ 2A20NA 1 MXZ 2A20NA MXZ 2A20NA Cooling Heating Mode 1 A Cooling Steady State at rated compressor Speed 3 B 2 Cooling Steady State at rated compressor Speed B 1 Cooling Steady State at minimum compressor Speed Low ambient Cooling Steady State at minimum compressor Speed Intermediate Cooling Steady State At Intermediate compressor Speedw 1 Standard Rating Heating at rated compressor Speed 2 Low ...

Page 11: ...ng Mode 1 A Cooling Steady State at rated compressor Speed 3 B 2 Cooling Steady State at rated compressor Speed B 1 Cooling Steady State at minimum compressor Speed Low ambient Cooling Steady State at minimum compressor Speed Intermediate Cooling Steady State At Intermediate compressor Speedw 1 Standard Rating Heating at rated compressor Speed 2 Low temperature Heating at rated compressor Speed Ma...

Page 12: ... wiring 3 7 8 hole Drain hole 3 1 5 16 Air in Air in Air out Base bolt M10 4 13 32 13 16 Oval hole A unit connection B unit connection 3 8 flared both A B unit Gas pipe 1 4 flared both A B unit Liquid pipe 6 9 16 6 21 32 1 3 16 1 3 16 12 3 4 14 3 16 11 3 4 2 5 8 1 25 32 15 16 8 5 8 5 5 16 11 16 11 16 14 3 16 15 19 32 1 1 2 1 7 32 19 11 16 11 11 32 9 3 16 2 1 2 1 7 32 21 32 1 2 1 3 16 13 1 1 3 16 3...

Page 13: ...ed Liquid pipe C unit connection B unit connection A unit connection Air in Drain hole 3 1 5 16 Air out Air in Base bolt M10 2 U shape notched holes Base bolt M10 2 15 32 1 13 32 Oval hole More than 3 94 in Open as a rule More than 19 69 in if the front and both sides are open More than 3 94 in More than 7 87 in if there are obstacles to both sides Open as a rule More than 19 69 in if the back bot...

Page 14: ...1 2 A unit More than 3 15 16 More than 19 11 16 More than 7 7 8 More than13 25 32 More than 3 15 16 More than 19 11 16 More than 13 25 32 More than 13 25 32 More than 3 15 16 SERVICE SPACE More than 3 15 16 More than 19 11 16 5 3 16 Liquid pipe 1 4 flared 35 7 16 1 3 16 4 3 4 Base bolt M10 Drain hole 3 1 5 16 Note Leave front and both sides clearance fully Note Leave front and overhead clearance f...

Page 15: ...15 WIRING DIAGRAM 6 MXZ 2A20NA OB444B 1 qxp 07 4 17 4 27 PM Page 15 ...

Page 16: ...16 MXZ 2A20NA 1 OB444B 1 qxp 07 4 17 4 28 PM Page 16 ...

Page 17: ...17 MXZ 3A30NA OB444B 1 qxp 07 4 17 4 28 PM Page 17 ...

Page 18: ...18 MXZ 3A30NA 1 OB444B 1 qxp 07 4 17 4 28 PM Page 18 ...

Page 19: ...rmistor W Capillary tube O D 0 14 I D 0 09 19 68 Capillary tube O D 0 98 I D 0 02 39 37 Capillary tube O D 0 16 I D 0 11 3 93 Capillary tube O D 0 16 I D 0 11 3 93 Discharge temperature thermistor RT62 Strainer 100 Strainer 100 R V coil OFF ON Refrigerant flow in cooling Refrigerant flow in heating Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT68 FAN OUT HEX O...

Page 20: ... Outdoor unit union diameter For Liquid 1 4 Indoor unit A Gas 3 8 Liquid 1 4 Indoor unit B Gas 3 8 Unit inch Piping length each indoor unit a b 82ft MAX Total piping length a b 164ft MAX Bending point for each unit 25 MAX Total bending point 60 MAX It does not matter which unit is higher a b Outdoor unit Indoor units 49ft 33ft 49ft MAX REFRIGERANT PIPING LENGTH PIPE SIZE SELECTION MXZ 2A20NA MXZ 2...

Page 21: ...tor RT61 Outdoor heat exchanger temperature thermistor RT68 Ambient temperature thermistor RT65 Strainer 100 Strainer 100 Service port Service port MXZ 3A30NA 1 Unit mm Stop valve with service port Stop valve Power receiver LEV A LEV B LEV C Oil separator Compressor Muffler 4 way valve LEV F Indoor unit C Indoor unit B Indoor unit A Indoor unit A Indoor unit B Indoor unit C Capillary tube O D 0 10...

Page 22: ... unit union diameter For Liquid 1 4 Indoor unit A Gas 1 2 Liquid 1 4 Indoor unit B Gas 3 8 Liquid 1 4 Indoor unit C Gas 3 8 Unit inch Piping length each indoor unit a b c 82ft MAX Total piping length a b c 230ft MAX Bending point for each unit 25 MAX Total bending point 70 MAX It does not matter which unit is higher a c Outdoor unit Indoor units 33ft MXZ 3A30NA 49ft MXZ 3A30NA 33ft b 1 49ft MXZ 3A...

Page 23: ...or multi system Refrigerant charge R410A Intake air temperature Fan speed Airflow Unit Btu h kW kW A A PSIG PSIG F F F F ft F F rpm CFM Heating 22 000 1 78 1 743 8 24 7 45 0 43 0 39 363 101 169 106 40 144 47 43 700 1 640 DB WB Item Model Total Electrical circuit Refrigerant circuit Outdoor unit Cooling 20 000 2 15 2 113 10 08 9 11 0 43 0 39 435 128 190 122 65 146 95 650 1 485 208 230 1 60 25 50 5l...

Page 24: ...ulti system Refrigerant charge R410A Intake air temperature Fan speed Airflow Unit Btu h kW kW A A PSIG PSIG F F F F ft F F rpm CFM Heating 28 600 2 18 2 127 10 15 9 18 0 43 0 39 330 96 150 100 30 125 47 43 600 1 605 DB WB Item Model Total Electrical circuit Refrigerant circuit Outdoor unit Cooling 28 400 3 25 3 197 15 45 13 97 0 43 0 39 506 136 190 132 48 146 95 520 1 365 MXZ 3A30NA MXZ 3A30NA 20...

Page 25: ...ambient Cooling Steady State at minimum compressor Speed Intermediate Cooling Steady State At Intermediate compressor Speedw Standard Rating Heating at rated compressor Speed Low temperature Heating at rated compressor Speed Max temperature Heating at minimum compressor Speed High temperature Heating at minimum compressor Speed Frost Accumulation at rated compressor Speed Frost Accumulation at Int...

Page 26: ...ow should be set at MAX 3 MAIN READINGS 1 Indoor intake air wet bulb temperature FWB 2 Indoor outlet air wet bulb temperature FWB 3 Outdoor intake air dry bulb temperature FDB 4 Total input W 5 Indoor intake air dry bulb temperature FDB 6 Outdoor intake air wet bulb temperature FWB 7 Total input W Indoor air wet dry bulb temperature difference on the left side of the following chart shows the diff...

Page 27: ...and defrost operation 09 class 45Hz 12 class 56Hz 15 class 75Hz 14 23 32 41 50 59 14 23 32 41 50 59 Indoor unit class Inverter output frequency Indoor air DB temperature difference degree Indoor intake air Dry bulb temperature F Outdoor intake air Wet bulb temperature F Outdoor intake air Wet bulb temperature F Indoor intake air Dry bulb temperature F 24 0 22 2 20 3 18 5 16 6 14 8 12 9 11 1 26 1 2...

Page 28: ...5 1 0 1 5 2 0 0 50 100 0 5 1 0 1 5 2 0 0 50 100 0 5 1 0 1 5 2 0 COOL Capacity Frequency Hz Frequency COOL Total input Hz HEAT Capacity Frequency Hz Frequency HEAT Total input Hz COOL Capacity Frequency Hz Frequency COOL Total input Hz HEAT Capacity Frequency Hz Frequency HEAT Total input Hz COOL Capacity Frequency Hz Frequency COOL Total input Hz HEAT Capacity Frequency Hz Frequency HEAT Total inp...

Page 29: ...y Hz Frequency COOL Total input Hz HEAT Capacity Frequency Hz Frequency HEAT Total input Hz COOL Capacity Frequency Hz Frequency COOL Total input Hz HEAT Capacity Frequency Hz Frequency HEAT Total input Hz COOL Capacity Frequency Hz Frequency COOL Total input Hz HEAT Capacity Frequency Hz Frequency HEAT Total input Hz 1 09 class unit in single operation 2 12 class unit in single operation 3 15 cla...

Page 30: ... 2 0 3 0 4 0 5 0 6 0 7 0 Ambient temperature F Outdoor low pressure Outdoor unit current A Outdoor unit current A 45Hz PSIG 33Hz 33Hz 65 75 70 86 80 75 70 Indoor DB temperature F Indoor DB temperature F How to work fixed frequency operation 1 Set emergency switch to COOL or HEAT The switch is locat ed on indoor unit 2 Press emergency run ON OFF button 3 Compressor starts running at 33Hz COOL or 45...

Page 31: ...ure F Indoor DB temperature F Indoor DB temperature F 2Air flow speed High 3Inverter output frequency 33Hz 2 HEAT operation 1Data is based on the condition of indoor humidity 50 How to work fixed frequency operation 1 Set emergency switch to COOL or HEAT The switch is locat ed on indoor unit 2 Press emergency run ON OFF button 3 Compressor starts running at 33Hz COOL or 45Hz HEAT 4 Indoor fan runs...

Page 32: ...or DB temperature F Indoor DB temperature F Indoor DB temperature F 2 HEAT operation How to work fixed frequency operation 1 Set emergency switch to COOL or HEAT The switch is locat ed on indoor unit 2 Press emergency run ON OFF button 3 Compressor starts running at 33Hz COOL or 45Hz HEAT 4 Indoor fan runs at High speed 5 To cancel this operation press emergency run ON OFF button or any button on ...

Page 33: ...Ambient temperature F Outdoor low pressure Outdoor unit current A Outdoor unit current A 45Hz PSIG 33Hz 33Hz 65 75 70 86 80 75 70 Indoor DB temperature F Indoor DB temperature F How to work fixed frequency operation 1 Set emergency switch to COOL or HEAT The switch is locat ed on indoor unit 2 Press emergency run ON OFF button 3 Compressor starts running at 33Hz COOL or 45Hz HEAT 4 Indoor fan runs...

Page 34: ...ure F Indoor DB temperature F Indoor DB temperature F 2Air flow speed High 3Inverter output frequency 33Hz 2 HEAT operation 1Data is based on the condition of indoor humidity 50 How to work fixed frequency operation 1 Set emergency switch to COOL or HEAT The switch is locat ed on indoor unit 2 Press emergency run ON OFF button 3 Compressor starts running at 33Hz COOL or 45Hz HEAT 4 Indoor fan runs...

Page 35: ...or DB temperature F Indoor DB temperature F Indoor DB temperature F 2 HEAT operation How to work fixed frequency operation 1 Set emergency switch to COOL or HEAT The switch is locat ed on indoor unit 2 Press emergency run ON OFF button 3 Compressor starts running at 33Hz COOL or 45Hz HEAT 4 Indoor fan runs at High speed 5 To cancel this operation press emergency run ON OFF button or any button on ...

Page 36: ...5 120 130 140 150 160 170 Ambient temperature F F 86 80 75 70 86 80 75 70 15 20 25 30 35 40 45 50 55 60 65 70 75 2 0 3 0 4 0 5 0 6 0 7 0 Ambient temperature F 65 70 75 80 85 90 95 100 105 110 115 0 0 1 0 2 0 3 0 4 0 5 0 6 0 Ambient temperature F F F PSIG Outdoor low pressure Outdoor unit current A Outdoor unit current A 45Hz 33Hz 33Hz 65 70 75 Indoor DB temperature F Indoor DB temperature F Indoor...

Page 37: ...ature F Indoor DB temperature F Indoor DB temperature F 86 80 75 70 2 HEAT operation How to work fixed frequency operation 1 Set emergency switch to COOL or HEAT The switch is locat ed on indoor unit 2 Press emergency run ON OFF button 3 Compressor starts running at 33Hz COOL or 45Hz HEAT 4 Indoor fan runs at High speed 5 To cancel this operation press emergency run ON OFF button or any button on ...

Page 38: ...tart up of the compressor To improve start up condition the compressor is energized even while it is not operating This is to generate heat at the winding The compressor uses about 50 W when pre heat control is turned ON Pre heat control is ON at initial setting How to deactivate pre heat control 1 Turn OFF the power supply for the air conditioner before making the setting 2 Set the 4th Dip Switch...

Page 39: ...it after the auto line correcting is finished Pressing the switch during detection cancels this function SW871 W Be sure to check for closed valves cracked pipes or clogged pipes LED indication after cancel LED1 Red Lighting LED indication during detection LED indication after detection LED2 Yellow Lighting LED3 Green Blinking LED1 Red Lighting LED2 Yellow Lighting LED3 Green Goes out LED1 Red Lig...

Page 40: ...oothing capacitor 4 When removing the electronic control P C board hold the edge of the board with care NOT to apply stress on the components 5 When connecting or disconnecting the connectors hold the housing of the connector DO NOT pull the lead wires MXZ 2A20NA MXZ 2A20NA MXZ 3A30NA MXZ 3A30NA 1 1 11 2 Failure mode recall function This air conditioner can memorize the abnormal condition which ha...

Page 41: ...ligent power module When discharge temperature exceeds 240 8 F during operation Compressor can restart if discharge temperature thermistor reads 212 F or less 3 minutes later When high pressure is detected with the high pressure switch HPS during operation MXZ 3A30 When the outdoor heat exchanger temperature exceeds 158 F during cooling or the indoor gas pipe temperature exceeds 158 F during heati...

Page 42: ...on between boards protection stop is continuously performed twice Communication error occurs between the electronic control P C board and power board for more than 10 seconds Current sensor protection stop is continuously performed twice When a short or open circuit is detected in the current sensor during compressor operating The protection stop of the zero cross detecting circuit is continuously...

Page 43: ...mes Goes out Outdoor fan motor Refer to 11 6 G 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 wire between outdoor electronic control P C board and power board Lighting 12 times Zero cross detecting circuit protection Check the connecting wire among outdoor electronic c...

Page 44: ...is kept under 122 F COOL mode 104 F HEAT mode for more than 40 minutes When the frequency of the compressor is kept 80Hz or more and the discharge temperature is kept under 102 2 F for more than 20 minutes When the outdoor heat exchanger temperature exceeds 136 4 F during operation 9 times Lighting Inverter check mode Lighting Lighting Normal When the unit is operated with emergency operation swit...

Page 45: ...4 Pressure Normal HPS 537 22 PSIG 696 PSIG Open Close High pressure switch HPS MXZ 3A30NA MXZ 3A30NA 1 11 5 Trouble criterion of main parts MXZ 2A20NA MXZ 2A20NA MXZ 3A30NA MXZ 3A30NA 1 1 Defrost thermistor RT61 Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT68 Gas pipe temperature thermistor RT6A C MXZ 2A20NA MXZ 3A30NA Measure the resistance with a tester Ref...

Page 46: ...er supply terminal block Is the output voltage from the noise filter P C board 208 230V AC Is the input voltage to the outdoor electronic control P C board 294 325V DC Check the power supply cable Replace the outdoor electronic control P C board Replace the noise filter P C board Is the input voltage to the power board 208 230V AC Replace the reactor 11 6 Troubleshooting flow MXZ 2A20NA MXZ 2A20NA...

Page 47: ...he terminal block 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 No Replace the indoor outdoor connecting wire Replace the indoor outdoor connecting wire Is serial signal error indicated 6 minutes later Yes No Turn OFF inverter controlled lighting equipment Turn OFF the power supply and then turn ON...

Page 48: ... 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 208 230V AC between pin1 and pin 2 at connector CN912 W 1 Turn OFF the power supply of the indoor and the outdoor unit and disconnect the connector CN781 2 3 minutes after turning ON the power supply start EMERGENCY OPERATION in COOL mo...

Page 49: ...vibration of LEV coil with your hand Disconnect the connectors CN791 LEV A CN792 LEV B CN793 LEV C CN795 LEV E CN796 LEV F Is there normal resistance to LEV coil Normal Replace the outdoor electronic control P C board Replace LEV coil When cooling heat exchanger of non operating indoor unit frosts When heating non operating indoor unit get warm OB444B 2 qxp 07 4 17 4 33 PM Page 49 ...

Page 50: ...K Output voltage COOL 150V 48Hz HEAT 170V 64Hz Is voltage output W1 W2 Turn OFF the power supply of indoor and outdoor unit and measure the compressor winding resistance between the compressor terminals Is the resistance between each terminal normal Is the input voltage to the outdoor electronic control P C board 370V or more Reconnect the lead wire of compressor and turn ON the power supply to in...

Page 51: ... control P C board and turn ON the power supply Rotate the outdoor fan motor manually and measure the voltage of CN931 Between 1 and 5 Between 2 and 5 Between 3 and 5 Is the resistance between each terminal of outdoor fan motor normal Does the outdoor fan motor rotate smoothly Does the voltage between each terminal become 5V DC and 0V DC repeatedly Replace the outdoor DC fan motor Replace the outd...

Page 52: ... cases Indoor unit does not operate different operating models in multi system When you try to run two indoor units simultaneously one for cooling and the other for heating the unit which transmits signal to the outdoor units earlier decides the operation mode When the above situation occurs set all the indoor units to the same mode turn OFF the indoor units and then turn them back ON Though the t...

Page 53: ...ressure switch Gas pipe C thermistor w Gas pipe B thermistor w Gas pipe A thermistor w CN932 20 90V AC GND 5V 5V DC pulse wave To fan motor Defrost thermistor RT61 Discharge temperature thermistor RT62 Outdoor heat exchanger temperature thermistor RT68 Rush current relay R V coil 12V DC 15V 15V CN931 CN661 CN701 Signal transmission To power board 5V DC pulse wave GND CN702 Signal reception From po...

Page 54: ...V AC GND 5V DC 5V DC pulse wave To fan motor Rush current relay R V coil CN781 CN663 CN701 CN702 CN661 CN681 High pressure switch CN801 294 370 V DC Input LED 3 Serial signal Room A 12 24V DC CN611 Serial signal Room B 12 24V DC CN621 Serial signal Room C 12 24V DC CN601 208 230V AC Input SW1 SW2 SW871 F801 FUSE T3 15AL250V CN791 LEV Room A CN792 LEV Room B CN793 LEV Room C CN796 LEV F 12VDC pulse...

Page 55: ...FUSE T1AL250V 2 Noise filter P C board CN902 To power board CN903 To power board 208 230V AC Output NR64 VARISTOR MXZ 3A30NA 1 208 230V AC Output F64 FUSE T2AL250V CN901 To electronic control P C board CN912 R V coil 208 230V AC CN902 To power board CN903 To power board 208 230V AC Input F65 FUSE T6 3AL250V 208 230V AC Output OB444B 2 qxp 07 4 17 4 33 PM Page 55 ...

Page 56: ...5V 7 5 15V Signal reception From electronic control P C board 5V DC pulse wave CN3 Fin temperature thermistor RT64 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 Zero cross signal 3 4 Not...

Page 57: ...rigerant gas 3 Remove the screws of the cabinet and remove the cabinet 4 Remove the screws of the back panel and remove the back panel Photo 3 5 Disconnect the compressor lead wire from terminal of the compressor U V W 6 Disconnect the outdoor electronic control P C board connectors CN661 CN662 MXZ 2A20NA CN663 CN791 CN792 CN795 CN931 CN932 Disconnect the noise filter P C board connector CN912 7 R...

Page 58: ...ller 4 Remove the fan motor Photo 6 Screws of the outdoor fan motor Propeller Propeller nut Separator Sound proof felt Photo 3 Screw of the rear guard Screws of the back panel Screws of the back panel Screws of the back panel Screws of the electrical parts R V coil 4 way valve LEV coil E Expansion valve E Suction pipe welded part Discharge pipe welded part Photo 4 Photo 5 Compressor nuts OB444B 2 ...

Page 59: ...k panel Photo 1 2 3 Recover refrigerant gas 3 Remove the electrical parts Photo 4 4 Detach the welded parts of 4 way valve and pipe 4 Removing the expansion valve 1 Remove the top panel Photo 1 2 Remove the service panel the cabinet and the back panel Photo 1 2 3 Gas recovery is not required if the unit is pumped down 3 Remove the cabinet for removing LEV E Photo 1 2 5 4 Remove the electrical part...

Page 60: ... CN931 CN932 Disconnect the noise filter P C board connector CN912 6 Remove the screws of the electrical parts and remove the electrical parts Photo 2 7 Remove the propeller 8 Remove the screws of the separator and remove the separator 9 Remove the sound proof felt 10 Detach the welded parts of the compressor suction and dis charge pipes Photo 3 11 Remove the compressor nuts and remove the compres...

Page 61: ...nt panel for removing LEV E Photo 1 3 4 Remove the electrical parts for removing LEV E Photo 2 3 5 Remove the LEV coils 6 Detach the welded parts of expansion valves and pipes 4 way valve R V coil Welded parts Photo 5 Photo 6 2 Removing the fan motor 1 Remove the top panel the service panel and the front panel Photo 1 2 Disconnect the connectors CN931 and CN932 on the outdoor electronic control P ...

Page 62: ...E PHOTOS 5 Removing the reactor 1 Remove the top panel Photo 1 2 Disconnect the reactor lead wire 3 Remove the screws of the reactor and remove the reactor Photo 7 Screws of the reactor OB444B 3 qxp 07 4 17 1 40 PM Page 62 ...

Page 63: ...isconnect the noise filter P C board connector CN912 7 Remove the screws of the electrical parts and remove the electrical parts 8 Remove the propeller 9 Remove the screws of the separator and remove the separator 10 Remove the sound proof felt 11 Detach the welded parts of the compressor suction and dis charge pipes Photo 4 12 Remove the compressor nuts and remove the compressor Photo 1 Photo 2 1...

Page 64: ...ront panel for removing LEV F Photo 1 4 Remove the electrical parts for removing LEV F Photo 3 5 Remove the LEV coils 6 Detach the welded parts of expansion valves and pipes LEV coils Expansion valves Photo 7 2 Removing the fan motor 1 Remove the top panel the service panel and the front panel Photo 1 2 2 Disconnect the connectors CN931 and CN932 on the outdoor electronic control P C board 3 Remov...

Page 65: ... PHOTOS 5 Removing the reactor 1 Remove the top panel Photo 1 2 2 Disconnect the reactor lead wire 3 Remove the screws of the reactor and remove the reactor Photo 8 Screws of the reactor OB444B 3 qxp 07 4 17 1 41 PM Page 65 ...

Page 66: ...66 PARTS LIST non RoHS compliant 13 MXZ 2A20NA 13 1 OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS 3 2 1 4 11 19 20 21 22 5 6 7 8 9 10 12 13 14 15 16 17 18 23 OB444B 3 qxp 07 4 17 1 41 PM Page 66 ...

Page 67: ...RUBBER SET EXPANSION VALVE LEV COIL EXPANSION VALVE LEV COIL BASE UNION GAS UNION LIQUID BACK PANEL SERVICE PANEL BALL VALVE GAS BALL VALVE LIQUID POWER RECEIVER EXPANSION VALVE LEV COIL 4 WAY VALVE TOP PANEL REAR GUARD HEAT EXCHANGER MOTOR SUPPORT SERVICE PORT CAPILLARY TUBE CAPILLARY TUBE CAPILLARY TUBE OIL SEPARATOR No MC LEV B LEV A LEV E 1 1 1 1 3 1 1 1 1 1 2 2 1 1 1 1 1 1 1 1 1 1 1 1 2 8 2 1...

Page 68: ...68 10 9 8 1 2 4 3 5 7 12 6 MXZ 2A20NA 13 2 OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS 11 PARTS LIST non RoHS compliant OB444B 3 qxp 07 4 17 1 41 PM Page 68 ...

Page 69: ...C CONTROL P C BOARD NOISE FILTER P C BOARD TERMINAL BLOCK TERMINAL BLOCK GAS PIPE TEMPERATURE THERMISTOR SET R V COIL THERMISTOR SET AMBIENT TEMPERATURE THERMISTOR REACTOR No MF TB2 3 TB1 RT6A B 21S4 RT61 62 68 RT65 L 1 1 1 1 1 2 1 1 1 1 1 1 RC0J60 Including heat sink and RT64 Indoor unit connecting Power supply 20A 600µH DEFROST DISCHARGE OUTDOOR HEAT EXCHANGER MXZ 2A20NA 13 2 OUTDOOR UNIT FUNCTI...

Page 70: ...70 MXZ 3A30NA 13 3 OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS 3 2 1 4 13 15 21 23 24 25 5 6 12 11 7 8 9 10 17 14 18 19 22 16 20 PARTS LIST non RoHS compliant OB444B 3 qxp 07 4 17 1 41 PM Page 70 ...

Page 71: ...PANSION VALVE LEV COIL EXPANSION VALVE LEV COIL EXPANSION VALVE LEV COIL BASE ASSEMBLY UNION PIPE COVER BALL VALVE LIQUID 3 8 BALL VALVE GAS 5 8 REAR PANEL POWER RECEIVER 4 WAY VALVE HIGH PRESSURE SWITCH EXPANSION VALVE LEV COIL TOP PANEL REAR GUARD HEAT EXCHANGER SIDE PANEL SERVICE PORT CAPILLARY TUBE CAPILLARY TUBE CAPILLARY TUBE OIL SEPARATOR No MC LEV C LEV B LEV A HPS LEV E 1 2 1 1 1 3 1 1 1 ...

Page 72: ...72 11 10 9 1 2 4 3 5 6 8 7 MXZ 3A30NA 13 4 OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS 12 PARTS LIST non RoHS compliant OB444B 3 qxp 07 4 17 1 41 PM Page 72 ...

Page 73: ...IC CONTROL P C BOARD REACTOR NOISE FILTER P C BOARD TERMINAL BLOCK TERMINAL BLOCK GAS PIPE TEMPERATURE THERMISTOR R V COIL THERMISTOR SET AMBIENT TEMPERATURE THERMISTOR No MF L TB2 4 TB1 RT6A B C 21S4 RT61 62 68 RT65 1 1 1 1 1 1 3 1 1 1 1 1 RC0J60 Indoor unit connecting Including heat sink and RT64 Power supply DEFROST DISCHARGE OUTDOOR HEAT EXCHANGER 20A 600µH MXZ 3A30NA 13 4 OUTDOOR UNIT FUNCTIO...

Page 74: ...S PARTS LIST RoHS compliant 14 MXZ 2A20NA MXZ 2A20NA 14 1 OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS 1 3 2 1 4 11 19 20 21 22 5 6 7 8 9 10 12 13 14 15 16 17 18 23 OB444B 3 qxp 07 4 17 1 41 PM Page 74 ...

Page 75: ...SE UNION GAS UNION GAS UNION LIQUID UNION LIQUID BACK PANEL SERVICE PANEL BALL VALVE GAS BALL VALVE LIQUID POWER RECEIVER POWER RECEIVER EXPANSION VALVE LEV COIL 4 WAY VALVE TOP PANEL REAR GUARD HEAT EXCHANGER MOTOR SUPPORT SERVICE PORT CAPILLARY TUBE CAPILLARY TUBE CAPILLARY TUBE OIL SEPARATOR No G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G RoHS MC MC LEV B LEV A LEV E 1 1 1 ...

Page 76: ...76 10 9 8 1 2 4 3 5 7 12 6 11 RoHS PARTS LIST RoHS compliant MXZ 2A20NA MXZ 2A20NA 14 2 OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS 1 OB444B 3 qxp 07 4 17 1 41 PM Page 76 ...

Page 77: ...OL P C BOARD NOISE FILTER P C BOARD TERMINAL BLOCK TERMINAL BLOCK GAS PIPE TEMPERATURE THERMISTOR SET R V COIL THERMISTOR SET AMBIENT TEMPERATURE THERMISTOR REACTOR No G G G G G G G G G G G G G G RoHS MF TB2 3 TB1 RT6A B 21S4 RT61 62 68 RT65 L 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 RC0J60 Including heat sink and RT64 Including heat sink and RT64 Indoor unit connecting Power supply 20A 600µH...

Page 78: ...8 MXZ 3A30NA 14 3 OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS 3 2 1 4 13 15 21 23 24 25 5 6 12 11 7 8 9 10 17 14 18 19 22 16 20 RoHS PARTS LIST RoHS compliant OB444B 3 qxp 07 4 17 1 41 PM Page 78 ...

Page 79: ... VALVE LEV COIL EXPANSION VALVE LEV COIL BASE ASSEMBLY UNION PIPE COVER BALL VALVE LIQUID 3 8 BALL VALVE GAS 5 8 REAR PANEL POWER RECEIVER 4 WAY VALVE HIGH PRESSURE SWITCH EXPANSION VALVE LEV COIL TOP PANEL REAR GUARD HEAT EXCHANGER SIDE PANEL SERVICE PORT CAPILLARY TUBE CAPILLARY TUBE CAPILLARY TUBE OIL SEPARATOR No G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G G RoHS MC LEV C LEV...

Page 80: ...80 11 10 9 1 2 4 3 5 6 8 7 MXZ 3A30NA 14 4 OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS 12 RoHS PARTS LIST RoHS compliant OB444B 3 qxp 07 4 17 1 41 PM Page 80 ...

Page 81: ... C BOARD REACTOR NOISE FILTER P C BOARD TERMINAL BLOCK TERMINAL BLOCK GAS PIPE TEMPERATURE THERMISTOR R V COIL THERMISTOR SET AMBIENT TEMPERATURE THERMISTOR No G G G G G G G G G G G G RoHS MF L TB2 4 TB1 RT6A B C 21S4 RT61 62 68 RT65 1 1 1 1 1 1 3 1 1 1 1 1 RC0J60 Indoor unit connecting Including heat sink and RT64 Power supply DEFROST DISCHARGE OUTDOOR HEAT EXCHANGER 20A 600µH MXZ 3A30NA 14 4 OUT...

Page 82: ...82 MXZ 3A30NA 14 5 OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS 1 3 2 1 23 4 2 19 20 21 22 5 6 11 10 7 8 9 13 12 16 17 15 18 14 RoHS PARTS LIST RoHS compliant OB444B 3 qxp 07 4 17 1 41 PM Page 82 ...

Page 83: ... 0A2 290 M21 0A2 644 M21 0A2 668 M21 0A6 667 M21 0A2 248 T2W L7V 642 M21 L2V 646 M21 L2V 402 M21 0A2 652 M21 L2V 297 M21 0A2 523 T2W 0A6 630 M21 L2V 249 T2W L7V 641 T2W L7V 959 M21 0A2 937 M21 0A2 936 M21 L2V 938 T2W L7V 656 FRONT PANEL HANDLE ASSEMBLY GRILLE SERVICE PANEL COMPRESSOR COMPRESSOR RUBBER SET EXPANSION VALVE LEV COIL EXPANSION VALVE LEV COIL EXPANSION VALVE LEV COIL BASE ASSEMBLY UNIO...

Page 84: ...84 10 9 1 2 4 3 5 6 8 7 MXZ 3A30NA 14 6 OUTDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS 1 11 RoHS PARTS LIST RoHS compliant OB444B 3 qxp 07 4 17 1 41 PM Page 84 ...

Page 85: ...R FAN MOTOR POWER BOARD ELECTRONIC CONTROL P C BOARD REACTOR NOISE FILTER P C BOARD TERMINAL BLOCK TERMINAL BLOCK R V COIL THERMISTOR SET AMBIENT TEMPERATURE THERMISTOR No G G G G G G G G G G G RoHS MF L TB2 4 TB1 21S4 RT61 62 68 RT65 1 1 1 1 1 1 3 1 1 1 1 PM8H60 Indoor unit connecting Including heat sink and RT64 Power supply DEFROST DISCHARGE OUTDOOR HEAT EXCHANGER 20A 600µH MXZ 3A30NA 14 6 OUTD...

Page 86: ... 5 32 1 4 1 4 32 3 4 15 3 16 Punched hole Punched hole 3 16 1 4 3 16 1 4 MAC 855SG Model name Model code 1 1 Applied unit MAC 889SG 506 889 MXZ 2A20NA MXZ 2A20NA MAC 855SG 51H 855 MXZ 3A30NA MXZ 3A30NA 1 1 MXZ 2A20NA MXZ 2A20NA MXZ 3A30NA MXZ 3A30NA Model name Connected pipes diameter Length A Length B Length C MAC A454JP 3 8 1 2 3 8 1 2 2 72 PAC SG76RJ E 3 8 5 8 4 5 8 3 8 PAC 493PI 1 4 3 8 2 38 3...

Page 87: ...87 OB444B 3 qxp 07 4 17 1 41 PM Page 87 ...

Page 88: ...I ELECTRIC ENGINEERING CO LTD Distributed in May 2007 No OB444 REVISED EDITION B 9 Distributed in Jun 2006 No OB444 REVISED EDITION A 8 Distributed in Mar 2006 No OB444 8 Made in Japan New publication effective May 2007 Specifications subject to change without notice OB444B 3 qxp 07 4 18 4 38 PM Page 88 ...

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Mitsubishi Electric MXZ-2A20NA-1, Service Manual

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