Mitsubishi Electric MSZ-WR NA Series Service Manual Download Page 11

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REFRIGERANT SYSTEM DIAGRAM

Unit: Inch (mm)

Flared connection

Discharge

temperature

thermistor

RT62

Flared connection

Stop valve

(with strainer)

Stop valve

(with service port)

Compressor

4-way valve

Refrigerant pipe ø3/8 (ø9.52)

(with heat insulator)

Refrigerant pipe ø1/4 (ø6.35)

(with heat insulator)

R.V. coil

heating ON

cooling OFF

Strainer

#100

LEV

Muffler

Capillary tube

O.D. 0.118 × I.D. 0.055

× 10-1/4

(ø3.0 × ø1.4 × 260)

Muffler

Service port

Outdoor

heat

exchanger

Defrost

thermistor

RT61

Ambient

temperature

thermistor

RT65

Outdoor heat

exchanger

temperature

thermistor

RT68

Refrigerant flow in cooling
Refrigerant flow in Heating

MUZ-WR09NA MUZ-WR12NA

Outdoor

heat

exchanger

Flared connection

Defrost

thermistor

RT61

Discharge

temperature

thermistor

RT62

Flared connection

Stop valve

(with strainer)

Compressor

4-way valve

Refrigerant pipe ø1/4 (ø6.35)

(with heat insulator)

R.V. coil

heating ON

cooling OFF

Strainer

#100

LEV

Ambient

temperature

thermistor

RT65

Muffler

Capillary tube

O.D. 0.157 ×

I.D. 0.094 × 9-7/16

(ø4.0 × ø2.4 × 240)

Outdoor heat

exchanger

temperature

thermistor

RT68

Capillary tube

O.D. 0.118 ×

I.D. 0.079 × 8-9/32

(ø3.0 × ø2.0 × 210)

Service

port

Service

port

Refrigerant pipe ø1/2 (ø12.7)

(with heat insulator)

Stop valve

(with service port)

Muffler

Refrigerant flow in cooling
Refrigerant flow in Heating

MUZ-WR18NA

OBH819A

Summary of Contents for MSZ-WR NA Series

Page 1: ... service manual MSZ WR NA Series OBH818 CONTENTS 1 TECHNICAL CHANGES 2 2 PART NAMES AND FUNCTIONS 3 3 SPECIFICATION 4 4 OUTLINES AND DIMENSIONS 7 5 WIRING DIAGRAM 9 6 REFRIGERANT SYSTEM DIAGRAM 11 7 DATA 14 8 ACTUATOR CONTROL 24 9 SERVICE FUNCTIONS 25 10 TROUBLESHOOTING 26 11 DISASSEMBLY INSTRUCTIONS 50 OUTDOOR UNIT OBH819 is void Revision A 7 DATA has been corrected ...

Page 2: ...sed 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 1 TECHNICAL CHANGES MUZ WR09NA U1 MUZ WR12NA U1 MUZ WR18NA U1 MUZ WR24NA U1 1 New model Revision A 7 DATA has been corrected OBH819A ...

Page 3: ... WR24NA Piping Air outlet Drain outlet Air inlet back and side Drain hose PART NAMES AND FUNCTIONS 2 MUZ WR09NA MUZ WR12NA MUZ WR18NA Air outlet Drain outlet Piping Drain hose Air inlet back and side OBH819A ...

Page 4: ...Refrigeration oil fl oz L Model 9 1 0 27 FV50S Refrigerant control Linear expansion valve Sound level 1 Cooling dB A 48 51 Heating dB A 50 51 Airflow High Med Low Cooling CFM 1 063 1 063 1 063 Heating CFM 1 282 1 105 1 105 Fan speed High Med Low Cooling rpm 740 740 740 Heating rpm 890 770 770 Defrost method Reverse cycle Dimensions W in 31 1 2 D in 11 1 4 H in 21 5 8 Weight Ib 73 External finish M...

Page 5: ...rol Linear expansion valve Sound level 1 Cooling dB A 53 57 Heating dB A 51 55 Airflow High Med Low Cooling CFM 1 102 1 102 639 1 742 1 742 922 Heating CFM 1 186 1 045 1 045 1 691 1 691 1 372 Fan speed High Med Low Cooling rpm 810 810 490 840 840 450 Heating rpm 870 770 770 810 810 650 Defrost method Reverse cycle Dimensions W in 31 1 2 33 1 16 D in 11 1 4 13 H in 21 5 8 34 5 8 Weight Ib 81 121 Ex...

Page 6: ...sor speed 70 60 17 15 H0 1 Heating steady state at minimum compressor speed 70 60 62 56 5 H1 1 Heating steady state at minimum compressor speed 70 60 47 43 H2 V Heating at Intermediate compressor speed 5 70 60 35 33 5 At intermediate compressor speed Rated compressor speed minimum compressor speed 3 minimum compressor speed 3 4 2 OPERATION Mode Condition Intake air temperature F Indoor Outdoor DB ...

Page 7: ...more 2 4 in 100 mm or more Liquid refrigerant pipe joint Refrigerant pipe flared Ø 1 4 Gas refrigerant pipe joint Refrigerant pipe flared Ø 3 8 WR09 12 Ø 1 2 WR18 REQUIRED SPACE clear 1 1 4 in 100 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 holes OBH819A ...

Page 8: ...2 6 1 2 7 11 16 3 5 4 4 Liquid refrigerant pipe joint Refrigerant pipe flared Ø 3 8 Gas refrigerant pipe joint Refrigerant pipe flared Ø 5 8 1 20 in 500 mm or more when front and sides of the unit are clear 14 in 350 mm or more 4 in 100 mm or more REQUIRED SPACE Clear 1 4 in 100 mm or more 20 in 500 mm or more 2 2 When any 2 sides of left right and rear of the unit are clear OBH819A ...

Page 9: ...9 5 WIRING DIAGRAM MUZ WR09NA MUZ WR12NA MUZ WR18NA OBH819A ...

Page 10: ...10 MUZ WR24NA OBH819A ...

Page 11: ...re thermistor RT68 Refrigerant flow in cooling Refrigerant flow in Heating MUZ WR09NA MUZ WR12NA Outdoor heat exchanger Flared connection Defrost thermistor RT61 Discharge temperature thermistor RT62 Flared connection Stop valve with strainer Compressor 4 way valve Refrigerant pipe ø1 4 ø6 35 with heat insulator R V coil heating ON cooling OFF Strainer 100 LEV Ambient temperature thermistor RT65 M...

Page 12: ...gerant flow in cooling Compressor 4 way valve Refrigerant flow in heating Refrigerant pipe ø5 8 ø15 88 with heat insulator Refrigerant pipe ø3 8 ø9 52 with heat insulator LEV R V coil heating ON cooling OFF Muffler with 100 mesh strainer Strainer 100 Outdoor heat exchanger temperature thermistor RT68 Strainer 100 Muffler Capillary tube O D 0 118 I D 0 079 7 7 8 ø3 0 ø2 0 200 4 Stop valve with serv...

Page 13: ...piping exceeding 25 ft requires additional refrigerant charge according to the calculation Model Outdoor unit precharged Refrigerant piping length one way ft 25 30 40 50 60 65 MUZ WR09NA MUZ WR12NA 1 lb 12 oz 0 1 08 3 24 5 40 7 56 8 64 MUZ WR18NA 2 lb 10 oz Calculation X oz 1 08 5 oz ft Refrigerant piping length ft 25 Model Outdoor unit precharged Refrigerant piping length one way ft 25 30 40 50 6...

Page 14: ... 13 4 1 81 17 2 12 5 1 90 15 8 11 5 1 98 67 20 0 17 2 1 44 18 6 16 0 1 59 17 2 14 8 1 72 16 0 13 8 1 82 14 7 12 6 1 91 63 18 7 18 6 1 38 17 4 17 3 1 52 16 2 16 1 1 64 14 7 14 6 1 75 13 4 13 3 1 82 MUZ WR24NA 71 27 6 20 0 2 50 25 8 18 7 2 74 24 2 17 6 2 95 22 5 16 4 3 11 20 7 15 0 3 23 67 26 1 22 4 2 36 24 3 20 9 2 60 22 5 19 4 2 81 20 9 18 0 2 98 19 2 16 5 3 12 63 24 5 24 4 2 25 22 7 22 6 2 49 21 ...

Page 15: ... 1 2 00 18 9 2 35 22 5 2 61 25 4 2 75 26 1 2 79 29 6 2 89 70 12 4 1 51 16 0 1 93 19 5 2 29 23 0 2 55 26 0 2 68 26 8 2 73 30 3 2 84 65 13 0 1 45 16 4 1 85 20 4 2 21 23 8 2 48 26 8 2 61 27 6 2 65 30 9 2 79 NOTE 1 IDB Intake air dry bulb temperature TC Total Capacity x103 Btu h TPC Total Power Consumption kW 2 Above data is for heating operation without any frost How to operate with fixed operational...

Page 16: ... 1 4 1 5 Indoor intake air WB temperature F SHF at rating condition 0 77 399 CFM Airflow Outdoor intake air DB temperature F Total power consumption kW MUZ WR09NA MUZ WR12NA MUZ WR24NA MUZ WR18NA 71 67 63 65 75 85 95 105 115 1 8 2 0 2 2 2 4 2 6 2 8 3 0 3 2 Indoor intake air WB temperature F SHF at rating condition 0 89 702 CFM Airflow Outdoor intake air DB temperature F Total power consumption kW ...

Page 17: ... 2 6 2 9 3 2 Indoor intake air DB temperature F 702 CFM Airflow Outdoor intake air WB temperature F Total power consumption kW MUZ WR09NA MUZ WR12NA 0 10 20 30 40 50 60 70 0 3 0 5 0 7 0 9 1 1 Indoor intake air DB temperature F 406 CFM Airflow Outdoor intake air WB temperature F Total power consumption kW 75 70 65 75 70 65 0 10 20 30 40 50 60 70 0 4 0 5 0 6 0 7 0 8 0 9 1 0 1 1 1 2 Indoor intake air...

Page 18: ...86 80 75 70 Suction pressure Outdoor ambient temperature Indoor DB temperature F Outdoor ambient temperature Indoor DB temperature F 86 80 75 70 MUZ WR12NA 70 75 80 85 90 95 100 105 100 120 140 160 180 PSIG PSIG 70 75 80 85 90 95 100 105 280 335 390 445 500 Condensing pressure 4 86 80 75 70 Suction pressure Outdoor ambient temperature Indoor DB temperature F u Indoor DB temperature F d e ur DB Out...

Page 19: ... 180 PSIG Condensing pressure Suction pressure Outdoor ambient temperature Indoor DB temperature F PSIG Indoor DB temperature F Outdoor ambient temperature 86 80 75 70 86 80 75 70 65 70 75 80 85 90 95 100 105 250 300 350 400 450 500 550 F F 65 70 75 80 85 90 95 100 105 80 100 120 140 160 180 200 PSIG Condensing pressure Suction pressure Outdoor ambient temperature Indoor DB temperature F PSIG Indo...

Page 20: ...ng pressure Outdoor ambient temperature F F PSIG Suction pressure Outdoor ambient temperature 5 15 25 35 45 55 65 75 250 300 350 400 450 500 550 81Hz Indoor DB temperature F 5 15 25 35 45 55 65 75 50 75 100 125 150 175 200 Indoor DB tem perature F 81Hz 75 70 65 75 70 65 PSIG Condensing pressure Outdoor ambient temperature F F PSIG Suction pressure Outdoor ambient temperature 5 15 25 35 45 55 65 75...

Page 21: ... 85 5 61 5 08 4 56 4 13 Fan motor current A 0 27 0 24 0 30 0 27 0 27 0 24 0 30 0 27 Refrigerant circuit Condensing pressure PSIG 384 331 429 347 Suction pressure PSIG 152 102 135 99 Discharge temperature F 151 155 180 165 Condensing temperature F 113 101 120 104 Suction temperature F 58 41 60 41 Comp shell bottom temperature F 146 149 174 157 Ref pipe length ft 25 Refrigerant charge R410A 1 lb 12 ...

Page 22: ...10 56 9 55 Fan motor current A 0 41 0 37 0 40 0 36 1 05 0 95 1 05 0 95 Refrigerant circuit Condensing pressure PSIG 423 361 404 403 Suction pressure PSIG 144 99 127 94 Discharge temperature F 165 161 174 194 Condensing temperature F 120 108 116 116 Suction temperature F 54 35 54 44 Comp shell bottom temperature F 149 143 173 192 Ref pipe length ft 25 Refrigerant charge R410A 2 lb 10 oz 3 lb 9 oz I...

Page 23: ... in COOL mode or 58 Hz in HEAT mode 4 Indoor fan operates at High speed 5 After 30 minutes test run operation finishes and EMERGENCY OPERATION starts operation frequency of compressor var ies 6 To cancel test run operation EMERGENCY OPERATION press EMERGENCY OPERATION switch or any button on remote controller 0 30 60 90 120 150 0 5 1 0 1 5 2 0 0 30 60 90 120 150 0 5 1 0 1 5 2 0 0 30 60 90 120 150 ...

Page 24: ...UATOR Sensor Purpose Actuator Compressor LEV Outdoor fan motor R V coil Indoor fan motor Defrost heater Discharge temperature thermistor Protection Indoor coil temperature thermistor Cooling Coil frost prevention Heating High pressure protec tion Defrost thermistor Heating Defrosting Fin temperature thermistor Protection Ambient temperature thermistor Cooling Low ambient tempera ture operation Hea...

Page 25: ...ressor at low outside tempera ture The pre heat control prevents this interference The pre heat control turns ON when the discharge temperature ther mistor is 68 F 20 C or below When the pre heat control turns ON the compressor is energized About 50 W Pre heat control setting JK ON To activate the pre heat control cut JK wire of the inverter P C board OFF To deactivate the pre heat control solder ...

Page 26: ...smoothing 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 connector housing DO NOT pull the lead wires 3 Troubleshooting procedure 1 Check if the OPERATION INDICATOR lamp on the indoor unit is blinking on and off to indicate an abnormality To make sure ch...

Page 27: ...inking does the upper lamp of the OPERATION INDICATOR lamp stay ON for 3 seconds When it stays ON for 3 seconds without beep The outdoor unit is abnormal The indoor unit is abnormal Check the blinking pattern and identify the abnormal point by referring to the table of indoor unit failure mode recall function Refer to indoor unit service manual Make sure to check at least 2 consecutive blinking cy...

Page 28: ...ng pattern and identify the abnormal point by referring to the table of outdoor unit failure mode recall function 10 2 3 Make sure to check at least 2 consecutive blinking cycles 2 Releasing the failure mode recall function Release the failure mode recall function by the following procedures Turn OFF the power supply and turn it ON again Press RESET button of the remote controller Repair the failu...

Page 29: ...ime blink 2 5 seconds OFF Discharge temperature Temperature of discharge temperature thermistor exceeds 241 F 116 C compressor stops Compressor can restart if discharge temperature thermistor reads 212 F 100 C or less 3 minutes later Check the refrigerant circuit and the refrigerant amount Refer to 10 5 Check of LEV 6 time blink 2 5 seconds OFF High pressure Temperature of indoor coil thermistor e...

Page 30: ...ligent power module IPM power module IPM 1 The compressor winding shorts circuit Reconnect compressor connector Refer to 10 5 How to check inverter compressor 14 time blink 2 5 seconds OFF Stop valve Closed valve 14 time blink 2 5 seconds OFF Closed valve is detected by compressor current Check the stop valve 4 way valve Pipe temperature 16 time blink 2 5 seconds OFF The 4 way valve does not work ...

Page 31: ...top valve Compressor synchronous abnormality Compressor start up failure protection 12 time blink 2 5 seconds OFF Waveform of compressor current is distorted Reconnect compressor connector Refer to 10 5 How to check inverter compressor 5 time blink 2 5 seconds OFF Discharge temperature Temperature of discharge temperature thermistor exceeds 241 F 116 C compressor stops Compressor can restart if di...

Page 32: ... Each phase current of compressor cannot be detected normally 14 time blink or more 2 5 seconds OFF Stop valve Closed valve 14 time blink 2 5 seconds OFF Closed valve is detected by compressor current Check stop valve 4 way valve Pipe temperature 16 time blink 2 5 seconds OFF The 4 way valve does not work properly The indoor coil thermistor detects an abnormal temperature Check the 4 way valve Rep...

Page 33: ...10 5 How to check inverter compressor Check stop valve 9 3 time blink 2 5 seconds OFF Discharge tem perature overheat protection Temperature of discharge temperature thermistor exceeds 241 F 116 C compressor stops Compressor can restart if discharge temperature thermistor reads 212 F 100 C or less 3 minutes later Check refrigerant circuit and refrig erant amount Refer to 10 5 Check of LEV 10 4 tim...

Page 34: ...rformed Refer to 10 5 Check of outdoor thermistors 20 7 time blink 2 5 seconds OFF Low discharge tem perature protection Temperature of discharge temperature thermistor has been 122 F 50 C or less for 20 minutes Refer to 10 5 Check of LEV Check refrigerant circuit and refrig erant amount 21 8 time blink 2 5 seconds OFF PAM protection PAM Pulse Ampli tude Modulation The overcurrent flows into PFC P...

Page 35: ...ard for the chart of thermistor Compressor Measure the resistance between terminals using a tester Temperature 14 104 F 10 40 C Normal Ω WR09 12 WR18 24 U V U W V W 1 26 1 72 0 82 1 11 W U V WHT RED BLK Outdoor fan motor Measure the resistance between lead wires using a tester Temperature 14 104 F 10 40 C Color of lead wire Normal Ω WR09 12 18 WR24 RED BLK BLK WHT WHT RED 29 40 12 16 W U V WHT RED...

Page 36: ...or No Yes B Check of open phase C Check of compressor With the connector between the compressor and the power module IC700 inverter and check if the inverter is normal by measuring the voltage balance between the terminals Output voltage is 50 130 V The voltage may differ according to the tester Operation method Start cooling or heating operation by pressing EMERGENCY OPERATION switch on the indoo...

Page 37: ... a drier for about 20 minutes 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 overcurrent Operation method Start heating or cooling operation by pressing EMERGENCY OPERATION switch on the indoor unit TEST RUN OPERATION Refer to 7 6 Measurement Measure the time from the start of compress...

Page 38: ... First of all measure the resistance of R V coil to check if the coil is defective Refer to 10 4 Check if there is 208 230 V AC at L1 L2 In case CN721 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 CN721 is connected Is there 208 230 V AC between CN721 and on the inverter P C board 3 m...

Page 39: ...asure the voltage of CN931 Between 1 and 5 Between 2 and 5 Between 3 and 5 Does the voltage between each terminal become 5 and 0 V DC repeatedly Does the outdoor fan motor rotate smoothly Replace the outdoor fan motor Replace the inverter P C board Yes Yes No Fixed to either 5 or 0 V DC No No Yes Check the connection between the connector CN931 and CN932 Disconnect the connectors CN931 and CN932 f...

Page 40: ...ATOR lamp on the indoor unit light up Does LED on the inverter P C board light up or blink Refer to 10 6 1 No Replace the inverter P C board Is there DC voltage 260 370 V DC between DB61 and DB61 on the inverter P C board Refer to 10 6 1 No Check the electric parts in main circuit Yes Yes No Disconnect the connector between the compressor and the power module IC700 Turn ON power supply and press E...

Page 41: ... voltage by an analog tester Properly fix the LEV coil to the expansion valve Replace the inverter P C board Replace the LEV coil Replace the expansion valve Is LEV coil properly fixed to the expansion valve Does the resistance of LEV coil have the characteristics Refer to 10 4 Do you hear the expansion valve click click Do you feel the expansion valve vibrate when touching it Turn ON the power su...

Page 42: ...oor 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 blink 10 times Replace the inverter P C board Check the corresponding parts following LED indication Refer to 10 3 Yes No Yes 10 time blink No L Check of inverter P C board OBH819A ...

Page 43: ...the LED on the inverter P C board repeat 3 6 second OFF and 0 8 sec ond ON quick blinking 3 Yes No Lighted or not lit Replace the inverter P C board 2 2 Be careful of the residual voltage of smoothing capacitor Is there amplitude of 10 to 20 V DC between the indoor terminal block S2 and S3 Confirmation of serial signal Yes Check the wiring If there are any error of the indoor outdoor connecting wi...

Page 44: ...e to confirm the wiring is correct before the opera tion starts Turn ON the power supply Does the LED on the inverter P C board repeat 3 6 second OFF and 0 8 sec ond ON quick blinking 3 Yes No Lit or not lit Replace the inverter P C board 2 2 Be careful of the residual voltage of smoothing capacitor Turn OFF the power supply Remove the bridge between outdoor terminal block S2 and S3 Yes 3 Be sure ...

Page 45: ... hazards N Check of defrost heater Check the following points before checking electric continuity 1 Does the resistance of ambient temperature thermistor have the characteristics Refer to 10 6 1 2 Is the resistance of defrost heater normal Refer to 10 4 3 Does the heater protector remain conducted not open 4 Are both ambient temperature thermistor and circuit of defrost heater securely connected t...

Page 46: ...ondition 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 of the a...

Page 47: ... CN931 Outdoor heat exchanger temperature thermistor RT68 CN644 Jumper wire for pre heat control setting JK Fuse F801 T3 15AL250V Back side of unit Expansion valve coil LEV CN724 Output to drive outdoor fan motor CN932 LED 4 14 32 50 68 86 104 0 10 20 30 40 50 60 70 80 90 100 Temperature F Defrost thermistor RT61 Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT6...

Page 48: ...ature thermistor RT68 CN644 Jumper wire for pre heat control setting JK Fuse F801 T3 15AL250V Back side of unit Expansion valve coil LEV CN724 Output to drive outdoor fan motor CN932 LED 4 14 32 50 68 86 104 0 10 20 30 40 50 60 70 80 90 100 Temperature F Defrost thermistor RT61 Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT68 32 50 68 86 104 122 140 158 176 0 ...

Page 49: ...ature thermistor RT68 CN644 Jumper wire for pre heat control setting JK Heater connector CN722 Optional parts Fuse F801 T3 15AL250V Back side of unit Expansion valve coil LEV CN724 Output to drive outdoor fan motor CN932 LED 4 14 32 50 68 86 104 0 10 20 30 40 50 60 70 80 90 100 Temperature F Defrost thermistor RT61 Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor R...

Page 50: ...Indicates the invisible parts in the photos figures 50 DISASSEMBLY INSTRUCTIONS 11 1 Slide the sleeve and check if there is a locking lever or not 2 The terminal with this connector shown below has the locking mechanism Slide the sleeve Pull the terminal while pushing the locking lever Hold the sleeve and pull out the terminal slowly Connector Sleeve Locking lever Detaching method of the terminal ...

Page 51: ...e back panel 6 Remove the inverter assembly 7 Remove the screw of the ground wire and screw of the ter minal block support 8 Remove the heat sink support from the P C board support 9 Remove the screw of the inverter P C board and remove the inverter P C board from the P C board support Photo 6 3 Removing R V coil 1 Remove the cabinet and panels Refer to section 1 2 Disconnect the following connect...

Page 52: ...rmistor and discharge temperature ther mistor CN643 Ambient temperature thermistor 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 Photo 8 Phot...

Page 53: ... the inverter assembly Refer to section 2 3 Remove all the screws fixing the reactor 4 Remove the reactor 5 Remove the soundproof felt 6 Recover gas from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 PSIG 7 Detach the brazed part of the suction and the discharge pipe connected with compressor 8 Remove the nuts fixing the compressor 9 Remove the compressor...

Page 54: ...nduit plate 9 Remove the top panel 10 Remove the valve cover 11 Disconnect the power supply and indoor outdoor connect ing wire 12 Remove all the screws of the cabinet 13 Remove the cabinet 14 Remove all the screws of the back panel 15 Remove the back panel Photo 3 Photo 4 Photo 1 Photo 2 54 Screws of the cabinet Screws of the top panel Screws of the top panel Screw of the back panel Screws of the...

Page 55: ...ve the inverter assembly 7 Remove the screw of the ground wire screw of the P C board cover and screws of the terminal block support 8 Remove the heat sink support from the P C board support 9 Remove the screw of the inverter P C board and the inverter P C board from the P C board support Photo 5 Photo 6 3 Removing R V coil 1 Remove the cabinet and panels Refer to section 1 2 Disconnect the follow...

Page 56: ...to section 1 2 Disconnect the following connectors Inverter P C board CN931 and CN932 Fan motor 3 Remove the propeller fan nut 4 Remove the propeller fan 5 Remove all the screws fixing the fan motor 6 Remove the fan motor NOTE The propeller fan nut is a reverse thread 6 Removing the compressor and 4 way valve 1 Remove the top panel cabinet and service panel Refer to section 1 2 Remove the back pan...

Page 57: ...57 OBH819A ...

Page 58: ...CTRIC CORPORATION Issued Jan 2019 No OBH819 REVISED EDITION A Published Sep 2018 No OBH819 Made in Japan HEAD OFFICE TOKYO BUILDING 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Specifications are subject to change without notice ...

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Mitsubishi Electric MSZ-WR NA Series, Service Manual

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