Mitsubishi Electric MSH-C18TV Page 38 Service Manual Download

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Measure the resistance between the terminals with a tester.
(Coil wiring temperature10°C ~ 30°C)

Compressor
(MC)

Room
temperature
thermistor(RT11)

2. Trouble criterion of main parts

Part name

Indoor coil
thermistor(RT12)

Indoor fan
motor
(MF)

Motor part

Sensor part

Outdoor fan
motor
(MF)

Vane motor
(MV)

Check method and criterion

Measure the resistance with a tester.
(Part temperature 10°C ~ 30°C)

Measure the resistance between the terminals with a tester.
(Coil wiring temperature –10°C ~ 40°C)

Measure the voltage Power ON.

Measure the resistance between the terminals with a tester.
(Coil wiring temperature –10°C ~ 40°C)

Measure the resistance between the terminals with a tester.
(Part temperature10°C ~ 30°C)

Figure

BLK

MAIN

AUX.

RED

WHT

Normal

Ω

~ 20k

Ω

Abnormal

Open or short-circuit

Normal

0.93 ~ 1.15

Ω

1.79 ~ 2.19

Ω

C-R

MSH-C18TV

0.59 ~ 0.73

Ω

1.78 ~ 2.18

Ω

MSH-C24TV

C-S

Normal

Abnormal

Open or

short-circuit

176 ~ 192

Ω

240 ~ 261

Ω

WHT-BLK

BLK-RED

BRN-YLW

YLW-GRY

Normal

4.5 ~ 5.5V

Abnormal

Remain 0V or 5V

(When fan revolved one time)

➔

(Approx.)

Normal

Abnormal

Open or

short-circuit

97 ~ 120

Ω

MSH-C18TV

102 ~ 126

Ω

WHT-BLK

BLK-RED

–

BLK-YLW

Normal

Abnormal

Open or short-circuit

RED-other one

Abnormal

Open or

short-circuit

MAIN

AUX.

BLK

MSH-C18TV

MSH-C24TV

RED

WHT

ORN

RED ORN WHT

YLW

BLK

MAIN

AUX.1 AUX.2

–

YLW-RED

–

MSH-C24TV

55 ~ 68

Ω

26 ~ 33

Ω

55 ~ 68

Ω

YLW

RED

BLU

ORN

PNK

ROTOR

:INNER PROTECTOR

MAIN

AUX.

FUSE

BLK

RED

WHT

BRN

Defrost
thermistor(RT61)

Measure the resistance with a tester.
(Part temperature –10°C ~ 40°C)

Normal

Ω

~ 60k

Ω

Abnormal

Open or short-circuit

MSH-C18TV -

MUH-C18TV -

MSH-C24TV -

MUH-C24TV -

Ambient
temperature
thermistor(RT63)

358 ~ 388

Ω

OB279-2.qxp 2/15/01 10:55 AM Page 38

Summary of Contents for MSH-C18TV

Page 1: ...6 WIRING DIAGRAM 11 7 REFRIGERANT SYSTEM DIAGRAM 13 8 PERFORMANCE CURVES 15 9 MICROPROCESSOR CONTROL 23 10 SERVICE FUNCTIONS 33 11 TROUBLESHOOTING 35 12 DISASSEMBLY INSTRUCTIONS 47 13 PARTS LIST 53 14 OPTIONAL PARTS 58 Wireless type Model MSH C18TV WH MUH C18TV MSH C24TV WH MUH C24TV E1 E1 E1 E1 No OB279 MSH C18TV MSH C24TV E1 E1 HFC utilized R407C OB279 1 qxp 2 15 01 10 44 AM Page 1 ...

Page 2: ...ONTROL button 3 Indoor electronic control P C board has changed MSH C24TV New model MUH C18SV MUH C18TV 1 Path of heat exchanger has changed 2 Temperature of defrosting control has changed 3 2 7 3 Capillary tube has changed 3 0 o 1 6 o 750 2pcs 3 0 o 1 4 o 600 2pcs 3 0 o 2 0 o 500 3 0 o 2 0 o 850 3 0 o 2 0 o 350 has removed 4 Refrigerant filling capacity has changed 1 70kg 1 60kg MUH C24TV New mod...

Page 3: ...to contaminations than HCFC R22 refrigerant 2 Clean refrigerant pipings should be used 3 Composition change may occur in R407C since it is a mixed refrigerant When charging charge liquid refrigerant to prevent composition change 4 Be especially careful when managing the tools If dust dirt or water mixes in the refrigerant cycle it may cause decrease of performance New Specification Previous Specif...

Page 4: ...oil inside the piping and joints deterioration of the refrigerant oil will result 3 Refrigerant oil Apply the specific refrigeration oil accessories to the flare and the union seat surfaces 4 Air purge Use the vacuum pump for air purge to protect environments and to avoid changing the composition of refrigerant 5 Additional charge For additional charging charge the refrigerant with liquid phase sl...

Page 5: ...ORIES Indoor unit 1 2 3 4 5 6 7 Installation plate Installation plate fixing screw 4 o 25 mm Remote controller mouting hardware Fixing screw for 3 o 3 5 o 1 6 mm Black Battery AAA for remote controller Wireless remote controller Felt tape Used for left or left rear piping 1 6 1 2 2 1 1 MSH C18TV MSH C24TV E1 E1 Outdoor unit 8 9 Drain socket Drain cap 33 Drain cap 16 1 6 1 2 1 MUH C18TV E1 MUH C24T...

Page 6: ... PM CLOCK AM RESET CLOCK Open the front lid Signal transmitting section Operation display section OPERATE STOP ON OFF button TEMPERATURE buttons OPERATION SELECT button FAN SPEED CONTROL button OFF TIMER button HR button MIN button TIME SET button ON TIMER button RESET button ECONO COOL button VANE CONTROL button CLOCK SET button OB279 1 qxp 2 15 01 10 44 AM Page 6 ...

Page 7: ...0 3 10 10 MUH C18TV E1 2 196 0 39 PE 36VPEHT 1 600 C R 1 06 C S 2 03 RA6V50 OG WHT BLK 116 4 BLK RED 111 0 850o605o290 54 52 828 1 1 60 1 100 NEO22 33 18 Cooling 5 2 2 4 9 4 2 110 2 46 8 76 Heating 6 0 9 7 2 180 2 75 9 06 MSH C24TV E1 Single phase 230V 50Hz 816 25 83 0 29 RA4V27 EE WHT BLK 183 3 BLK RED 250 5 1 015O320O190 14 5 45 1 260 3 10 10 MUH C24TV E1 2 700 0 58 NE 47VMHHT 2 200 C R 0 67 C S...

Page 8: ...LINE High NOTCH Heating Dry bulb temperature 20 Wet bulb temperature 15 5 MSH C18TV E1 MSH C24TV E1 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 Test conditions Cooling Dry bulb temperature 35 Wet bulb temperature 24 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS...

Page 9: ...ine 8 0 5m Gas line 12 0 43m Insulation 50 O D 28 I D Insulation 28 Drain hose 16 Air out Air in Wireless remote controller 162 19 58 100mm or more 100mm or more 100mm or more 350mm or more 500mm or more Drainage 3holes 33 Air out Air in Air in Service panel Liquid refrigerant pipe joint Refregerant pipe flared 6 35 Gas refregerant pipe joint Refregerant pipe flared 15 88 3 5 3 0 30 100 161 157 74...

Page 10: ...2 17 15 39 5 27 5 Terminal block for indoor and outdoor unit connection Handle for moving 179 524 441 445 450 468 553 850 40 60 524 Service panel Refrigerant pipe flared connection 15 88 Refrigerant pipe flared connection 9 52 Knock out hole for front piping refrigerant drainage and wiring 42 45 104 33 Bottom piping hole 2 U shaped notched holes Drainage hole 33 Drainage hole 33 2 12o23 Oval holes...

Page 11: ...ID IC INDOOR FAN MOTOR INNER FUSE VANE MOTOR VARISTOR ROOM TEMPERATURE THERMISTOR SYMBOL RT12 TB 52C NAME INDOOR COIL THERMISTOR TERMINAL BLOCK CONTACTOR L CIRCUIT BREAKER BRN FROM INDOOR UNIT CONNECTING 12V 3 TB RED RED RED ORN WHT BLK RT61 F61 X62 1 1 2 3 4 1 2 3 4 CN730 CN661 CN721 CN720 SR61 CN711 TAB21 TRANS TAB20 RED S C R MC MF BLK BLK BLU BLU WHT WHT WHT DEICER P C BOARD WHT NO COM 52C C1 ...

Page 12: ...RE THERMISTOR SYMBOL RT12 TB 52C NAME INDOOR COIL THERMISTOR TERMINAL BLOCK CONTACTOR PE CIRCUIT BREAKER DEICER P C BOARD NOTES 1 Use copper conductors only For field wiring 2 Since the indoor and outdoor unit connecting wires have polarity connect them according to the numbers 3 N 2 3 Symbols below indicate Terminal block Connector WHT WHT CZ RED GRN YLW COM NO T61 BLU ORN C2 6 5 4 3 RED ORN WHT ...

Page 13: ...F Refrigerant flow in cooling Refrigerant flow in heating Strainer Distributor 4 way valve MSH C24TV E1 MUH C24TV E1 INDOOR UNIT OUTDOOR UNIT Indoor heat exchanger Room temperature thermistor RT11 Refrigerant pipe 15 88 with heat insulator Flared connection Flared connection Indoor coil thermistor RT12 Refrigerant pipe 9 52 with heat insulator Stop valve Strainer Capillary tube 3 0X 2 0X450 Defros...

Page 14: ...n 5m regardless of which unit indoor or outdoor position is high Outdoor unit Model MSH C18TV E1 MUH C18TV E1 Refrigerant piping length one way Outdoor unit precharged 1600 15m 280 7m 0 10m 105 MAX HEIGHT DIFFERENCE ADDITIONAL REFRIGERANT CHARGE R407C g MAX REFRIGERANT PIPING LENGTH Calculation Xg 35g m Refrigerant piping length m 7 Model MSH C24TV E1 MUH C24TV E1 Refrigerant piping length one way...

Page 15: ... ence between the indoor intake air wet dry bulb temperature and the indoor outlet air wet dry bulb temperature for your reference at service How to measure the indoor air wet bulb 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...

Page 16: ...ystem of units SI unit system The conversion factor is 1 MPa Gauge 10 2 kgf f f Gauge 15 20 50 25 60 30 70 35 0 3 0 4 0 5 0 6 0 7 18 32 230V 7 6 5 4 3 18 32 230V 15 20 50 25 60 30 70 35 6 7 8 9 10 11 MUH C18TV E1 MUH C18TV E1 Outdoor low pressure Ambient temperature C Ambient humidity Ambient temperature C Ambient humidity Outdoor unit current A kgf F Gauge MPa Gauge kgf F Gauge MPa Gauge 15 20 50...

Page 17: ...oor Dry bulb temperature 7 15 20 C Wet bulb temperature 6 12 14 5 C MUH C18TV E1 5 10 15 20 25 9 10 11 12 13 7 21 230V Outdoor unit current A Ambient temperature C 5 10 15 20 25 12 13 14 15 16 7 21 230V Outdoor unit current A Ambient temperature C MUH C24TV E1 OB279 1 qxp 2 15 01 10 44 AM Page 17 ...

Page 18: ...0 6 71 6 97 5 85 6 11 6 40 6 71 6 97 5 85 6 11 6 40 6 71 6 97 5 85 6 11 6 40 6 71 6 97 2 93 2 32 3 16 2 57 1 92 3 39 2 81 2 17 3 63 3 06 2 43 1 74 3 86 3 30 2 69 2 01 4 10 3 54 2 94 2 28 1 53 4 33 3 79 3 20 2 55 1 81 4 56 4 03 3 45 2 82 2 09 4 80 4 28 3 71 3 09 2 37 5 03 4 52 3 97 3 35 2 65 5 27 4 77 4 22 3 62 2 93 5 50 5 01 4 48 3 89 3 21 1772 1878 1772 1878 1952 1772 1878 1952 1772 1878 1952 202...

Page 19: ... 5 93 4 68 4 99 5 30 5 62 5 93 4 68 4 99 5 30 5 62 5 93 2 34 1 90 2 53 2 10 1 59 2 71 2 30 1 80 2 90 2 50 2 02 1 49 3 09 2 70 2 23 1 68 3 28 2 90 2 44 1 91 1 30 3 46 3 10 2 65 2 13 1 54 3 65 3 29 2 86 2 36 1 78 3 84 3 49 3 08 2 58 2 02 4 02 3 69 3 29 2 81 2 25 4 21 3 89 3 50 3 03 2 49 4 40 4 09 3 71 3 26 2 73 2194 2258 2194 2258 2363 2194 2258 2363 2194 2258 2363 2427 2194 2258 2363 2427 2194 2258...

Page 20: ...5 8 13 8 44 7 09 7 40 7 75 8 13 8 44 7 09 7 40 7 75 8 13 8 44 7 09 7 40 7 75 8 13 8 44 3 47 2 74 3 76 3 04 2 25 4 04 3 33 2 56 4 32 3 63 2 87 2 03 4 61 3 92 3 18 2 36 4 89 4 22 3 49 2 68 1 77 5 17 4 52 3 80 3 01 2 11 5 46 4 81 4 11 3 33 2 45 5 74 5 11 4 42 3 66 2 79 6 02 5 40 4 73 3 98 3 12 6 31 5 70 5 04 4 31 3 46 6 59 6 00 5 35 4 63 3 80 2394 2537 2394 2537 2636 2394 2537 2636 2394 2537 2636 273...

Page 21: ... 7 18 5 67 6 05 6 43 6 80 7 18 5 67 6 05 6 43 6 80 7 18 2 78 2 24 3 01 2 48 1 86 3 23 2 72 2 12 3 46 2 96 2 38 1 70 3 69 3 21 2 63 1 97 3 91 3 45 2 89 2 25 1 51 4 14 3 69 3 15 2 52 1 80 4 37 3 93 3 41 2 79 2 08 4 59 4 17 3 66 3 06 2 37 4 82 4 42 3 92 3 33 2 66 5 05 4 66 4 18 3 61 2 94 5 27 4 90 4 43 3 88 3 23 2964 3050 2964 3050 3192 2964 3050 3192 2964 3050 3192 3278 2964 3050 3192 3278 2964 3050...

Page 22: ...NCE DATA HEAT operation NOTE Q Total capacity kW INPUT Total power input W DB Dry bulb temperature OUTDOOR WB INDOOR 10 5 0 5 10 15 20 DB Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT CAPACITY 7 5 KW INPUT 3020 W 15 21 26 4 73 4 50 4 05 1963 2114 2265 5 70 5 40 5 03 2356 2507 2658 6 68 6 38 5 93 2658 2778 2929 7 65 7 28 6 90 2869 2990 3141 8 63 8 25 7 88 3050 3141 3292 9 53 9 15 8 78 314...

Page 23: ...evious operation COOL mode of I FEEL CONTROL or COOL mode Once the mode is fixed the mode does not change by room temperature afterwards Under the ON TIMER operation mode is deter mined according to the room temperature at the set time the operation starts When the system is stopped on the remote controller and restarted within 2 hours in I FEEL CONTROL mode the system operates in previous mode au...

Page 24: ...m temperature 1 Indoor fan speed control Indoor fan operates at the set speed by FAN SPEED CONTROL button In AUTO the fan speed is as follows Initial temperature difference Fan Speed Room temperature minus set temperature 1 7 degrees or more High Room temperature minus set temperature Between 1 and 1 7 degrees Med Room temperature minus set temperature less than 1 degree Low 9 1 1 COOL mode of I F...

Page 25: ... fan speed becomes Low 2 The operation of the compressor and indoor outdoor fan Compressor operates by room temperature control and time control Set temperature is controlled to fall 2 C from initial room temperature Indoor fan and outdoor fan operate in the same cycle as the compressor When the room temperature is 23 C or over When the thermostat is ON the compressor repeats 8 minutes ON and 3 mi...

Page 26: ...rol After the thermostat turns off the indoor fan operates at Very Low NOTE When the thermostat turns on the fan operates at the set speed Due to the cold air prevention control the fan does not start at set speed until the indoor coil thermistor RT12 reads 22 C or more Difference between room temperature and set temperature during operation 1deg 1 7deg 4deg 2deg Initial temperature difference Fan...

Page 27: ... deicer P C board with detection by the defrost thermistor RT61 1 Starting conditions of defrost When all conditions of a c are satisfied the defrosting operation starts a Under the heat operation the compressor cumulative operation time exceeds 40 minutes without the defrosting opera tion working b The defrost thermistor RT61 reads 2 7 C or less MSH C18TV 2 0 C or less MSH C24TV c After releasing...

Page 28: ...et temperature is as shown on the right chart Thermostat SET TEMP does not work The other operations are same as DRY mode of I FEEL CONTROL 4 DRY operation will not function when the room temperature is 13 C or below 9 4 HEAT OPERATION 1 Press OPERATE STOP ON OFF button OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone 2 Select HEAT mode with the OPERATION SELECT button 3 Press...

Page 29: ...ock up protection When the rotational frequency feedback signal has not output for 12 seconds or when the microprocessor cannot detect the signal for 12 seconds the fan motor is regarded locked up Then the electric current to the fan motor is shut off 3 minutes later the electric current is applied to the fan motor again During the fan motor lock up the OPERATION INDICATOR Indicator lamp flashes o...

Page 30: ...set 2 C higher than that in COOL mode Also the horizontal vane swings in various cycle according to the temperature of indoor heat exchanger RT12 SWING operation makes you feel cooler than set temperature So even though the set temperature is higher than that in COOL mode the air conditioner can keep comfort As a result energy can be saved ECONO COOL operation is cancelled when the ECONO COOL butt...

Page 31: ...roller at the position where its signal can reach the air conditioner even during TIMER operation or the set time may deviate within the range of about 10 minutes NOTE2 Reset the timer in the following cases or the set time may deviate and other malfunctions may occur A power failure occurs The circuit breaker functions 2 Cancel TIMER setting can be cancelled with the ON OFF TIMER buttons To cance...

Page 32: ... servicing The indoor fan speed runs at High speed and the system is in continuous operation The thermostat is ON After 30 minutes of test run operation the system shifts to EMERGENCY COOL HEAT MODE with a set temperature of 24 C The fan speed shifts to Med speed The coil frost prevention works even in emergency operation and defrosting too In the test run or emergency operation the horizontal van...

Page 33: ...ndoor unit How to modify the remote controller P C board Remove batteries before modification The board has a print as shown below Jumper wire JPC Defrost interval time changes from 40 minutes to 15 minutes MUH C18TV Model Change point E1 MUH C24TV Jumper wire JRF Defrost interval time changes from 40 minutes to 15 minutes E1 Model Change point 10 3 TIMER SHORT MODE For service set time can be sho...

Page 34: ... desig nated as the indoor unit number Therefore at and after the second time indoor unit accepts the remote controller of the initial setting number At setting error turn the power supply off to cancel the individual operation and then turn the power supply on to restart the setting Table 1 No 1 unit No 2 unit No 3 unit No 4 unit 1 unit operation No modification 2 units operation Same as at left ...

Page 35: ...d off to indicate an abnormality To make sure check how many times the abnormality indication is flashing on and off before starting service work 2 Before servicing check that the connector and terminal are connected properly 3 If the electronic control P C board is supposed to be defective check the copper foil pattern for disconnection and the components for bursting and discolouration 4 When tr...

Page 36: ...lash Cause Indoor unit Trouble of room temp erature indoor coil thermistor 3 time flash Cause Indoor unit Trouble of indoor fan motor 6 time flash Cause Outdoor unit Trouble of thermistor in outdoor unit Refer to G How to check mis wiring and sirial singal error When outdoor unit doesn t operate on page 43 1 Check room temperature thermistor and indoor coil thermis tor Refer to Test point diagram ...

Page 37: ...ndoor fan operation When the defrost thermistor shorts or opens after the com pressor start up Check point Check wiring visual check and conductiv ity check Check indoor electronic control P C board Check deicer P C board Check electrical parts Check resistance of thermistor Re connect connector Check indoor electronic control P C board Disconnect connector CN211 and then check connector CN121 to ...

Page 38: ...kΩ Abnormal Open or short circuit Normal 0 93 1 15Ω 1 79 2 19Ω C R MSH C18TV 0 59 0 73Ω 1 78 2 18Ω MSH C24TV C S Normal Abnormal Open or short circuit 176 192Ω 240 261Ω WHT BLK BLK RED BRN YLW YLW GRY Normal 4 5 5 5V Abnormal Remain 0V or 5V When fan revolved one time 0V 5V 0V Approx Normal Abnormal Open or short circuit 97 120Ω MSH C18TV 102 126Ω WHT BLK BLK RED BLK YLW Normal Abnormal Open or sh...

Page 39: ...iver P C board connector No 2 and No 1 when the remote controller button is pressed Is the voltage approx 4V DC Replace the indoor electronic control P C board Replace the receiver P C board Replace the remote controller Re install the unit away from lights Attach a filter on receiving part Yes 0 or No others Yes No Yes No Switch on the remote controller Is LCD display on the the remote controller...

Page 40: ...or in any case Replace the fan motor Replace the indoor electronic control P C board Is winding resistance of fan motor 0 Is winding resistance of vane motor 0 No Yes Replace the vane motor No Yes Yes Is varistor NR11 burnt Replace the varistor Yes Turn OFF the power supply Remove indoor fan motor connector CN211 and vane motor connector CN151 from the indoor electronic control P C board and turn ...

Page 41: ...P C board No Make the connection of wiring correct Check the outdoor fan motor Refer to page 38 Yes Replace the deicer P C board Replace the deicer P C board No No Is there 230V AC between CN730 1 3 on the deicer P C board Is there 5V DC between J101 J401 on the deicer P C board Refer to page 46 Check of outdoor unit MSH C24TV only After 30 seconds does compressor stop No Yes Is there 230V AC betw...

Page 42: ...e deicer P C board Replace the deicer P C board Yes No Replace the R V coil Disconnect the TAB52 on the deicer P C board Turn ON the power supply and operate the indoor unit in COOL mode by pressing the EMERGENCY OPERATION switch Unit operates COOL mode even if it is set HEAT mode w First measure the resistance of R V coil to confirm it is disconnected or is not short circuit Unit operates HEAT mo...

Page 43: ...ort circuit of JPG and JPS on the indoor electronic control P C board enables self check to be displayed in 3 seconds Serial signal error is indicated 0 5 sec ON 2 5 sec OFF Repair wiring Is there mis wiring poor contact or wire disconnection Is there 20V DC between both ends of R132 when 52C contactor turns ON By tester the stylus is between 0 20V Yes Yes No No No No No Yes Mis wiring is indicate...

Page 44: ...supply input 230V AC 5V DC Indoor coil thermistor RT12 JPS JPG Emergency operation switch 12V DC P C board 0 20V DC R132 Room temperature thermistor RT11 Resistance k C144 C144 JPG JP41 Auto restart function Cut the Resistor JR06 Refer to page 34 Timer short mode point OB279 2 qxp 2 15 01 10 55 AM Page 44 ...

Page 45: ... Refer to page 43 230V AC CN661 Defrost thermistor RT61 Refer to page 43 Fuse F61 2A 250V Defrost interval time short pin JP607 R853 Refer to page 33 J9 J8 5V DC Jumper wire for change in defrost setting JPC See page 33 52C 12V DC IC881 12V DC Refer to page 43 OB279 2 qxp 2 15 01 10 55 AM Page 45 ...

Page 46: ...efrost ther mistor RT61 Refer to page 43 Defrost thermistor RT61 Ambient temperature thermistor RT63 20 10 0 10 20 30 40 0 10 20 30 40 50 60 70 80 90 100 Temperature Resistance k CN662 3 4 Ambient tempera ture thermistor RT63 Refer to page 43 Fan motor CN711 Varistor NR61 CN7301 3 230V AC Refer to page 41 and 43 R601 10V DC Refer to page 43 Refer to page 41 J101 J401 R V coil 230V AC OB279 2 qxp 2...

Page 47: ...d wires on the electronic control P C board 9 Remove the electronic control P C board and display P C board Photo 2 Photo 1 Front panel Screws NOTE Screw of the termi nal block Indoor electronic control P C board Receiver holder Receiver P C board Display P C board Lamp holder 1 Slide the sleeve and check if there is a locking lever or not 2 The terminal with this connector is a terminal with lock...

Page 48: ... electrical box 3 Unhook the catches on the both sides of the nozzle assem bly 4 Remove the nozzle assembly 5 Remove the screws of the bearing support 6 Remove the screw of the heat exchanger unhook the catch 7 Lifting the heat exchanger remove the bearing support 8 Loose the screw fixing the line flow fan remove the line flow fan 9 Remove the screws of the motor band remove the fan motor Photo 4 ...

Page 49: ... 2 Removing the deicer P C board 1 Remove the service panel and the cabinet 2 Disconnect all the connectors and the terminals on the deicer P C board 3 Remove the deicer P C board 12 2 MUH C18TV OUTDOOR UNIT E1 Photo 1 Photo 3 Photo 2 Screws Screws Service panel Terminal block TB Compressor capacitor C1 Deicer P C board OB279 2 qxp 2 15 01 10 56 AM Page 49 ...

Page 50: ... Remove the terminal cover on the compressor 4 Remove the electrical assembly Refer to 2 5 Recover gas from the refrigerant circuit 6 Disconnect the welded part of the discharge pipe 7 Disconnect the welded part of the suction pipe 8 Remove nuts fixing the compressor 9 Remove the compressor Photo 5 Terminal cover Compressor Discharge pipe Suction pipe Compressor nuts Photo 4 Propeller fan Set scre...

Page 51: ...t Open the cabinet to a 45 degree angle Then lift it and unhook the catches to remove 3 Removing the propeller fan and the outdoor fan motor 1 Remove the cabinet Refer to 1 2 Remove the propeller fan nut and the propeller fan NOTE Loose the propeller fan in the rotating direction for removal When attaching the propeller fan align the mark on the propeller fan and the motor shaft cut section Set th...

Page 52: ... side panel and the side panel 3 Remove the screws of the rear guard and the rear guard 4 Remove the screws of the separator support plate and the separator support plate 5 Remove the screws of the motor support and the motor support 6 Remove the relay panel Disconnect the fan motor lead wires 7 Remove the soundproof felt 8 Remove the screws of the separator and the separator 9 Recover gas from th...

Page 53: ... 138 000 E02 138 010 E02 143 067 E02 141 100 E02 516 007 Part number that is circled is not shown in the illustration 1 2 3 4 5 6 MSH C18TV WH MSH C24TV WH 13 1 INDOOR UNIT STRUCTURAL PARTS E1 E1 E02 141 620 E02 138 667 E02 176 667 E02 138 666 8 9 10 INDOOR HEAT EXCHANGER UNION LIQUID UNION LIQUID UNION GAS 6 35 9 52 15 88 1 1 1 1 1 1 9 10 8 13 2 INDOOR UNIT HEAT EXCHANGER 13 1 INDOOR UNIT STRUCTU...

Page 54: ...OUNT DISPLAY P C BOARD VARISTOR FUSE THERMAL FUSE THERMAL FUSE SURGE ABSORBER SURGE ABSORBER Part No Symbol in Wiring Diagram Part Name RT12 MV TB TB RT11 MF MF NR11 F11 F12 F12 DSAR DSAR Q ty unit MSH C18TV 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 WH E1 MSH C24TV WH E1 AUTO RESTART AUTO RESTART RA4V27 RA4V27 2PCS SET 3 15A 93 93 Remarks Part numbers that are...

Page 55: ...UPPORT COMPRESSOR RUBBER SET COMPRESSOR BASE STOP VALVE GAS STOP VALVE LIQUID SERVICE PANEL 4 WAY VALVE COMPRESSOR CAPACITOR OUTDOOR FAN MOTOR TERMINAL BLOCK DEICER P C BOARD DEFROST THERMISTOR COMPRESSOR CONTACTOR CAPILLARY TUBE CAPILLARY TUBE FUSE R V COIL SURGE ABSORBER CHECK VALVE 1 1 1 1 1 1 4 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 MC C1 MF TB RT61 52C F61 21S4 DSAR 4RUBBERS SET PE 36VPEHT 15 88...

Page 56: ...6 MUH C24TV 13 6 OUTDOOR UNIT STRUCTURAL PARTS ELECTRICAL PARTS AND FUNCTIONAL PARTS E1 1 3 5 27 2 25 24 9 12 6 23 28 7 4 2 13 19 14 11 10 22 21 26 8 20 16 15 18 17 8 OB279 2 qxp 2 15 01 10 56 AM Page 56 ...

Page 57: ...0 21 22 23 24 25 26 27 28 29 30 31 TOP PANEL AMBIENT TEMPERATURE THRMISTOR OUTDOOR HEAT EXCHANGER OUTDOOR FAN MOTOR PROPELLER FAN BASE CABINET HANDLE FAN GUARD 4 WAY VALVE R V COIL DEFROST THERMISTOR COMPRESSOR RUBBER SET COMPRESSOR STOP VALVE LIQUID STOP VALVE GAS SERVICE PANEL COVER PANEL TERMINAL BLOCK OUTDOOR FAN CAPACITOR SURGE ABSORBER COMPRESSOR CONTACTOR COMPRESSOR CAPACITOR DEICER P C BOA...

Page 58: ...co and odor of pets Clean DEODORIZING FILTER every two weeks If the filter is particularly dirty clean the filter more often For cleaning soak the filter in warm water for a while and then wash and rinse it Dry the filter in the shade thoroughly When the filter color is still dark even after cleaning replace the filter with a new one Replace the filter at least once a year DEODORIZING FILTER and A...

Page 59: ...OB279 2 qxp 2 15 01 10 56 AM Page 59 ...

Page 60: ...t to change without notice C C Copyright 2001 MITSUBISHI ELECTRIC ENGINEERING CO LTD Distributed in Feb 2001 No OB279 PDF 248 Made in Japan HEAD OFFICE MITSUBISHI DENKI BLDG 2 2 3 MARUNOUCHI CHIYODA KU TOKYO100 8310 JAPAN OB279 2 qxp 2 15 01 10 56 AM Page 60 ...

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