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Mitsubishi Electric Mr.Slim MUH24WN, Service Manual, Page: 41 / 53

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Mitsubishi Electric Mr.Slim MUH24WN Service Manual Download Page 41

41

TEST POINT DIAGRAM AND VOLTAGE
MSH24WN     Indoor electronic control P.C. board

Fan motor power supply

Fuse (F11) 
250V AC 3.15A

}

Power supply input

115V AC

+

}

5V DC

Indoor coil 
thermistor(RT12(main))

Timer short mode point
(JPS, JPG)
(Refer to page 29.)

Emergency operation 
switch

+

}

12V DC

Indoor coil thermistor(RT12(main), RT13(sub))

Room temperature thermistor (RT11)

32

F

50 68 86 104 122 140

Room temperature
thermistor(RT11)

Auto restart function
Solder the Jumper wire or the
Resistor 220

Ω

to the JR07. 

(Refer to page 30.)

Indoor coil 
thermistor(RT13(sub))

R132

Receiver P.C. board

Varistor(NR11)

OB310--2.qxp  04.1.13 9:50 AM  Page 41

Summary of Contents for Mr.Slim MUH24WN

Page 1: ...TROUBLESHOOTING 31 11 DISASSEMBLY INSTRUCTIONS 44 12 PARTS LIST 48 13 OPTIONAL PARTS BACK COVER Wireless type Models MSH24WN W MUH24WN SPLIT TYPE HEAT PUMP AIR CONDITIONERS The Slim Line From Mitsubishi Electric LIST ED C US INDOOR UNIT Indication of model name MSH24WN OUTDOOR UNIT Indication of model name MUH24WN Remote controller TM Revision PARTS LIST have been partially modified Please void OB...

Page 2: ...f outdoor unit parts WHITE NEW WHITE Brighter Capillary tubes have been added to parts list CAPILLARY TUBE TAPER PIPE 0 17X 0 12X11 13 16 CAPILLARY TUBE TAPER PIPE 0 17X 0 12X1 31 32 E02 785 936 E02 529 936 Part number Part name Model MUH24WN MUH24WN Page 51 51 ...

Page 3: ...et this way is then memorized for immedi ate recall whenever the air conditioner is used again Select desired air flow direction REMOTE CONTROL OPERATION MODE Using the remote controller you can select from five airflow set tings to match room layout and the location of people Also you can set the vane to swing automatically AUTO RESTART FUNCTION The auto restart function restarts the equipment wh...

Page 4: ... tape Used for left or left rear piping 1 7 1 2 2 1 1 1 2 3 4 5 6 7 MSH24WN ACCESSORIES Grille Air inlet Remote control receiving section Horizontal vane Remote controller Deodorizing filter option Gray sponge type Air cleaning filter option White bellows type Air filter Vertical vane Operation section When the grille is opened Display section Operation indicator lamp Receiving section Emergency o...

Page 5: ...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 VANE button Horizontal vane button CLOCK SET button LONG button WIDE VANE button Vertical vane button ...

Page 6: ...ethod Between the indoor outdoor units Refrigerant charge R22 Refrigerating oil Model Btu h Btu h Btu h W W A A F L A A kW CFM CFM pt h dB A in in in in Ib A A F L A R L A L R A dB A in in in Ib in in ft ft lb oz MSH24WN 22 000 23 600 13 500 2 220 2 230 1 730 9 9 10 0 6 8 5 9 3 10 MSH24WN White 115V 60Hz 1 15 1 1 0 82 431 491 565 402 346 484 417 565 487 7 3 39 43 47 5 8 43 5 16 8 15 16 12 13 16 40...

Page 7: ...or outdoor position is high MAX HEIGHT DIFFERENCE Outside diameter Minimum Wall thickness Outside diameter Minimum Wall thickness MSH24WN MUH24WN Additional piping Max length ft A 50 Gas Piping size in Length of connecting pipe in Liquid Indoor unit Outdoor unit Model Gas Liquid 0 0 Gas Liquid 16 15 16 19 11 16 5 8 3 8 0 0315 0 0285 MAX REFRIGERANT PIPING LENGTH ...

Page 8: ...3 Btu h TPC Total Power Consumption kW 2 Above data is for heating operation without any frost 4 1 PERFORMANCE DATA 1 COOLING CAPACITY MSH24WN MUH24WN Model Indoor air Outdoor intake air DB temperature F 71 67 63 TC 27 0 25 5 24 0 SHC 13 4 16 1 18 3 TPC 1 98 1 86 1 78 TC 25 2 23 8 22 2 SHC 12 5 15 0 17 0 TPC 2 16 2 05 1 96 TC 23 7 22 0 20 7 SHC 11 7 13 9 15 8 TPC 2 33 2 22 2 12 TC 22 0 20 5 18 8 S...

Page 9: ... Total power consumption kW Total capacity 10 Btu h Outdoor intake air DB temperature F Indoor intake air WB temperature F Indoor intake air WB temperature F Cooling SHF at rating condition 0 63 487CFM 0 19 Airflow Bypass Factor Total power consumption kW Total capacity 10 Btu h Outdoor intake air WB temperature F Indoor intake air DB temperature F Indoor intake air DB temperature F Heating 565CFM...

Page 10: ...sure Outdoor ambient temperature 68 70 75 80 85 90 95 100 104 F 140 160 180 200 220 240 260 280 300 PSIG Condensing pressure Outdoor ambient temperature Indoor DB temperature F 86 80 75 70 Indoor DB temperature F PSIG 86 80 75 70 5 10 15 20 25 30 35 40 45 50 55 60 65 70 F 140 160 180 200 220 240 260 280 300 320 340 Indoor DB temperature F 75 70 65 75 70 65 PSIG Condensing pressure Outdoor ambient ...

Page 11: ...5 8 56 250 56 185 115 35 167 70 60 109 1 280 565 Dry 47 43 DB WB DB WB DB WB Item Model Total Electrical circuit Refrigerant circuit Indoor unit Outdoor unit Cooling 22 000 0 63 2 22 2 149 9 60 8 52 257 73 180 116 52 163 80 67 53 51 1 280 487 Wet 95 MSH24WN 115V 60Hz 1 0 071 0 62 MUH24WN 208 230V 60Hz 1 0 67 0 71 25 4 lb 0 oz 750 820 1 589 1 765 MSH24WN POWER SUPPLY Control voltage Power supply vo...

Page 12: ...AGE RANGE Model MSH24WN Mode HEAT COOL 565 565 487 Air flow CFM Air speed ft sec Coverage range ft Function Dry Dry Wet 20 1 20 1 17 2 34 2 34 2 29 4 4 7 ADDITIONAL REFRIGERANT CHARGE R22 oz MSH24WN MUH24WN Outdoor unit precharged up to 25ft 4 lb 0 oz 25ft 0 30ft 1 61 35ft 3 22 Refrigerant piping length one way 40ft 4 83 45ft 6 44 50ft 8 05 Model CALCULATION Xoz 1 61 5oz ft x Additional Piping Len...

Page 13: ...6 6 13 16 16 5 16 16 5 16 3 16 8 7 8 8 15 16 9 15 16 31 1 8 2 3 16 42 1 16 43 5 16 12 13 16 Air out Air in Insulation 1 1 8 Drain hose 5 8 Connected part O D Liquid line 3 8 19 11 16 Gas line 3 4 16 15 16 Insulation 1 15 16 O D 1 1 4 I D Installation plate Wall hole 2 15 16 Wireless remote controller Installation plate Indoor unit ...

Page 14: ...9 16 1 9 16 1 1 16 Terminal block for indoor and outdoor unit connection Terminal block for power line Handle for moving 7 1 18 20 5 8 17 3 8 17 17 32 17 23 32 18 7 18 21 3 4 33 1 2 1 9 16 2 3 8 20 5 8 Service panel Refrigerant pipe flared connection 5 8 Refrigerant pipe flared connection 3 8 Knock out hole for front piping refrigerant drainage and wiring 1 5 8 1 3 4 4 1 8 1 5 16 Bottom piping hol...

Page 15: ...DSAR MC NOTE 1 About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing 2 Use copper conductors only For field wiring 3 Symbols below indicate Terminal block Connector SYMBOL RT12 RT13 SR141 TB SYMBOL MV1 MV2 NR11 RT11 SYMBOL C11 F11 HIC1 MF NAME NAME NAME INDOOR FAN CAPACITOR FUSE 3 15A DC DC CONVERTER INDOOR FAN MOTOR INNER PROTECTOR VANE MOTOR HORIZ...

Page 16: ...h service port Capillary tube O D 0 17 I D 0 12 1 31 32 Refrigerant flow in cooling Compressor Muffler 4 way valve Refrigerant flow in heating Refrigerant pipe 5 8 with heat insulator Refrigerant pipe 3 8 with heat insulator Indoor coil thermistor RT12 main LEV R V coil heating ON cooling OFF Strainer 100 Check valve Accumulator SERVICE PORT SERVICE PORT FUSIBLE PLUG Ambient temperature thermistor...

Page 17: ...FF button TEMPERATURE buttons Once the operation mode is set the same operation mode can be repeated by simply turning the OPERATE STOP ON OFF button ON Indoor unit receives the signal with a beep tone When the system turns off 3 minute time delay will oper ate to protect system from overload and compressor will not restart for 3 minutes 8 1 I FEEL CONTROL OPERATION 1 Press OPERATE STOP ON OFF but...

Page 18: ...et temperature 2 4 degrees F TOO COOL TOO WARM 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 3 degrees or more High Room temperature minus set temperature Between 2 and 3 degrees Med Room temperature minus set temperature less than 2 degr...

Page 19: ...time control Set temperature is controlled to fall 4 F from initial room temperature Indoor fan and outdoor fan operate in the same cycle as the compressor When the room temperature is 73 F or over When the thermostat is ON the compressor repeats 8 minutes ON and 3 minutes OFF When the thermostat is OFF the compressor repeats 4 minutes OFF and 1 minute ON When the room temperature is under 73 F Wh...

Page 20: ...re to blow out warm air After releasing of cold air prevention when the indoor coil thermistor RT12 temperature is 99 F or above the fan speed shifts to the set speed and when the fan speed is changed by the remote controller the fan speed is the set speed When the indoor coil thermistor RT12 temperature is less than 99 F the fan speed is controlled by time as below Difference between room tempera...

Page 21: ...osting of outdoor heat exchanger is controlled by 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 27 F or less c A...

Page 22: ...mpera ture 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 tem perature is 55 F or below 8 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 TE...

Page 23: ...otational frequency changes smoothly 2 Fan motor lock 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 u...

Page 24: ...horizontal vane returns to the closed position a When the OPERATE STOP ON OFF button is pressed POWER OFF b When the operation is stopped by the emergency operation c When the ON TIMER is on standby 6 Dew prevention During COOL or DRY operation at Vane Angle 4 or 5 when the cumulative operation time of compressor exceeds 1 hour the vane angle automatically changes to Angle 1 for dew prevention 7 S...

Page 25: ...F button to start the air conditioner 2 Check that the current time is set correctly NOTE Timer operation will not work without setting the current time Initially AM0 00 blinks at the current time display of TIME MONITOR so set the current time correctly with CLOCK SET button 3 Press TIMER CONTROL button to select the operation ON TIMER button AUTO START operation ON timer OFF TIMER button AUTO ST...

Page 26: ...ration the system shifts to EMERGENCY COOL HEAT MODE with a set temperature of 75 F 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 vane operates in VANE AUTO mode Emergency operation continues until the EMERGENCY OPERATION switch is pressed once or twice or the unit receives any ...

Page 27: ...than target one LEV is corrected in closed direction when the discharge temperature is higher than target one LEV is corrected in opening direction At thermostat OFF Opening in stop 150 pulse LEV is set to the initial opening after about 3 minutes passed At thermostat ON Same as the starting of compressor operation At remote controller OFF Opening in stop 150 pulse LEV is set so that the opening i...

Page 28: ...atus as follows Tb F HEAT COOL Normal COOL RT is less than 4deg or RT is 4deg or more and less than 6deg COOL RT is 6deg or more NOTE Target discharge temperature Tb 180 176 144 136 Operation mode NOTE Opening increases and decreases to be in the target discharge temperature during operation Opening completely Positioning Power ON Initial opening Standard opening Remote controller ON Operation The...

Page 29: ...he electronic control P C board The time will be shortened as follows Refer to page 41 Set time 1 minute 1 second Set time 3 minute 3 second It takes 3 minutes for the compressor to start operation However the starting time is shortened by short circuit of JPG and JPS The P C board has the print J1 and J2 Solder J1 and J2 according to the number of indoor unit as shown in Table 1 After modificatio...

Page 30: ...s the units to start one by one time delay How to set the remote controller exclusively for particular indoor unit After you turn the breaker ON the first remote controller that sends the signal to the indoor unit will be regarded as the remote controller for the indoor unit The indoor unit will only accepts the signal from the remote controller that has been assigned to the indoor unit once they ...

Page 31: ...int pen or the like and then use the remote controller Lead wiring Housing point 10 1 Cautions on troubleshooting 1 Before troubleshooting check the following 1 Check the power supply voltage 2 Check the indoor outdoor connecting wire for mis wiring 2 Take care the following during servicing 1 Before servicing the air conditioner first be sure to turn off the remote controller to stop the unit and...

Page 32: ...ndoor 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 7 time flash Cause Outdoor unit Trouble of outdoor control system Check room temperature thermistor and indoor coil thermis tor Refer to Test point diagram and voltage on page 41 Refer to A Check of indoor fan motor on page 35 Refer to I Check of ou...

Page 33: ...iring on page 39 3 Indoor fan motor 7 Low discharge temperature protection When discharge temperature has been 122 F or less on cool operation or has been 120 F or less on heat operation for 20 minutes Abnormal point Outdoor unit does not operate Room tempera ture thermistor 2 time flash 2 5 second OFF Detect Indoor coil room temperature thermistor short or open circuit every 8 seconds during oper...

Page 34: ...ormal 120 k 800k Abnormal Open or short circuit Normal 5 k 60 k Abnormal Open or short circuit Motor part Sensor part Measure the resistance between the terminals with a tester Part temperature 50 F 86 F Measure the voltage power ON Color of lead wire BRN YLW YLW GRY Abnormal Remain 0V or 5V Normal 4 5 5 5V When fan revolved one time 0V 5V 0V Approx Measure the resistance between the terminals wit...

Page 35: ...voltage between receiver P C board connector CN301 No 1 and No 3 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 Reinstall 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 ...

Page 36: ...t 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 ON the power supply No No Does the unit operate with the remote controller Does the OPERATION INDICATOR lamp light up by pressing the EMERGENCY OPERATION switch Yes No Be sure to check both resistance Turn OFF the power su...

Page 37: ...oard No Yes No No No Make the connection of wiring correct Yes Yes Yes Is there 208 230V AC between CN711 2 3 on the deicer P C board w1 Operate the unit in COOL or HEAT mode by pressing the EMERGENCY OPERATION switch No Make the connection of wiring correct Check the outdoor fan motor Refer to page 34 Yes Is there 208 230V AC between CN730 1 3 on the deicer P C board w1 Replace the deicer P C boa...

Page 38: ...nd L2 on the outdoor terminal block After 3 minutes is there 208 230V AC between CN721 1 3 on the 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 HEAT mode by pressing the EMERGENCY OPERATION switch After 3 minutes is there 208 230V AC between CN721 1 3 on the deicer P C b...

Page 39: ... signs Before the unit resumes normal operation Release the checking mode by pressing the RESET button on the remote controller and then send the unit signal to stop operation Turn OFF the power supply to indoor outdoor units Get indoor terminal blocks 1 1 and 3 3 opened and reconnect indoor outdoor wiring Is the power voltage to terminal blocks of indoor outdoor units normal Does the OPERATION IN...

Page 40: ...e RESET button After 3 seconds confirm all displays of the remote controller 3 Then release the OPERATION SELECT button 1 During pressing the OPERATION SELECT button and the TOO COOL button on the remote the controller press the RESET button 2 First release the RESET button After 3 seconds confirm all displays of the remote controller 3 Then release the OPERATION SELECT button AMPM CLOCK F AMPM Wh...

Page 41: ... main Timer short mode point JPS JPG Refer to page 29 Emergency operation switch 12V DC Indoor coil thermistor RT12 main RT13 sub Room temperature thermistor RT11 32 F 50 68 86 104 122 140 Room temperature thermistor RT11 Auto restart function Solder the Jumper wire or the Resistor 220Ω to the JR07 Refer to page 30 Indoor coil thermistor RT13 sub R132 Receiver P C board Varistor NR11 ...

Page 42: ... Resistance k 32 50 68 86 104 122 140 158 176 194 212 230 248 0 100 200 300 400 500 600 700 800 900 Defrost thermistor RT61 Ambient temperature thermistor RT63 4 14 32 50 68 86 104 0 10 20 30 40 50 60 70 80 90 100 Temperature F Resistance k CN662 1 2 Discharge temperature thermistor RT62 Refer to page 40 CN662 3 4 Ambient temperature thermistor RT63 Refer to page 40 LEV connector CN724 Fan motor c...

Page 43: ...in OFF 1 min ON operation AUTO or set speed AUTO or set speed AUTO or set speed links with 52C contactor AUTO or set speed OFF or Very Low speed NOTE Once the compressor is OFF 3 minute time delay circuit works at next start up COIL FROST PREVENTION MODE THERMOSTAT 52C CONTACTOR INDOOR FAN SPEED COOL COOL mode of I FEEL CONTROL DRY DRY mode of I FEEL CONTROL ON OFF for 5 min After that OFF is pro ...

Page 44: ...anel 1 Remove the screw caps of the front panel Remove the screws 2 Pull the panel down to your side slightly and unhook the catches at the top Photo 1 Photo 2 Front panel Screws Screw of the electrical cover R L holder Receiver P C board 2 Removing the electronic control P C board the receiver P C board and the display P C board NOTE In case of removing only indoor electronic control P C board wo...

Page 45: ... R L holder 5 Pull out the drain hose from the nozzle assembly remove the nozzle assembly 6 Remove the screws of the vane motor disconnect the con nector 7 Remove the vane motor 5 Removing the line flow fan and the indoor fan motor 1 Remove the front panel Refer to 1 2 Remove the electrical box Refer to 3 3 Pull out the drain hose from the nozzle assembly remove the nozzle assembly 4 Remove the wa...

Page 46: ...eller and the outdoor fan motor 1 Remove the cabinet Refer to 1 2 Remove the propeller nut and the propeller NOTE Loose the propeller in the rotating direction for removal When attaching the propeller align the mark on the propeller and the motor shaft cut section Set the propeller in position by using the cut on the shaft and the mark on the propeller 3 Remove the lead clamps and disconnect the o...

Page 47: ...ove the screws of the rear guard and the rear guard 4 Remove the screws of the separator support plate and the separator support plate Photo 4 5 Remove the screws of the motor support and the motor support Photo 4 6 Remove the relay panel Photo 3 7 Remove the fan motor lead wire from lead clamp Photo 4 8 Remove the soundproof felt 9 Remove the screws of the separator and the separator 10 Recover g...

Page 48: ...AMP PANEL Symbol in Wiring Diagram Q ty unit Including No 4 5 6 4PCS SET 3PCS SET Remarks Part No NO Part Name 1 2 3 4 5 6 7 8 9 1 1 1 4 3 1 2 1 1 W 12 2 INDOOR UNIT HEAT EXCHANGER 2 4 5 7 6 1 10 8 11 12 3 CATCH SCREW CAP E02 527 620 E02 527 666 E02 527 667 INDOOR HEAT EXCHANGER UNION GAS UNION LIQUID 5 8 3 8 10 11 12 1 1 1 12 2 INDOOR UNIT HEAT EXCHANGER 12 1 INDOOR UNIT STRUCTURAL PARTS Optional...

Page 49: ...ROOM TEMPERATURE THERMISTOR TERMINAL BLOCK INDOOR COIL THERMISTOR VANE MOTOR SUPPORT SET RIGHT VANE MOTOR SUPPORT SET LEFT Symbol in Wiring Diagram Q ty unit 3 15A RIGHT LEFT UP DOWN Remarks Part No NO Part Name F11 NR11 MF MV2 MV1 RT11 TB RT12 RT13 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 W RC4W33 Including RUBBER MOUNT AUTO RESTART Including No 16 Part numbers that are circled are not shown i...

Page 50: ...MUH24WN 12 5 OUTDOOR UNIT STRUCTURAL PARTS ELECTRICAL PARTS AND FUNCTIONAL PARTS 1 3 5 32 2 30 28 10 16 7 27 6 33 8 4 2 11 24 12 18 19 26 31 9 25 14 13 23 22 B A 9 21 20 50 17 15 29 ...

Page 51: ...SE CABINET HANDLE FAN GUARD COMPRESSOR RUBBER SET COMPRESSOR STOP VALVE LIQUID STOP VALVE GAS DEFROST THERMISTOR FUSIBLE PLUG SERVICE PORT R V COIL 4 WAY VALVE EXPANSION VALVE EXPANSION VALVE COIL SERVICE PANEL COVER PANEL TERMINAL BLOCK TERMINAL BLOCK OUTDOOR FAN CAPACITOR COMPRESSOR CONTACTOR COMPRESSOR CAPACITOR SURGE ABSORBER DEICER P C BOARD REAR PANEL REAR GUARD SIDE PANEL MOTOR SUPPORT FUSE...

Page 52: ...G 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 AIR CLEANING FILTER can be attached o...

Page 53: ...3400 Lawrenceville Suwanee Road Suwanee Georgia 30024 Toll Free 800 433 4822 Toll Free Fax 800 889 9904 www mrslim com Specifications are subject to change without notice ...

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