Mitsubishi Electric MS-CP13VA-GU1 Service Manual Download Page 38

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9-7. TEST POINT DIAGRAM AND VOLTAGE

1. Indoor power P.C. board

MS-CP13VA

Room temperature thermistor (RT11)

Indoor coil thermistor (RT12)

Temperature (°C)

Resistance (kΩ)

Fuse (F11)

T3.15AL250V

Varistor (NR11)

Connector to indoor electronic

control P.C. board (CN20A)

5 V DC

12 V DC GND

Connector to

Indoor fan motor

(CN211)

Resistor (R111)

Connector to

Terminal block

(CN201)

(+)3-6 V DC

15 V DC

(-) GND

(High voltage DC)

311-325-339 V DC

(+)0 or 15 V DC

Timer short

mode point

(Refer to

7-1.)

Room temperature thermistor RT11 (CN111)

Connector

to Indoor

coil thermis-

tor RT12

(CN112)

Vane motor

(CN151)

Connector to indoor power

P.C. board (CN10A)

12 V DC

5 V DC

To disable "Auto restart function",

cut the Jumper wire to JR77.

(Refer to 7-3.)

Emergency operation

switch (E.O. SW) (SW1)

GND

2. Indoor electronic control P.C. board

OBH782A

Summary of Contents for MS-CP13VA-GU1

Page 1: ...PART NAMES AND FUNCTIONS 3 3 SPECIFICATION 6 4 OUTLINES AND DIMENSIONS 7 5 WIRING DIAGRAM 9 6 REFRIGERANT SYSTEM DIAGRAM 10 7 SERVICE FUNCTIONS 12 8 MICROPROCESSOR CONTROL 14 9 TROUBLESHOOTING 20 10 DISASSEMBLY INSTRUCTIONS 41 Outdoor unit service manual MU CP VA Series OBH783 INDOOR UNIT OBH782 is void Revision A MS CP30VA GU1 has been added No OBH782 REVISED EDITION A TM ...

Page 2: ...on After stopping the operation of the air conditioner turn off the power supply breaker and pull the power plug Discharge the capacitor before the work involving the electric parts Precautions during the repair service Do not perform the work involving the electric parts with wet hands Do not pour water into the electric parts Do not touch the refrigerant Do not touch the hot or cold areas in the...

Page 3: ...te controller Display section Operation indicator lamp Remote control receiving section Emergency operation switch Model MS CP13VA 1 Installation plate 1 2 Installation plate fixing screw 4 25 mm 5 3 Wireless remote controller 1 4 Felt tape For left or left rear piping 1 5 Remote controller holder 1 6 Fixing screw for remote controller holder 3 5 16 mm Black 2 7 Battery AAA for wireless remote con...

Page 4: ...ntroller holder 1 6 Fixing screw for remote controller holder 3 5 16 mm Black 2 7 Battery AAA for wireless remote controller 2 Horizontal vane Air outlet Air ﬁlter Nano platinum ﬁlter Air inlet Heat exchanger Front panel Air cleaning ﬁlter Electrostatic anti al lergy enzyme ﬁlter option Remote controller Display section Operation indicator lamp Remote control receiving section Emergency operation ...

Page 5: ... panel Air cleaning ﬁlter Electrostatics anti allergy enzyme filter option Fan guard Model MS CP30VA 1 Installation plate 1 2 Installation plate fixing screw 4 25 mm 7 3 Remote controller holder 1 4 Screw for 3 3 5 16 mm Black 3 5 16 mm Black 2 5 Battery AAA for wireless remote controller 2 6 Wireless remote controller holder 1 7 Felt tape Used for left or left rear piping 2 8 Charge nut 1 9 L Joi...

Page 6: ... direction 5 Airflow Super High m 3 h 828 1 320 1 380 1 549 High 660 1 110 1 122 1 392 Med 522 930 954 1 146 Low 396 786 822 924 Sound level Super High dB A 47 53 53 53 High 42 46 47 47 Med 36 41 42 42 Low 29 35 37 37 Fan speed Super High rpm 1 270 1 290 1 340 1 200 High 1 070 1 120 1 130 1 100 Med 900 970 990 940 Low 740 840 870 790 Fan speed regulator 4 Remote controller model KM15D KM16A NOTE T...

Page 7: ...Φ6 35 Gas line Φ9 52 0 34m Flared connection Φ12 7 Drain hose InslationΦ29 Connected part Φ16 O D active length 370 1090 5 1100 45 238 5 258 5 3 280 225 225 129 239 5 281 44 49 5 500 5 439 5 199 5 199 5 110 5 65 63 76 843 181 65 65 30 63 65 67 63 325 3 100 125 160 110 70 238 5 210 21 5 184 12 Piping Insulation Ø50 O D Liquid line Ø9 52 0 5m Flared connection Ø6 35 Gas line Ø12 0 43m Flared connect...

Page 8: ...t Drain hose Piping Installation plate Air out Air in Wall hole 75 15 88 0 4m Joint connection 15 88 0 4m Flared connection 19 05 9 52 0 5m Flared connection 9 52 31 O D 15 I D 50 O D 32 I D 855 74 241 150 5 65 1155 1170 365 67 7 47 55 531 449 136 2 5 47 296 22 119 5 66 75 120 or more 220 or more 107 3 or more 10 or more 236 5 or more 55 or more 368 or more 72 or more 5 295 Liquid line Gas line OB...

Page 9: ...9 WIRING DIAGRAM 5 MS CP18VA MS CP24VA MS CP13VA MS CP30VA OBH782A ...

Page 10: ... 88 with heat insulator Refrigerant pipe ø6 35 with heat insulator Indoor coil thermistor RT12 Refrigerant flow in cooling MS CP13VA Indoor heat exchanger Flared connection Room temperature thermistor RT11 Flared connection Refrigerant pipe ø6 35 with heat insulator Indoor coil thermistor RT12 Refrigerant flow in cooling Refrigerant pipe ø12 7 with heat insulator OBH782A ...

Page 11: ...thermistor RT11 Indoor coil thermistor RT13 SUB Flared connection Refrigerant pipe ø19 05 with heat insulator Refrigerant pipe ø9 52 with heat insulator Indoor coil thermistor RT12 MAIN Strainer 50 Joint connection Flared connection Refrigerant flow in cooling OBH782A ...

Page 12: ...ack the batteries then press the RESET button Table 1 1 unit operation 2 units operation 3 units operation 4 units operation No 1 unit No modification Same as at left Same as at left Same as at left No 2 unit Solder J1 Same as at left Same as at left No 3 unit Solder J2 Same as at left No 4 unit Solder both J1 and J2 How to set the remote controller exclusively for particular indoor unit After you...

Page 13: ...er If main power is turned OFF or a power failure occurs while AUTO START STOP timer is active the timer setting is can celled If the unit has been OFF with the remote controller before power failure the auto restart function does not work as the power button of the remote controller is OFF To prevent breaker OFF due to the rush of starting current systematize other home appliance not to turn ON a...

Page 14: ...on LONG button RESET button FAN speed control button Operation select button ECONO COOL button WIDE VANE button On timer button CLOCK button POWERFUL COOL button Distance of signal About 6 m Beep s is are heard from the indoor unit when the signal is received Signal transmitting section Operation display section Temperature buttons Indication of remote controller model is on back OFF ON stop opera...

Page 15: ...ode COOL mode of I FEEL CONTROL DRY mode of I FEEL CONTROL Initial room temperature 25 or more more than 13 less than 25 8 4 I FEEL CONTROL OPERATION 1 Press OFF ON stop operate button on the remote controller OPERATION INDICATOR lamp of the indoor unit turns ON with a beep tone 2 Select I FEEL CONTROL mode with the Operation select button 3 The operation mode is determined by the room temperature...

Page 16: ...th the previous set temperature regard less of the room temperature at restart The set temperature is calculated by the previous set temperature 5 Temperature buttons In I FEEL CONTROL mode set temperature is decided by the microprocessor based on the room temperature In addition set temperature can be controlled by TOO WARM or TOO COOL buttons when you feel too cool or too warm Each time TOO WARM...

Page 17: ...L VANE control LONG MS CP18 24 30VA or POWERFUL button 9 POWERFUL COOL operation The air conditioner automatically adjusts the fan speed and the set temperature and operates the POWERFUL COOL mode The POWERFUL COOL mode is cancelled automatically 15 minutes after operation starts To cancel this operation manually select a different mode or press one of the following buttons POWERFUL COOL OFF ON st...

Page 18: ...y 10 minutes 2 To release the timer To release ON timer press On timer button To release OFF timer press Off timer button TIMER is cancelled and the display of set time disappears 2 Vertical vane MS CP18 24 30VA 1 Vane motor drive These models are equipped with a stepping motor for the vertical vane The rotating direction speed and angle of the motor are controlled by pulse signals approximately 1...

Page 19: ... operation is the test run operation This operation is for servicing The indoor fan runs at High speed and the temperature control does not work After 30 minutes of test run operation the system shifts to EMERGENCY COOL MODE with a set temperature of 24 C The fan speed shifts to Med The coil frost prevention works even in the test run or the emergency operation In the test run or emergency operati...

Page 20: ...ng ser vice work 2 Before servicing verify that all connectors and terminals are connected properly 3 When the electronic control P C board seems to be defective check for disconnection of the copper foil pattern and burnt or discolored components 4 When troubleshooting Refer to 9 2 9 3 and 9 4 4 How to replace batteries Weak batteries may cause the remote controller malfunction In this case repla...

Page 21: ... cause of abnormality cannot be found because the abnormality does not recur Setting up the failure mode recall function Turn ON the power supply Preparation of the remote controller While pressing both Operation select button and TOO COOL button on the remote controller at the same time press RESET button First release RESET button Hold down the other two buttons for another 3 seconds Make sure t...

Page 22: ...um of 6 minutes Refer to 9 6 How to check miswiring and serial signal error 11 time blink 2 5 second OFF Indoor fan motor The rotational frequency feedback signal is not emitted for 12 seconds after the indoor fan motor is operated Refer to 9 6 Check of indoor fan motor 12 time blink 2 5 second OFF Indoor control system It cannot properly read data in the nonvolatile memory of the indoor electroni...

Page 23: ...e outdoor fuse Check the indoor fuse F11 outdoor fuse F and the compres sor contactor 52C Indoor and outdoor unit do not operate If blinking of OPERATION INDI CATOR lamp cannot be checked it can be checked with failure mode recall function Upper lamp 14 time blink Cause Outdoor unit Troubles regarding refrigerant circuit Refer to 9 4 No 4 Remedy Check Flow chart of the detailed outdoor unit failur...

Page 24: ...oes not operate even in Test run operation 1 Check the outdoor unit 1 Test Run operation means the operation within 30 minutes after the emergency operation switch is pressed If blinking of OPERATION INDICATOR lamp cannot be checked it can be checked with failure mode recall function 2 There is possibility that diesel explosion may occur due to the air mixed in the refrigerant circuit First ensure...

Page 25: ...rol P C board Replace the indoor electronic control P C board 4 1 Refrigerant circuit 2 on 9 3 Upper lamp blinks 14 time blink 2 5 second OFF The unit has been pumped down for a long time Check the stop valve The refrigerant amount is low Check the connections and the refrigerant amount for any leak age The unit is short cycling Check for short cycle If any problem is found provide some space for ...

Page 26: ... short or open circuit during the compressor operation Refer to Check of outdoor thermistor Refer to outdoor unit service manual 7 Outdoor control system Left lamp blinks 7 time blink 2 5 second OFF It cannot properly read data in the nonvolatile memory of the deicer P C board Replace the deicer P C board Refer to outdoor unit service manual 8 1 Refrigerant circuit 2 on 9 3 Left lamp blinks 14 tim...

Page 27: ...P13 18 24 30VA Indoor fan motor MF Check 9 6 Check of indoor fan motor MS CP13VA Horizontal vane motor MV Measure the resistance between the terminals with a tester Temperature 10 30 C Color of the lead wire Normal RED BLU 223 Ω 268 Ω MS CP18 24VA Horizontal vane motor MV1 Vertical vane motor MV2 Measure the resistance between the terminals with a tester Temperature 10 30 C Color of the lead wire ...

Page 28: ...pressed the voltage measured at 2 above goes 0 V DC although the indoor P C board is normal Does the voltage between CN211 and on the power P C board rise to the range of 3 to 6 V DC within 12 seconds after Emergency operation switch is pressed Replace the indoor fan motor Yes No The indoor fan motor error has occurred and the indoor fan repeats 12 second ON and 30 second OFF 3 times and then stop...

Page 29: ...n CN211 and If more than 12 seconds passes after Emergency operation switch is pressed the voltage measured at 2 above goes 0 V DC although the indoor P C board is normal Does the voltage between CN211 and on the indoor electronic control P C board rise to the range of 3 to 6 V DC within 12 seconds after Emergency operation switch is pressed Replace the indoor fan motor Yes The indoor fan motor er...

Page 30: ...e between CN211 and 2 Measure the voltage between CN211 and If more than 12 seconds passes after the emergency operation switch is pressed the voltage measured at 2 above goes 0 VDC although the indoor P C board is normal Does the voltage between CN211 and on the indoor electronic control P C board rise to the range of 3 to 6 VDC within 12 seconds after the emergency operation switch is pressed Re...

Page 31: ...ton on the remote controller 1 Are there any fluorescent lights of inverter or rapid start type within the range of 1 m 2 Turn ON a radio to AM and press OFF ON stop operate button on the remote controller 1 Are there any fluorescent lights of inverter or rapid start type within the range of 1 m 2 1 Look at the image of the signal transmitting section of the remote controller through the monitor o...

Page 32: ...and press the RESET button Refer to 9 1 4 Check if the unit operates with remote con troller Yes Does the unit operate with remote controller Yes OK No not clear Yes No No No 5 VDC or 0 VDC No Yes 1 Look at the image of the signal transmitting section of the remote controller through the monitor of a digital camera or a camera phone It is normal if the LED of the signal transmitting section lights...

Page 33: ...use F11 3 Measure the resistance of resistor R111 on the indoor power P C board No No Replace the indoor power P C board the indoor terminal P C board and the indoor fan motor Replace the indoor electronic control P C board Measure the resistance of the vane motor coil Refer to 9 5 Short circuit Replace the vane motor and the indoor electronic control P C board 1 The fan motor connector s lead wir...

Page 34: ...Measure the resistance between CN211 and of the indoor fan motor connector Short circuit Replace the indoor fan motor Short circuit Replace the horizontal vane motor and the indoor electronic control P C board Turn OFF the power supply Check both parts side and pattern side of the indoor electronic control P C board visually Replace the varistor NR11 and fuse F11 3 Are the varistor NR11 burnt and ...

Page 35: ...r and the indoor electronic control P C board Turn OFF the power supply Check both parts side and pattern side of the indoor electronic control P C board visually Replace the varistor NR11 and fuse F11 Are the varistor NR11 burnt and the fuse F11 blown Be sure to check both the fuse and the varistor in any case No Yes No Is the fuse F11 blown only Yes No Is the resistance 1 M or more Measure the r...

Page 36: ...e power supply Check the wiring Correct them Turn OFF the power supply Remove the bridge between outdoor terminal block S2 and S3 Turn ON the power supply Is there amplitude of 10 to 20 V DC between outdoor terminal block S2 and S3 Confirmation of serial signal Is there rated voltage between indoor terminal block S1 and S2 Confirmation of power voltage Replace the indoor electronic control P C boa...

Page 37: ...he installation condition 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 outd...

Page 38: ...r fan motor CN211 Resistor R111 Connector to Terminal block CN201 3 6 V DC 15 V DC GND High voltage DC 311 325 339 V DC 0 or 15 V DC Timer short mode point Refer to 7 1 Room temperature thermistor RT11 CN111 Connector to Indoor coil thermis tor RT12 CN112 Vane motor CN151 Connector to indoor power P C board CN10A 12 V DC 5 V DC To disable Auto restart function cut the Jumper wire to JR77 Refer to ...

Page 39: ...DC GND high voltage DC 15 V DC 3 6 V DC 0 or 15 V DC Resistor R111 Timer short mode point Refer to 7 1 Varistor NR11 Terminal block To disable Auto restart function cut the Jumper wire to JR77 Refer to 7 3 Vane motor CN151 CN152 5 V DC 12 V DC Room temperature thermistor RT11 CN111 Indoor coil thermistor RT12 main CN112 Room temperature thermistor RT11 Indoor coil thermistor RT12 Temperature C Res...

Page 40: ...l P C board Switch P C board Power monitor receiver P C board Connector to Indoor fan motor CN211 3 6 V DC 15 V DC GND High voltage DC 325 V DC 0 or 15 V DC To disable Auto restart function cut the Jumper wire to JR77 Refer to 7 3 Fuse F11 T3 15AL250V Timer short mode point Refer to 7 1 Resistor R111 12 V DC GND 5 V DC Varistor NR11 Room temperature thermistor RT11 CN111 Indoor coil ther mistor RT...

Page 41: ... 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 with locking mechanism The terminal which has the locking mechanism can be detached as shown below There are fo...

Page 42: ...e electrical box 7 Remove the screw of the electrical cover and remove the electrical cover 8 Disconnect the following connectors Indoor power P C board CN211 Indoor fan motor CN201 Terminal block CN20A To the indoor electronic control P C board 9 Remove the upper catch of the electrical box and pull out the electrical box To attach the electrical box pass the wires connecting the indoor power P C...

Page 43: ...back side of the control P C board holder 5 Unhook the catches of the control P C board holder and open the control P C board holder 6 Remove the indoor electronic control P C board from the control P C board holder 4 Removing the vane motor 1 Remove the panel Refer to section 1 Remove the right corner box 2 Remove the control P C board holder and the electrical box Refer to section 2 3 Pull out t...

Page 44: ...9 Disconnect the lead wire of the fan motor from the motor band 10 Disengage the hooks of the motor band and remove the motor band Pull out the indoor fan motor 11 Remove the indoor coil thermistor from the heat exchanger Install the indoor coil thermistor in its former position when assembling it 12 Remove the screws fixing the left side of the heat exchanger 13 Lift the heat exchanger and pull o...

Page 45: ... Removing the panel 1 Remove the horizontal vanes 2 Remove the screw caps of the panel Remove the screws of the panel 3 Hold the lower part of both ends of the panel and pull it slightly toward you and then remove the panel by pushing it upward Photo 1 45 Screws of the panel Front panel Horizontal vanes OBH782A ...

Page 46: ...8 Remove the screw of the terminal block on the indoor terminal P C board 9 Remove the indoor terminal P C board and the indoor electronic control P C board Photo 2 Photo 3 3 Removing the indoor electrical box 1 Remove the panel Refer to section 1 and the corner box 2 Remove the indoor outdoor connecting wire Refer to section 2 3 Remove the earth wire connected to the indoor heat exchanger from th...

Page 47: ...vertical vane 3 Remove the screw of the vertical vane motor unit and pull the vertical vane motor unit 4 Remove the screws of the vertical vane motor unit cover 5 Remove the crank of the vertical vane motor unit from the shaft of the vane motor 6 Remove the vertical vane motor from the vertical vane motor unit 7 Disconnect the connector of vertical vane motor from the vertical vane motor 6 Removin...

Page 48: ... indoor fan motor 8 Remove the indoor coil thermistor from the heat exchanger Install the indoor coil thermistor in its former position when assembling it Photo 9 9 Remove the screws fixing the left side of the heat exchanger 10 Lift the heat exchanger and pull out the line flow fan to the lower left When attaching the line flow fan screw the line flow fan so 5 mm gap is provided between the right...

Page 49: ...r 3 Remove the screw of the V A clamp 4 Remove the V A clamp then remove the indoor out door connecting wire 5 Disconnect TAB of the earth wire connected to the indoor heat exchanger 6 Remove the screw of the electrical side cover Remove the electrical side cover 7 Disconnect all the connectors TAB and TAB4 on the indoor electronic control P C board 8 Remove the screw on lower side of the electric...

Page 50: ...ank of the vertical vane motor unit from the shaft of the vane motor 6 Remove the vertical vane motor from the vertical vane motor unit 7 Disconnect the connector of vertical vane motor from the vertical vane motor 5 Removing the horizontal vane motor 1 Remove the nozzle assembly Refer to section 3 2 Remove the screws of the horizontal vane motor unit and pull out the horizontal vane motor unit 3 ...

Page 51: ...or Be careful not to drop the indoor fan motor because it is heavy 9 Remove the screw of the motor band and remove the motor band then pull out the indoor fan motor 10 Remove the screws of the left side of the heat exchanger 11 Lift the left side of the heat exchanger 12 Remove the line flow fan to the lower left When attaching the line flow fan screw the line flow fan so 5 mm gap is provided betw...

Page 52: ...coil thermistor to the clip shape holder shape part the lead wire should point down 1 Set the indoor coil thermistor in the center of the clip shape part 2 Check the marked mounting position 3 Mount the clip shape part Position and procedure for mounting the clip shape part About the same length HEAD OFFICE TOKYO BUILDING 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Copyright 2018 MITSUBISHI E...

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