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Mitsubishi Electric MSZ-A18YV, Service Manual

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SERVICE MANUAL

CONTENTS

1. PART NAMES AND FUNCTIONS······················2
2. SPECIFICATION·················································4
3. NOISE CRITERIA CURVES ·······························5
4. OUTLINES AND DIMENSIONS ·························6
5. WIRING DIAGRAM ············································7
6. REFRIGERANT SYSTEM DIAGRAM ················8
7. SERVICE FUNCTIONS ······································9
8. TROUBLESHOOTING······································11
9. DISASSEMBLY INSTRUCTIONS ····················20

10. PARTS LIST······················································22
11. OPTIONAL PARTS·······················BACK COVER

Models

MSZ-A18YV  -
MSZ-A24YV  -
MSZ-A26YV  -

E1

E1

E1

SPLIT-TYPE AIR CONDITIONERS

MSZ-A18YV  -
MSZ-A24YV  -
MSZ-A26YV  -

E1

E1

E1

NOTE:

This service manual describes technical data of the indoor unit.
•Refer to the service manual OB346 when MSZ-A18YV  -

, MSZ-A24YV  -

or MSZ-A26YV  -

is connected with MUZ-A18YV  -

, MUZ-A24YV  -

or MUZ-A26YV  -

.

•Refer to the service manual OB319 when MSZ-A18YV  -

, MSZ-A24YV  -

or MSZ-A26YV  -

is connected with MXZ-A26WV  -

or MXZ-A32WV  -

as multi system units.

E1

E1

E1

E1

E1

E1

E1

E1

E1

E1

E1

No. OB345

REVISED EDITION-A

Revision A :

• Parts numbers of indoor fan motor and motor band have 

been changed.

• Another type of the electronic control P.C.board (TYPE 2)

has been added to the original one (TYPE 1).
They are both compatible with MSZ-A18/24/26YV-

.

• Some descriptions have been modified.

E

Please void OB345.

INDOOR UNIT

Summary of Contents for MSZ-A18YV

Page 1: ... technical data of the indoor unit Refer to the service manual OB346 when MSZ A18YV MSZ A24YV or MSZ A26YV is connected with MUZ A18YV MUZ A24YV or MUZ A26YV Refer to the service manual OB319 when MSZ A18YV MSZ A24YV or MSZ A26YV is connected with MXZ A26WV or MXZ A32WV as multi system units E1 E1 E1 E1 E1 E1 E1 E1 E1 E1 E1 No OB345 REVISED EDITION A Revision A Parts numbers of indoor fan motor an...

Page 2: ...reless remote controller Felt tape Used for left or left rear piping 1 7 1 2 2 1 1 MSZ A18YV MSZ A24YV MSZ A26YV E1 E1 E1 Use the specified refrigerant only Never use any refrigerant other than that specified Doing so may cause a burst an explosion or fire when the unit is being used serviced or disposed of Correct refrigerant is specified in the manuals and on the spec labels provided with our pr...

Page 3: ...he 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 button Horizontal vane button CLOCK SET button LONG button WIDE VANE button Vertical vane button Indication of remote controller mo...

Page 4: ... C Wet bulb temperature 24 C Heating Indoor Dry bulb temperature 20 C Wet bulb temperature 15 5 C Outdoor Dry bulb temperature 7 C Wet bulb temperature 6 C Indoor Outdoor piping length 5m w Reference value 1 Measured under rated operating frequency Indoor model Function Power supply Air flow High Med Low Power outlet Running current 1 Power input 1 Auxiliary heater Power factor 1 Fan motor current...

Page 5: ...DH1N 3P INDOOR UNIT Item Model Indoor fan capacitor Fuse Vane motor Varistor Solid state relay Terminal block Indoor fan motor thermal fuse C11 F11 MV1 MV2 NR11 SR141 TB MSZ A24YV E1 MSZ A18YV E1 MSZ A26YV E1 145 Specifications and rating conditions of main electric parts 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 0002 MICRO BAR BAND CENT...

Page 6: ... O D Installation plate Wall hole 75 Wireless remote controller Installation plate Indoor unit Liquid line 6 35 0 5m Gas line 12 0 43m Insulation 50 O D 32 I D Liquid line 9 52 0 5m Gas line 12 0 43m Insulation 50 O D 32 I D for MSZ A18 A24YV for MSZ A26YV Power supply cord Lead to right 2 0m Lead to left 1 0m INDOOR UNIT MSZ A18YV MSZ A24YV MSZ A26YV E1 E1 E1 Unit mm OB345A ...

Page 7: ...3 SR141 TB NAME INDOOR COIL THERMISTOR MAIN INDOOR COIL THERMISTOR SUB SOLID STATE RELAY TERMINAL BLOCK INDOOR UNIT TB TAB12 3 3 REMOTE CONTROLLER RECEIVER P C BOARD DISPLAY P C BOARD 102 CN 101 CN RED BLU MV2 CN201 3 2 1 BRN L N 3 F11 ELECTRONIC CONTROL P C BOARD NR11 CN211 CN 111 RT11 RT12 15 MV2 CN 151 CN112 1 2 3 4 RT13 MV1 TRANS HIC1 C11 121 CN 1 3 4 SR141 3 RED WHT BRN YLW GRY BLK GRN YLW TO...

Page 8: ...SZ A18YV E1 INDOOR UNIT Indoor heat exchanger Room temperature thermistor RT11 Refrigerant pipe 12 7 with heat insulator Flared connection Flared connection Indoor coil thermistor RT12 main Refrigerant pipe 6 35 with heat insulator Distributor MSZ A24YV E1 INDOOR UNIT Indoor heat exchanger Room temperature thermistor RT11 Refrigerant pipe 15 88 with heat insulator Flared connection Flared connecti...

Page 9: ...es before modification The board has a print as shown below 7 1 TIMER SHORT MODE For service set time can be shortened by short circuit of JPG and JPS on the electronic control P C board The time will be shortened as follows 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 a...

Page 10: ...ated with the remote controller If main power is turned off or a power failure occurs while AUTO START STOP timer is active the timer setting is cancelled 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 hom...

Page 11: ...r malfunction In this case replace the batteries to operate the remote controller normally 1 Remove the front lid and insert batteries Then reattach the front lid MSZ A18YV MSZ A24YV MSZ A26YV E1 E1 E1 RESET button Insert the negative pole of the batteries first Check if the polarity of the battereis is correct 2 Press the RESET button with a thin instrument and then use the remote controller INFO...

Page 12: ...l operation in COOL or HEAT mode Refer to Check of R V coil Flash on and off at 0 5 second interval Cause Indoor Outdoor unit Mis wiring or trouble of serial signal 2 time flash Cause Indoor unit Trouble of room temp erature indoor coil thermistor 3 time flash Cause Indoor unit Trouble of indoor fan motor 5 time flash Cause Outdoor unit Outdoor power system abnormality 6 time flash Cause Outdoor u...

Page 13: ...d Outdoor unit does not operate Outdoor unit does not operate Check the indoor electronic control P C board 5 6 Outdoor power system Outdoor thermistors Outdoor control system When compressor has stopped due to over current protection or start up failure protection 3 times in a row within 5 seconds after start up Thermistor short Thermistors are abnormal when they short after compressor start up T...

Page 14: ...RT13 sub Horizontal vane motor MV1 Vertical vane motor MV2 Motor part Sensor part Measure the resistance between the terminals with a tester Part temperature 10 C 30 C Color of lead wire BRN YLW YLW GRY Abnormal Remain 0V or 5V Normal 4 5 5 5V Measure the voltage power ON When fan revolved one time 0V 5V 0V Approx Normal 282 306 Abnormal Open or short circuit Measure the resistance between the ter...

Page 15: ...ctor CN301 No 1 and No 3 when the remote controller button is pressed Is the voltage approximately 4 VDC 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 the the remote controller visible...

Page 16: ... 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 Turn OFF the power supply Turn OFF the power supply Varistor NR11 I...

Page 17: ...tdoor connecting wire Turn ON the power supply Indoor outdoor unit Press the EMERGENCY OPERATION switch Is there amplitude of 5 to 10V DC between outdoor terminal block N and 3 after 3 minutes for confirmation of serial signal Yes light up or OFF After 3 minutes is mis wiring indicated on OPERATION INDICATOR lamp on the indoor unit Yes No Turn OFF inverter controlled lighting equipment Turn OFF th...

Page 18: ... switch 12 VDC Indoor coil thermistor RT12 main RT13 sub Room temperature thermistor RT11 Resistance k Room temperature ther mistor RT11 To disable Auto restart function solder jumper wire to JR07 Refer to 7 3 Indoor coil thermistor RT13 sub R132 Receiver P C board Indoor coil thermistor RT12 main w There are 2 types of electronic control P C boards TYPE1 TYPE2 They are both compatible with MSZ A1...

Page 19: ...ration switch CN121 Room temperature thermistor RT11 R132 To disable Auto restart function solder jumper wire to JR07 Refer to 7 3 Vane motor power supply CN151 12 VDC Indoor coil thermistor RT12 main RT13 sub Room temperature thermistor RT11 Power supply input TYPE 2 Receiver P C board CN301 TEST POINT DIAGRAM AND VOLTAGE MSZ A18YV MSZ A24YV MSZ A26YV Indoor electronic control P C board E1 E1 E1 ...

Page 20: ...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 Screw of the V A clamp Indoor electronic control P C board Vane motor connector Fan motor connectors Screws of the earth wire Screws Screw of the electrical cover R L holder Screw of the terminal block Receiver P C board 2 Removing the...

Page 21: ...ain hose from the nozzle assembly and remove the nozzle assembly 6 Remove the screws of the vane motor and disconnect the connector 7 Remove the vane motor Screws fixing the fan 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 and remove the nozzle assembly 4 Rem...

Page 22: ...bol 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 1 1 1 4 3 1 2 1 1 1 1 1 4 3 1 2 1 1 10 2 INDOOR UNIT HEAT EXCHANGER 2 4 5 7 6 1 10 8 11 12 3 CATCH SCREW CAP E02 851 620 E02 819 620 E02 179 667 E02 138 666 E02 151 667 E02 527 667 INDOOR HEAT EXCHANGER INDOOR HEAT EXCHANGER UNION GAS UNION GAS UNION LIQUID UNION LI...

Page 23: ...T SET LEFT Symbol in Wiring Diagram Q ty unit 3 15A RIGHT LEFT UP DOWN Remarks Part No w1 Refer to page 18 and 19 No Part Name F11 NR11 MF MF MV2 MV1 RT11 TB RT12 RT13 RT12 RT13 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 1 1 2 1 1 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 1 1 1 1 1 AUTO RESTART Including No 17 AUTO RESTART Including No 17 AUTO RESTART Including No 17 MSZ...

Page 24: ...EANING FILTER AIR CLEANING FILTER removes fine dust of 0 01 micron from air by means of static electricity Normal life of AIR CLEANING FILTER is 4 months However when it becomes dirty replace it as soon as possible Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet DO NOT reuse AIR CLEANING FILTER even if it is washed DO NOT remove or attach AIR CL...

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