Mitsubishi Electric MSZ-A18YV Manuale utente

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

SPLIT-TYPE AIR CONDITIONERS

MSZ-A18YV -

MSZ-A24YV -

MSZ-A26YV - 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.

E1E1

E1E1E1

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.

Please void OB345.

INDOOR UNIT

PART NAMES AND FUNCTIONS

INDOOR UNIT

Grille

(When the grille is opened)

Remote controller

Operation section Display section

Emergency operation switch

Operation indicator lamp

Air inlet

To Breaker

Power supply cord

Remote control

receiving section

Air cleaning filter (option)

(White bellows type)

Horizontal vane

Vertical vanes

Catechin air filter

Remote control

receiving section

MSZ-A18YV -

MSZ-A24YV -

MSZ-A26YV - E1

ACCESSORIES

Indoor unit

Installation plate

Installation plate fixing screw 4 o25 mm

Remote controller holder

Fixing screw for 3o3.5 o1.6 mm (Black)

Battery (AAA) for remote controller

Wireless remote controller

Felt tape (Used for left or left-rear piping)

MSZ-A18YV -

MSZ-A24YV -

MSZ-A26YV -

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 products.

We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by

failure to follow the instructions.

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.

OB345A

REMOTE CONTROLLER

MSZ-A18YV -

MSZ-A24YV -

MSZ-A26YV - E1

ON/OFF

TOO

COOL

TOO

WARM

ON/OFF

FAN

TOO

WARM TOO

COOL

VANE

MODE

ECONO COOL

STOP

START

HR.

MIN.

WIDE VANE

LONG

I FEEL

COOL

HEAT

DRY

CLOCK

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 button

(Horizontal vane button)

CLOCK SET button

LONG button

WIDE VANE button

(Vertical vane button)

Indication of remote controller

model is on back.

OB345A

SPECIFICATION

Indoor model

Function

Power supply

Air flow

(High/Med. /Low )

Power outlet

Running current

Power input

Auxiliary heater

Power factor

Fan motor current

Model

Winding

resistance(at 20:)

Dimensions WOHOD

Weight

Air direction

Sound level(High/Med. /Low )

Fan speed(High/Med. /Low )

Fan speed regulator

Thermistor RT11(at 25:)

Thermistor RT12(at 25:)

Thermistor RT13(at 25:)

Remote controller model

K/h

A(kW)

rpm

MSZ-A18YV - E1

Single phase

230V, 50Hz

852/690 /498

0.30

—

0.30

RC4V32-AA

WHT-BLK 293

BLK-RED 146

1,100O325O258

43/38 /31

1,120/940 /720

KP0A

Cooling Heating

MSZ-A24YV - E1

Single phase

230V, 50Hz

0.34

—

0.34

RC4V40-AA

WHT-BLK 138.2

BLK-RED 159.0

1,100O325O258

48/40 /32

KP0A

Cooling

1,032/768 /522

1,310/1030 /750

Heating

1,032/786 /522

1,310/1050 /750

Electrical

data

Fan

motor

Special

remarks

Capacity

w w

NOTE: Test conditions are based on ISO 5151.

Cooling : Indoor Dry-bulb temperature 27°C Wet-bulb temperature 19°C

Outdoor Dry-bulb temperature 35°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

wReference value

1 Measured under rated operating frequency.

Indoor model

Function

Power supply

Air flow

(High/Med. /Low )

Power outlet

Running current

Power input

Auxiliary heater

Power factor

Fan motor current

Model

Winding

resistance(at 20:)

Dimensions WOHOD

Weight

Air direction

Sound level(High/Med. /Low )

Fan speed(High/Med. /Low )

Fan speed regulator

Thermistor RT11(at 25:)

Thermistor RT12(at 25:)

Thermistor RT13(at 25:)

Remote controller model

K/h

A(kW)

rpm

MSZ-A26YV - E1

Single phase

230V, 50Hz

0.34

—

0.34

RC4V40-AA

WHT-BLK 138.2

BLK-RED 159.0

1,100O325O258

48/40 /33

KP0A

Cooling

1,032/798 /564

1,310/1,060 /800

Heating

1,032/816 /564

1,310/1,080 /800

Electrical

data

Fan

motor

Special

remarks

Capacity

w w

•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.

E1E1

E1E1E1

OB345A

NOISE CRITERIA CURVES

10 63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

BAND CENTER FREQUENCIES, Hz

Test conditions,

Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:

APPROXIMATE

THRESHOLD OF

HEARING FOR

CONTINUOUS

NOISE

SPL(dB(A)) LINE

High

FAN SPEED

Heating : Dry-bulb temperature 20: Wet-bulb temperature 15.5:

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

MSZ-A18YV - E1 MSZ-A24YV -

MSZ-A26YV - E1

2.5+ 440V

250V 3.15A

MP20/MP20

TNR10V511K410

S201DH1N

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

10 63 125 250 500 1000 2000 4000 8000

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

APPROXIMATE

THRESHOLD OF

HEARING FOR

CONTINUOUS

NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

Test conditions,

Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:

SPL(dB(A)) LINE

High

FAN SPEED

Heating : Dry-bulb temperature 20: Wet-bulb temperature 15.5:

INDOORUNIT

WALL

MICROPHONE

0.8m

OB345A

OUTLINES AND DIMENSIONS

258

159

7.5

315

255.547

2.5

98 173

98 173414.5 414.5

253

791

1068

1100

325

Air out

Air in

Insulation [28

Drain hose [16

(Connected part 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 Unit: mm

OB345A

WIRING DIAGRAM

MSZ-A18YV - E1 MODEL WIRING DIAGRAM

INDOOR UNIT

CN112

1RT12

4RT13

12V

TO OUTDOOR

UNIT

CONNECTING

BRN

BLU

GRN/YLW

BLK

GRY

YLW

BRN

WHT

RED

SR141

121

C11

HIC1

TRANS

MV1

151

MV2

RT11

111

CN211

NR11

ELECTRONIC CONTROL P.C. BOARD

F11

LBRN

CN201

MV2

BLU

RED

101

102

DISPLAY

P.C. BOARD

RECEIVER

P.C. BOARD

REMOTE

CONTROLLER

TAB12

POWER

SUPPLY

CORD

~/N 230V

50Hz

CIRCUIT

BREAKER

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.

: Connector

: Terminal block

NOTES:

SYMBOL

C11

F11

HIC1

NAME

INDOOR FAN CAPACITOR

FUSE (3.15A)

DC/DC CONVERTER

INDOOR FAN MOTOR (INNER FUSE)

SYMBOL

MV1

MV2

NR11

RT11

NAME

VANE MOTOR (HORIZONTAL)

VANE MOTOR (VERTICAL)

VARISTOR

ROOM TEMPERATURE THERMISTOR

SYMBOL

RT12

RT13

SR141

NAME

INDOOR COIL THERMISTOR (MAIN)

INDOOR COIL THERMISTOR (SUB)

SOLID STATE RELAY

TERMINAL BLOCK

INDOOR UNIT

TAB12

3 3

REMOTE

CONTROLLER

RECEIVER

P.C. BOARD

DISPLAY

P.C. BOARD

102

CN 101

RED

BLU

MV2

CN201

BRN

F11

ELECTRONIC CONTROL P.C. BOARD

NR11

CN211

111 RT11

RT12

MV2

151

CN112

4RT13

MV1

TRANS

HIC1

C11

121

SR141

RED

WHT

BRN

YLW

GRY

BLK

GRN/YLW

TO OUTDOOR

UNIT

CONNECTING

12V MF

CIRCUIT

BREAKER

POWER

SUPPLY

CORD

~/N 230V

50Hz

BLU

BRN

SYMBOL

SR141

SYMBOL

MV2

NR11

RT11

RT12

RT13

SYMBOL

C11

F11

HIC1

MV1

INDOOR FAN CAPACITOR

FUSE (3.15A)

DC/DC CONVERTER

INDOOR FAN MOTOR (INNER PROTECTOR)

VANE MOTOR (HORIZONTAL)

VANE MOTOR(VERTICAL)

VARISTOR

ROOM TEMPERATURE THERMISTOR

INDOOR COIL THERMISTOR (MAIN)

INDOOR COIL THERMISTOR (SUB)

SOLID STATE RELAY

TERMINAL BLOCK

NAME NAME NAME

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.

: Connector

: Terminal block

NOTES:

MSZ-A24YV -

MSZ-A26YV - E1

E1 MODELS WIRING DIAGRAM

OB345A

REFRIGERANT SYSTEM DIAGRAM

MSZ-A26YV - E1

INDOOR UNIT

Indoor

heat

exchanger

Flared connection

Room temperature

thermistor

RT11

Indoor coil

thermistor

RT13(sub)

Flared connection

Refrigerant pipe [15.88

(with heat insulator)

Refrigerant pipe [9.52

(with heat insulator)

Indoor coil

thermistor

RT12(main)

Strainer

#50

Refrigerant flow in cooling

Refrigerant flow in heating

MSZ-A18YV - E1

INDOOR UNIT

Indoor

heat

exchanger

Room temperature

thermistor

RT11

Refrigerant pipe [12.7

(with heat insulator)

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

Indoor coil

thermistor

RT12(main)

Refrigerant pipe [6.35

(with heat insulator)

Distributor

Unit:mm

Indoor coil

thermistor

RT13(sub)

Indoor coil

thermistor

RT13(sub)

OB345A

SERVICE FUNCTIONS

When the indoor unit is controlled with the remote controller, the operation mode, set temperature, and the fan speed are

memorized by the indoor electronic control P.C.board. “Auto restart function” automatically starts operation in the same

mode just before the shutoff of the main power. However if the unit is operated in “I FEEL CONTROL” mode before power

failure, the operation is not memorized. In “I FEEL CONTROL” mode, the operation is decided by the initial room tempera-

ture.

7-3. AUTO RESTART FUNCTION

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

Solder J1

–

3 units operation

Same as at left

Solder J2

–

4 units operation

Same as at left

Solder both J1 and J2

7-2. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION

A maximum of 4 indoor units with wireless remote controllers can be used in a room.

In this case, to operate each indoor unit individually by each remote controller, P.C. boards of remote controller must be

modified according to the number of the indoor unit.

How to modify the remote controller P.C. board

Remove batteries 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 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 modification, press the RESET button.

NOTE : For modification, take out the bat-

teries and press the

OPERATE/STOP (ON/OFF) but-

ton 2 or 3 times at first.

After finish modification, put back

the batteries then press the

RESET button.

MSZ-A18YV -

MSZ-A24YV -

MSZ-A26YV - E1

Remote controller model : KP0A J2

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 accept the signal from the remote controller that has been assigned to the indoor unit once they are

set. The setting will be cancelled if the breaker has turned off, or the power supply has shut down.

Please conduct the above setting once again after the power has restored.

OB345A

How to disable “AUTO RESTART FUNCTION”

1Turn off the main power for the unit.

2Pull out the electronic control P.C. board, the receiver P.C. board and the display P.C.board. (Refer to page 20.)

3Solder jumper wire to the RESISTOR JR07 on the indoor electronic control P.C. board. (Refer to page 18. and 19)

Operation

1If the main power has been cut, the operation settings remain.

2After the power is restored, the unit restarts automatically according to the memory.(However, it takes at least 3 minutes

for the compressor to start running.)

NOTE

•The operation settings are memorized when 10 seconds have passed after the indoor unit was operated 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 home appliances not to turn on at the same

time.

•When some air conditioners are connected to the same supply system, if they are operated before power failure, the

starting current of all the compressors may flow simultaneously at restart.

Therefore, the special counter-measures are required to prevent the main voltage-drop or the rush of the starting current

by adding to the system that allows the units to start one by one.

OB345A

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