Mitsubishi Electric MSH-CB50VB- E1 Manuale utente

CONTENTS

1. TECHNICAL CHANGES ····································2

2. PART NAMES AND FUNCTIONS······················2

3. SPECIFICATION·················································4

4. NOISE CRITERIA CURVES·······························4

5. OUTLINES AND DIMENSIONS ·························5

6. WIRING DIAGRAM ············································6

7. REFRIGERANT SYSTEM DIAGRAM················6

8. SERVICE FUNCTIONS ······································7

9. TROUBLESHOOTING·········································9

10. DISASSEMBLY INSTRUCTIONS·····················17

11. PARTS LIST······················································19

12. OPTIONAL PARTS···········································21

Wireless type

Models

MSH-CB50VB - E1

No. OB440

SPLIT-TYPE, HEAT PUMPAIR CONDITIONERS

MSH-CB50VB

NOTE:

This service manual describes technical data of the indoor unit.

Outdoor unit service manual

MUH-GA·VB Series (OB368)

SERVICE MANUAL

INDOOR UNIT

OB440-1.qxp 05.12.6 9:20 AM Page 1

TECHNICAL CHANGES

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

Front panel

MSH-CB50VB

MSH-GA50VB - ➔MSH-CB50VB -

1. Panel logo has been changed.

E1E1

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)

MSH-CB50VB

OB440-1.qxp 05.12.6 9:20 AM Page 2

REMOTE CONTROLLER

MSH-CB50VB

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.

OB440-1.qxp 05.12.6 9:20 AM Page 3

NOISE CRITERIA CURVES

SPECIFICATION

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

MSH-CB50VB

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

Remote controller model

K/h

A(kW)

rpm

MSH-CB50VB

Single phase

230V, 50Hz

768/642/528

0.3

—

0.30

RC4V32-AA

WHT-BLK 293

BLK-RED 146

1,100O325O258

42/38/34

1,070/920/780

KP0A

Cooling Heating

Electrical

data

Fan

motor

Special

remarks

Capacity

NOTE: Test conditions are based on ISO 5151.

Cooling : Indoor DB27°C WB19°C Heating : Indoor DB20°C WB 15.5°C

Outdoor DB35°C WB(24°C) Outdoor DB 7°C WB 6°C

Indoor-Outdoor piping length : 5m

INDOORUNIT WALL

MICROPHONE

0.8m

OB440-1.qxp 05.12.6 9:20 AM Page 4

OUTLINES AND DIMENSIONS

258

162

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

Power supply cord

Lead to right 2.0m

Lead to left 1.0m

INDOOR UNIT

MSH-CB50VB Unit: mm

OB440-1.qxp 05.12.6 9:20 AM Page 5

REFRIGERANT SYSTEM DIAGRAM

WIRING DIAGRAM

Refrigerant flow in cooling

Refrigerant flow in heating

MSH-CB50VB

INDOOR UNIT

Indoor

heat

exchanger

Room temperature

thermistor

RT11

Refrigerant pipe [12.7

(with heat insulator)

Flared connection

Indoor coil

thermistor

RT12

Refrigerant pipe [6.35

(with heat insulator)

Distributor

Unit:mm

MSH-CB50VB

INDOOR UNIT

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 (T3.15AL250V)

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

SR141

NAME

INDOOR COIL THERMISTOR

SOLID STATE RELAY

TERMINAL BLOCK

TAB12

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

MV1

HIC1

C11

121

SR141

RED

WHT

BRN

YLW

GRY

BLK

GRN/YLW

BLU

BRN

TO OUTDOOR

UNIT

CONNECTING

12V

CIRCUIT

BREAKER

POWER

SUPPLY

CORD

~/N 230V

50Hz

OB440-1.qxp 05.12.6 9:20 AM Page 6

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. The “AUTO RESTART FUNCTION” sets to work the moment power

has restored after power failure.Then, the unit will restart automatically. However if the unit is operated in “I FEEL CON-

TROL” mode before power failure, the operation is not memorized. In “I FEEL CONTROL” mode, the operation is decided

by the initial room temperature.

8-3. 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

8-2. 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 :

8-1. 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 remodelling, take out the bat-

teries and press the

OPERATE/STOP(ON/OFF)button

twice or 3 times at first.

After finish remodelling, put back

the batteries then press the

RESET button.

MSH-CB50VB

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 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.

Remote controller model : KP0A J2

OB440-1.qxp 05.12.6 9:20 AM Page 7

How to release “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 10.2.)

3Solder jumper wire to JR07 on the indoor

electronic control P.C. board. (Refer to 9-6.)

JR07

IC152

CN151

CN112

CN111

CN121

SW1

IC101

RA102

C11

CN201

CN211

TAB12

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 remote controller 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.

OB440-1.qxp 05.12.6 9:20 AM Page 8

TROUBLESHOOTING

9-1. 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, be sure to turn off the unit first with the remote controller, and then after confirm-

ing the horizontal vane is closed, turn off the breaker and / or disconnect the power plug.

(2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic

control P.C. board.

(3) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the

components.

(4) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.

3. Troubleshooting procedure

(1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and 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 troubleshooting, refer to 9-2. and 9-3.

4. How to replace batteries

Weak batteries may cause the remote controller malfunction.

In this case, replace the batteries to operate the remote controller normally.

1Remove the front lid and insert batteries.

Then reattach the front lid.

Lead wiring Housing point

MSH-CB50VB

RESET button

Insert the negative pole

of the batteries first.

Check if the polarity of

the batteries are correct.

2Press the RESET button with tip end of ball point

pen or the like, and then use the remote controller.

NOTE : If the RESET button is not pressed, the remote controller may not operate correctly.

OB440-1.qxp 05.12.6 9:20 AM Page 9

Start

Indoor unit

operates.

Outdoor unit

doesn't

operate.

Indoor unit

doesn't receive

the signal from

remote controller.

Indoor unit

operates.

Outdoor unit

doesn't operate

normally.

OPERATION INDICATOR

lamp on the indoor unit is

flashing on and off.

Outdoor unit

operates in

only Test Run

operation.

Outdoor unit

doesn't

operate

even in

Test Run

operation.

Indoor unit

operates, when

the EMERGENCY

OPERATION

switch is pressed.

Indoor unit

doesn't operate,

when the

EMERGENCY

OPERATION

switch is pressed.

Check room

temperature

thermistor.

Refer to 9-6.

"Test point

diagram and

voltage".

Refer to

"Check of

outdoor unit".

Refer to 9-5.B

"Check of

remote controller

and receiver

P.C. board".

Flash on and

off at 0.5-

second

intervals

Cause:

Indoor/

Outdoor unit

• Mis-wiring

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

6-time flash

Cause:

Outdoor unit

• Trouble of

thermistor

in outdoor

unit

7-time flash

Cause:

Outdoor unit

• Trouble of

outdoor

control

system

Refer to

9-5. D

"How to

check

mis-wiring

(When

outdoor unit

doesn't

work)".

Check room

temperature

thermistor

and indoor

coil thermis-

tor.

Refer to 9-6.

"Test point

diagram and

voltage".

Refer to

9-5. A

"Check of

indoor fan

motor".

Refer to

"Check of

outdoor

thermistor".

Replace the

deicer

P.C. board.

4-time flash

Cause:

Indoor unit

• Trouble of

indoor unit

control

system

Replace the

indoor

electronic

control

P.C. board.

As for outdoor unit , refer to service manual OB368.

1. Check indoor /

outdoor

connecting wire.

2. Refer to 9-5.C

"Check of indoor

electronic control

P.C. board".

Outdoor unit

doesn't

stop even

if indoor unit

stops.

Unit doesn't

operate

normal

operation in

COOL or

HEAT mode.

Refer to

"Check of

outdoor unit".

Refer to

"Check of

R.V. coil".

9-2. Instruction of troubleshooting

OB440-1.qxp 05.12.6 9:20 AM Page 10

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