Mitsubishi Electric MSZ-GB50VA Series Bedienungsanleitung

SERVICE MANUAL

CONTENTS

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

2. PART NAMES AND FUNCTIONS······················3

3. SPECIFICATION·················································5

4. NOISE CRITERIA CURVES·······························6

5. OUTLINES AND DIMENSIONS ·························7

6. WIRING DIAGRAM ············································8

7. REFRIGERANT SYSTEM DIAGRAM················8

8. SERVICE FUNCTIONS ······································9

9. TROUBLESHOOTING······································10

10. DISASSEMBLY INSTRUCTIONS·····················24

11. RoHS PARTS LIST···········································27

12. OPTIONAL PARTS···········································30

Wireless type

Models

MSZ-GB50VA - E1

SPLIT-TYPE, HEAT PUMPAIR CONDITIONERS

MSZ-GB50VA

NOTE:

• This service manual describes technical data of the indoor units.

INDOOR UNIT

Outdoor unit service manual

MUZ-GB·VA series (OB455)

MXZ-A·VA series (OB377)

MXZ-8A140VA (OC316)

No. OB454

OB454qxp 06.3.22 4:30 PM Page 1

1TECHNICAL CHANGES

MSZ-GA50VA - ➔MSZ-GB50VA -

Indoor unit size has been changed. (W1,100 mm x H325 mm x D258 mm ➔ W780 mm x H298 mm x D210 mm)

E1E1

OB454qxp 06.3.22 4:30 PM Page 2

PART NAMES AND FUNCTIONS

INDOOR UNIT

MSZ-GB50VA

Line flow fan

Air outlet

Vertical vane

Air inlet

Display section

Front panel

Panel

Heat exchanger

Horizontal vane

Operation section

(When the front panel is opened)

Remote controller

Remote control

receiving section

Catechin air filter

Air cleaning filter (Option)

(Anti-Allergy Enzyme

Filter,Blue bellows type)

Emergency operation switch

Fan guard

Operation Indicator

lamp

OB454qxp 06.3.22 4:30 PM Page 3

ACCESSORIES

Installation plate

Installation plate fixing screw 4 o25 mm

Remote controller holder

Fixing screw for 33.5 o1.6 mm (Black)

Battery (AAA) for remote controller

Wireless remote controller

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

REMOTE CONTROLLER

ON-TIMER button

CLOCK SET button

TIME SET buttons

FORWARD button

BACKWARD button

OFF-TIMER button

(This diagram shows an overall view.)

Open the front lid.

RESET button VANE CONTROL button

Signal transmitting section

Operation display section

Temperature buttons

OPERATE/STOP

(ON/OFF) button

FAN SPEED CONTROL button

OPERATION SELECT button

ECONO COOL button

Indication of

remote controller

model is on back

MSZ-GB50VA

OB454qxp 06.3.22 4:30 PM Page 4

SPECIFICATION

MSZ-GB50VA

T3.15AL 250V

MSBPC20M16 12V DC 250"(at 25˚C)

ERZV14D471

INDOOR UNIT

Item

Fuse

Horizontal vane motor

Varistor

Terminal block

(F11)

(MV)

(NR11)

(TB)

Specifications and rating conditions of main electric parts

MSZ-GB50VA

Indoor model

Function

Power supply Single phase

230V,50Hz

684

654/445/414

0.35

RC0J30-CC

780O298O210

1,300

1,200/1,100/900

KM05B

Cooling

48/44/38/32

Heating

48/42/36/30

Air flow(Super High)

Air flow(High/Med./Low)

Power outlet

Running current ✽1

Power input ✽1

Power factor ✽1

Fan motor current ✽1

Model

Dimensions WOHOD

Weight

Air direction

Sound level(Super High/High/Med./Low)

Fan speed(Super High)

Fan speed(High/Med./Low)

Fan speed regulator

Remote controller model

K/h

dB(A)

rpm

Electrical

data

Fan motor

Special

remarks

Capacity

NOTE : Test conditions are based on ISO 5151.

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

Outdoor Dry-bulb temperature 35:Wet-bulb temperature 24:

Heating : Indoor Dry-bulb temperature 20:Wet-bulb temperature 15:

Outdoor Dry-bulb temperature 7:Wet-bulb temperature 6:

Refrigerant piping length (one way): 5m

✽1 Measured under rated operating frequency.

OB454qxp 06.3.22 4:30 PM Page 5

OUTLINES AND DIMENSIONS

Unit : mm

INDOOR UNIT

155 155

335 320

41.5 215

42.5 214

3287.5

7055

5555 225 225

or more7

100

106

298

102624.5

780

210 5

53.5

159

14273.5

234

Air in

Air out

Wall hole [65

Indoor unit

Installation plate

11x20 Oblong hole

11x26 Oblong hole

10 or more

75 or more

66 or more

75 or more

In case of left, left back, or

left under piping (using spacer),

115 or more

Insulation [28

Drain hose [16

(Connected part O.D)

Liquid line [8.0-0.5m

Gas line [9.52-0.43m

Insulation [35 O.D

[19 I.D

{

Required space (Indoor unit)

MSZ-GB50VA

OB454qxp 06.3.22 4:30 PM Page 6

4NOISE CRITERIA CURVES

10 63 125 250 500 1000 2000 4000 8000

OCTAVE BAND SOUND PRESSURE LEVEL, 0dB=20µPa

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:

MSZ-GB50VA

INDOOR UNIT WALL

MICROPHONE

0.8m

OB454qxp 06.3.22 4:30 PM Page 7

6WIRING DIAGRAM

REFRIGERANT SYSTEM DIAGRAM

MSZ-GB50VA

Indoor

heat

exchanger

Flared connection

Room temperature

thermistor

RT11

Indoor coil

thermistor

RT13(sub)

Flared connection

Refrigerant flow in cooling

Refrigerant flow in heating

Refrigerant pipe [12.7

(with heat insulator)

Refrigerant pipe [6.35

(with heat insulator)

Indoor coil

thermistor

RT12(main)

Distributor

INDOOR UNIT

Unit : mm

INDOOR UNIT

SYMBOL

DB111

F11

NR11

SYMBOL

RT11

RT12

RT13

T111

NAME

DIODE STACK

FUSE (T3.15AL250V)

INDOOR FAN MOTOR

VANE MOTOR (HORIZONTAL)

VARISTOR

NAME

ROOM TEMPERATURE THERMISTOR

INDOOR COIL THERMISTOR (MAIN)

INDOOR COIL THERMISTOR (SUB)

TRANSFORMER

TERMINAL BLOCK

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

MSZ-GB50VA

POWER MONITOR

RECEIVER P.C.BOARD

230V~

BLU

INDOOR ELECTRONIC

CONTROL P.C. BOARD

SW P.C.

BOARD

INTERLOCK

SWITCH(FAN)

TO OUTDOOR

UNIT

CONNECTING

BLK

RED

TB TAB3

DB111

NR11

F11

105(T)

101(A)

12-24V

RT13

1R1

GRN

LD104

CN201

151

T111

RED

WHT

111

112

CN211 BLU

YLW

BLK

RT11

RT12

OB454qxp 06.3.22 4:30 PM Page 8

SERVICE FUNCTIONS

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.

8-1. TIMER SHORT MODE

For service, set time can be shortened by short circuit of JPG and JPS the electronic control P.C. board.

The time will be shortened as follows. (Refer to 9-7.)

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.)

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

Table 1

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.

How to modify the remote controller P.C. board

Remove batteries before modification.

The board has a print as shown below :

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 batteries 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.

MSZ-GB50VA

OB454qxp 06.3.22 4:30 PM Page 9

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

confirming 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.

Housing point

Lead wiring

MSZ-GB50VA

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 appliance 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.

JR07

CN151 CN211CN112 CN1R1

8-3. AUTO RESTART FUNCTION

When the indoor unit is controlled with the remote controller, the operation mode, the 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.

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.)

How to release “AUTO RESTART FUNCTION”

1Turn off the main power for the unit.

2Solder the Jumper wire JR07 on the indoor electronic control P.C. board. (Refer to 9-7.)

OB454qxp 06.3.22 4:30 PM Page 10

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