Mitsubishi Electric MS-GD08ND Manuale utente

SERVICE MANUAL

CONTENTS

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

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

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

4. OUTLINES AND DIMENSIONS ........................ 5

5. WIRING DIAGRAM ............................................ 6

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

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

8. TROUBLESHOOTING ..................................... 10

9. DISASSEMBLY INSTRUCTIONS ................... 19

Wireless type

Models

INDOOR UNIT

Outdoor unit service manual

MU-GD•ND Series (TBH016)

SPLIT-TYPE, AIR CONDITIONERS

MS-GD08ND- C1

MS-GD10ND- C1

MS-GD12ND- C1

PARTS CATALOG (TBB014)

No. TBH014

NOTE:

• RoHS compliant products have <G> mark on the spec name plate.

MS-GD08ND-

MS-GD10ND-

MS-GD12ND-

1 TECHNICAL CHANGES

MS-A08ND- C1 ➔ MS-GD08ND- C1

MS-A12ND- C1 ➔ MS-GD12ND- C1

1. Indoor unit has been changed.

• Front panel has been changed. (Flat Flat Shining)

2. Terminal block has been changed. 3P (L~, N~, 2~) 4P (L~, N~, 2~, Earth)

MS-A10ND- C1 ➔ MS-GD10ND- C1

1. Indoor unit has been changed.

• Front panel has been changed. (Flat Flat Shining)

ACCESSORIES

PART NAMES AND FUNCTIONS

INDOOR UNIT

MS-GD08ND- C1

MS-GD10ND- C1

MS-GD12ND- C1

Emergency operation switch

Fan

Air outlet

Vertical vanes

Air inlet

Remote control

receiving section

Display section

Air cleaning filter

(white bellows type)

Catechin air filter

(with deodorizing)

Front panel

Panel

Horizontal vane

Operation section

(When the front panel is opened)

Remote controller

Operation indicator lamp

Remote control

receiving section

MS-GD08ND- C1

MS-GD10ND- C1

MS-GD12ND- C1

1 Installation plate 1

2 Installation plate fixing screw 4 x 25 mm 5

3 Remote controller holder 1

4 Fixing screw for 3 3.5 x 16 mm (Black) 2

5 Battery (AAA) for remote controller 2

6 Wireless remote controller 1

7 Felt tape (Used for left or left-rear piping) 1

8 Air cleaning filter 2

SPECIFICATION

REMOTE CONTROLLER

ON/OFF

RESET

TOO

WARM

TOO

COOL

ECONO COOL

POWERFUL COOL

SELECT

FAN

VANE

TIME

MODE

I FEEL

COOL

DRY

FAN

Signal transmitting section

Operation display section

TEMPERATURE buttons

VANE CONTROL button

TIME SET button

RESET button

ECONO COOL button

POWERFUL COOL button

OPERATION SELECT button

TIMER MODE SELECT button

OPERATE/STOP (ON/OFF) button

FAN SPEED CONTROL button

Indication of remote controller

model is on back.

These buttons are able to store the light

from nature, fluorescent lamp, etc and

shine in the dark.

Indoor model

MS-GD08ND-

MS-GD10ND-

MS-GD12ND-

Function Cooling

Power supply Single phase 220-230V, 60Hz

Capacity Air flow (High/Med/Low) K/h 588/456/372 630/498/336 666/498/336

Electrical data

Power outlet A 10

Running current A 0.19

Power input W 40

Auxiliary heater A (kW) —

Power factor % 96-92

Fan motor current A 0.19

Fan

motor

Model RC4N19-BA

Winding

resistance (at 20ºC) " WHT-BLK 312

BLK-RED 255

Dimensions WoHoD mm 815o278o244

Weight kg 9 10

Special

remarks

Air direction 5

Sound level (High/Med/Low) dB 39/32/26 39/32/26 42/36/29

Fan speed (High/Med/Low) rpm 1030/800/650 960/800/650 1000/800/650

Fan speed regulator 3

Thermistor RT11 (at 25ºC) kΩ 10

Thermistor RT12 (at 25ºC) kΩ 10

Remote controller model MP2B

NOTE: Test conditions are based on CNS 14464

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

Outdoor Dry-bulb temperature 35°C Wet-bulb temperature 24°C

Refrigerant piping length (one way) 7.5 m

MS-GD08ND- C1

MS-GD10ND- C1

MS-GD12ND- C1

[9.52-0.43m

244

242 5

erom ro

110

149

606

815

783

Air out

Installation plate

Insulation [28

Drain hose [16

(Connected part O.D)

Liquid line [6.35-0.5m

Gas line [9.52-0.43m

Insulation [37 O.D

[21 I.D

{

Wireless remote controller

81.5

172

5.132

81.5 133.5

326326

Wall hole [65

Indoor unit

Installation plate

17.5

Air in

244

242

5.812

81.581.5

5.2

5.71

161.5161.5

326326

erom ro 7

110

149

606

872

815

783

Air out

Indoor unit

Installation plate

Wall hole [65

Installation plate

Insulation [28

Drain hose [16

(Connected part O.D)

Air in

Liquid line [6.35-0.5m

Gas line

Insulation[37 O.D

[21 I.D

{

Wireless remote controller

041

17.5

Unit : mm

INDOOR UNIT

OUTLINES AND DIMENSIONS4

MS-GD08ND- C1

INDOOR UNIT

MS-GD10ND- C1

MS-GD12ND- C1

MS-GD08ND- C1

MS-GD12ND- C1

WIRING DIAGRAM

INDOOR UNIT

MS-GD10ND- C1

REFRIGERANT SYSTEM DIAGRAM

MS-GD08ND- C1

MS-GD10ND- C1

INDOOR UNIT

Room

temperature

thermistor

Indoor

heat

exchanger

RT11

Indoor coil

thermistor

RT12

Refrigerant pipe

(Option){6.35

(with heat insulator)

Flared

connection

Flared

connection

Refrigerant pipe

(Option){12.7

(with heat insulator)

Refrigerant flow in cooling

Room

temperature

thermistor

Indoor

heat

exchanger

RT11

Indoor coil

thermistor

RT12

Refrigerant pipe

(Option){6.35

(with heat insulator)

Flared

connection

Flared

connection

Refrigerant pipe

(Option){9.52

(with heat insulator)

MS-GD12ND- C1

INDOOR UNIT

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 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.

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.

7-1. 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 8-6.)

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.

How to modify the remote controller P.C. board

Remove batteries before modification.

The board has a print as shown below :

NOTE : For remodelling, take out the bat-

teries and push the OPERATE/

STOP(ON/OFF)button twice or 3

times at first.

After finish remodelling, put back

the batteries then press the

RESET button.

Remote controller model : MP2B

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.

SERVICE FUNCTIONS

MS-GD08ND- C1

MS-GD10ND- C1

MS-GD12ND- C1

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

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

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

decided by the initial room temperature.

How to release “AUTO RESTART FUNCTION”

1 Turn off the main power for the unit.

2 Pull out the indoor electronic control P.C. board and the power monitor, receiver

P.C. board. (Refer to 9-1.)

3 Solder the Jumper wire to the JR07 on the indoor electronic control P.C.board.

(Refer to 8-6.)

7-3. AUTO RESTART FUNCTION

NOTE:

• The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote

controller.

• If the 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.

Operation

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

2 After the power is restored, the unit automatically resumes the same operation

as the memory has recorded.

However, it takes the compressor at least 3 minutes to get started.

JR07

IC101

CN151

SW1

CN112

CN111

CN201

52C/X10

C11

CN211

CN1V1

CN1R1 CN121

8-1. 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 main 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.

Lead wiring

Housing point

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 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 8-2. and 8-3.

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.

Press the RESET button with tip end of ball point

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

NOTE : 1. If the RESET button is not pressed, the remote controller may not operate correctly.

2. This remote controller has a circuit to automatically reset the microcomputer when batteries are replaced.

This function is equipped to prevent the microcomputer from malfunctioning due to the voltage drop caused by

the battery replacement.

1 Remove the back lid and insert batteries.

Then reattach the back lid.

Insert the negative pole

of the batteries first.

Check if the polarity of

the batteries are correct.

RESET button

TROUBLESHOOTING8

MS-GD08ND- C1

MS-GD10ND- C1

MS-GD12ND- C1

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