Mitsubishi MSC-GA20VB Service Manual download pdf (Page 11)

SERVICE FUNCTIONS

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. (Refer to 10-6.)

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 short-

ened 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.

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.

NOTE: For modification, take out the batteries and press the OPERATE/STOP (ON/OFF) button 2 or 3 times at first.

After modification, put back the batteries then press the RESET button.

Slide switch

Type

The position

of the slide

switch

COOL ONLYCOOL & HEAT

8-3. REMOTE CONTROLLER (How to set the type) MSC-GE

This remote controller setting needs to be switched according to the type of air conditioner (COOL & HEAT or COOL

ONLY).

If the setting is incorrect, the air conditioner does not operate normally. Therefore, check if the setting corresponds to the

type of-air conditioner. If not, correct the setting as shown below.

MSC-GE20VB MS-GE50VB

MSC-GE25VB MSH-GE50VB

MSC-GE35VB

OBH529A

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 35 36

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Mitsubishi MSC-GA20VB Service Manual Page 11

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