Mitsubishi Electric MSZ-HJ50VA Service Manual download pdf (Page 9)

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, the following set time can be shortened by short circuiting the timer short mode point on the electronic control

P.C. board. (Refer to 10-7.)

Set time : 3-minute → 3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is

shortened by short circuiting the timer short mode point.)

Table 1

1 unit operation 2 units operation 3 units operation 4 units operation

No. 1 unit No modiﬁ cation 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

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 modification, take out

the batteries and press

the OPERATE/STOP (ON/

OFF) button 2 or 3 times at

first.

After finish modification,

put back the batteries then

press the RESET button.

MSZ-HJ25VA MSZ-HJ35VA MSZ-HJ50VA

SERVICE FUNCTIONS

OBH647A

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Mitsubishi Electric MSZ-HJ50VA Service Manual Page 9