Service Functions; Change In Defrost Setting; Timer Short Mode; P.c. Board Modification For Individual Operation - Mitsubishi Electric Mr.Slim MSZ09UN Service Manual

9

SERVICE FUNCTIONS

MSZ09UN MUZ09UN
MSZ12UN MUZ12UN

9-1. CHANGE IN DEFROST SETTING

<JS> When the JS wire of the outdoor electronic control P.C. board is cut, the defrost temperature will be changed.
Jumper wire
JS

9-2. TIMER SHORT MODE

For service, set time can be shortened by short circuit of JPG and JPS the indoor electronic control P.C. board.
The time will be shortened as follows. (Refer to page 56 or 57.)
Set time : 1 minute
Set time : 3 minute
shortened by short circuit of JPG and JPS.)

9-3. 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 indoor unit number.
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.
Table 1
No. 1 unit
No. 2 unit
No. 3 unit
No. 4 unit
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.
Deforst finish temperature changes from 55°F to 59°F.
1-second
3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is
1 unit operation 2 units operation
No modification
–
–
–
Change point
3 units operation
Same as at left
Solder J1
–
–
39
(Refer to page 58.)
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.
4 units operation
Same as at left
Same as at left
Solder J2
Solder both J1 and J2
–
Same as at left
Same as at left
Same as at left