13
SERVICE FUNCTIONS
8
8-1. TIMER SHORT MODE
For service, the following set time can be shortened by bridging the timer short mode point on the electronic control P.C.
board. (Refer to 10-7.2.)
• The set time for the ON/OFF timer can be reduced to 1 second for each minute.
• After the breaker is turned on, the time for starting the compressor, which normally takes 3 minutes, can be reduced to
1 minute. Restarting the compressor, which takes 3 minutes, cannot be reduced.
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:
NOTE:
For modification, take out the
batteries and press the STOP/
OPERATE (OFF/ON) button 2
or 3 times at first.
After modification, put back the
batteries then press the RESET
button.
MSXY-FN07VE MSXY-FN10VE MSXY-FN13VE
MSXY-FN18VE MSXY-FN20VE MSXY-FN24VE
J2
J1
Table 1
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 SJ1/J1
Same as at left
Same as at left
No. 3 unit
—
—
Solder SJ2/J2
Same as at left
No. 4 unit
—
—
—
Solder both SJ1/J1 and SJ2/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 is turned OFF, or the power supply is shut down.
Please conduct the above setting once again after the power has been restored.
SJ2
SJ1
MSY-FN07/10/13/18/20/24VE-
R2
: KH18A (SJ1, SJ2)
MSY-FN07/10/13/18/20/24VE-
R1
: KM15D (J1, J2)
The P.C. board has the print “SJ1/J1” and “SJ2/J2”. Solder “SJ1/J1” and “SJ2/J2” according to the number of indoor unit as
shown in Table 1.
After modification, press the RESET button.
OBH779C
