Service Functions - Mitsubishi Electric MSZ-A09NA Service Manual

7

SERVICE FUNCTIONS

MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSZ-A24NA MSY-A15NA
MSY-A17NA MSY-A24NA MSZ-GA24NA MSY-GA24NA
7-1. TIMER SHORT MODE
For service, set time can be shortened by short circuit of JPG and JPS on the indoor electronic control P.C. board.
The time will be shortened as follows. (Refer to 8-7.)
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
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.
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 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.
shortened by short circuit-of JPG and JPS.)
J1
1 unit operation
No modifi cation
—
—
—
J2
2 units operation
Same as at left
Solder J1
—
—
10
NOTE: For modification, take out
the batteries and press the
OPERATE/STOP (ON/OFF)
button twice or 3 times at
first.
After finish modification,
put back the batteries then
press the RESET button.
3 units operation
Same as at left
Same as at left
Solder J2
— Solder both J1 and J2
4 units operation
Same as at left
Same as at left
Same as at left