Service Functions - Mitsubishi Electric MSH-A18ND Service Manual

7

SERVICE FUNCTIONS

MSH-A18ND
MSH-A24ND
7-1. TIMER SHORT MODE
For service, set time can be shortened by short circuit of JPG and JPS on the electronic control P.C. board.
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
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 :
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.
Remote controller model : KM04A
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 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.
7-3. AUTO RESTART FUNCTION
When the indoor unit is controlled with the remote controller, the operation mode, set temperature, and the fan speed are
memorized by the indoor electronic control P.C. board. "Auto restart function" automatically starts operation in the same
mode just before the shutoff of the main power. However if the unit is operated in "I FEEL CONTROL" mode before power
failure, the operation is not memorized. In "I FEEL CONTROL" mode, the operation is decided by the initial room tempera-
ture.
shortened by short circuit of JPG and JPS.)
J2
J1
1 unit operation
No modification
–
–
–
Remote controller model : KP0A
2 units operation
Same as at left
Solder J1
–
–
8
J2
3 units operation
Same as at left
Same as at left
Solder J2
– Solder both J1 and J2
J1
4 units operation
Same as at left
Same as at left
Same as at left