Service Functions - Mitsubishi Electric MSZ-HJ25VA-E1 Service Manual

8

SERVICE FUNCTIONS

MSZ-HJ25VA MSZ-HJ35VA MSZ-HJ50VA
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
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 :
J1
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
1 unit operation
No. 1 unit No modifi cation
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.
OBH647A
shortened by short circuiting the timer short mode point.)
J2
2 units operation
Same as at left
– Solder J1
–
–
3 units operation
Same as at left
Same as at left
– Solder J2
–
9
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.
4 units operation
Same as at left
Same as at left
Same as at left
– Solder both J1 and J2