Service Functions - Mitsubishi Electric MSZ-A09RV Service Manual

10

SERVICE FUNCTIONS

MSZ-A09RV - MUZ-A09RV -
E1
MSZ-A12RV - MUZ-A12RV -
E1
10-1. CHANGE IN DEFROST SETTING
<JP7> When the JP7 wire of the outdoor electronic control P.C. board is cut, the defrost temperature will be changed.
Jumper wire
JP7
10-2. TIMER SHORT MODE
For service, set time can be shortened by short circuit of JPG and JPS the electronic control P.C. board.
The time will be shortened as follows. (Refer to page 54.)
Set time : 1 minute
Set time : 3 minute
10-3. 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;
NOTE : Fore re-modelling, take out the batteries at first.
After finish re-modelling, put back the batteries then push the RESET-button.
The P.C. board has the print "J1" and "J2". Jumper wires are mounted to each "J1" and "J2".Cut "J1" and "J2" according to
the number of indoor unit as shown in Table 1.
After modification, push the RESET. button near the MIN-button on the remote controller.
Table1.
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.
E1
E1
Deforst finish temperature changes from 13: to 15:.
1-second
3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is
shortened by short circuit of JPG and JPS.)
1 unit operation
No modification
Change point
2 unit operation
Same as at left
Cut J1
38
(Refer to page 55.)
3 unit operation
Same as at left
Same as at left
Cut J2
Cut both J1 and J2
4 unit operation
Same as at left
Same as at left
Same as at left