7 
SERVICE FUNCTIONS
MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSZ-A24NA
MSY-A15NA MSY-A17NA MSY-A24NA
7-1. TIMER SHORT MODE
For service, set time can be shortened by short circuit of JPG and JPS the indoor electronic control P.C. board. The time will be shortened as follows. (Refer to
Set time : 
Set time : 
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 twice or 3 |
| times at first. |
| After finish modification, |
J1 J2 | put back the batteries then |
press the RESET button. |
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 | 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 J1 | Same as at left | Same as at left |
No. 3 unit | — | — | Solder J2 | Same as at left |
No. 4 unit | — | — | — | Solder both J1 and 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 has turned off, or the power supply has shut down. Please conduct the above setting once again after the power has restored.
10
