Service Functions - Mitsubishi Electric MS-18NN Series Service Manual

9

SERVICE FUNCTIONS

9-1. 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.
3-minute time delay : 3-minute
AUTO START : 1 hour
AUTO STOP : 1 hour
9-2. 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 indoor unit number.
(1) How to modify the remote controller P.C. board
Remove batteries before modification.
The board has a print as shown below;
NOTE : Fore remodeling, take out the batteries at first.
After finish remodeling, 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
NOTE : At power supply failure or installation, indoor unit deletes the memory about remote controller. When
the power supply is turned on and indoor unit receives the first signals from the remote controller, the
remote controller number is designated as the indoor unit number. Therefore at and after the second
time indoor unit accepts the remote controller of the initial setting number.
At setting - error, turn the power supply off to cancel the individual operation and then turn the power
supply on to restart the setting.
3-second.
1-minute
}
Short the connector during the timer mode.
1-minute
1 unit operation
No modification
2 unit operation
Same as at left
Cut J1
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
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