Auto Restart Function - Mitsubishi Electric MSH09TW Service Manual

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 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.

11-5. AUTO RESTART FUNCTION

When the indoor unit is operated with the remote controller, the signals of the operation mode, the set temperature,
and the fan speed are sent from the indoor electronic control P.C. board and memorized in the auto restart assembly.
When the main power is turned off and then turned back on, the unit restarts automatically in the memorized set
conditions approximately after 3 minutes.
How to release "AUTO RESTART FUNCTION"
1
Turn off the main power for the unit.
2
Pull out the indoor electronic control P.C. board and the display P.C.board. (Refer to page 102 or 104.)
3
<MSH09>
Solder the Jumper wire or the Resistor 220Ω to the JR07 on the indoor electronic control P.C.board. (Refer to page 94.)
<MSH12/15/17>
Disconnect the AUTO RESTART ASSY from CN104, and solder the Jumper wire to JHA on the indoor electronic control
P.C. board.(Refer to page 95.)
Operation
1
If the main power (115V AC) has been cut, the operation settings remain.
2
After the power is restored, the unit restarts automatically according to the memory. (However, it takes at least 3 minutes
for the compressor to start running.)
MSH09
C11
CN201
IC101
NOTE:
•
The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote
controller.
•
If the main power is turned off or a power failure occurs while AUTO START/STOP timer is active the timer setting is
cancelled.
•
If the unit has been off with the remote controller before power failure, the auto restart function does not work as the
power button of the remote controller is off.
•
To prevent breaker off due to the rush of starting current, systematize other home appliances not to turn on at the same time.
•
When some air conditioners are connected to the same supply system, if they are operated before power failure, the
starting current of all the compressors may flow simultaneously at restart.
Therefore, the special counter-measures are required to prevent the main voltage-drop or the rush of the starting current
by adding system that allows the units to start one by one.
1 unit operation
No modification
–
–
–
CN211
SW1
JR07
2 units operation
Same as at left
Solder J1
–
–
MSH12/15/17
IC101
RA102
74
3 units operation
Same as at left
Same as at left
Solder J2
– Solder both J1 and J2
4 units operation
Same as at left
Same as at left
Same as at left
JHA
CN104