Mitsubishi Electric MSC-GA20VB- E1 Service Manual page 10

8-4. MU & MUX TYPE / MUH & MXZ TYPE SWITCH OVER AND AUTO RESTART FUNCTION
1. MU & MUX TYPE / MUH & MXZ TYPE SWITCH OVER
The indoor units for MU & MUX type and MUH & MXZ type
are common specifications. Set switch according to the
type of outdoor unit. The units are set for
MUH & MXZ type when they are shipped from the factory.
How to switch over MU & MUX TYPE / MUH & MXZ TYPE
!
Turn off the main power for the unit.
@
Pull out the electronic control P.C. board, and change
switch(SW2-2) on the indoor electronic control P.C. board
according to the type of outdoor unit as following figures.
Outdoor unit
MU & MUX type
Set 2 switch upside.
SW2
1 2
1 2
2. AUTO RESTART FUNCTION
When the indoor unit is controlled with the remote controller, the operation mode, set temperature, and the fan speed
are memorized by the indoor electronic control P.C.board. The "AUTO RESTART FUNCTION" sets to work the moment
power has restored after power failure.Then, the unit will restart automatically. However if the unit is operated in "I
FEEL CONTROL" mode before power failure, the operation is not memorized. In "I FEEL CONTROL" mode, the opera-
tion is decided by the initial room temperature. "AUTO RESTART FUNCTION" is ON when the units are shipped from
the factory.
Operation
!
If the main power (230V AC) has been cut, the operation settings remain.
@
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.)
How to release "AUTO RESTART FUNCTION"
!
Turn off the main power for the unit.
@
Pull out the electronic control P.C. board, and change switch(SW2-1) on the indoor electronic control P.C. board as
following figures.
NOTE
•
The operation settings are memorized when 10 seconds have passed after the remote controller was operated.
•
If main power is cut 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 appliance 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.
Outdoor unit
MUH & MXZ type
Set 2 switch downside.
SW2
1 2
1 2
AUTO RESTART
FUNCTION ON
Set 1 switch downside.
SW2
1 2
1 2
SW2-1 sets the AUTO RESTART FUNCTION ON / OFF.
SW2-2 switches over the MU & MUX type / MUH & MXZ type.
When the units are shipped from the factory, SW2 is as follows.
SW2-1: AUTO RESTART FUNCTION ON
SW2-2: MUH & MXZ type
F11
L101
LD105
CN202
IC101
NOTE:•
If the indoor-outdoor connecting wire is incorrectly
connected on the terminal block, the unit does not
operate normally.
•
If a ground is incorrect, it may cause an electric shock.
AUTO RESTART
FUNCTION OFF
Set 1 switch upside.
SW2
1 2
1 2
10
}
FRONT
SW2
SW1