Mitsubishi Electric PL12AK User Manual page 48

NOTE1 : Install the relay box where you can be serviced it easily.
NOTE2 : For control circuit wiring, use a wire of No. 14 AWG or a control cable according to the power supply of control
circuit.
NOTE3 : When the power supply of the control circuit is 115V AC,
Do not connect the control circuit wire to the remote controller cable directly.
Do not place the control circuit wire and the remote controller cable into the same conduit tube.
4-2 Basic wiring
Caution : Before starting all units simultaneously by the remote ON-OFF switch, be sure to connect a sequence-start timer
into the remote ON-OFF circuit. Otherwise, a rush of starting current may damage the power supply.
Power
supply
Glow switch or pilot lamp can be
combined to easily identify the
on-off mode of SW1 and SW2.
4-3 Switch function of remote ON-OFF switch
ON
SW1
(Start)
(Switches between
OFF
remote ON and OFF.)
(Stop)
w1After all units start together, if SW2 is turned OFF, each unit can be individually stopped by each remote controller.
w2After all units stop together, if SW2 is turned OFF, each unit can be individually started by each remote controller.
5. INDIVIDUAL CONTROL BY GROUPING THE
REMOTE CONTROLLERS
Grouping the remote controllers allows individual control and cen-
tralized monitoring of units installed in different places without a
special control board.
Remote control cables are extendible up to 550 yards When the
cable length exceeds 33ft, use the double-insulated two-care cable
such as Belden 9407. Also, the cable thickness must be No. 22
AWG or above.
When gathering the power ON/OFF switches of air conditioners
near the remote controllers, you should also install the power
ON/OFF switch near each unit to prevent electric trouble during
servicing.
Remote
No.1 unit
ON/OFF
relay box
switch
SW
1
SW
2
To
No.1
unit
(Switches between remote ON-OFF and individual control)
(Remote ON-OFF control)
All units start together.
Individual control is not available.
All units stop together.
Individual control is not available.
No.2 unit
relay box
T T
X X
2 2
T T
To
No.2
X X
2 2
unit
Remote controller
Timer adapter cables
SW2
ON
w1
Each unit can be controlled by each
remote controller.
w2
Remote ON-OFF switch is not available.
Remote
controller cable (2-core)
Remote controller
OC246-48
Next unit
OFF
(Individual control)