Mitsubishi PKH-1.6GKLH Technical & Service Manual page 54

NOTE1 : Install the relay box where you can be serviced it easily.
NOTE2 : For control circuit wiring, use a wire of No. 1 AWG or a control cable according to the power supply of control
circuit.
NOTE : When the power supply of the control circuit is 220/20V 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.
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
SW1
(Switches between
remote ON and OFF.)
w1 After all units start together, if SW2 is turned OFF, each unit can be individually stopped by each remote controller.
w2 After 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 central-
ized monitoring of units installed in different places without a special
control board.
Remote control cables are extendible up to 00m. When the cable
length exceeds 12m, use the double-insulated two-care cable such
as Belden 907. 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.
OC229A
Remote
ON/OFF
switch
Power
SW
supply
SW
(Switches between remote ON-OFF and individual control)
(Remote ON-OFF control)
ON All units start together.
(Start) Individual control is not available.
OFF All units stop together.
(Stop) Individual control is not available.
No.1 unit No.2 unit
relay box relay box
1
2
T
X
2
T
To To
No.1 No.2
X
2
unit unit
Remote controller
Timer adapter cables
SW2
ON
w1
w2
Remote
controller cable (2-core)
Remote controller

Next unit
T
X
2
T
X
2
OFF
(Individual control)
Each unit can be controlled by each
remote controller.
Remote ON-OFF switch is not available.