Mitsubishi Electric PKH18FK1 Technical & Service Manual page 56

NOTE1 : Install the relay box where you can be serviced 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 208/230V 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, rush of starting current exert a bad influence upon 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
SW1
(Start)
(Switches between
remote ON and OFF.)
(Stop)
*1 After all units start together, if SW2 is turned OFF, each unit can be individually stopped by each remote controller.
*2 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 cen-
tralized monitoring of units installed in different places without a
special control board.
Remote control cables can be extended up to 550 yards. When the
cable length exceeds 39 ft, use the double-insulated two-core
cable such as Belden 9407, and 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 in servic-
ing.
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)
ON All units start together.
Individual control is not available.
OFF 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
*1
*2
Remote
controller cable (2-core)
Remote controller
OC193-54
Next unit
OFF
(Individual control)
Each unit can be controlled by each
remote controller.
Remote ON-OFF switch is not available.