Hitachi PC-ART Installation Manual page 9

3. ELECTRICAL WIRING
3.1. STANDARD WIRING

ATTENTION:
 Attach the ring core (black) (accessory) when
installing the unit.
 Insert the controller cable into the ring core
2 turns as shown in the right fi gure before
connecting to the terminal board.
 If wiring is 0.75mm 2 is necessary to peel
the outside cover.
 Fix the cable by using the band (accessory).
3.2. ELECTRICAL WIRING FOR MULTIPLE UNITS
This remote control switch can control sixteen units, as the maximum.


ATTENTION
Use 0.3-0.75mm cable (max. total cable length 30m). If the total
 2
cable length is longer than 30m, use twist pair cable (1P–0.75mm
(max. total cable length 500m). When use with the control timer,
(max. total cable length 100m). Using other cables may cause
malfunction due to noise.
Keep a distance of more than 30cm between the remote control /

indoor unit transmission cables and the power wiring.
 If installed within 30cm, put the cables in a conduit tube and earth
(type-D; ≤ 100Ω) one end of the pipe. Without this procedure,
malfunction or failure of the air conditioner due to noise may occur.
 When multiple indoor units are simultaneously controlled, set
addresses for refrigerant cycle and indoor units. Especially when
the indoor units from multiple refrigerant cycle are simultaneously
controlled, transmission abnormality may occur due to address
duplication.
PC-ART (Main)
M3
screws
Twist Pair cable:
1 P - bigger than 0.75mm
INSTALLATION MANUAL
Max. 16 indoor units
M3.5
M3.5
screws
screw
2
For more information about wiring remote control switch-indoor

2 ) unit and setting indoor units addresses, see the indoor units
"INSTALLATION MANUAL".
 Do not leave any space at the cable opening of the remote
controller case. If there is any space, cover it with, e.g., vinyl
tape to avoid trouble caused by dew or insects entering into the
controller case.
 To use two remote controller (main/sub controllers), follow the
procedure in 6. "FUNCTION SELECTION" to confi gure main/sub
remote controllers. Before setting, turn OFF the power of all the
indoor units connected to the remote control switch.
Band
Ring Core
Control wiring
PC-ART (Sub)
9