Electrical Wiring; Standard Electrical Connection; Electrical Connection For Multiple Units - Hitachi PC-ARF Technical Catalogue

4 Individual remote controls
PC-ART

4.2.3 Electrical wiring

4.2.3.1 Standard electrical connection

C A U T I O N
For operational and safety purposes, fit the ring core "attachment" when installing the unit.
• Wind the remote control cable around the ring core twice, as shown
beside, before connecting it to the indoor unit terminal board.
• If the cable measures 0.75 mm2 or more, the outer insulation must
be stripped (only on the part to be wound), otherwise you will not be
able to wind the cable around the ring core.
• Secure the cable using the cable tie (accessory).
This diagram shows an example of a standard connection, with the ca-
ble connected to terminals A and B.

4.2.3.2 Electrical connection for multiple units


Wiring example (Using a twist pair cable with shield tube)
This remote control switch can control sixteen units, as the maximum.
PC-ART (Main)
M3
screws
C A U T I O N
Always make sure to turn off the power of the indoor unit when performing electrical wiring work. Performing electrical wiring work with the
power on can damage the circuit boards of the indoor unit and the remote control switch.
N O T E
• Use a 0.3 to 0.75 mm cable for connecting. The maximum total cable length is 30 m. If the total cable length exceeds 30m, use a
2
twist pair cable with shield tube (1P - 0.75 mm
the control timer, the allowable total cable length is up to 100 m. The use of a cable other than that specified above can cause of
malfunction due to effects of noise.
• Keep a distance more than 30 cm between the transmission line (remote control switch cable and transmission wires) and power
source of the indoor units. If not, the air-conditioner may not operate properly or malfunction may occur due to effect of power source
noise.
• In case of simultaneously controlling multiple indoor units, set the refrigerant cycle numbers and addresses of the indoor units without
overlapping.
• Refer to the Technical Catalogue provided with each indoor unit when performing electrical wiring work between the remote control
switch and indoor units for setting the refrigerant cycle number and the indoor unit address.
• No gap shall exist between the remote control switch cable and hole of the remote control switch case. If there is a gap, cover the gap
with vinyl tape. If not, malfunction may occur due to entrance of water droplets or insects.
• In case of operating with two remote control switches (Main and Sub), set the main and sub remote control switches by selecting the
appropriate function with the remote control switches according to the chapter Function selection and setting. After setting it, turn off
the power supply of all the indoor unit connected to the remote control switches.
121
TCGB0106 rev.0 - 12/2014
Max. 16 indoor units
M3.5
M3.5
screws
screw
Twist Pair cable:
1 P - bigger than 0.75 mm
2
). In that case, the maximum total cable length is 500 m. If using in combination with
2
PC-ART (Sub)
4