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

4 Individual remote controls
PC-ARH

4.3.3 Electrical wiring

4.3.3.1 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.

4.3.3.2 Electrical connection for multiple units

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Wiring example (Using a twist pair cable with shield tube)
This remote control can control up to a maximum of
16 units. If this setting is changed, the wiring connec-
tion and other necessary tasks must be carried out,
as shown below.
Two remote controls can be connected to the same
unit or group of units. The second is a secondary re-
mote control, as shown below. See "Optional func-
tions" for more information.
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 - 0.75 mm2 cable (maximum total cable length: 30 m). If the total cable length exceeds 30m, use a twisted pair cable (1P -
0.75 mm2) (maximum total cable length: 200 m). If using the remote control timer, the maximum total cable length is 100m. The use
of other cables can produce noise, which may lead to a defective system operation.
• The remote control cable/indoor unit transmission cables and the power supply cable must be kept at least 30cm apart.
• If this distance is less than 30 cm, install the cables in a conduit (type-D; ≤ 100 Ω) and connect one end to earth. Failure to do so may
cause a fault or may cause the air conditioning unit to work incorrectly due to the noise.
• If several indoor units are controlled simultaneously, establish the addresses for the refrigerant cycle and indoor units. This is particu-
larly important when simultaneously controlling indoor units with several refrigerant cycles since abnormal transmission may occur
due to duplicate addresses.
• Do not leave any space in the remote control box cable hole. Any space must be covered using vinyl tape for example to prevent
problems caused by dew or by insects entering the remote control box.
• To use two remote controls (primary and secondary), see Optional Functions.
164
TCGB0106 rev.0 - 12/2014
Wiring
remote
control
Max. 16 indoor units
Terminal board Terminal board
Screws M3.5
Twisted pair cable:
1P - at least 0.75 mm²
Cable tie
Ring core
Screws M3.5