SiE33-003
Installation
General Information
47
3.2.10 Electrical Work
Control Wiring
1. Compatible types of wire
Wiring Specifications
Notes:
1. Sheathed wire may be used for transmission winings, but they do not comply with EMI (Electromagnetic
lnterference) (EN55014). When using sheathed wire. EMI must conform to Japanese standards
stipulated in the Electric Appliance Regulatory Act. (If using a sheathed wire, the grounding shown in
the figure on the left is unnecessary.)
2. For FXYAP indoor unit, use sheathed wire.
2. Problems arising from the use of unsuitable cable
a) When cable less than 0.75 mm
²
is used
Where the control wiring is particularly long the transmission signals may, for example, become
unstable and the terminal relay cease to function. (Reduced voltage) The control system may become
unduly subject to noise interference.
b) When cable more than 1.25 mm
²
is used
When wiring indoor units together, the terminal block will not be able to accommodate 2 cables
simultaneously if the cables are larger than 1.25 mm
²
.
c) For multi-core cable
The greater play between wires, the more the transmitted wave is distorted and transmission
destabilized.
d) In the case of a remote control with a three way selector for cooling, heating and ventilation, twin core
cable should be used when the ventilation mode is not required and three core cable should be used
when three way selection is required.
e) Since there is a considerable risk of mixing high (220 to 240V) and low voltages in the case of, for
example, a PCB for remote control, multiple core cable must not be used.
(Internal wiring regulations and dielectric strengths of cables are relevant here.)
f) Other important points
1. The refrigerant circuit and the indoor/outdoor connecting cables must correspond exactly.
2. A suitable gap must be left between the control cables and the power supply cables where these are
laid alongside each other. (See “Separation of control and power supply cables” on page 48)
Wiring Type
Shield Wire (2 wire) (See NOTE 1, 2)
Size
0.75~1.25 mm
²
Si33-003.book Page 47 Monday, June 25, 2001 9:06 AM
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