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Si33-102.book Page 52 Tuesday, June 26, 2001 3:18 PM
Installation
b) When cable more than 1.25 mm
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
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 53)
Power Supply 1. Choosing a circuit breaker
(Cabling of Main
The power supply work must conform to local regulations. In Japan, the relevant regulations are the MITI
Power Supply) ordinance determining technical standards for electrical equipment, and the Internal Wining Provisions.
a) The indoor unit circuit breakers
In accordance with the provisions for internal wiring (JEAC8001-1986), power may be supplied by
means of crossover lines between the indoor units in a single system branch circuit.
Branch circuit facility (Internal wiring provisions
305-2)
The motors must be set up with a dedicated branch
circuit for each unit. However, where they
correspond to any of the following situations, this
limitation does not apply.
When used in a 15A branch circuit of a 20A
circuit breaker branch circuit
Note: It is recommended that the total rated
capacity of the motors set up in a 15A branch circuit
or a 20A circuit breaker branch circuit should be no
more than 2.2kW.
52
² is used
.
²

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SiE33-102
General Information