Service manual
19
7 ELECTRICAL WORK
7-1. Caution
(1) Follow local regulations and ordinances for technical
standards related to electrical equipment, wiring, and
specifications of each electric power company.
(2) Wiring for control (hereinafter referred to as transmission
line) must be situated at least 5 cm from the power source
wiring so that it is not influenced by electrical noise. (Do not
insert transmission line and power source wire in the same
conduit.)
(3) Be sure to provide designated grounded work to outdoor
unit.
(4) Never connect the main power source to the terminal block
of a transmission line. If connected, electrical parts will be
burnt out.
(5) Use a 2-core shield cable for connecting a transmission line
to TB5 of the R-Converter unit. If transmission of different
systems are wired with the same multiplecore cable, which
can result in poor transmission and receipt and can cause
incorrect operation.
(6) The system will not operate if connected improperly.
TB2 : Terminal block for power supply
TB3 : Terminal block for transmission line to indoor unit
TB5 : Terminal block for transmission line to outdoor unit
(7) Before turning the indoor unit and the R-Converter unit
on, be sure to set the switches. (See page 14).
(8) To turn the power on, turn on the indoor unit,
R-Converter unit, then the outdoor unit, in that order.
(9) For identification purposes, list the indoor unit model names
in the nameplate on the control box of the R-Converter unit.
7-2. Connecting the R-Converter unit, indoor unit and outdoor unit transmission cables
• Connect the outdoor unit (TB3) to the R-Converter unit (TB5). (Non-polarized 2-wire) The "S" terminal on the R-Converter unit
(TB5) is a shielding wire connection. For connecting cable specifications, refer to the outdoor unit installation manual.
• Connect the indoor unit (TB) to the R-Converter unit (TB3). For connecting cable specifications, refer to the indoor unit
installation manual.
Permissible Length
1 "Indoor unit - R-Converter unit"
Maximum transmission cable length : r
1
and r
2
, r
3
[ 10 m (2-Core 1.0 mm
2
)
2 "Outdoor unit - R-Converter unit" + "R-Converter unit - R-Converter unit"
Maximum transmission cable length : (L
1
+ L
2
) or (L
1
- L
3
+ L
4
) or (L
2
+ L
3
+ L
4
) [ 200 m
7-3. Wiring of main power supply and equipment capacity
1. Use separate power supplies for the outdoor unit and R-Converter unit.
2. Consider the ambient conditions (ambient temperature, direct sunlight, rain, etc.) when wiring and making connections.
3. The wire size is the minimum value for metal conduit wiring. The power cord size must be 1 rank thinker in consideration of
voltage drops.
Make sure that the power supply voltage does not drop more than 10%.
4. Select non-fuse breaker (NFB) or earth leakage breaker (NV).
(A means for the disconnection of the supply with an isolation switch, or similar device, in all active conductors shall be
incorporated in the fixed wiring.)
5. Power supply codes of appliance must not be lighter than design 245 IEC 53 or 227 IEC 53.
6. A switch with at least a 3 mm contact separation in each pole must be provided by the air conditioner installation.
Power cable size : more than 1.5 mm
2
.
Model
Minimum wire thickness (mm
2
)
Breaker for wiring (NFB)
15A
Breaker for current leakage
15A
Branch GroundMain cable
1.5 1.51.5R-Converter unit
Thickness of wire for main power supply and on/off capacities
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