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8. Electrical Work
8-1. Caution
(1) Follow local regulations and ordinances for technical standards re-
lated to electrical equipment, wiring, and specifications of each elec-
tric 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 trans-
mission 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 transmis-
sion 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 13.)
(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.
8-2. Connecting the R-Converter unit, indoor unit and outdoor unit transmission ca-
bles
•
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 specifica-
tions, 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
2 "Outdoor unit – R-Converter unit" + "R-Converter unit – R-Converter unit"
Maximum transmission cable length : (L
8-3. Wiring of main power supply and equipment capacity
Overcurrent device 15 A
Thickness of wire for main power supply and on/off capacities
Minimum wire thickness (mm
Model
Main cable
Branch
R-Converter unit
1.5
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
10
and r
,r
10 m (2-Core 1.0 mm
1
2
3
+L
) or (L
+L
+L
) or (L
1
2
1
3
4
Switch 15 A
R-Converter unit
Total operational current is less than 15 A
2
)
Breaker for
Ground
wiring (NFB)
1.5
1.5
15 A
2
.
Outdoor unit
(51)
TB3
M1 M2 S
L
1
L
2
)
+L
+L
)
200 m
2
3
4
Pull box
Breaker for current leakage
15 A
R-Converter unit
R-Converter unit
(01)
TB5
TB3
TB5
M1 M2 S
3 N
M1 M2 S
L
2
3
2 N
TB
3
Indoor unit
CITY MULTI indoor unit
R-Converter unit
(03)
TB5
TB3
M1 M2
S
3 N
L
4
3
2 N
TB
Indoor unit
R-Converter unit
TB3
3
N
3
N
Indoor unit
(02)
TB3
3 N
3
2 N
TB
Indoor unit
(04)
M1 M2 S
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