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4. ELECTRICAL WIRING
4-1. General Precautions on Wiring
(1) Before wiring, confirm the rated voltage of the unit
as shown on its nameplate, then carry out the
wiring closely following the wiring diagram.
(2) Provide a power outlet to be used exclusively for
each unit, and a power supply disconnect and cir-
cuit breaker for overcurrent protection should be
provided in the exclusive line.
(3) To prevent possible hazards from insulation fail-
ure, the unit must be grounded.
(4) Each wiring connection must be done in accor-
dance with the wiring system diagram. Wrong
wiring may cause the unit to misoperate or
become damaged.
(5) Do not allow wiring to touch the refrigerant tubing,
compressor, or any moving parts of the fan.
(6) Unauthorized changes in the internal wiring can be
very dangerous. The manufacturer will accept no
responsibility for any damage or misoperation that
occurs as a result of such unauthorized changes.
4-2. Recommended Wire Length and Wire Diameter for Power Supply System
Outdoor unit
GRFMI605R7IA-
GRFMI705R7IA-
GRFMI905R7IA-
GRFMI1155R7IA-
GRFM705R7TA-
GRFM905R7TA-
GRFM1155R7TA-
Indoor unit
(B) Power supply
Time delay fuse or
circuit capacity
2
2.5 mm
Max. 130 m
Control wiring
(C) Inter-unit (between outdoor and
indoor units) control wiring
2
0.75 mm
(AWG #18)
Use shielded wiring*
Max. 1,000 m
NOTE
* With ring-type wire terminal.
(A) Power supply
Wire size Max. length
4 mm
113 m
2
6 mm
2
74 m
6 mm
2
60 m
6 mm
2
55 m
6 mm
2
47 m
6 mm
46 m
2
6 mm
2
39 m
10 ~ 16A
(D) Remote control wiring
0.75 mm
Use shielded wiring
(7) Regulations on wire diameters differ from locality
to locality. For field wiring rules, please refer to
your LOCAL ELECTRICAL CODES before begin-
ning.
You must ensure that installation complies with all
relevant rules and regulations.
(8) To prevent malfunction of the air conditioner
caused by electrical noise, care must be taken
when wiring as follows:
G
The remote control wiring and the inter-unit control
wiring should be wired apart from the inter-unit
power wiring.
G
Use shielded wires for inter-unit control wiring
between units and ground the shield on both sides.
(9) If the power supply cord of this appliance is dam-
aged, it must be replaced by a repair shop
appointed by the manufacture, because special
purpose tools are required.
Time delay fuse or
circuit capacity
15 A
30 A
or
35 A
40 A
35 A
40 A
50 A
2
(AWG #18)
Max. 500 m
8
(A) Power supply
Wire size Max. length
2.5 mm
2
70 m
6 mm
2
74 m
6 mm
2
60 m
2
10 mm
91 m
6 mm
2
47 m
10 mm
2
77 m
10 mm
2
65 m
(E) Control wiring for group control
2
0.75 mm
(AWG #18)
Use shielded wiring
Max. 500 m (Total)
(F) Inter-outdoor unit control wiring
2
0.75 mm
(AWG #18)
Use shielded wiring
Max. 500 m
Time delay fuse or
circuit capacity
16A
35A
35A
50A
35A
50A
50A
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