13
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10. Electrical wiring
Precautions on electrical wiring
Warning:
Electrical work should be done by qualified electrical engineers in
accordance with “Engineering Standards For Electrical Installation” and
supplied installation manuals. Special circuits should also be used. If the
power circuit lacks capacity or has an installation failure, it may cause a
risk of electric shock or
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3. Install the unit to prevent that any of the control circuit cables (remote con-
troller, transmission cables, or external input/output line) is brought in direct
contact with the power cable outside the unit.
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5. Some cables (power, remote controller, transmission cables, or external
input/output line) above the ceiling may be bitten by mouses. Use as many
metal pipes as possible to insert the cables into them for protection.
6. Never connect the power cable to leads for the transmission cables. Other-
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7. Be sure to connect control cables to the indoor unit, remote controller, and
the outdoor unit.
8. Be sure to ground the unit.
9. Select control cables from the conditions given in page
13
.
Caution:
Be sure to put the unit to the ground on the outdoor unit side. Do not connect
the earth cable to any gas pipe, water pipe, lightening rod, or telephone earth
cable. Incomplete grounding may cause a risk of electric shock.
Types of control cables
1. Wiring transmission cables
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Design wiring in accordance with the following table <Table 1. Transmission
cables>.
10.1. Power supply wiring
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ELECTRICAL WOR
.
1. Electrical characteristics
Model
Power supply
Compressor
RLA (A)*1
Hz
Volts
Voltage range
MCA (A)
2XWSXWN:
SC (A)
Heating
PWFY-P36NMU-E-BU
60
208-230
Max. 253 V
Min. 187 V
25
1.0
1.25
12.30-11.12
Model
Power supply
RLA (A)*1
Hz
Volts
Voltage range
Heating
PWFY-P36NMU-E2-AU
PWFY-P72NMU-E2-AU
60
208-230
Max. 253 V
Min. 187 V
0.145-0.150
*1: unit data
2. Power cable speci
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cations
Model
0LQLPXPZLUHWKLFNQHVVPP
2
) [AWG]
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FXUUHQWOHDNDJH
Local swich (A)
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Main cable
branch
Ground
capacity
fuse
PWFY-P36NMU-E-BU
2.5 [12]
-
2.5 [12]
15.71
25
25
25
Model
0LQLPXPZLUHWKLFNQHVVPP
2
) [AWG]
%UHDNHUIRU
FXUUHQWOHDNDJH
Local swich (A)
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Main cable
branch
Ground
capacity
fuse
PWFY-P36NMU-E2-AU
PWFY-P72NMU-E2-AU
Total
operating
current
16 A or less
1.5 [14]
1.5 [14]
1.5 [14]
20 A 30 mA 0.1 sec. or less
16
16
20
25 A or less
2.5 [12]
2.5 [12]
2.5 [12]
30 A 30 mA 0.2 sec. or less
25
25
25
32 A or less
4.0 [8]
4.0 [8]
4.0 [8]
40 A 30 mA 0.3 sec. or less
30
30
40
1. Transmission
cables
PWFY-P36NMU-E-BU
Transmission cables
MA Remote controller cables
External input
External output
Type of cable
Shielding wire (2-core)
CVVS, CPEVS or MVVS
Sheathed 2-core cable (shielded)
CVVS
Sheathed multi-core cable (shielded)
CVVS or MVVS
Sheathed multi-core cable (unshielded)
CVV or MVV
Cable diameter
More than 1.25 mm
2
0.3
a
1.25 mm
2
(0.75
a
1.25 mm
2
)
0.3
a
0.5 mm
2
0.3
a
1.25 mm
2
AWG No
AWG 16
AWG 18 to 16
AWG 22 to 20
AWG 22 to 16
5HPDUNV
-
Max. length : 200 m [656 ft]
Max. length : 100 m [328 ft]
Rated voltage : L1-N : 208/230 V
Rated load : 0.6 A
PWFY-P36/P72NMU-E2-AU
Transmission cables
MA Remote controller cables
External input
External output
Type of cable
Shielding wire (2-core)
CVVS, CPEVS or MVVS
Sheathed 2-core cable (shielded)
CVVS
Sheathed multi-core cable (shielded)
CVV or MVV
Sheathed multi-core cable (unshielded)
CVV or MVV
Cable diameter
More than 1.25 mm
2
0.3
a
1.25 mm
2
(0.75
a
1.25 mm
2
)
0.3
a
0.5 mm
2
0.3
a
1.25 mm
2
AWG No
AWG 16
AWG 18 to 16
AWG 22 to 20
AWG 22 to 16
5HPDUNV
-
Max. length : 200 m [656 ft]
Max. length : 100 m [328 ft]
Rated voltage : L1-N : 208/230 V
Rated load : 0.6 A
[Fig. 10.1.1] (P. 6)
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Ⓒ
PWFY-P36NMU-E-BU
Ⓓ
PWFY-P36/P72NMU-E2-AU
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Pull
box
Caution:
Do not use anything other than the correct capacity breaker and fuse.
Using fuse, wire or copper wire with too large capacity may cause a risk of
malfunction or
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