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DFEINLPGRRUTR
CZSVHGPO
9.1. Power supply wiring
[Indoor unit]
•Power supply cords of appliances shall not be lighter than design 245 IEC 57
or 227 IEC 57.
•A switch with at least 3 mm [1/8 in.] contact separation in each pole shall be
provided by the Air conditioner installation.
Power cable size: more than 1.5 mm
2
[AWG16]
[Fig. 9.1.1] (P.5)
A Switch 16 A B Overcurrent protection 16 A
C Indoor unit
D Total operating current be less than 16 A
E Pull box
2. Remote controller cables
Types of cables
Cable diameter
Length
MA remote controller
Sheathed 2-core cable (unshielded) CVV
0.3 to 1.25 mm
2
[AWG22 to 16]
Less than 200 m
M-NET remote controller
Sheathed 2-core cable (unshielded) CVV
0.3 to 1.25 mm
2
[AWG22 to 16]
Add any portion in excess of 10 m [32 ft] to within the longest allowable transmis-
sion cable length 200 m [656 ft] (Shielding portion is more than 1.25 mm
2
[AWG16])
<Table 1>
System configuration For a single-refrigerant system For a multi-refrigerant system
Tr ansmission cable length Less than 120 m [394 ft]
More than 120 m [394 ft]
Regardless of length
Facility example
(
for electrical noise judgment
)
Types of transmission
cables
Residence or independent store
without electrical noise
VCTF, VCTFK, CVV, CVS, VVR,
VVF, VCT or shielding wire
CVVS or CPEVS
Building, clinic, hospital or communications
station without electrical noise supposedly
generated from inverter equipment, private
power generator, high-frequency medical
equipment, radio-used communications
equipment and so on
All facilities
Shielding wire CVVS or CPEVS
Length Less than 120 m [394 ft] Less than 200 m [656 ft]
[656 ft]
9. Electrical wiring
Precautions on electrical wiring
Warning:
Electrical work should be done by qualified contractors in accordance with
“Engineering Standards For Electrical Installation” and supplied installation
manuals. Special circuits should also be used. If the power circuit lacks ca-
pacity or has an installation failure, it may cause a risk of electric shock or
fire.
1. Be sure to install a ground breaker to the power.
2. Install the unit to prevent that any of the control circuit cables (remote control-
ler, transmission cables) coming in direct contact with the power cable outside
the unit.
3. Ensure that there is no slack on all wire connections.
4. Some cables (power, remote controller, transmission cables) above the ceiling
may be bitten by rodent. Use as many metal pipes as possible to protect the
cables.
5. Never connect the power cable to leads for the transmission cables. Otherwise
the cables would be broken.
6. Be sure to connect control cables to the indoor unit, remote controller, and the
outdoor unit.
7. Put the unit to the ground on the outdoor unit side.
8. Select control cables from the conditions given in page
12
.
Caution:
Be sure to put the unit to the ground on the outdoor unit side. Do not con-
nect the ground cable to any gas pipe, water pipe, lightening rod, or telephone
ground cable. Incomplete grounding may cause a risk of electric shock.
Types of control cables
1. Wiring transmission cables
•Types of transmission cables
Design wiring in accordance with the following table <Table 1>.
• Cable diameter
More than 1.25 mm
2
[AWG16]
[Selecting non-fuse breaker (NF) or ground breaker (NV)]
To select NF or NV instead of a combination of Class B fuse with switch, use the
following:
• In the case of Class B fuse rated 15 A or 20 A,
NF model name (MITSUBISHI): NF30-CS (15 A) (20 A)
NV model name (MITSUBISHI): NV30-CA (15 A) (20 A)
Use an ground breaker with a sensitivity of less than 30 mA 0.1 s.
[Outdoor unit]
Thickness of wire for main power supply, on/off capacities
<Power source: 460V>
Main cable
Swtich (A)
Minimum wire thickness (mm
2
[AWG])
Branch
Capacity Fuse
Breaker for
Ground
Model Unit combination Breaker for current leakage
wiring (NFB)(A)
Outdoor
unit
PUHY-P72YHMU-A(-BS)
-
PUHY-P96YHMU-A(-BS)
-
PUHY-P120YHMU-A(-BS)
-
15 A 30 mA or 100 mA 0.1 sec. or less
20 A 30 mA or 100 mA 0.1 sec. or less
25 A 30 mA or 100 mA 0.1 sec. or less
Maximum
current (A)
10.3
16.4
22.6
2.1 [14] - 2.1 [14] 15 15 15
3.3 [12] - 3.3 [12] 20 20 20
5.3 [10] - 5.3 [10] 25 25 25
<Power source: 208V / 230V>
Main cable
Swtich (A)
Minimum wire thickness (mm
2
[AWG])
Branch
Capacity Fuse
Breaker for
Ground
Model Unit combination Breaker for current leakage
wiring (NFB)(A)
Outdoor
unit
PUHY-P72THMU-A(-BS)
-
PUHY-P96THMU-A(-BS)
-
PUHY-P120THMU-A(-BS)
-
30 A 30 mA or 100 mA 0.1 sec. or less
40 A 30 mA or 100 mA 0.1 sec. or less
50 A 100 mA 0.1 sec. or less
Maximum
current (A)
22.7
36.3
49.9
5.3 [10] - 5.3 [10] 30 30 30
13.3 [6] - 13.3 [6] 40 40 40
21.2 [4] - 21.2 [4] 50 50 50