21
Installation manual
Select the power supply for the indoor units and outdoor
units separately.
The power supply should have a specified branch circuit
with a leakage protector and manual switch.
The power supply, leakage protector, and manual for all the
indoor units connecting to the same outdoor unit should be
universal. (Set the power supply for all indoor units in one
system on the same circuit. It should turn the units on and
off at the same time, or it will degrade service life or stop the
units from turning on at all.)
Install the connective wiring system between the indoor and
outdoor units together with the refrigerant piping system.
Use a 3-core shielded wire as a signal wire between indoor
and outdoor units. A multi-core wire is unavailable.
Comply with relevant National Electric Standard.
Power wiring should be completed by a professional
electrician.
CAUTION
6.5 Electric wiring system and installation
Separate Power Supply (without power facility) (See
Table.6-3)
With power facilities
Outdoor unit
power supply
Leakage
protector
Manual
switch
Outdoor unit
Outdoor unit
Outdoor unit
Outdoor unit
GND
GND
GND
GND
Branch box
C
380-415V 3N~ 50Hz/60Hz
Fig.6-5
Fig.6-6
NOTE
Select the power cord for these models separately according
to relevant standard.
The wiring diameter and the length in the table indicate that
the voltage drop range is within 2%. If the length exceeds the
above figure, please select the wire diameter according to
the relevant standard.
Table.6-3
Power
supply
Leakage
protector
Size
(Continuous length
of pipe m)
Capacity
Fuse
Grounding
wire
Model
Item
Min. Power wire diameter (mm
2
)
Wiring of mental and synthetic resin
Manual switch
(A)
8~12HP
380-415V
3N~ 50Hz
/60Hz
100mA
0.1sec or
less
16HP
4×10 mm
2
(<20 m)
4×16 mm
2
(<50 m)
4×10 mm
2
(<20 m)
4×16 mm
2
(<50 m)
1×10 mm
2
1×10 mm
2
40
35
32
25
Manual
switch for
the leakage
protector
GND
Branch box
Outdoor unit
GND
Outdoor unit
GND
Outdoor unit
GND
Outdoor unit
GND
Outdoor unit
GND
Outdoor unit
6.5.1 Outdoor unit power wiring
(b)
(a)
Power facilities 1
(with leakage protector)
Power facilities 2
(with leakage protector)
( a )
Select the wire diameter
Power wiring refers to the main wire (a) connecting to branch
box and the wiring (b) between branch box and power
facilities. Please select the wire diameter according to the
following requirements.
Diameter of main wire (a)
Depends on the total horsepower of the outdoor unit and
following table.
e.g., In system: (8Hp×1unit+8Hp×1unit+10Hp×1unit)
Total Hp=26Hp→(Table.6-3)→size of wire=35mm2(within
50m)
Wiring (b): between the branch box and power equipment.
Depends on the total number of outdoor units. Fewer than
five means the diameter is the same as of the diameter of the
main wire (a); More than six requires two electric control
boxes. The diameter of the wiring depends on the total
horsepower of outdoor units connecting to each electric
control box and the following table.
Select wire diameter (≥) (table.6-4) (unit :mm
2
)
18HP
4×16 mm
2
(<20 m)
4×25 mm
2
(<50 m)
1×16mm
2
50
40
20~22HP
4×16 mm
2
(<20 m)
4×25 mm
2
(<50 m)
1×16mm
2
63
50
14HP
4×10 mm
2
(<20 m)
4×16 mm
2
(<50 m)
1×10 mm
2
40
35
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