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12
!
CAUTION
1 Always use the nitrogen.(not use oxygen, carbon dioxide, and
a Chevron gas): Please use the following nitrogen pressure
0.02MPa Oxygen – Promotes oxidative degradation of refrig-
erant oil. Because it is flammable, it is strictly prohibited to
use Carbon dioxide – Degrade the drying characteristics of
gas Chevron Gas – Toxic gas occurs when exposed to direct
flame.
2 Always use a pressure reducing valve.
3 Please do not use commercially available antioxidant.
The residual material seems to be the oxide scale is ob-
served. In fact, due to the organic acids generated by oxida-
tion of the alcohol contained in the anti-oxidants, ants nest
corrosion occurs. (causes of organic acid · alcohol + copper +
water + temperature)
REFRIGERANT PIPING INSTALLATION
Precautions on Pipe connection / Valve operation
Pipe connection is done by connecting from the end of the pipe to the
branching pipes, and the refrigerant pipe coming out of the outdoor
unit is divided at the end to connect to each indoor unit. Flare connec-
tion for the indoor unit, and welding connection for the outdoor pipe
and the branching parts.
- Use hexagonal wrench to open/close the valve.
Liquid pipe
Low Pressure Gas pipe
High Pressure Gas pipe
!
WARNING
• Always careful not to leak the refrigerant during welding.
• The refrigerant generates poisonous gas harmful to human body
if combusted.
• Do not perform welding in a closed space.
• Be sure to close the cap of the service port to prevent gas leak-
age after the work.
!
CAUTION
Please block the pipe knock outs of the front and side panels after
installing the pipes.
(Animals or foreign objects may be brought in to damage wires.)
Service Port
Refrigerant Charging Port
Connection of Outdoor units
2, 3, 4 Outdoor Units
Outdoor units
Model
Low Pressure Gas Pipe
I.D.28.58
C
ARCNB21
2 Unit
C
I.D.31.8
I.D.34.9
I.D.41.3 I.D.38.1 O.D.34.9
130
C
3 Unit
C
ARCNB31
I.D.41.3
I.D.41.3 O.D.34.9
C
4 Unit
ARCNB41
A
I.D.44.48 I.D.53.98
C
For more information, refer accessory installation manual.
Y branch
A
To outdoor unit
A
B
To branch piping or indoor unit
Facing
Facing
downwards
upwards
Within ± 3°
Within ± 3°
Installation procedure for HR unit
1. Using an insert-hole-in- anchor, hang the hanging bolt.
2. Install a hexagon nut and a flat washer (locally-procured)to the hang-
ing bolt as shown in the figure in the bottom, and fit the main unit to
hang on the hanger metal.
3. After checking with a level that the unit is level, tighten the hexagon
nut.
* The tilt of the unit should be within ±5° in front/back and left/right.
4. This unit should be installed suspended from ceiling and side A
should always be
facing up.
5. Insulate not used pipes completely as shown in the figure.
Six-sided Nut
(M10 or M8)
Hanger metal
Hanger metal
Hanger metal
Flat washer
Flat washer
Flat washer
(M10)
Hanging bolt
Hanging bolt
Hanging bolt
(M10 or M8)
Liquid Pipe
High Pressure Gas Pipe
331
416
334
408
314
281
I.D.28.58
I.D.15.88
I.D.15.88
111
I.D.12.7
I.D.9.52
83
I.D.22.2
I.D.19.05
I.D.22.2
I.D.19.05
I.D.22.2 O.D.19.05
I.D.28.58
I.D.12.7
I.D.15.88
70
341
334
416
298
281
408
I.D.28.58
I.D.34.9
111
83
I.D.19.05
I.D.22.2
I.D.19.05
I.D.31.8
I.D.34.9
I.D.41.3 I.D.38.1 O.D.34.9
I.D.28.58
I.D.15.88
I.D.12.7
125
130
415
334
341
375
298
281
83
I.D.19.05
134
I.D.22.2
I.D.19.05
I.D.41.3
I.D.41.3
I.D.25.4
O.D.22.2
I.D.41.3 O.D.34.9
I.D.15.88
I.D.12.7
I.D.28.58
80
125
Within +/- 10°
B
Viewed from point A
in direction of arrow
A
Insulation
I.D.19.05
83
I.D.15.88
I.D.12.7
I.D.28.58
111
I.D.22.2
I.D.28.58
I.D.34.9
111
I.D.28.58
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