LG multi V ARWB Series Installation Manual Download Page 12

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ENGLISH

1 Always use the nitrogen.(not use oxygen, carbon dioxide, and a

Chevron gas): Please use the following nitrogen pressure
0.02Mpa (2.9psi) Oxygen – Promotes oxidative degradation of re-
frigerant 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

→

a copper

+ water + temperature)

CAUTION

Cautions in pipe connection/valve operation

WARNING

After completing work, securely tighten both service ports and
caps so that gas does not leak.

WARNING

Always use extreme care to prevent the refrigerant gas (R410A)
from leakage while using fire or flame. If the refrigerant gas
comes in contact with the flame from any source, such as a gas
stove, it breaks down and generates a poisonous gas which can
cause gas poisoning. Never perform brazing in an unventilated
room. Always conduct an inspection for gas leakage after installa-
tion of the refrigerant piping has been completed.

Open status when both the pipe and the valve are
in a straight line.

Cut both the pipe and the valve with a cutter to
suit the length
[Don't cut the length of less than 70mm(2-3/4”)]

CLOSE

OPEN

❈

Remove the front panel before pipe
connection

❈

Must check the pipe (liquid pipe, low
pressure gas pipe, high pressure gas
pipe) before pipe connection

①

Pipe joint (auxiliary parts): Securely perform brazing with a nitrogen
blow into the service port.(Releasing pressure : 0.02 MPa(2.9psi) or
less)

②

Cap: Remove caps and operate valve, etc. After operation, always
reattach caps (tightening torque of valve cap: 25Nm (250kg-cm) or
more). (Don't remove the internal part of the port)

③

Service port: Make the refrigerant pipe vacuum and charge it using
the service port. Always reattach caps after completing work (tight-
ening torque of service cap: 14Nm (140kg-cm) or more).

④

Liquid pipe

⑤

Gas pipe

⑥

Elbow joint (field supply)

Elbow

Ball Valve(Gas Pipe)

Ball Valve

(Liquid Pipe)

Liquid pipe

Gas pipe

Liquid pipe

Gas pipe

Liquid pipe

Low pressure gas pipe

High pressure gas pipe

Connection of Outside units

(Master)

(Slave1)

(Master)

(Slave1)

(Slave2)

2 Unit

3 Unit

ARCNN21

ARCNN31

Outside units

Model

Low Pressure Gas Pipe

Liquid Pipe

High Pressure Gas Pipe

O.D25.4(1) I.D22.2(7/8) I.D19.05(3/4)

120(4-23/32)

O.D19.05(3/4)

I.D15.88(5/8)

I.D12.7(1/2)

110(4-11/32)

O.D25.4(1)

I.D22.2(7/8)

80(3-5/32)

O.D12.7(1/2) I.D9.52(3/8)

70(2-3/4)

453(17-27/32)
491(19-9/32)

111
(4-3/8)

I.D28.58(1-1/8)

I.D34.9(1-3/8)

I.D28.58(1-1/8)

I.D31.8(1-1/4)

I.D25.4(1)

I.D31.8(1-1/4)

I.D25.4(1)

I.D28.58(1-1/8)

I.D31.8(1-1/4)

130(5-1/8)

416(16-3/8)
408(16-1/16)

111(4-3/8)

I.D.38.1(1-1/2)

I.D.34.9(1-3/8)

O.D.34.9(1-3/8)

I.D.41.3(1-5/8)

I.D.31.8(1-1/4)

I.D.28.58(1-1/8)

I.D.22.2(7/8)

331(13-1/32)

314(12-3/8)

O.D.19.05(3/4)

I.D.19.05(3/4)

I.D.15.88(5/8)

I.D.22.2(7/8)

I.D.12.7(1/2)

I.D.9.52(3/8)

70(2-3/4)

83(3-9/32)

O.D.19.05(3/4)

I.D.15.88(5/8)

I.D.22.2(7/8)

I.D.12.7(1/2)

334(13-5/32)

281(11-1/16)

83(3-9/32)

I.D.34.9(1-3/8)

O.D.34.9(1-3/8)

125(4-29/32)

406(16)

353(13-29/32)

111(4-3/8)

I.D34.9(1-1/8)

I.D.28.58(1-1/8)

I.D.41.3(1-5/8)

I.D38.1(1-1/2)

I.D.41.3(1-5/8)

471(18-17/32)
517(20-11/32)

125(4-29/32)

I.D41.3(1-5/8)

I.D38.1(1-1/2)

I.D34.9(1-3/8)

I.D28.58(1-1/8)

I.D19.05
(3/4)

I.D22.2(7/8)

O.D28.58(1-1/8)

120(4-23/32)

I.D19.05
(3/4)

I.D22.2(7/8)

O.D28.58(1-1/8)

120(4-23/32)

O.D15.88(5/8)

I.D9.52(3/8)

I.D12.7(1/2)

110(4-11/32)

O.D12.7(1/2)

I.D6.35(1/4)

I.D9.52(3/8)

110(4-11/32)

O.D.19.05(3/4)

I.D.12.7(1/2)

I.D.15.88(5/8)

X 2

110(4-11/32)

130(5-1/8)

I.D12.7(1/2)

I.D19.05
(3/4)

I.D22.2(7/8)

I.D41.3(1-5/8)

I.D38.1(1-1/2)

I.D41.3(1-5/8)

O.D34.9(1-3/8)

O.D38.1(1-1/2)

O.D28.58(1-1/8)

O.D15.88(5/8)

90(3-17/32)

70(2-3/4)

120(4-23/32)

I.D19.05(3/4) I.D15.88(5/8)

O.D22.2(7/8)

I.D28.58(1-1/8)

I.D22.2(7/8)

* Install the branch pipe between outside units so that the outlet pipe

is parallel to the surface.

Y branch

To outside unit

To branch piping or indoor unit

Facing

upwards

Facing

downwards

Within ± 3°

Viewed from point A
in direction of arrow

/- 10

When installing the branch pipe vertically between the outside
units, the refrigerant can be uneven between the outside units,
leading to compressor burn and reduced capacity.

CAUTION

REFRIGERANT PIPING INSTALLATION