Plumbing Materials And Storage Methods; Refrigerant Piping Installation; Precautions On Pipe Connection / Valve Operation - LG ARUN080LTE4 Installation Manual

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Plumbing materials and storage methods

Pipe must be able to obtain the specified thickness and should be
used with low impurities.
Also when handling storage, pipe must be careful to prevent a frac-
ture, deformity and wound.
Should not be mixed with contaminations such as dust, moisture.
Refrigerant piping on three principles
Drying
Should be no moisture
inside
Moisture
Items
- Significant hydroly- - Degradation of re-
sis of refrigerant oil frigerant oil
- Degradation of re-
- Poor insulation of
frigerant oil
the compressor
- Poor insula'tion of
Cause
- Do not cold and
the compressor
failure
warm
- Do not cold and
warm - Clogging of EEV,
Capillary
- Clogging of EEV,
Capillary
- No moisture in the pipe - No dust in the pipe.
- Until the connec- - Until the connec-
tion is completed, tion is completed,
the plumbing pipe the plumbing pipe
entrance should be entrance should be
strictly controlled. strictly controlled.
- Stop plumbing at - Pipe entrance
rainy day. should be taken
Coun- side or bottom.
- Pipe entrance
termea-
should be taken - When removal burr
side or bottom. after cutting pipe,
sure
pipe entrance
- When removal burr
should be taken
after cutting pipe, pipe
down.
entrance should be
taken down. - Pipe entrance
should be fitted cap
- Pipe entrance
when pass through
should be fitted cap
the walls.
when pass through
the walls.
Nitrogen substitution method
Welding, as when heating without nitrogen substitution a large
amount of the oxide film is formed on the internal piping.
The oxide film is a caused by clogging EEV, Capillary, oil hole of accu-
mulator and suction hole of oil pump in compressor.
It prevents normal operation of the compressor.
In order to avoid this problem, Welding should be done after replacing
air by nitrogen gas.
When welding plumbing pipe, the work is required.
Welding Point
Oxide scale
Note) should not block the outlet side.
When the internal pressure in pipe is abo
ve the atmospheric pressure, pinhole is o
ccurred and it is a leakage cause.
Cleanliness Airtight
There is no refrigerant
No dust inside.
leakage
Dust
Leakage
- Gas shortages
- Degradation of re-
frigerant oil
- Poor insulation of
the compressor
- Do not cold and
warm
- Airtightness test
should be.
- Brazing operations
to comply with
standards.
- Flare to comply
with standards.
- Flange connections
to comply with
standards.
Regulator
Nitrogen gas
Pressure 0.02MPa less
Auxiliary valve
Taping
(Should not
contain air)
! 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
Gas pipe
Refrigerant
Charging Port
! 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