Refrigerant Piping Installation - LG Multi V ARWN Series Installation Manual

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
- Clogging of EEV,
warm
- Clogging of EEV, Capillary
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.
! 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 refrigerant
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)
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)

REFRIGERANT PIPING INSTALLATION

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.
Cautions in pipe connection/valve operation
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)
CLOSE OPEN
! WARNING
After completing work, securely tighten both service ports and
caps so that gas does not leak.
Ball Valve
Elbow
(Liquid Pipe)
① Pipe joint (auxiliary parts): Securely perform brazing with a nitrogen
blow into the service valve port.(Releasing pressure : 0.02 MPa 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)
h Remove the front panel before pipe
connection
h Must check the pipe (liquid pipe, gas
pipe, high/low pressure common
pipe) before pipe connection
Liquid pipe
Ball Valve(Gas Pipe)
High/Low pre
common pipe
Liquid pipe
Liquid pipe
Gas pipe
Gas pipe
High/Low pressure
High/Low pressure
common pipe
common pipe
11
Gas pipe