Plumbing Materials And Storage Methods - LG ARUN BTE4 Series Installation Manual

Opening shutoff valve
1
Remove the cap and turn the valve counter clockwise with the
hexagon wrench.
2
Turn it until the shaft stops.
Do not apply excessive force to the shutoff valve. Doing so may
break the valve body, as the valve is not a backseat type. Always
use the special tool.
3
Make sure to tighten the cap securely.
Closing shutoff valve
1
Remove the cap and turn the valve clockwise with the hexagon
wrench.
2
Securely tighten the valve until the shaft contacts the main body seal.
3
Make sure to tighten the cap securely.
* For the tightening torque, refer to the table on the below.
Tightening torque
Tightening torque N·m(Turn clockwise to close)
Shaft
Shutoff
(valve body)
valve
size
Opened Hexagonal
Closed
wrench
Ø6.35
6.0±0.6
Ø9.52 4mm
Ø12.7 10.0±1.0
Ø15.88 12.0±1.2 5.0±0.0
5mm
Ø19.05 14.0±1.4
Ø22.2
30.0±3.0 8mm
Ø25.4
Insulation of shutoff valve
1
Use the heat insulation material for the refrigerant piping which has
an excellent heat-resistance (over 120°C).
2
Precautions in high humidity circumstance:
This air conditioner has been tested according to the "ISO Condi-
tions with Mist" and confirmed that there is not any default. How-
ever, if it is operated for a long time in high humid atmosphere
(dew point temperature: more than 23°C), water drops are liable to
fall. In this case, add heat insulation material according to the fol-
lowing procedure:
- Heat insulation material to be prepared... EPDM (Ethylene Propy-
lene Diene Methylene)-over 120°C the heat-resistance tempera-
ture.
- Add the insulation over 10mm thickness at high humidity environ-
ment.
Indoor unit
Gas line piping
Cap Service Flare
(Valve lid) port nut attached to unit
16±2
17.6±2.0
38±4
20.0±2.0 55±6
-
12.7±2 75±7
110±10
25.0±2.5
-
25±3
Fastening band
(accessory)
Refrigerant piping
Thermal insulator
(accessory)

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)
9