Plumbing Materials And Storage Methods - LG MULTI V S ARUB060GSS4 Installation Manual

10
CAUTION
!
• Always use a charge hose for service port connection.
• After tightening the cap, check that no refrigerant leaks are present.
• When loosening a flare nut, always use two wrenches in
combination, When connecting the piping,
always use a spanner and torque wrench
in combination to tighten the flare nut.
• When connecting a flare nut, coat the
flare(inner and outer faces) with oil for
R410A(PVE) and hand tighten the nut
3 to 4 turns as the initial tightening.
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(lbs ft) (Turn clockwise to close)
Shut off
Shaft(valve body)
valve size
[mm(inch)]
Closed Opened Hexagonal
Ø 6.35 (1/4) 6.0 ±0.6
(4.4±0.4)
Ø 9.52 (3/8)
4 mm
(0.16 inch)
10.0 ±1.0
Ø 12.7 (1/2)
(7.4±0.7)
Ø 15.88 12.0 ±1.2 5.0 ±0.5
(5/8) (8.9±0.9) (3.7±0.4)
5 mm
(0.24 inch) 25.0±2.5
Ø 19.05 14.0 ±1.4
(3/4) (10.3±1.0)
Ø 22.2 (7/8) 30.0 ±3.0
8 mm
(0.31 inch)
Ø 25.4 (1.0) (22.1±2.2)
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
Conditions with Mist" and confirmed that there is not any default.
However, 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
following procedure:
- Heat insulation material to be prepared... EPDM (Ethylene
Propylene Diene Methylene)-over 120 °C the heat-resistance
temperature.
- Add the insulation over 10 mm thickness at high humidity
environment.
Indoor unit
Union
Gas line piping
Cap Service
Flare nut attached to
(Valve lid) port
unit
16±2(12±1.5)
17.6±2.0
(13.0±1.5)
38±4(28±3.0)
20.0±2.0 55±6
(14.8±1.5) (41±4.4)
-
12.7±2 75±7
(9.4±1.5) (55±5.1)
110±10
(18.4±1.8) (81.1±7.4)
25±3.0
-
(18.5±2.2)
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
fracture, deformity and wound.
Should not be mixed with contaminations such as dust, moisture.
Refrigerant piping on three principles
Drying Cleanliness
Should be no moisture
No dust inside.
inside
Moisture
- Significant hydrolysis - Degradation of
of refrigerant oil refrigerant oil
- Degradation of
- Poor insulation of the
refrigerant oil
compressor
- Poor insula'tion of the
- Do not cold and warm
compressor
- Clogging of EEV,
- Do not cold and warm
Capillary
- Clogging of EEV,
Capillary
- No moisture in the - No dust in the pipe.
pipe
- Until the connection is
- Until the connection is completed, the
completed, the plumbing pipe
plumbing pipe entrance should be
entrance should be strictly controlled.
strictly controlled.
- Pipe entrance should
- Stop plumbing at rainy be taken side or
day. bottom.
- Pipe entrance should - When removal burr
be taken side or after cutting pipe, pipe
entrance should be
bottom.
taken down.
- When removal burr
after cutting pipe, pipe - Pipe entrance should
entrance should be be fitted cap when
taken down. pass through the
walls.
- Pipe entrance should
be fitted cap 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
accumulator 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.
Airtight
There is no refrigerant
leakage
Dust
Leakage
- Gas shortages
- Degradation of
refrigerant 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
0.02 MPa (2.9 psi) less
Auxiliary valve
Taping
(Should not
contain air)