LG MULTI V S ARUN060GSS4 Installation Manual page 10

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
Ø6.35(1/4)
6.0 ±0.6
(4.4±0.4)
Ø9.52(3/8)
10.0 ±1.0
Ø12.7(1/2)
(7.4±0.7)
12.0 ±1.2 5.0 ±0.5
Ø15.88(5/8)
(8.9±0.9) (3.7±0.4)
14.0 ±1.4
Ø19.05(3/4)
(10.3±1.0)
Ø22.2(7/8) 30.0 ±3.0
Ø25.4(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 [248 °F]).
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 [73.4 °F]), 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 Propy-
lene Diene Methylene)-over 120 °C [248 °F] the heat-resistance
temperature.
- Add the insulation over 10 mm [13/32 inch] thickness at high hu-
midity environment.
Indoor unit
Union
Cap Service
piping attached
(Valve lid) port
Hexagonal
17.6±2.0
(13.0±1.5)
4mm
(0.16inch)
20.0±2.0
(14.8±1.5)
12.7±2
(9.4±1.5)
5mm
(0.24inch)
25.0±2.5
(18.4±1.8)
8mm
(0.31inch) (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 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
Items
- Significant hydroly-
sis of refrigerant oil
- Degradation of re-
frigerant oil
- Poor insula'tion of
Cause
the compressor
failure
- Do not cold and
warm
- Clogging of EEV,
Capillary
- No moisture in the pipe
Gas line
- Until the connec-
tion is completed,
to unit
the plumbing pipe
entrance should be
strictly controlled.
- Stop plumbing at
rainy day.
Coun-
- Pipe entrance
-
termea-
should be taken
side or bottom.
sure
- When removal burr
after cutting pipe, pipe
entrance should be
25±3.0
taken down.
- 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 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.
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
There is no refrigerant
No dust inside.
Dust
Moisture
- Degradation of re- - Gas shortages
frigerant oil
- Degradation of re-
- Poor insulation of
the compressor
- Poor insulation of
- Do not cold and
warm
- Do not cold and
- Clogging of EEV,
Capillary
- No dust in the pipe. - Airtightness test
- Until the connec-
tion is completed, - Brazing operations
the plumbing pipe
entrance should be
strictly controlled.
- Flare to comply
- Pipe entrance
should be taken
- Flange connections
side or bottom.
- When removal burr
after cutting pipe,
pipe entrance
should be taken
down.
- Pipe entrance
should be fitted cap
when pass through
the walls.
Regulator
Welding Point
Nitrogen gas Pressure
0.02MPa(2.9psi) less
Auxiliary valve
Taping
(Should not
contain air)
Airtight
leakage
Leakage
frigerant oil
the compressor
warm
should be.
to comply with
standards.
with standards.
to comply with
standards.