Plumbing Materials And Storage Methods - LG Multi V PRHR042A Installation Manual

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
(valve body)
size
(mm
Hexagonal
Closed Opened
(inch))
wrench
Ø 6.35
(1/4)
6.0±0.6
(4.4±0.4)
Ø 9.52 4 mm
(3/8) (0.16 inch)
Ø 12.7 10.0±1.0
(1/2) (7.4±0.7)
Ø 15.88 12.0±1.2 5.0±0.0
(5/8) (8.9±0.9) (3.7±0.4)
5 mm
(0.24 inch)
Ø 19.05 14.0±1.4
(3/4) (10.3±1.0)
Ø 22.2
(7/8)
30.0±3.0 8 mm
(22.1±2.2) (0.31 inch)
Ø 25.4
(1)
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
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 [73.4 °F]), water drops
are liable to fall. In this case, add heat insulation material according
to the following procedure:
Union
Gas line
Cap Service piping
Flare nut
(Valve lid) port
attached
to 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
(81.1±7.4)
25.0±2.5
(18.4±1.8)
-
25±3
(18.5±2.2)
- Heat insulation material to be prepared:
EPDM (Ethylene Propylene Diene Methylene)-over 120 °C
[248 °F] the heat-resistance temperature.
- Add the insulation over 10 mm [0.39 inch] thickness at high
humidity environment.
Indoor unit

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
Should be no
moisture inside
Moisture
- Significant
hydrolysis of
refrigerant oil
- Degradation of
refrigerant oil
- Poor insula'tion of
the compressor
- Do not cold and
warm
- Clogging of EEV,
Capillary
-
- No moisture in the
pipe
- Until the
connection is
completed, the
plumbing pipe
entrance should be
strictly controlled.
- Stop plumbing at
rainy day.
- Pipe entrance
should be taken
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.
Fastening band
(accessory)
Refrigerant piping
Thermal insulator
(accessory)
Cleanliness Airtight
There is no refrigerant
No dust inside.
leakage
Dust
- Degradation of - Gas shortages
refrigerant oil
- Degradation of
- Poor insulation of refrigerant oil
the compressor
- Poor insulation of
- Do not cold and the compressor
warm
- Do not cold and
- Clogging of EEV, warm
Capillary
- No dust in the - Airtightness test
pipe. should be.
- Until the - Brazing operations
connection is to comply with
completed, the standards.
plumbing pipe
- Flare to comply
entrance should be
with standards.
strictly controlled.
- Flange connections
- Pipe entrance
to comply with
should be taken
standards.
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.
11
Leakage