LG ARUN50GS2A Quick Manual page 10

10
Indoor unit
[kW(Btu/h]
Gas
<5.6(19,100) 12.7(1/2)
<16.0(54,600) 15.88(5/8)
<22.4(76,400) 19.05(3/4)
Firmly hold copper tube in a bar(or die) as indicated dimension in the
table above.
Check
- Compare the flared work with figure below.
- If flare is noted to be defective, cut off the flared section and do flar-
ing work again.
Smooth all round
Inside is shining without scratches.
Inclined
Even length
all round
Flare shape and flare nut tightening torque
Precautions when connecting pipes
- See the following table for flare part machining dimensions.
- When connecting the flare nuts, apply refrigerant oil to the inside and
outside of the flares and turn them three or four times at first. (Use
ester oil or ether oil.)
- See the following table for tightening torque.(Applying too much torque may
cause the flares to crack.)
- After all the piping has been connected, use nitrogen to perform a
gas leak check.
Pipe size Tightening torque
mm N.m(kgf.cm)
Ø9.52 32.7-39.9(327~399)
Ø12.7 49.5-60.3(495~603)
Ø15.88 61.8-75.4(618~754)
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.
Unit : mm(inch)
Pipe " A "
Liquid Gas Liquid
1.6~1.8 1.1~1.3
6.35(1/4)
(0.63~0.71) (0.43~0.51)
1.6~1.8 1.5~1.7
9.52(3/8)
(0.63~0.71) (0.59~0.67)
1.9~2.1 1.5~1.7
9.52(3/8)
(0.75~0.83) (0.59~0.67)
= Improper flaring =
Surface Cracked Uneven
damaged thickness
A Flare shape
mm
±2
90°
12.8-13.2
A
16.2-16.6
R=0.4~0.8
19.3-19.7
Union
Opening shutoff valve
1
Remove the cap and turn the valve counter clockwise with the
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 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
Outside diameter
mm
Ø6.35
Ø9.52
Ø12.7
Ø15.88
Ø19.05
Heat insulation
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 "KS Standard
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 fol-
lowing procedure:
- Heat insulation material to be prepared... Adiabatic glass wool
with thickness 10 to 20mm.
- Stick glass wool on all air conditioners that are located in ceiling
atmosphere.
- In addition to the normal heat insulation (thickness: more than
8mm) for refrigerant piping (gas piping: thick piping) and drain pip-
ing, add further 10mm to 30mm thickness material.
Indoor unit
Torque
N.m(kgf . cm)
inch
1/4 18~25(180~250)
3/8 34~42(340~420)
1/2 55~66(550~660)
5/8 63~82(630~820)
3/4 99~121(990~1210)
Fastening band
(accessory)
Refrigerant piping
Thermal insulator
(accessory)