Preparation Of Piping - LG ZRUM080LTS6 Installation Manual

Preparation of Piping

Main cause of gas leakage is defect in flaring work. Carry out correct
flaring work in the following procedure.
Cut the pipes and the cable
- Use the accessory piping kit or the pipes purchased locally.
- Measure the distance between the indoor and the outdoor unit.
- Cut the pipes a little longer than measured distance.
- Cut the cable 1.5 m (4.92 ft) longer than the pipe length.
Copper
Slanted Uneven Rough
tube
90°
Burrs removal
- Completely remove all burrs from the cut cross section of pipe/tube.
- Put the end of the copper tube/pipe to downward direction as you
remove burrs in order to avoid to let burrs drop in the tubing.
<Wing nut type>
Bar
"A"
Copper pipe
Flaring work
- Carry out flaring work using flaring tool as shown below.
Pipe diameter
Inch (mm)
Wing nut type
Ø 1/4 (Ø 6.35) 0.04~0.05(1.1~1.3)
Ø 3/8 (Ø 9.52) 0.06~0.07(1.5~1.7)
Ø 1/2 (Ø 12.7) 0.06~0.07(1.6~1.8)
Ø 5/8 (Ø 15.88) 0.06~0.07(1.6~1.8)
Ø 3/4 (Ø 19.05) 0.07~0.08(1.9~2.1)
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
flaring 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.
- Only Annealed pipe should be used for flared joint.
- The outside diameter of pipe should be smaller than 20 mm.
Pipe
Reamer
Point down
<Clutch type>
A inch (mm)
Clutch type
0~0.02
(0~0.5)
= Improper flaring =
Surface Cracked Uneven
damaged thickness
Tightening Torque
Pipe size
N . m (lbs . ft)
[mm (inch)]
Ø 9.52 (3/8) 38±4 (28±3.0)
Ø 12.7 (1/2) 55±6 (41±4.4)
Ø 15.88 (5/8) 75±7 (55±5.2)
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
R32 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)
A [mm (inch)] Flare shape
90° ±2
12.8 (0.5)~13.2 (0.52)
A
16.2 (0.64)~16.6 (0.65)
R=0.4~0.8
19.3 (0.76)~19.7 (0.78)
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)
17
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