LG Multi F A2UW14GFA0 Engineering Product Data Book page 303

2. Guideline for each installation process
Choice of material for refrigerant piping
NOTE
Copper pipe selection
a. The wall thickness of the refrigerant piping should comply with relevant local and national regulation for
R410A the design pressure is 3.8MPa.(38.7kgf/cm
b. If not, we recommend to use with phosphorus deoxidized copper type
c. Generally used copper pipe specifications as follows;
* Never use the pipe which is mixed scrap or a pipe used somewhere else
The method how to distinguish the pipe mixed scarp : check the oxidization evidence after leaving the pipe for 24hour.
CAUTION
Flare connection and procedure
1. Stiffened pipe must always be annealed at least once
prior to the flaring work.
2. A pipe cutter must be used to cut the pipe.
(A large pipe cutter must be used where
the pipe has a large diameter. When cutting
a pipe which is too big for the pipe cutter a
metal saw may be used but care must be
taken to ensure that the debris from sawing
does not get into the pipe.)
External diameter of pipe D
(in)
1/4
3/8
1/2
5/8
3/4
CAUTION
1. Burrs should be carefully removed.
2. 2 spanners should be used to grip the pipe.
3. The flare nut must be inserted before starting the flaring operation.
4. The appropriate amount of torque should be used to tighten the flare nut.
5. Check that there is no superficial damage to the surface of the flare.
Size(ø)mm
6.35
9.52
12.70
15.88
19.05
A
D
(mm)
6.35
9.52
12.7
15.88
19.05
2 )
Thickness
R22
0.7
0.8
0.8
0.8
0.8
3. Set the flaring tool to make sure the flare size remains
within the prescribed limits.
4. Coat the inner and outer surface of the
flare with refrigerator oil (Ester or ether
oil).
(this ensures that the flare nut passes
smoothly, preventing the pipe
from twisting.)
Do not use SUNISO-4GS oil.
Pipe widening dimension A
Heat pump 50Hz/R410A
R410A
0.8
0.8
0.8
1.0
1.0
Oil Oil
8.6~9.0
12.6~13.0
15.8~16.2
19.0~19.4
22.9~23.3
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