Best Practices for LG HVAC System Installation
9
Best Practices for LG HVAC System Installation
Due to our policy of continuous product innovation, some specications may change without notication.
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3. Flaring the pipe end.
• Use the proper size flaring tool to finish flared connections as
shown.
• ALWAYS create a 45° flare when working with R410A.
1. Cut the pipe to length.
• Measure the distance between the indoor unit and the outdoor unit.
• Cut the pipes a little longer than measured distance.
2A. Remove the burrs.
• Completely remove all burrs from pipe ends.
• When removing burrs, point the end of the copper pipe down to
avoid introducing foreign materials in the pipe.
2B. Slide the flare nut onto the copper tube.
90°
Slanted Uneven Rough
Pipe
Reamer
Point
down
Flare nut
Copper
tube
Bar
Copper pipe
Clamp handle
Red arrow
Cone
Bar
Slanted
Smooth
Uneven
Thickness
1�
2A� 2B�
3�
4�
4. Carefully inspect the flared pipe end.
• Compare the geometry with the figure to the right
• If the flare is defective, cut it off and re-do procedure.
• If flare looks good, blow the pipe clean with dry nitrogen.
90°
45°
“A”
R=0.4 – 0.8
Dimensions of the Flare.
Pipe Size (in� O�D�) “A” Dimension (mm [in�])
1/2
1/4
5/8
3/8
3/4
Flared Connection Dimensions / Tightening Torque.
Handle
Incorrect Flare
Even Length
Cracked
Yoke
Inside is shiny with no scratches
Surface
Damaged
Copper
tube
Outside Diameter (mm)
6.35
9.52
12.7
15.88
19.05
~ 9.1 (11/32 - 23/64)
~ 13.2 (1/2 - 33/64)
~ 16.6 (41/64 - 21/32)
~ 19.7 (49/64 - 25/32)
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Flaring Procedure
Flaring and Brazing Procedures
One of the main causes of refrigerant leaks is a defective connection. For VRF systems, the installer needs to know how perform both flared
and brazed connections successfully.
When selecting are ttings, always use a 45° tting rated for use with high pressure refrigerant R410A. Selected ttings must also comply with local,
state, or federal standards.
• During installation, it is imperative to keep the piping system free of contaminants and debris such as copper burrs, slag, or carbon dust.
• Do not use kinked pipe caused by excessive bending in one specific area on its length.
FLARING AND BRAZING PROCEDURES