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FLARING AND BRAZING PROCEDURES
Flaring and Brazing Procedures
One of the main causes of refrigerant leaks is a defective connection. For LG HVAC systems, the installer needs to know how perform both
flared and brazed connections successfully.
• 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 Procedure
state, or federal standards.
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.
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.
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.
Dimensions of the Flare.
90°
"A"
R=0.4
36
–
0.8
©
Copper
1.
tube
2A.
Point
down
3.
Bar
Copper pipe
4.
Smooth
Even Length
Flared Connection Dimensions / Tightening Torque.
Pipe Size (in. O.D.)
Outside Diameter (mm)
1/4
3/8
1/2
5/8
3/4
Slanted Uneven Rough
90°
Pipe
2B.
Flare nut
Copper
Reamer
tube
Handle
Bar
Red arrow
Clamp handle
Inside is shiny with no scratches
Incorrect Flare
Cracked
Slanted
Surface
Damaged
"A" Dimension (mm [in.])
~ 9.1 (11/32 - 23/64)
6.35
9.52
~ 13.2 (1/2 - 33/64)
~ 16.6 (41/64 - 21/32)
12.7
~ 19.7 (49/64 - 25/32)
15.88
19.05
Yoke
Cone
Uneven
Thickness
-
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