Piping Preparations - LG ARNU243S8R2 Installation Manual

REFRIGERANT PIPING
Piping Preparation
Do not braze in an enclosed location.
for gas leaks before / after brazing.
If the refrigerant combusts, it generates a toxic gas that may cause physical injury or death.
1. Do not use kinked pipe caused by excessive bending in one specific area on its length.
2. Braze the pipes to the service valve pipe stub of the outdoor unit.
3. After brazing, check for refrigerant gas leaks.
4. When selecting flare fittings, always use a 45° fitting rated for use with high pressure refrigerant R410A. Selected fittings must also
comply with local, state, or federal standards.
Creating a Flare Fitting
One of the main causes of refrigerant leaks is defective flared
connections. Create flared connections using the procedure below.
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 clean the pipe with dry nitrogen.
Dimensions of the Flare.
90°
"A"
R=0.4
40
Do not allow the refrigerant to leak during brazing. Always test
– 0.8
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
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