Piping Materials And Handling - LG Multi V Installation Manual

avoid introducing foreign materials in the pipe.
REFRIGERANT PIPING
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.
Piping Preparation, continued.
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 – 0.8
Tightening the Flare Nuts
Tightening Torque for Flare Nuts.
Pipe Size (in. O.D.) Outside Diameter (mm)
1/4
3/8
1/2
5/8
3/4
1. When connecting the flare nuts, coat the flare (inside and outside) with
polyvinyl ether (PVE) refrigeration oil only.
Do not use polyolyester (POE) or any other type of mineral oil as a lubricant. These lubricants are not compatible with PVE oil used in
this system and create oil sludge leading to equipment damage and system malfunction.
2. Initially hand tighten the flare nuts using three (3) or four (4) turns.
3. To finish tightening the flare nuts, use both a torque wrench and a backup wrench.
4. After all the piping has been connected and the caps have been tightened, check for refrigerant gas leaks.
Loosening the Flare Nuts
Always use two (2) wrenches to loosen the flare nuts.

Piping Materials and Handling

Pipes used for the refrigerant piping system must include the specified thickness, and the
interior must be clean.
While handling and storing,
nate the interior with dust, moisture, etc.
Keep refrigerant pipe dry, clean, and airtight.
No moisture should be inside the piping.
22
Tightening Torque (ft-lbs.)
13.0 - 18.0
6.35
9.52 24.6 - 30.4
39.8 - 47.7
12.7
45.4 - 59.3
15.88
71.5 - 87.5
19.05
do not bend or damage the pipes, and take care not to contami
No dust should be inside the piping.
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.
Moisture
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
-
Clean
Dust
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
Keep Pipes Capped While Storing.
Airtight
No leaks should occur.
Leaks
Yoke
Cone
Uneven
Thickness