39
Installation Manual
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.
REFRIGERANT PIPING
Piping Preparation
Table 15: Tightening Torque for Flare Nuts.
Do not use polyolyester (POE) or any other type of mineral oil as a thread lubricant. These lubricants are not compatible with the PVE oil used
in this system and create oil sludge leading to equipment damage and system malfunction.
Do not add any contaminants inside the refrigerant piping.
1. When connecting the flare nuts, coat the flare (outside only) with polyvinyl ether (PVE) refrigeration oil only.
Pipe size (in. O.D.) Outside Diameter (mm) Tightening torque (ft-lbs)
1/4 6.35 13.0 - 18.0
3/8 9.52 24.6 - 30.4
1/2 12.7 39.8 - 47.7
5/8 15.88 45.4 - 59.3
3/4 19.05 71.5 - 87.5
Tightening the Flare Connections
Loosening the Flare Nuts
Always use two (2) wrenches to loosen the flare nuts.
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.
Table 16: Flared Connection Dimensions / Tightening Torque.
Pipe size (in.
O.D.)
Outside Diameter (mm) “A” Dimension (mm [in.])
1/4 6.35 ~ 9.1 (11/32 - 23/64)
3/8 9.52 ~ 13.2 (1/2 - 33/64)
1/2 12.7 ~ 16.6 (41/64 - 21/32)
5/8 15.88 ~ 19.7 (49/64 - 25/32)
3/4 19.05 -
90°
45°
“A”
R=0.4 – 0.8
Flaring Procedure, continued.
Figure 32: Flaring procedure.
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