REFRIGERANT DESIGN | 69
Refrigerant Piping Design & Layout Best Practices
Due to our policy of continuous product innovation, some specications may change without notication.
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LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG ” is a registered trademark of LG Corp.
INSTALLATION & LAYOUT BEST PRACTICES
Piping Connection
Single Zone Wall Mount Outdoor Unit Connections
1. Remove the tubing cover by loosening the fastening screws. See
Figure 37.
2. Align the center of the refrigerant pipe and corresponding
connection as shown in Figure 38.
3. Place a couple of drops of refrigerant oil on the opening rim of the
flare before assembling. Ensure you do not add any
contaminants. Tighten the flare nut initially by hand.
4. Finish tightening the flare nut with a torque wrench until the
wrench clicks. See Figure 39.
Figure 37: Outdoor Unit Connection Cover Removal
When tightening the are nut with a torque wrench, ensure
the direction for tightening follows the arrow on the wrench..
Table 43: Torque Wrench Tightening
Outside Diameter
(inches)
Torgue (lbs-ft)
1/4
13-18
3/8
24.6-30.4
1/2
39.8-47.7
5/8
45.6-59.3
3/4
71.6-87.5
Figure 38: Pipe Attachment Figure 39: Heat Pump Outdoor Unit Piping Connection
Outdoor Unit
Gas Side Piping
(larger diameter)
Liquid Side Piping
(smaller diameter)
Torque Wrench
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