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REFRIGERANT PIPING
Outdoor Unit Connections
Outdoor Unit Connection Installation
1. Remove the piping cover and / or piping / control box cover (configuration depends on outdoor unit model) from the unit by loosening the
fastening screws.
2. Refer to the figures below for liquid and gas (vapor) piping attachments onto the outdoor unit.
3. Remove the flare nuts attached to the outdoor unit valves.
4. Thread the flare nuts onto the field-supplied piping.
5. Flare the end of the piping following the information in the "General Refrigerant Piping System" section and industry best practices.
6. Place a couple of drops of PVE refrigerant oil on outside of the flare before assembling.
7. Align the center of the refrigerant piping and corresponding connection as shown below and on the next page.
8. Connect the field piping to the outdoor unit connection. Tighten the flare nut initially by hand.
9. Finish tightening the flare nut with a torque wrench until the wrench clicks. Follow torque guidelines in the table below. See figures for
correct connection points.
Figure 32: LUU090HV, LUU120HV, LUU180HV, and LUU240HV Piping
/ Control Box Cover Removal (Appearances Will Differ Depending on
Model).
Terminal Block
Conduit
Cable Clamp
Figure 34: Removing the Flare Nuts on the
Outdoor Unit.
• When tightening the flare nut with a torque wrench, ensure the direction for tightening follows the arrow on the wrench.
• To prevent insects or small animals from entering and damaging interior components, plug gaps / access holes with field-supplied putty or
insulation.
40
Communication / Connection (Power)
Cable Terminal (ODU to IDU)
Power Wiring Terminal (to ODU Only)
Liquid Piping
Wiring Diagram
Vapor Piping
Piping Cover
Figure 35: Connecting the Flared Field Piping
to the Outdoor Unit Connection.
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.
Do not add any contaminants.
Figure 33: LUU090HV, LUU120HV, LUU180HV, and LUU240HV Piping
Connections (Appearances Will Differ Depending on Model).
Table 19: Torque Wrench Tightening.
Pipe Size
(in. O.D.)
1/4
3/8
1/2
5/8
3/4
Liquid Piping
(Smaller Diameter)
Vapor Piping
(Larger Diameter)
Torque Wrench
Outside
Torque
Diameter (mm)
(ft-lbs.)
6.35
13.0 - 18.0
9.52
24.6 - 30.4
12.7
39.8 - 47.7
15.88
45.4 - 59.3
19.05
71.5 - 87.5
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