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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 Pipe Connections
Indoor units come with flare type connections. It is the installer’s option to use the flare fittings provided or braze the indoor unit to the
refrigerant piping system.
Flare Fittings:
• All unit are ttings are 45° and rate for high-pressure R410A
refrigerant.
• Properly form all are ttings using best practices.
• Place a drop of PVE oil on the outside of the are tting before
tightening.
Note:
• Do not use any other type of oil (including traditional POE
refrigeration oil) as a lubricant. Failure to follow this procedure may
lead to restrictions in the refrigeration components.
• Do not over-tighten flare nuts. Excessive tightening will cause
fittings to crack.
• Multi V refrigeration system components contain very small capil-
lary tubes, small orifices, electronic expansion valves, oil separa-
tors, and heat exchangers that can easily become blocked
Figure 34: Typical Refrigerant Line Flare Fitting Insulation Detail
No Clearance
Overlap Insulation Where the
Port and the Piping Meet
Insulation for Indoor Unit Port
(Field Supplied)
Insulation for Refrigerant
Piping (Field Supplied)
Insulation Clip (Field Supplied)
Connecting the Indoor Unit Piping to the Field-Installed Piping
Note:
• If the drain hose is routed inside a room, add insulation to prevent
condensation from forming.
• Seal up any access holes in walls or ceilings with bushing.
1. Center align the indoor unit piping (refrigerant and drain) and the
field-installed piping, then hand tighten the flare nut.
2. Tighten the flare nut with a torque wrench.
3. Attach the drain tube piping to the indoor unit drain hose as
shown.
4. Wrap insulation material around the connection, overlapping the
material and binding securely with vinyl tape so there are not
gaps. (See Piping Bundling” section for instructions.)
Indoor unit piping
Flare nut Field-installed
piping
Spanner
Field-installed
piping
Flare nut
Torque
wrench
Figure 35: Indoor Unit to Field-Installed Piping Connection.
Narrow tape
Adhesive
Drain extension
Indoor unit
drain hose
Figure 36: Extending the Drain Hose.
REFRIGERANT PIPING
Pipe Connections
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