Refrigerant Pipe Connections; Insulate Refrigerant Pipes - LG ARNU073TUC4 Instruction Manual

REFRIGERANT PIPING
A properly installed pipe system will have sufficient support so that pipes will not sag during the life of the system. As necessary, place supports
closer for segments where potential sagging could occur. Maximum spacing of pipe supports must meet local codes.
Figure 16: Pipe Support at Indoor Unit.

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 flare fittings are 45° and rate for high-pressure R410A refrigerant.
• Properly form all flare fittings using best practices.
• Place a drop of PVE oil on the outside of the flare fitting 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.
Brazed Connections
Note:
Multi V refrigeration system components contain very small capillary tubes, small orifices, electronic expansion valves, oil
separators, and heat exchangers that can easily become blocked.

Insulate Refrigerant Pipes

Sufficiently insulate all cold surfaces to prevent moisture forming.
All pipes must be insulated and each pipe must be separately
wrapped. Use field-provided one-half (1/2) inch thick (or thicker)
closed-cell insulation. The thickness may need to be increased
based on ambient conditions and local codes.
Wrap all refrigerant and condensate piping including field-
provided isolation ball valves and flexible pipe connection
kits provided by LG. Glue all insulation joints with no air gaps
between insulation segments, and between insulation segments
and the unit case. Ensure insulation material fits snugly against
the refrigeration pipe with no air space between the pipe surface
and the surrounding insulation.
Protect insulation inside hangers and supports with a second
insulation layer. Ensure insulation on all pipe passing through
pipe hangers, inside conduit, and/or sleeves is not compressed.
34
B
A
A + B ~ 12" – 19"
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.
Figure 17: Typical Pipe Support Location—Change in Pipe Direction.
~ 12" – 19"
Figure 18: Typical Refrigerant Line Flare Fitting Insulation Detail
Insulation for Indoor Unit Port
(Field Supplied)
Insulation Clip (Field Supplied)
No Clearance
Max. 12"
Insulation for Refrigerant
Piping (Field Supplied)
Overlap Insulation Where the
Port and the Piping Meet