LG MULTI V ARNU073TUD4 Installation Manual page 40

REFRIGERANT PIPING
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.
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Insulating the Refrigerant Piping
Sufficiently insulate all cold surfaces to prevent moisture forming. All refrigerant 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 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.
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Due to our policy of continuous product innovation, some specifications may change without notification.
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Figure 25: Typical Refrigerant Line Flare Fitting Insulation Detail.
Insulation for Indoor Unit Port
(Field Supplied)
Insulation Clip (Field Supplied)
No Clearance
Insulation for Refrigerant
Piping (Field Supplied)
Overlap Insulation Where the
Port and the Piping Meet