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INSULATION
Refrigerant Piping System Insulation
All refrigerant piping from the outdoor unit to the indoor units must be insulated correctly for safety and usage. Refrigerant piping, field-pro-
vided isolation ball valves (if present), service valves, and elbows must be properly and completely insulated using closed cell pipe insulation
(up to the indoor unit piping connections). To prevent heat loss / heat gain through the refrigerant piping, all refrigerant piping including liquid
lines and vapor lines must be insulated separately. Insulation must be a minimum 1/2 inches thick, and thickness may need to be increased
based on ambient conditions and local codes. Table on next page lists minimum wall thickness requirements for Ethylene Propylene Diene
Methylene (EPDM) insulation.
Inside the outdoor unit, maximum pipe temperature is 248°F and minimum pipe temperature is -40°F. For field insulation of refrigerant piping
between outdoor units and indoor units, consider the following pipe temperature ranges for an operating heat pump system:
• Heating mode refrigerant temperature ranges: Liquid = 75-118°F; High Pressure Vapor = 95-220°F
• Cooling mode refrigerant temperature ranges: Liquid = 75-118°F; Low Pressure Vapor = 40-90°F
All insulation joints must be glued with no air gaps. Insulation material must fit snugly against the refrigeration pipe with no air space between
it and the pipe.
Do not allow insulation passing through pipe hangers, inside conduit, and/or sleeves to be compressed. Protect insulation
inside hangers and supports with a second layer. All pipe insulation exposed to the sun and outdoor elements must be properly protected
with PVC, aluminum vapor barrier, or alternatively placed in a weather-resistant enclosure such as a pipe rack with a top cover; and meet
local codes.
Figure 69: Typical Insulation Butt-
Joint at Indoor Unit Casing.
Surface of
Indoor Unit Casing
46
Figure 70: Typical Refrigerant
Flare Fitting Insulation Detail.
Field-Provided
Pipe Insulation
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 71: Insulating the Shut Off / Isolation Ball Valve (If Present).
Indoor Unit
Cable Tie, etc.
(Field Supplied)
Refrigerant Piping
Insulation (Field Supplied)
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