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REFRIGERANT PIPING CONNECTIONS
Refrigerant Piping Insulation
Refrigerant Piping Insulation
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" thick, and thickness may need to be increased based on ambient conditions and local codes.
All refrigerant piping including field-provided isolation ball valves, service valves, and elbows must be completely insulated using closed-cell
pipe insulation. 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. Insulation passing through pipe hangers, inside conduit, and/or sleeves must not be compressed. Protect in-
sulation inside hangers and supports with a second layer. All pipe insulation exposed to direct sunlight and deterioration-producing elements
must be properly protected with a PVC-aluminum vapor barrier jacket, or alternatively placed in a weather-resistant enclosure such as a pipe
rack with a top cover. The design engineer should perform calculations to determine if the factory-supplied insulation jackets have sufficient
thickness to meet local codes and to avoid sweating at jobsite conditions. Maximum refrigerant pipe temperature is 227°F; minimum refriger-
ant pipe temperature is -4°F. Add additional insulation if necessary.
Figure 46: Typical Pipe Insulation, Power Wire and
Communications Cable Arrangement
C
D
B
E
Liquid Pipe
A
Gas Pipe
B
Power Wiring
C
Insulation
D
Communication Cables
E
• Do not insulate gas and liquid pipes together as this can result in pipe leakage and malfunction due to extreme temperature fluctuations.
• Be sure to fully insulate the piping connections.
32
Figure 47: Typical Insulation
Butt-Joint at Indoor Unit Casing
D
A
Surface of
Indoor Unit Casing
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 48: Typical Refrigerant
Flare Fitting Insulation Detail
Field-Provided
Pipe Insulation
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