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Refrigerant Piping Connections
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REFRIGERANT PIPING CONNECTIONS
Liquid Pipe
Communication Cables
Gas Pipe
Power Wiring
Insulation
A
B
C
D
E
E
D
D
B
A
C
Surface of
Indoor Unit Casing
Field-Provided
Pipe 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 insulation inside hangers and supports with a second layer. All pipe insulation exposed to direct sunlight and deterioration-produc-
ing 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 job site conditions. Maximum refrigerant pipe temperature is 227 °F;
minimum refrigerant pipe temperature is -4 °F. Add additional insulation if necessary.
Figure 42: Typical Pipe Insulation, Power Wire and
Communications Cable Arrangement
Figure 43: Typical Insulation
Butt-Joint at Indoor Unit Casing
Refrigerant Piping Insulation
Figure 44: Typical Refrigerant
Flare Fitting Insulation Detail
•
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.
