Piping Insulation; Figure 5-36 Typical Pipe-Insulation, Power Wire, And Communications-Cable Arrangement - Emerson Liebert SRC18 User Manual

5.4 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-in. thick, and the thickness
may need to be increased based on ambient conditions and local codes. All refrigerant piping, including
field-supplied 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 refrigerations pipe with now 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-producing
elements must be properly protected with a PVC-aluminum vapor-barrier jacket, or 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
void sweating at job-site conditions. Maximum refrigerant-pipe temperature is 227°F. Minimum refrigerant-
pipe temperature is –4°F. Add additional insulation if necessary.
NOTE
• 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.

Figure 5-36 Typical pipe-insulation, power wire, and communications-cable arrangement

C
D
B
E
Liquid Pipe
A
Gas Pipe
B
C Power Wiring
Insulation
D
Communication Cables
E
63
D
A
Liebert
Piping
®
SRC™ User Manual