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Piping
63 Liebert
®
SRC™ 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 join ts must be glued with no air gaps. Insul
ation 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.
Figure 5-3
6 Typical pipe-ins u lation, power wire, and communications-cable arrangement
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.
Liquid Pipe
Communication Cables
Gas Pipe
Power Wiring
Insulation
A
B
C
D
E
E
D
D
B
A
C
MFL67502030 17. 7. 13. 오오 3:05 Page 73
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