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Piping
Liebert
®
SRC
™
User Manual 40
5.2.2 Refrigerant-piping System Insulation
For specific insulation procedures, see 5.4 - Piping Insulation.
5.2.3 Selecting Field-supplied Copper Tubing
Copper is the only approved refriger ant-pipe material for use with the Liebert SRC, and Emerson
recommends seamless phosphorous deoxidized ACR type copper pipe, hard-drawn rigid type “K” or “L,” or
annealed-tempered, copper pipe.
• Drawn temper (rigid) ACR copper tubing is availabl
e in sizes 3/8 through 2-1/8 inches (ASTM B 280,
clean, dry, and capped).
• Annealed temper (soft) ACR copper tubing is available in sizes 1/4 through 2-1/8 inches (ASTM B 280,
clean, dry, and capped).
NOTE
All refrigerant piping, field-provided isolation ball valves, service valves, and elbows shall be
completely insulated using closed-cell pipe insulation. The liquid and vapor lines must be insulated
separately.
To prevent heat loss/heat gain through the refrigerant5 piping, all refrigerant piping, including liquid
lines and vapor lines shall be insulated separately. Insulation shall be a minimum 1/2-in. thick, and
thickness may need to be increased based-on ambient conditions and local codes.
All insulation joints shall be glued with no air gaps. Insulation material shall fit snugly against the
refrigeration pip3e with no air space between it and the pipe. Insulation passing through pipe
hangers, inside conduit, and/or sleeves must not be compressed. Protects insulation inside
handers and supports with a second layer. All pipe insulation exposed to the sun and outdoor
elements shall 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.
The design engineer should perform calculations to determine if the factory-supplied insulation
jackets are sufficient to meet local codes and avoid sweating. Add additional insulation if
necessary. Mark all pipes at the pint where the insulation jacket ends. Remove the jacket. Install
field-provided insulation on the run-out and main-trunk pipes first. Peel the adhesive glue protector
slip from the insulation jacket and install the clam-shell jacket over the fitting.
NOTE
Tube wall thickness should meet local code requirements and be approved for
an operating pressure of 551 psi. If local code does not specify wall thickness,
Emerson suggests using tube thickness per Table 5-4. When bending tubing,
try to keep the number of bends to a minimum, and use the largest radii
possible to reduce the equivalent length of installed pipe. Also, bending radii
greater than 10 pipe diameters can minimize pressure drop. Be sure that no
traps or sags are present when rolling-out soft copper-tubing coils.
Table 5-4 ACR copper-tubing material
Type Seamless phosphorous deoxidized
Class UNS C12200 DHP
Straight Lengths H58 temper
Coils O60 temper
MFL67502030 17. 7. 13. 오오 3:05 Page 50
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