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www.manitowocfsusa.com 800-225-9916 8
Cleanliness:
Condensing units and evaporator coils are cleaned and dehydrated at the factory. The
condensing unit must remain closed and pressurized until the piping is complete and
final connections are ready to be made.
CAUTION
The maximum air exposure for dehydrated condensing units is 15 minutes. Systems
exposed longer than 15 minutes must have the compressor oil and drier filter replaced.
Leaving a system exposed to the atmosphere for more than 15 minutes can result in
premature system failure.
Do not remove system tubing covers until work is ready to be performed. Ensure that
all refrigeration tubing is clean and dry prior to installation. Use only tubing cutters when
trimming tubing to the proper length. Do not use saws to cut tubing.
CAUTION
The use of saws to cut tubing can contaminate the system with copper chips causing
premature system failure.
Brazing joints require a dry inert gas, typically nitrogen, be passed through the lines at a
low pressure to prevent scaling and oxidation. Use only silver solder brazing alloys.
Minimize the amount of flux to prevent internal contamination. Flux only the male
portion of the joint. Thoroughly clean fluxed joints after brazing.
CAUTION
Dry inert gas must be passed through the system while brazing to prevent scaling and
oxidation. Scaling and oxides can clog refrigeration components resulting in system
failure.
Pipe Supports:
All tubing should be supported in a least two locations (near the end of each tubing run).
Long runs will require additional support. As a guide, support 3/8” to 7/8” pipe every five
feet, 1-1/8” to 1-3/8” every seven feet, and 1-5/8” to 2-1/8” every ten feet. Do not leave
a corner unsupported when changing directions. Place supports within 2 feet of each
direction change. Piping that is attached to a vibrating object (such as a compressor or
compressor base) must be supported in a manner that will not restrict the movement of
the vibrating object. Rigid mounting will fatigue the tubing causing refrigerant leaks.
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