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Compressor units are shipped from the factory with a low pressure nitrogen holding charge. Carefully
relieve the holding charge when the compressor unit is being prepared to connect refrigerant system
piping.
This compressor unit is equipped with POE lubricant. POE lubricant
absorbs significant amounts of moisture from the air very rapidly.
Exposure of the POE lubricant to air must be minimized. Even a few
minutes of exposure to air can be harmful to the system.
After the initial nitrogen holding charge has been released from the
compressor unit, it is critical that air not be allowed to enter the
compressor unit during the process of preparing compressor unit
refrigerant connections (tube cutting, deburring, cleaning, brazing, etc).
To ensure air does not enter the compressor unit while preparing
refrigerant connections, "trickle" dry nitrogen through the compressor
unit, entering at the access port nearest the Active Charge Control
(ACC), to keep airborne moisture out of the compressor unit and the
POE lubricant.
Complete preparing and brazing all compressor unit refrigerant
connections at one setting to minimize exposure of open connections
to air. Failure to implement the above precautions will result in an
extended period of time to effectively evacuate the system, and may
adversely affect system performance and cause system failure.
REFRIGERANT PIPING CONNECTIONS
Refrigerant joints are to be brazed with 15% silver content brazing
alloy, utilizing the NITROGEN BRAZING PROCESS.
PURPOSE:
Utilize the NITROGEN BRAZING PROCESS on all brazed refrigerant
piping connections. This process eliminates oxidation products from
inside joint surfaces.
TECHNIQUE:
"Trickle" nitrogen gas at 1-2 psi pressure through the joint area being
brazed, to displace the oxygen. When oxygen has been displaced,
turn off the nitrogen, and relieve the pressure at the joint to
atmospheric prior to brazing.
CONSEQUENCES:
Failure to displace oxygen with nitrogen at the brazed joint will result
in particulate matter being released into the system. The result is
discoloration of refrigerant oil, contamination of the system and
possible system failure.
SD-410-QS (H) (06/15)
Caution!
Caution!
NITROGEN BRAZING PROCESS
Page 11
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