ACM-410D-IM (11/12)
Page 9
All refrigerant piping joints and connections in the EarthLinked® heating and cooling system,
including the Auxiliary Cooling Module, line sets and earth loop system are to be brazed with
15% silver content brazing alloy, utilizing the
NITROGEN BRAZING PROCESS.
IMPORTANT!
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.
