TM 9-4120-403-14
Figure 5-7. Nitrogen Purging Connection
g
Close the un-used valve on the charging manifold, and open the one with the nitrogen tank hook up.
h
Open the nitrogen cylinder valve and adjust the regulator so that less then 1 - 2 cfm (0. 028-0. 057
m3/minute) of nitrogen flows through the system.
i
Check discharge from hose attached to the low pressure charging valve to be sure that no oil is being
forced out of the system.
j
Allow nitrogen to sweep through the system at the rate of less than1 2 cfm (0. 028-0. 057 m3/minute)
for a minimum of 5 minutes, before starting any brazing operation. Then allow it to continue to flow at the same rate until
all brazing operations are completed. (See paragraph 5-9 for brazing/debrazing procedures.)
k
After installation brazing operations are completed, allow nitrogen to flow for a minimum of 5 minutes.
l
Close nitrogen cylinder valve, nitrogen regulator, charging manifold valve, and both high and low
pressure service valves on the unit.
m
Disconnect the hose from the nitrogen tank.
n
5-17