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TM 9-4120-367-14
TM 07592B-14/1
6.2 LEAK TEST. - Continued
Location/Item
Leak Tester
- Continued
Action
c.
d.
e.
f.
g.
h.
i.
j.
k.
l.
m.
n.
o.
Open both charging valves and allow refrigerant
to flow into system until gauges indicate 50 psig
(3.5 kg/cm2).
Close both charging valves, charging manifold
valves and refrigerant drum valve.
Disconnect refrigerant cylinder.
Connect nitrogen regulator (paragraph 3.1) to
nitrogen cylinder.
Connect nitrogen regulator to center connection
on charging manifold.
Open nitrogen regulator valve slowly.
Open discharge service valve and suction ser-
vice valve. Do not turn on air conditioner.
Slowly open both valves on charging manifold
and charge system to 350 psig (22 kg/cm2).
Close all valves.
NOTE
Tester must be calibrated for a pure
refrigerant leak rate of 0.1 ounce
(2.84 g) per year.
Turn on electronic leak detector and slowly pass
probe around all points in the system where a
leak could exist.
Depending upon the type of detector used, a leak
will be indicated by an audible signal, a light, or
by meter deflections.
When a leak is found, mark the leak point.
Disconnect hose between charging manifold and
nitrogen regulator.
Remarks
6-8
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