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 TM5-4120-384-14
5-14.
LEAK
TESTING.-Continued
(2) To pressurize a system that has been discharged and
purged, for leak testing with an electronic detector:
(a)
Connect
hoses
from
charging
manifold
to
charging
valves.
(b)
Connect drum of Refrigerant-22
to
center
hose
connection
of service manifold.
Connect the Refrigerant-22 drum
so
that
only
gas
will
be used for pressurization.
(c)
Open
both
unit
charging
valves
and
charging
manifold
valves.
(d) Open refrigerant drum valve slightly and adjust as
necessary to prevent formation of frost: and, allow system pressure
t o b u i l d u p u n t i l g a g e s r e a d 4 0 - 5 0 p s i ( 2 . 8 - 3 . 5 k g / c m2 ) .
(e)
Close
charging
manifold
valves
and
refrigerant
drum
valve.
--
(f)
Remove
Refrigerant-22
drum
from
center
hose
connection.
(g) Connect
a
cylinder
of
dry
to
center
hose
connection.
(h) Open the charging manifold valves and the nitrogen
cylinder valve: allow system pressure to build up until gages read
3 5 0 p s i ( 2 4 . 7 k g / c m2 ) .
(i) Perform leak tests, then discharge and purge system,
in
accordance with paragraphs 5-11 and 5-12 before performing
maintenance, or before evacuating and charging system, as
appropriate.
(3) Final Leak Testing.
Always perform a final leak test
after performing any repair or
replacement of components before the
air conditioner is reassembled
and the refrigeration system is
evacuated and charged.
5-32
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