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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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