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Page Title:
PURGING THE REFRIGERANT SYSTEM. (Cont) |
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 TM5-4120-384-14
5-12.
THE
REFRIGERANT
SYSTEM.-Continued
Assuming that the system has been discharged using
a
manifold
as
described in paragraph 5-11 proceed as follows:
a . S e e s p e c i f i c component removal instructions.
On models
F18H-3S and F18H-1S i t m a y b e n e c e s s a r y t o r e m o v e t o p r e a r c o v e r
prior to connecting hoses to service valves.
t h a t refrigerant
has
been
discharged.
b.
Be
sure
(See
para
5-11.)
Connect center hose from charging
manifold
to
a
nitrogen
c.
regulator and dry nitrogen bottle.
d.
The hose from the high pressure
charging
valve
to
the
charging manifold should be connected.
e.
The hose from the low pressure charging
valve
should
be
disconnected from the charging manifold.
f.
Open
both
charging
valves
on
unit.
Close the unused valve on the charging
manifold
and
open
the
g.
one connected to the high pressure hose.
h.
Open the nitrogen cylinder valve and
adjust the
regulator so
t h a t a p p r o x i m a t e l y 1 - 2 c f m ( 0 . 0 2 8 - 0.057
m/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
o flow through the system at the rate of 1
-
3
2 cfm (0.028 - 0.057 m /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.
k.
After installation brazing operations are
completed,
allow
nitrogen to flow for a minimum of 5 minutes.
Close nitrogen cylinder valve, nitrogen regulator, charging
l.
manifold valve, and both high and low pressure charging valves on
the unit.
Disconnect
hose
from
nitrogen
tank.
m.
n.
Assuming
that
all
repairs
are
completed,
go
to
Change 2
5-27
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