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TM5-4120-384-14
5 - 2 1 . FLUID FLUID RESTRICTOR.-Continued
a.
Removal.
Disconnect input power from the air conditioner
before performing maintenance on any part of the
electrical system.
The voltages used can be lethal.
(1)
Disconnect
power
at
power
source.
(2) (Models F18H-3S and F18H-1S) Remove top front cover
(Models F18H-3SA and F18H-3SB) Remove top cover (para
(3) Discharge
and
purge
the
refrigerant
system
per
and 5-12.
(4)
Unwrap
insulation
on
joints
to
be
debrazed.
(5) Debraze restrictor at expansion valve and evaporator coil
See paragraph 5-13.
capillary tubes.
Take care that expansion
valve is not damaged during debrazing operations.
Replace.
If
restrictoz
is
suspected
bad
replace
it.
b.
c.
Installation.
(1) Carefully place restrictor
in
position
between
expansion
valve and evaporator coil tubing.
(2) Braze restrictor
to
expansion
valve
in
accordance
with
(3)
Braze
capillary
tubes
to
restrictor.
(4)
Replace
(See
(5)
Perform
leak
test
per
(6)
Rewrap
insulation
that
was
removed
prior
to
debrazing.
(7) (Models F18H-3S and F18H-lS) Install top front cover
(Models F18H-3SA and F18H-3SB) Install top cover
(8) Evacuate and charge
refrigeration
system
in
accordance
with paragraph 5-15 and 5-16.
5-47
Change 2
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