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 TM5-4120-384-14
5 - 2 2 . EXPANSION VALUE (PRIMARY).
The (primary) expansion valve is factory set at a superheat temperature of
6 1/2F (3.3 0.3C) at 32F (0C) bath temperature. Do not attempt field
adjustment of the valve.
(See
a.
Removal.
(1)
Disconnect
power
at
power
source.
(2) (Models F18H-3S and F18H-lS) Remove three top covers
(Models F18H-3SA and F18H-3SB) Remove top cover (para
(3) Discharge
and
purge
refrigeration
system
per
and 5-12.
(4)
Unwrap
insulation
from
joints
of
expansion
valve.
(5) Soften thermal mastic in the bulb well using a cloth
wrung out in hot water, a heat lamp, or heat gun if necessary and
withdraw bulb from bulb well.
(6)
Debraze
two
tube
connections
and
restrictor
connection
to
valve.
(7)
Remove
valve
from
unit.
Replace.
If
expansion
valve
is
suspected
bad
replace
it.
b.
Installation.
c.
(1)
Place
expansion
valve
in
unit
and
align
tubing
ends.
(2) Protect valve from
overheating during brazing operations.
Direct flame away from valve
body and wrap valve body with wet
rags.
(3)
Braze
joints
in
accordance
with
(4)
Replace
(See
(5) Leak test all newly connected joints
and
all
tube
(See para 5-14.)
connections in the area.
(6)
Rewrap
insulation
at
expansion
valve
joints.
(7)
Install
sensing
bulb
in
bulb
well.
Insert approximately
one
ounce
of
thermal
mastic
in
(a)
bulb well.
Change 2
5-48
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