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 TM5-4120-384-14
5-22.
EXPANSION
VALVE
(PRIMARY).-Continued
(b)
Insert
sensing
bulb
from
expansion
valve
into
bulb
well.
(c)
Move
bulb
back
and
forth
to
distribute
the
mastic.
open end
of
(d)
Set bulb about
one
inch
(2.5
cm)
beyond
bulb well.
(8) (Models F18H-3S and F18H-1S) Install three top covers
(Models F18H-3SA and F18H-3SB) Install top c o v e r
(9) Evacuate and charge the refrigeration
system
in
accordance with paragraphs 5-15 and 5-16.
5-23. EXPANSION VALVE (QUENCH).
The liquid quench expansion valve is factory set at a superheat
of
Do not
16 1/2F (8.9 0.3C) at 32F (0C) bath temperature.
attempt field adjustment of this valve.
Removal.
a.
(See
(1)
Disconnect
power
at
power
source.
(2) (Models F18H-3S and F18H-1S) Remove top rear cover (para
(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
the
expansion
valve.
(5) Soften the thermal mastic in bulb well using a cloth
wrung out in hot water, a heat lamp, or heat gun if necessary and
withdraw the bulb from the well.
(6)
Debraze two tube connections to valve.
If
flush
bushing
is
to be
reused, remove it from old valve.
(7)
Remove
two
screws,
post
spacers,
brackets,
and
lock
nuts.
(8)
Remove
valve
from
the
unit.
Replace.
b.
If
expansion
valve
is
suspected
bad
replace
it.
Installation.
c.
(1)
Install
flush
bushing
in
valve.
Change 2
5-50
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