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TM 5-4120-361-14
(7) Disconnect the pressure cutout
switch flare nut from the refrigerant
line tee.
(8) Remove the capillary tube grom-
met in the back wall of the charging
valve box and extract the capillary tube
and flare nut through the opening.
b.
Testing.
Test the pressure cut-
out switch as described in paragraph
4-33.
c.
Installation.
(1) Refer to figure 5-6 and in-
stall capillary tube and grommet in
charging valve box.
(2) Mount pressure cutout switch to
charging valve box.
(3) Attach pressure cutout switch
and charging valve flare nuts to refrig-
eration lines.
(4) Refer to para 5-6 and leak test
the refrigeration system.
(5) Place charging valve box in po-
sition and attach to housing.
(6) Refer to wiring diagram (fig-
ure 1-5 or figure 1-6) and attach elec-
trical leads to pressure cutout switch.
Attach service valve flare nuts.
(7) Refer to figure 6-1 and purge
tile refrigeration system.
1.
Caution should be exer-
cised with fluorocarbon re-
frigerant gas (freons) as they
can displace oxygen and there-
by cause suffocation.
2.
Personnel with a history
or other evidence of cardiac
rhythm abnormalities should be
made aware of the potential
for aggravation of existing
cardiac rhythm abnormalities
or the induction of arryth-
mias, as a result of exposure
to fluorocarbon refrigerant
gases (freons).
Such indivi-
duals should be evaluated by
local medical authorities be-
fore working in environments
where potential freon exposure
may occur.
(8) Refer to figure 6-2 and charge
the refrigeration system.
(9) Refer to figure 4-20 and in-
stall charging valve box access cover.
5-23.
Pressure Relief Valve.
a.
General.
In the event the re-
frigerant system pressure should exceed
455 ± 10 psig, the pressure relief valve
“pops off” to restore normal pressure in
the system.
It may happen, that having
once opened, the pressure relief valve
does not totally seal closed when normal
pressure is restored.
In order not to
constitute a continuous system leak, the
valve must be replaced.
b.
Removal.
(1) Refer to figure 4-4 and remove
front top cover.
1.
Caution should be exer-
cised with fluorocarbon re-
frigerant gas (freons) as they
can displace oxygen and there-
by cause suffocation.
2.
Personnel with a history
or other evidence of cardiac
rhythm abnormalities should be
made aware of the potential
for aggravation of existing
cardiac rhythm abnormalities
or the induction of arryth-
hmias, as a result of exposure
to fluorocarbon refrigerant
gases (freons).
Such indivi-
duals should be evaluated by
local medical authorities be-
fore working in environments
where potential freon exposure
may occur.
(2) Refer to figure 6-1 and dis-
charge the refrigeration system.
(3) Refer to figure 5-7 and remove
the clamp around the pressure relief
valve by removing the screw and washer
that hold the clamp to the condenser fan
housing.
5-16
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