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(4) Check for continuity between terminals
of pressure switch. Continuity should be indi-
cated. If continuity is not indicated, the high-
-pressure cutout switch is defective and must be
replaced.
b. Removal.
(1) Refer to figure 3-4 and remove front
and top access covers.
(2) Refer to figure 3-6 and remove fresh
air inlet screen.
(3) Discharge the refrigerant system (para
6-3).
(4) Refer to figure 3-10 and remove control
panel.
(5) Refer to figure 5-11 and remove the
high-pressure cutout switch.
c. Installation.
(1) Install the high-pressure cutout switch
in reverse order of removal.
(2) Pressure test, evacuate, and recharge
the refrigerant system (para 6-5).
5-20. Low-Pressure Cutout Switch
a. Testing.
(1) Verify refrigerant pressure is above cut-
out pressure setting of 7 (±5) psig.
(2) Push reset button. If switch does not
reset, switch is defective and must be replaced.
(3) Check for continuity between terminals
of pressure switch. Continuity should be indi-
cated. If continuity is not indicated, the low-pres-
sure cutout switch is defective and must be re-
placed.
b. Removal
(1) Refer to figure 3-4 and remove front
and top access covers.
(2) Refer to figure 3-6 and remove fresh air
inlet screen.
(3) Discharge the refrigerant system (para
6-3).
(4) Refer to figure 3-10 and remove control
panel.
(5) Refer to figure 5-11 and remove the
low-pressure cutout switch.
c. Installation.
(1) Install the low-pressure cutout switch in
reverse order of removal.
(2) Pressure test, evacuate, and recharge
the refrigerant system (para 6-5).
5-21. Dehydrator
a. General The dehydrator removes moisture
and contaminants ‘from the refrigerant circuit.
The dehydrator must be replaced whenever the
system is opened for repairs.
b. Removal.
(1) Discharge the refrigerant system (para
6-5).
(2) Refer to figure 3-4 and remove the lower
front access cover.
(3) Refer to paragraph 3-30 and remove the
junction box.
(4) Refer to figure 5-12 and remove the de-
hydrator.
Figure 5-12. Dehydrator, removal and installation.
c. Installation.
(1) Install the dehydrator in reverse order
of removal.
(2) Pressure test, evacuate, and recharge the
refrigerant system (para 6-5).
5-22. Pressure Relief Valve
a. GeneraL The pressure relief valve is installed
in the system to relieve the refrigerant system
pressure in the event the high-pressure cutout
5-16
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