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Page Title: Section IV. LIQUID LINE SOLENOID VALVE AND EQUALIZER SOLENOID VALVE
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TM 5-4120-274-15
6-7. Low Pressure Switch
6-8. Fan Speed Pressure Switch
a Genenal. The low pressure switch prevents
a. General The fan speed switch changes the
the compressor from operating if the suction pres-
speed of the fan motor from low to high when
sure drops below 25 psig (pounds per square inch
the pressure reaches 425 psig (pounds per square
inch gage).
gage .
b. Removal. Refer to figure 3-13, and remove
b. Removal. Refer to figure 3-14, and remove
low pressure switch.
fan speed pressure switch.
c. Installation. Refer to figure 3-13, and install
c. Installation. Refer to figure 3-14, and in-
low pressure switch
stall fan speed pressure switch
Section IV. LIQUID LINE SOLENOID VALVE AND
EQUALIZER SOLENOID VALVE
c. Installation. Refer to figure 3-10, 3-11 and
6-9. Liquid Line Solenoid Valve
install equalizer solenoid valve (hot gas bypass
a. General The liquid line solenoid shuts off
solenid valve). Evacuate and recharge the re
flow of refrigerant to the evaporator coil when
frigeration system (para 5-21c and 5-21d).
the thermostat is satisfied
b. Removal Slow]y discharge refrigerant from
system ( para 5-21b). Refer to figure 3-6 and re-
move the liquid line solenoid valve.
c. Installation. Refer to figure 3-6 and install
the liquid line solenoid. Evacuate and recharge
refrigeration system (para 5-21c and 5-21d).
Caution: The solenoid valves must be dis
assembled before disconnecting the tubing from
the valve to avoid heat distortion. Refer to fig-
ure 6-1.
Caution: Solder the tubing to the body of
the valve before reassembling the valve to avoid
heat distortion. Refer to figure 6-1.
6-10. Equalizer Solenoid Valve (hot gas
solenoid valve)
a. General. The equalizer solenoid valve (hot
gas solenoid valve) actuated by the on-off switch
and serrves to equalize system pressures during
shutdown.
b.  Removal.  slowly  refrigerant
from
system (para 5-21b). Refer to figure 3-10, 3-11
and remove the equalizer solenoid valve (hot gas
bypass solenoid valve).
Figure 6-1 Solenoid valve, disassembly and reassembly.
Section V. PRESSURE RELIEF VALVE
system (pare 5-21b). Refer to figure 3-6 and re
6-11. Pressure Relief Valve
move pressure relief valve.
a. General. The pressure relief valve protects
c. Installation. Refer to figure 3-6, and install
the refrigerant system from excessive pressure.
pressure relief valve. Evacuate (para 5-21c) and
b. Removal. Slowly discharge refrigerant from
recharge (para 5-21d the refrigeration system.

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