Section IV. LIQUID LINE SOLENOID VALVE AND EQUALIZER SOLENOID VALVE

TM 5-4120-273-15

(2) Refer to figure 3-14 and remove the low

(2) Refer to figure 3-14 and remove the

pressure switch from the pressure switch mount-

high pressure switch from the pressure switch

ing box.

mounting box.

(3) Disconnect flare nut from low pressure

(3) Disconnect flare nut from high pressure

line connection and immediately cap to prevent

refrigerant loss.

c. Installation.

(1) Refer to figure 3-14 and install the low

(1) Refer to figure 3-14 and install the high

pressure switch.

pressure switch,

(2) Connect flare nut to low pressure con-

(2) Connect flare nut to high pressure con-

nection.

(3) Install top panel, condenser fan and fan

guard, refer to paragraph 3-18 and 3-20.

6-8. Fan Speed Pressure Switch

6-7. Low Pressure Switch

a. General. The fan speed switch changes the

a. General. The low pressure switch prevents

speed of the fan motor from low to high when the

the compressor from operating if the suction

pressure reaches 410 psig.

pressure drops below 25 psig.

b. Removal. Refer to figure 3-15 and remove

b. Removal.

fan speed pressure switch.

(1) Remove top panel, condenser fan guard,

c. Installation. Refer to figure 3-15 and install

fan speed pressure switch.

condenser fan, refer to paragraph 3-18 and 3-20.

Section IV. LIQUID LINE SOLENOID VALVE AND EQUALIZER

SOLENOID VALVE

Caution: Solder the tubing to the body of

6-9. Liquid Line Solenoid Valve

valve before reassembling valve to avoid heat

a. General. The liquid line solenoid shuts off

distortion (fig. 6-1).

the flow of refrigerant to the evaporator coil when

the thermostat is satisfied.

6-10. Equalizer Solenoid Valve

b. Removal. Slowly discharge refrigerant from

a. General. The equalizer solenoid valve is

system (para 5-21b). Refer to figure 3-6 and re-

actuated by the on-off switch and serves to equal-

move solenoid valves.

ize system pressures during shutdown.

b. Removal Slowly discharge refrigerant from

c. Installation. Refer to figure 3-6 and install

system (para 5-21c). Refer to figures 3-11, 3-12

solenoid valves.

and remove equalizer solenoid valve,

Caution: The solenoid valves must be dis-

c. Installation. Refer to figures 3-11, 3-12 and

assembled before disconnecting the tubing from

install equalizer solenoid valve. Evacuate and re-

the valve to avoid heat distortion. Refer to fig-

charge the refrigerant system (para 5-21c and 5-

ure 6-1.

21d).

6-2