Figure 5-3. Thermostatic expansion valves, removal and installation.

Figure 5-3. Thermostatic expansion valves, removal and installation.

c. Removal.

tor to prevent evaporator freeze up. It also by-

passes refrigerant gas from the discharge line to

(1) Remove top cover from unit.

the suction line during bypass operation when the

(2) Discharge refrigerant (para 6-1).

switch is on COOL. The valve is preset to estab-

(3) Refer to figure 5-2 and remove the back

lish a minimum pressure of 57.8 PSIG in the eva-

pressure regulating valve.

d. Installation.

porator.

b. Adjustment.

(1) Install the back pressure regulating

valve and top cover by reversing the order of re-

(1) Remove the button plug from the cap at

moval.

top of valve.

(2) Attach a service gage to read suction

(2) Replace the dehydrator (para 5-18).

pressure.Turn screw clockwise to raise pressure

(3) Evacuate and recharge the refrigerant

and counterclockwise to reduce pressure.

5-6