QUENCH THERMAL EXPANSION VALVE

TM 5-4120-369-14

QUENCH THERMAL EXPANSION VALVE - Continued.

5-26.

(1) Refer to paragraph 6-3 and discharge the refrigerant system.

(2) Refer to paragraph 4-18 and remove the top rear cover.

(3) Refer to figure 5-10. Soften the mastic in the bulb well and remove the expansion

valve bulb. Take care to avoid damaging the capillary tube.

(4) Remove the expansion valve clamp.

(5) Unsolder the expansion valve clamp.

Installation.

(1) Refer to figure 5-10 and mount the expansion valve against the compartment

wall using the mounting clamp.

Brazing operations should be carried out using approved

eye protection equipment and rods not containing cadmium.

Certain brazing operations may require mechanical ventilation.

Local preventive medicine personnel should be queried

if doubt exists as to rod composition or ventilation

requirements.

(2)

Solder the expansion valve to the refrigerant system tubing.

(3)

Refer to paragraph 6-3 and leak test the refrigerant system.

(4) Insert approximately one ounce of thermal mastic in bulb well. Insert sensing

bulb of expansion valve and move bulb back and forth to distribute mastic. Position bulb

approximately one inch beyond open end of bulb well.

(5)

Refer to paragraph 6-3 and purge the refrigeration system.

(6)

Refer to paragraph 4-18 and install top rear cover.

Caution should be exercised with fluorocarbon refrigerant

gas (freons) as they can displace oxygen and thereby cause

suffocation.

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 arrhythmias, as a result of exposure to

fluorocarbon refrigerant gases (freons). Such individuals

should be evaluated by local medical authorities before

working in environments where potential freon exposure

may occur.

(7)

Refer to paragraph 6-3 and charge refrigerant system.

5-28