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figure 5-10. primary thermal expansion valve, removal and installation
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TM-5-4120-361-14 Air Conditioner Vertical Compact 18 000 BTU/HR 208 Volts 3 Phase 50/60 Hz (Model 18K 208 3 60) Manual
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Figure  5-11. Quench thermal expansion valve and fluid pressure regulator, removal and installation
TM 5-4120-361-14 b. Removal. 1. Caution should be exer- cised with fluorocarbon re- frigerant gas (freons) as they can displace oxygen and there- by cause suffocation. 2. 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 arryth- mias, as a result of exposure to  fluorocarbon  refrigerant gases (freons). Such indivi- duals should be evaluated by local medical authorities be- fore working in environments where potential freon exposure may occur. (1) Refer to figure 6-1 and dis- charge the refrigerant system. (2) Refer to figure 4-4 and remove the top front 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 from the refrigerant system tubing. c. Installation. (1) Refer to figure 5-10 and mount the expansion valve against the compart- ment wall using the mounting clamp. 1. Brazing  operations  should be carried out using approved eye protection equipment and rods not containing cadmium. 2. Certain  brazing  operations may require mechanical venti- lation. 3. Local preventive medicine personnel should be queried if doubt exists as to rod compo- sition or ventilation require- ments. (2) Solder the expansion valve to the refrigerant system tubing. (3) Refer to para 5-6 and leak test the refrigeration 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 figure 6-1 the refrigerant system. (6) Refer to figure 4-4 stall top front cover. and purge and in- 1. Caution should be exer- cised with fluorocarbon refrigerant gas (freons) as they can displace oxygen and thereby cause suffocation. 2. 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 arryth- mias, as a result of exposure to  fluorocarbon  refrigerant gases (freons). Such indivi- duals should be evaluated by local medical authorities be- fore working in environments where  potential  freon  exposure may occur. (7) Refer to figure 6-2 and charge refrigerant  system. - 5-30. Quench Thermal Expansion Valve. a. General. The quench thermal ex- pansion.  valve  is  hermetically  sealed  and cannot be repaired. 5-25

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