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Figure 4-81. Expansion Valve (Quench)
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TM-5-4120-359-14 Air Conditioner Split Package 18 000 BTU/HR Cooling 30 000 BTU/HR Heating 208 Volt 3 Phase 400 Hertz Manual
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Figure 4-82. Discharge Bypass Valve
TM 5-4120-359-14
(5) Using screwdriver and wrench, remove the screw, lock washer and clamps that secure expansion valve and
coiled capillary to the bracket.
(6) Discharge the refrigerant system per paragraph 4-5.
(7) Wrap wet rags around expansion valve body, if it is to be reinstalled.
(8) While purging the system with nitrogen, debraze the tubing. (See paragraphs 4-6 and 4-7.)
(9) Remove expansion valve from unit.
d. Installation
(1) Position expansion valve in unit.
(2) Wrap wet rags around expansion valve body.
(3) While purging the system with nitrogen, braze the tubing joints. (See paragraphs 4-6 and 4-7.)
(4) Replace the dehydrator. (See paragraph 4-73.)
(5) Slip sensing bulb into its mounting bulb straps. Be sure bulb is centered on top of compressor inlet suction
line and tighten two nuts and screws. Be sure sensing bulb is making good metal-to-metal contact with compressor inlet
suction line.
(6) Using screwdriver and wrench, secure the capillary line from the sensing bulb to the refrigeration piping with a
screw, locknut, and clamps.
(7) Coil excess capillary tubing above expansion valve.
(8) Secure excess capillary tubing and expansion valve to bracket with screw, lock washer, and clamps.
(9) Leak test all newly connected joints and those in the repair area. (See paragraph 4-8.)
(10) Evacuate and charge the refrigerant system. (See paragraphs 4-9 and 4-10.)
(11) Replace the insulation tape that was removed from the sensing bulb and expansion valve connections. Use
insulation tape, item 14, Appendix E. Apply in spiral with overlapping edges.
Follow-on Procedures: 1. Install left end condenser cover. (See paragraph 3-27.)
2. Install right end condenser cover. (See paragraph 3-26.)
3. Install air conditioner on shelter. (See paragraph 3-6)
4. Connect power.
4-78. DISCHARGE BYPASS VALVE
Preliminary Procedure:
1. Remove condenser section electrical module assembly. (See paragraph 4-90.)
a. Adjustment/Test
(1) Valves are factory set to start opening when suction pressure decreases to 58 psig. Do not adjust unless you
are sure adjustment is necessary.
(2) Using screwdriver, remove eight screws from condenser section electrical module assembly.
4-162

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