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Page Title:
EXPANSION VALVE (PRIMARY). (Cont) |
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 TM5-4120-383-14
EXPANSION VALVE (PRIMARY). - Continued
5-21.
(4) Replace dehydrator. (See para 5-30.)
(5) Leak test all newly connected joints and all tube
connections in the area.
(6) Rewrap insulation at expansion valve joints.
(7) Install sensing bulb in bulb well.
(a) Insert approximately one ounce of thermal mastic in
bulb well.
(b) Insert sensing bulb from expansion valve into bulb
well.
(c) Move bulb back and forth to distribute the mastic.
(d) Set bulb about one inch (2.5 cm) beyond open end of
bulb well.
(8) Install top cover (para 4-11).
(9) Evacuate and charge the refrigeration system in
accordance with paragraphs 5-15 and 5-16.
5-22.
EXPANSION VALVE (QUENCH).
The liquid quench expansion valve is factory set at a superheat of
Do not
16 1/2F (8.9 0.3C) at 32F (0C) bath temperature.
attempt field adjustment of this valve.
a.
Removal.
(See fig. 5-11.)
(1) Disconnect power at power source.
(2) Remove top rear cover (para 4-11).
(3) Discharge and purge refrigeration system per paragraphs
5-11 and 5-12.
(4) Unwrap insulation from joints of the expansion valve.
(5) Soften the thermal mastic in bulb well using a cloth
wrung out in hot water, a heat lamp, or heat gun if necessary and
withdraw the bulb from the well.
5-50
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