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TM 55-1905-220-14-9
4-36. MISCELLANEOUS VALVES AND HEADERS - MAINTENANCE INSTRUCTIONS.
a. Pumping down to replace liquid solenoid valve proceed as follows:
(1) Close the cut-out valve on inlet side of strainer, and operate system to pump down.
(2) As the pressure is reduced, the strainer will become cold and then begin to warm up as soon as
liquid refrigerant has been removed.
(3) Close the cut-out valve on the outlet side (downstream of thermal expansion valve).
(4) Remove liquid line solenoid in accordance with standard soldering methods.
(5) Plug openings to exclude air and moisture.
(6) Install liquid line solenoid.
(7) Loosen strainer cover.
(8) Open cut-out valves on both sides of strainer one at a time and allow a small quantity of refrigerant
to blow the air out of the line .
(9) Quickly tighten strainer cover.
(10) Open cut-out valves.
(11) Resume normal operation.
b. The following is an index to the maintenance procedures:
DESCRIPTION
PARAGRAPH
Liquid Solenoid Valve
4-36.1
Receiver
4-36.2
Heat Interchanger
4-36.3
Water Regulating Valve
4-36.4
Thermometers
4-36.5
Refrigerant Tubing
4-36.6
Packless Valves
4-36.7
Controller
4-36.8
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