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TM 9-4120-389-14
(7)
Compare the saturation temperature with indicated temperature. The indicated temperature
should be 16 + .5 deg. F (8.9 + .3 deg. C) higher than the saturation temperature. For example: With a 40
deg. saturation temperature, the thermometer should read 65 + 5 deg. F (18 + 2.7 deg. F). If indicated
temperature is not within above limits, quench valve is not functioning properly and must be replaced.
c.
Removal
WARNING
All refrigerant -22 must be discharged from system before attempting to remove
liquid quench expansion valve.
(1)
Discharge the refrigerant system per paragraph 5-3.
(2)
Unwrap insulation from suction line to expose sensing bulb.
(3)
Loosen three flare nutsthat secure tubing to quench valve.
(4)
Remove screw, lockwasher and nut from clamp.
(5)
Remove two screws and nuts from clamps that secure the sensing bulb. Discard clamps.
(6)
Note position of bulb on suction line.
(7)
Remove quench valve from clamp.
d.
Installation
(1)
Install quench valve in clamp.
(2)
Tighten three flare nuts on the quench valve.
(3)
Secure quench valve to clamp with screw, lockwasher and nut.
(4)
Coil sensing bulb capillary in two loops.
(5)
Noting position, place the thermo bulb on suction line.
(6)
Secure thermo bulb to suction line with two clamps supplied with valve, with two screws and
two nuts (also supplied with valve).
(7)
Wrap bulb and capillary with tape. (Item 29, Appendix E).
(8)
Replace the dehydrator (See para. 5-10).
(9)
Leak check all newly connected joints and those in the repair area (See para. 5-6).
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