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TM 9-4120-389-14
WARNING
All refrigerant -22 must be discharged from system before attempting removal of
pressure regulating valve.
(1)
Discharge the refrigerant system per para. 5-3.
(2)
Purge the system per para. 5-4.
(3)
Puncture small hole in valve housing to relieve internal pressure.
(4)
Debraze the tube connections per para. 5-5.
(5)
Remove two screws, lockwashers and two nuts on the two clamps that secure the valve.
(6)
Remove the pressure regulating valve.
c.
Installation
(1)
Install the hot gas bypass valve in two clamps.
(2)
Assemble valve on tube ends.
(3)
Purge the system with nitrogen per para. 5-4.
(4)
Braze the tube connections per para. 5-5.
(5)
Install two screws, lockwashers and nuts in two clamps.
(6)
Replace the dehydrator per para. 5-10.
(7)
Leak test all newly connected joints and those in the repair area per para. 5-6.
(8)
Evacuate the system per para. 5-6.
(9)
Charge the system per para. 5-8.
Follow-on procedure: Install top cover (See para. 4-14).
5-47
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