TM 9-4120-407-14
4-17. EVACUATING THE REFRIGERANT SYSTEM.
This task covers:
Evacuate
Tools
Equipment Conditions:
Refrigeration Unit Service Tool Kit
Evacuate.
(1) Check that new refrigerant desiccant dehydrator was installed. If not, install one. See
(2) Check that service manifold charge valve is closed.
Figure 4-9. Evacuation of Refrigerant System
(3) Check that Air Conditioner discharge and suction service valves are open.
(4) Connect the vacuum hose to vacuum pump.
(5) Start vacuum pump.
(6) Open service manifold high pressure gauge, compound gauge, and vacuum valves.
(7) Run vacuum pump until at least 29 inches of mercury is measured on compound gauge.
4-40