TM 10-8145-222-23
0014
SERVICE CONTINUED
11. Close compressor discharge service valve (Figure 1, Item 2) by turning counterclockwise.
12. Open two vacuum gauge manifold valves by turning clockwise.
13. Open vacuum pump manifold valve.
NOTE
Steps 14 and 15 are performed to test the evacuation setup for leaks. If the vacuum
holds, the setup has no leaks and it is okay to proceed with step 14. If the vacuum
does not hold, there is a leak, or leaks, in the setup that will have to be repaired
before continuing with the evacuation and dehydration procedure.
A deep vacuum is defined as 500 microns or more with a tolerance of +1/-0 while
being held in that state for a minimum of 30-minutes.
14. Start vacuum pump and draw a deep vacuum (500 +1/-0 microns).
15. Shut off vacuum pump and make sure vacuum holds for 30-minutes.
16. Open compressor suction service (Figure 1, Item 1) valve by turning clockwise.
17. Open compressor discharge service (Figure 1, Item 2) valve by turning clockwise.
18. Open receiver valve by turning clockwise.
19. Open two vacuum gauge manifold valves by turning clockwise, if not already open.
20. Open vacuum pump manifold valve by turning clockwise, if not already open.
21. Start vacuum pump to start evacuation of refrigerant in system.
22. Evacuate refrigeration unit until vacuum gauge indicates 2,000 ( 25) microns.
23. Close two vacuum gauge manifold valves by turning counterclockwise.
24. Close vacuum pump manifold valve by turning counterclockwise.
25. Turn off vacuum pump.
26. Wait three to five minutes and observe that vacuum holds. If vacuum does not hold, perform a leak check. It
could be an indication that there is still moisture in the system or a leak.
27. Break vacuum with clean, dry refrigerant.
28. Raise system pressure to approximately 2 psig.
29. Remove refrigerant using refrigerant reclaimer.
30. Repeat steps 16 through 26 one time.
31. Start vacuum pump.
0014-13
