ARMY TM 9-4120-380-14
NAVY EE-000-BA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-21
5.14. EVACUATING REFRIGERANT SYSTEM. Continued
SERVICE - continued
NOTE
The refrigeration system must be evacuated to remove all moisture before it is charged
with refrigerant R-22. Check that system was leak tested and has NO LEAKS
If compressor was replaced as result of a burnout, check that compressor burnout
a.
b.
Check that both charging manifold valves are closed
c.
Remove yellow 3/8-inch (0.95 cm) hose from hose rack and connect to vacuum pump
d.
Remove 1/4-inch (0.64 cm) yellow hose from hose rack and connect to R-22 refrigerant cylinder positioned for
dispensing gas.
e. Open R-22 refrigerant cylinder. Loosen 1/4 inch (0.64 cm) yellow hose at charge port and purge for 3-5
seconds, then tighten.
f. Open VPU CGV, and PGV.
g. Start vacuum pump end open ballast valve (on vacuum pump) one turn.
h. Observe vacuum pump gauge for a reading of 29-30 inches of Hg,
i. Close VPV and open CV and add refrigerant until compound and pressure gauges read approximately and 2
psig (4.41 kg), then clove CV.
j. Stop vacuum pump and close ballast valve.
k. Allow refrigerant to remain in system for 1 hour.
NOTE
Refrigerant will act as a blotter for moisture. One hour is recommended time for
maximum moisture removal. Shorter blotting period can be used if it is known that
system is relatively dry.
l.
Open VPV.
m.
Repeat Steps g through k.
n.
Open VPV.
o.
Repeat Steps j and k.
p.
Close VPV and CGV.
q.
Stop vacuum pump.
r.
Disconnect hose from vacuum pump and return it to racks. Charge refrigeration system (paragraph 5.15).
5-23