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TM 10-4130-239-14
5-7.
REFRIGERATION SYSTEM SERVICE - EVACUATION (CONT)
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CAUTION
DO NOT operate compressor until directed to do so
in the charging procedure.
NEVER run the system
without refrigerant.
Open both service manifold valves to show pressures on gauges.
Start vacuum Pump.
Open evacuation manifold valve.
Vacuum gauge
will drop rapidly
approaching 29-30
After a vacuum of
manifold valves.
at first then more slowly but steadily
inches Hg.
28 in. Hg. is achieved, close all service
Turn off vacuum pump.
Open charging manifold valve (hose
suction service manifold valve and
gauge readings reach O psi.
Close
from refrigerant tank) and
watch gauges.
Stop flow when
charging manifold valve.
Start vacuum pump.
Open evacuation manifold valve.
Vacuum gauge
will drop rapidly at first then more slowly but steadily
approaching 29-30 inches Hg.
After a vacuum of 28 in. Hg. is achieved, close all service
manifold valves.
Turn off vacuum pump.
Open charging manifold valve (hose from refrigerant tank) and
suction service manifold valve and watch gauges.
Stop flow when
gauge readings reach O psi.
Close charging manifold valve.
Start vacuum pump.
Vacuum gauge will drop rapidly at first then
more slowly but steadily approaching 29-30 inches Hg.
After a vacuum of 28 in. Hg. is achieved, close all service
manifold valves.
Turn off vacuum pump.
Open refrigerant valve and suction service manifold valve and
watch gauges.
Stop flow when gauge readings reach O psi.
Start vacuum pump.
Vacuum gauge will drop rapidly at first then
more slowly but steadily approaching 29-30 inches Hg.
5-15
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