Section 2
DESCRIPTION
10
Figure 2---2 Compressor Cooling a nd Lubrication System
droplets offluid separate andfall tothe bottom ofthe
sump. The fractional percentage of fluid remaining
in the compressed air collects on the surface of the
final separator element as the compressed airflows
through the separator. As more and more fluid col-
lects on the element surface, the fluid descends to
the bottom of the separator. A return line (or scav-
enge tube) leads from the bottom of the separator
element to the inlet region of the compressor unit.
Fluid collecting on the bottom of the separator ele-
ment is returned to the compressor by the pressure
difference between the area surrounding the sepa-
rator element and the compressor inlet. An orifice
(protected byastrainer) isincluded inthisreturn line
to assure proper flow.
Thesump isASMEcode ratedat175psig (12.1bar)
working pressure. A minimum pressure/check
valve, located downstream from the separator, as-
sures a minimum receiver pressure of 55 psig (3.8
bar) during all conditions. This pressure is neces-
sary for proper air/fluid separation and proper fluid
circulation.
Apressure reliefvalve (locatedonthewetside ofthe
separator) is set to open if the sump pressure ex-
ceeds 140 psig (9.7 bar) or 175 PSIG (12.1 bar) for
“
H
”
machines. A temperature switch will shut down
the compressor if the discharge temperature
reaches the specified limit given inSection 3, Speci-
fications.
Fluid is added to the sump via a capped fluid filler.
WARNING
!
DO NOT remove caps, plugs, and/or other compo-
nents when compressor is running or pressurized.
Stop compressor and relieve allinternalpressure be-
fore doing so.
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