Sullair 20/12 500 CFM, Operator'S Manual And Parts List

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Section 2
DESCRIPTION
7
Figure 2-2 Compressor Cooling and Lubrication System
fice (protected by a strainer) is inserted in the return
line to assure proper flow.
The sump is ASME code rated at 400 PSIG
(2756kPa) working pressure. A minimum pressure
valve, located downstream from the separator, as-
sures a minimum receiver pressure of 160 PSIG
(1103kPa), which is maintained during all condi-
tions. This pressure is necessary for proper fluid cir-
culation and air/fluid separation.
A pressure relief valve (located on the wet side of
the separator) is set to open if the sump pressure ex-
ceeds 375 PSIG (2584kPa). Also a temperature
switch will shut down the compressor when the dis-
charge temperature reaches 265
_
F (130
_
C) on first
stage or 265
_
F (130
_
C) on second stage.
All Sullair compressor models are equipped with a
high pressure shutdown switch to shut down the
compressor at 365 PSIG (2515kPa). This prevents
the pressure relief valve from opening under routine
conditions, thereby preventing fluid loss through the
pressure relief valve.
Fluid is added to the sump via a capped fluid filler
opening, placed low on the tank to prevent overfil-
ling. A sight glass enables the operator to visually
monitor the sump fluid level.
WARNING
!
DO NOT open the fluid filler cap when the com-
pressor is pressurized. Shut down the compres-
sor and bleed the sump to 0 PSIG before remov-
ing the cap.
A check valve is also provided to prevent air in the
service line from bleeding back into the sump at
shutdown or when the compressor is being run in