Sullair LS-20 Operator's Manual And Parts List page 22

Section 5
COMPRESSOR SYSTEMS
Figure 5-3 Compressor Cooling, Lubrication and Discharge Systems Diagram
check valve preventing compressed air in the ser-
vice line from bleeding back into the receiver on
shutdown and during operation on the compressor
in an unloaded condition.
A pressure relief valve (located on the wet side of
the separator) is set to open if the sump pressure ex-
ceeds 200 psig (13.8 bar). For added safety the Su-
pervisor II module is programmed to shutdown the
16
package when:
a) A pressure level, above unload setting but be-
low relief valve setting, is reached.
b) A temperature level exceeding 240_F (116_C)
is reached.
See Supervisor II module functional description for
further details on shutdown pressure levels.