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

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Section 5
OPERATION
17
5.1 GENERAL
While Sullair has built into this compressor a com-
prehensive array of controls and indicators to as-
sure you that it is operating properly, you will want
to recognize and interpret the reading which will call
for service or indicate the beginning of a malfunc-
tion. Before starting your Sullair compressor, read
this section thoroughly and familiarize yourself with
the controls and indicators -- their purpose, location
and use.
5.2 PURPOSE OF CONTROLS
CONTROL OR INDICATOR PURPOSE
START PUSHBUTTON Depress to turn the compressor ON.
HOURMETER Records the cumulative hours of compressor opera-
tion; useful for planning and logging service sched-
ules.
LINE PRESSURE GAUGE Continually monitors service line air pressure. Located
on dry side of receiver downstream from check valve.
SUMP PRESSURE GAUGE Continually monitors receiver/sump pressure at vari-
ous load and/or unloaded conditions.
DISCHARGE TEMPERATURE GAUGE Monitors temperature of the air leaving the compres-
sor unit. The normal reading should be approximately
230
_
F (110
_
C ).
BEARING FILTER MAINTENANCE Indicates when a bearing filter element change is
INDICATOR required. Shows red when the pressure drop
through the filter is excessive.
SEPARATOR MAINTENANCE INDICATOR Indicates when separator element change is required.
Shows red when the pressure drop through the filter is
excessive. The separator must be replaced. DO NOT
CLEAN.
FLUID LEVEL SIGHT GLASS Monitors fluid level in the sump. Proper level is to fill the
sight glass.
FLUID RETURN LINE SIGHT GLASS Used to indicate fluid flow in the return line. When the
compressor is running at full load, fluid flow should be
visible in this sight glass. There may be little or no flow
when the compressor is running unloaded, but a slug-
gish flow at full load indicates a need to clean the return
line strainer.
FLUID STOP VALVE Cuts off flow of fluid to compressor unit at compressor
shutdown, and allows flow of fluid to unit on start--up.
DISCHARGE CHECK VALVE Cuts off the reverse flow of air/fluid mixture through
compressor discharge system at compressor shut-
down.
THERMAL VALVE Regulates flow of fluid to and around the cooler. De-
signed to maintain a maximum operating compressor
discharge temperature of 230
_
F (110
_
C ). Used for
fast warmup on start--up.
HIGH PRESSURE SHUTDOWN SWITCH Designed to shut down the compressor when the pres-
sure becomes too high. This switch is set for 365 PSIG
(2515kPa).