Section 5
OPERATION
17
5.1 GENERAL
While Sullair has built into this compressor a com-
prehensive array of controls, protective devices
and indicators to assure 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 malfunction. Before starting your
Sullair compressor, read this section thoroughly
andfamiliarizeyourself withthecontrols, protective
devices 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
230ºF (110ºC ).
BEARING FLUID FILTER MAINTENANCE Indicates when a bearing fluid filter element change
INDICATOR is 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 sepa-
rator elements is excessive. The separators must be
replaced. DO NOT CLEAN.
FLUID LEVEL SIGHT GLASS Monitors fluidlevel in the sump. Proper levelis to fill the
sight glass.
FLUID RETURN LINE SIG HT GLASSES Used to indicate fluid flow in the return lines. When the
compressor is running at full load, fluid flow should be
visible in this sight glasses. There may be little or no
flow when the compressor is running unloaded, but a
sluggish flow at full load indicates a need to clean the
return line strainers.
FLUID STOP VALVE Cuts off flow of fluid to compressor unit at compressor
shutdown and allows flow of fluid to unit on start-up.
COMPRESSOR 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 an operating compressor discharge
temperature of 230ºF (110ºC ). Used for fast warmup
on start-up.
HIGH PRESSURE SHUTDOWN SWITCH Designed to shut down the compressor when thepres-
sure becomes too high. This switch is set for 365 psig
(25.2 bar).
PRESSURE RELIEF VALVE (Sump) Opens sump pressure to the atmosphere should pres-
sure inside the sump become too high (375 psig [25.9
bar]).
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