General; Purpose Of Controls - Sullair 20/12 Series Operator's Manual And Parts List

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

5.2 PURPOSE OF CONTROLS

CONTROL OR INDICATOR
START PUSHBUTTON
HOURMETER
LINE PRESSURE GAUGE
SUMP PRESSURE GAUGE
DISCHARGE TEMPERATURE GAUGE
BEARING FILTER MAINTENANCE
INDICATOR
SEPARATOR MAINTENANCE INDICATOR
FLUID LEVEL SIGHT GLASS
FLUID RETURN LINE SIGHT GLASS
FLUID STOP VALVE
DISCHARGE CHECK VALVE
THERMAL VALVE
HIGH PRESSURE SHUTDOWN SWITCH
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.
PURPOSE
Depress to turn the compressor ON.
Records the cumulative hours of compressor opera-
tion; useful for planning and logging service sched-
ules.
Continually monitors service line air pressure. Located
on dry side of receiver downstream from check valve.
Continually monitors receiver/sump pressure at vari-
ous load and/or unloaded conditions.
Monitors temperature of the air leaving the compres-
sor unit. The normal reading should be approximately
230_F (110_C ).
Indicates when a bearing filter element change is
required. Shows red when the pressure drop
through the filter is excessive.
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.
Monitors fluid level in the sump. Proper level is to fill the
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.
Cuts off flow of fluid to compressor unit at compressor
shutdown, and allows flow of fluid to unit on start--up.
Cuts off the reverse flow of air/fluid mixture through
compressor discharge system at compressor shut-
down.
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.
Designed to shut down the compressor when the pres-
sure becomes too high. This switch is set for 365 PSIG
(2515kPa).
Section 5
OPERATION
17