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

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

5.2 PURPOSE OF CONTROLS

CONTROL OR INDICATOR
START PUSHBUTTON
HOURMETER
LINE PRESSURE GAUGE
SUMP PRESSURE GAUGE
DISCHARGE TEMPERATURE GAUGE
BEARING FLUID FILTER MAINTENANCE
INDICATOR
SEPARATOR MAINTENANCE INDICATOR
FLUID LEVEL SIGHT GLASS
FLUID RETURN LINE SIGHT GLASSES
FLUID STOP VALVE
COMPRESSOR DISCHARGE CHECK VALVE
THERMAL VALVE
HIGH PRESSURE SHUTDOWN SWITCH
PRESSURE RELIEF VALVE (Sump)
beginning of a malfunction. Before starting your
Sullair compressor, read this section thoroughly
and familiarize yourself with the controls, protective
devices 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
230ºF (110ºC ).
Indicates when a bearing fluid 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 sepa-
rator elements is excessive. The separators 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 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.
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 an operating compressor discharge
temperature of 230ºF (110ºC ). 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
(25.2 bar).
Opens sump pressure to the atmosphere should pres-
sure inside the sump become too high (375 psig [25.9
bar]).
Section 5
OPERATION
17