Section 4
OPERATION
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4.1 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 wa nt
to recognize and interpret the reading which will
call for service or indicate the beginning of a mal-
function. Before starting your Sullair compressor,
read this section thoroughly a nd familiarize your-
self with the controls and indicators - their purpose,
location and use.
4.2 PURPOSE OF CONTROLS
CONTROL OR INDICATOR PURPOSE
START PUSHBUTTON Depress to turn the compressor ON.
STOP PUSHBUTTON Depress to turn the compressor OFF.
HOURMETER Records cumulative hours of compressor operation;
useful for planning and logging service schedules.
LINE PRESSURE GAUGE Continually monitors service line a ir pressure. Lo-
cated 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 a ir leaving the compres-
sor unit. F or both air and water-cooled compressors,
the normal reading should be approximately 180 _Fto
190_F to 205_F.
BEARING FILTER MAINTENANCE INDICATOR Indicates w hen a bearing filter element change is re-
quired. Shows red w hen pressure drop through the
filter is excessive.
SEPARATOR MAINTENANCE INDICATOR Indicates when separator element change is re-
quired. Shows red w hen pressure drop through the
separator is excessive. The separator must be re-
placed. D o not clean the separator elements.
COOLANT LEVEL SIGHT GLASS Monitors 24KT coolant level in the sump. Proper level
is to fall between the FULL and ADD marks located on
the side of the sight glass. Check the level when the
machine is shut down. DO NOT OVERFILL.
SEPARA TOR RETURN LINE SIGHT GLASS Used to indicate fluid flow in the return line. When the
compressor is running at full load, coolant flow should
be visible in this sight glass. There may be little or no
flow when the compressor is running unloaded, but a
sluggish flow from the primary return line at full load
indicates a need to clean the return line strainer. There
should be little or no flow through the secondary re-
turn line.
FLOW CONTROL VALVE Cuts off flow of fluid to compressor unit at machine
shutdown and a llows flow of fluid to the 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 minimum operating temperature
of 170_F; used for fast warm-up on start-up.
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