Sullair ShopTek ST1100, User Manual

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S
HOP
T
EK
™
USER MANUAL SECTION 6
68
02250180-090 R00
Compressor cannot produce
full discharge pressure
Air demand too high
Check service lines for leaks or open
valves.
Dirty air filter Replace filter.
Inlet valve bleed orifice
obstructed/plugged Check the control line bleed orifice inside
the inlet valve for blockage or obstructions.
Defective unload solenoid valve Check the valve - if it does not operate
when energized, replace the valve coil or
the entire valve if defective.
Minimum pressure valve
malfunction
Repair or replace minimum pressure valve
Pressure sensor malfunction Check connection and sensor – replace if
sensor is defective.
Belts slipping due to lack of
tension Ckeck belts. Re-tension or replace as
necessary.
Line pressure rises above
unload pressure set-point Control system leak causing loss
of pressure signals
Check for leaks.
Inlet valve stuck open Remove the intake hose and check the inlet
valve for proper operation.
Defective unload solenoid valve Check the valve for proper operation - open
when energized - replace if necessary
Plugged/obstructed control line
strainer
Clean or replace strainer
Pressure sensor malfunction
Check connection and sensor – replace if
sensor is defective.
High compressor fluid
consumption Clogged return line or orifice Clean or replace the strainer.
Separator element damaged or
malfunctioning
Change separator.
Lubrication system leak
Check all pipes, connections, and
components.
Excess fluid foaming Drain fluid and change.
Fluid level too high Drain and change - check that the
compressor temperature has not dropped
below 170ºF (76.7ºC).
Pressure relief valve opens
frequently Pressure relief valve defective Replace.
Plugged/obstructed separator Check separator differential.
Pressure sensor malfunction
Check connection and sensor - replace if
sensor is defective.
Table 6-3: Troubleshooting Guide
SYMPTOM PROBABLE CAUSE REMEDY