6.10 TROUBLESHOOTING GUIDE (CONTINUED)
SYMPTOM PROBABLE CAUSE REMEDY
Compressor Will Not Build Full Discharge
Pressure
Air Demand is Too Great Check service lines for leaks or open valves.
Dirty Air Filter Check the filter indicator and inspect and/or
change element if required.
Inlet Valve Bleed Orifice Plugged Ensure control line bleed orifice located
inside inlet valve is not plugged.
Pressure Regulator Out of Adjustment Adjust regulator according to control
adjustment instructions in the Maintenance
section.
Defective Pressure Regulator Replace regulator.
Defective Unload Solenoid Valve Check that the valve closes when
energized. Replace the coil or the complete
valve if defective.
Line Pressure Rises Above Unload
Pressure Set-Point
Leak in Control System Causing Loss of
Pressure Signals
Check for leaks.
Inlet Valve Stuck Open Remove the intake hose and check for inlet
valve operation.
Defective Unload Solenoid Valve Check that the valve is open when de-
energized. Replace if necessary.
Plugged Control Line Strainer Clean strainer (screen and O-ring
replacement kit available).
Defective Blowdown Valve Check that receiver tank pressure is
exhausted to the atmosphere when the
solenoid valve opens. Repair or replace if
necessary (kit available).
Excessive Compressor Fluid Consumption
Clogged Return Line or Orifice Clean strainer (screen and O-ring
replacement kit available).
Clean orifice.
Separator Element Damaged or Not
Functioning Properly
Change separator.
Leak in the Lubrication System Check all pipes, connections and
components.
Excess Fluid Foaming Drain and change.
Fluid Level Too High Drain and change. Check that the
compressor temperature has not dropped
below 170°F
(76.7°C).
Pressure Relief Valve Opens Repeatedly Defective Pressure Relief Valve Replace.
Plugged Separator Check separator differential.
MAINTENANCE
®SULLAIR®
3000-4500 Operator’s Manual and Parts List
67
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