Sullair 1800 User Manual page 66

1800-3000 USER MANUAL
SYMPTOM
Compressor Shuts Down With Air
Demand Present
Compressor Will Not Build Full Dis-
charge Pressure
66
PROBABLY CAUSE
Loss of Control Voltage
Low Incoming Voltage
Excessive Operating Pressure
Separator Requires Maintenance
High Pressure Setting in WS Con-
troller Set Wrong
Defective Unload Solenoid Valve
Defective Blowdown Valve
High Discharge Temperature
Cooling Air Flow Restricted
Ambient Temperature Is Too High
Low Fluid Level
Thermal Valve Not Functioning
Properly
Air Demand Is Too Great
Dirty Air Filter
Inlet Valve Bleed Orifice Plugged
Pressure Regulator Out of Adjust-
ment
Defective Pressure Regulator
Defective Unload Solenoid Valve
Sheared Coupling Element
REMEDY
Reset. If trouble persists, check that line
pressure does not exceed maximum oper-
ating pressure of the compressor (specified
on nameplate).
Consult power company.
—
Check maintenance indicator under full load
conditions.
Reset.
WS Controller will energize valve to close.
Repair if defective.
Blowdown valve should exhaust separator/
sump tank pressure to 18 psig (1.2 bar)
when maximum operating pressure is
reached. Repair if defective.
—
Clean cooler and check for proper ventila-
tion.
Provide sufficient ventilation.
Add fluid.
Replace element.
Check service lines for leaks or open
valves.
Check the filter indicator and inspect and/or
change element if required.
Ensure control line bleed orifice located in
assembly on top of air end is not plugged.
Adjust regulator according to control
adjustment instructions in the Maintenance
.
Check diaphragm and replace if necessary
(kit available).
Check that the valve closes when
energized. Replace the coil or the complete
valve if defective.
Replace coupling element. Refer to Shaft
Coupling Maintenance on page 65.
SECTION 6