SECTION 6 4500P-7500 USER MANUAL
63
TABLE 6-1: TROUBLE SHOOTING GUIDE (CONTINUED)
SYMPTOM PROBABLE CAUSE REMEDY
Compressor shuts down under
service load conditions
(continued)
WS Controller indicates separator
requires maintenance
Replace separator.
Compressor pressure setting
incorrect
Reprogram using WSPC equipped laptop.
Defective Regulator Valve Regulator may be defective - repair it if the
inlet valve does not close when the
pressure switch contacts open.
Defective blowdown valve Blowdown valve should exhaust receiver
tank pressure to 14 psig (1.0 bar) at
maximum operating pressure - repair the
regulator if defective.
Insufficient cooling water flow Check water lines and valves (water-cooled
models only).
Cooler obstructed/plugged Clean tubes - if obstruction persists, install a
water conditioner (water-cooled only).
Cooling air flow restricted
Clean cooler and check for proper
ventilation.
Ambient temperature too high Check ventilation and increase if too low.
Low fluid level Add fluid.
Clogged filter Change the fluid filter element.
Thermal valve malfunction Replace element.
Water flow regulating valve
malfunction
Change valve (water-cooled only).
Compressor cannot produce full
discharge pressure
Air demand too high
Check service lines for leaks or open
valves.
Dirty air filter Check the filter indicator and inspect, and/or
change the element if required.
Inlet valve bleed orifice obstructed/
plugged
Check the control line bleed orifice inside
the inlet valve for blockage or obstructions.
Pressure regulator out of
adjustment
Adjust the regulator (see adjustment
instructions in the Maintenance Section of
this manual).
Defective pressure regulator Replace regulator.
Defective unload solenoid valve Check the valve - if it does not operate
when energized, replace the valve coil or
the entire valve if defective.
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
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