SECTION 6
®SULLAIR®
38
3700 Operator’s Manual and Parts List
6.10 TROUBLESHOOTING GUIDE
SYMPTOM PROBABLE CAUSE REMEDY
COMPRESSOR WILL NOT START Main Disconnect Switch Open Close switch.
Line Fuse Blown Replace fuse.
Motor Starter Overload Tripped Reset. Should trouble persist, check
whether motor starter contacts are
functioning properly.
Low Incoming Line Voltage Check voltage. Should voltage check low,
consult power company.
COMPRESSOR SHUTS DOWN WITH
AIR DEMAND PRESENT
Loss of Control Voltage Reset. If trouble persists, check that line
pressure does not exceed maximum
operating pressure of the compressor
(specified on nameplate).
Low Incoming Voltage Consult power company.
Excessive Operating Pressure Separator requires maintenance; check
maintenance indicator under full load
conditions.
High pressure setting in microprocessor
set wrong; reset.
Defective valve; regulator valve should
cause inlet valve to close when the
pressure switch contacts open. Repair if
defective.
Defective blowdown valve; blowdown
valve should exhaust sump pressure to
25 psig (1.7 bar) when maximum
operating pressure is reached. Repair if
defective.
Discharge Temperature Switch Open Cooling water temperature too high;
increase water flow (water-cooled only).
Cooling water flow insufficient; check
water lines and valves (water-cooled
only).
Cooler plugged; clean tubes. If plugging
persists, install water conditioner (water-
cooled only).
Cooling air flow restricted; clean cooler
and check for proper ventilation.
Ambient temperature is too high; provide
sufficient ventilation.
Low fluid level; add fluid.
Clogged filter; change the fluid filter
element.
Thermal valve not functioning properly;
replace element.
Water flow regulating valve not functioning
properly; change (water-cooled only).
(Continued)
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