Section 8
TROUBLESHOOTING
29
8.2 TROUBLESHOOTING GUIDE
SYMPTOM PROBABLE CAUSE REMEDY
COMPRESSOR WILL
NOT START
COMPRESSOR SHUTS
DOWN WITH AIR
DEMAND PRESENT
Main Disconnect Switch Open
Line Fuse Blown
Control Transformer Fuse Blown
Motor Starter Overloads Tripped
Low Incoming Line Voltage
Loss of Control Voltage
Low Incoming Voltage
Excessive Operating Pressure
Discharge Temperature Switch Open
Close switch.
Replace fuse.
Replace fuse.
Re-set. Should trouble persist, check whether
motor starter contacts are functioning properly.
Check voltage. Should voltage check low, consult
power company.
Re-set. If trouble persists, check that line pres-
sure does not exceed maximum operating pres-
sure of the compressor (specified on nameplate).
Consult power company.
Defect in pressure switch; check pressure at
which contact points open.
Separator requires maintenance; check mainte-
nance indicator under full load conditions.
High pressure shutdown switch is adjusted too
low; re-adjust to 135 psig (9.3 bar).
Defective solenoid valve; solenoid valve should
cause control lever to move to unload stop when
the pressure switch contacts open. Repair if
defective.
Defective blowdown valve; blowdown valve
should exhaust sump pressure to 40 to 55 psi
(2.7 to 3.8 bar) when maximum operating pres-
sure is reached. Repair if defective.
Cooling water temperature too high; increase
water flow (water-cooled only).
Cooling water flow insufficient; check water lines
and valves (water-cooled only).
8.1 TROUBLESHOOTING
The information contained in the Troubleshooting
chart is based upon both actual applied situations
and extensive testing at the factory. It contains
symptoms and usual causes for the described prob-
lems. However, DO NOT assume that these are the
only problems that may occur. All available data
concerning the trouble should be systematically
analyzed before undertaking any repair or compo-
nent replacement procedures.
A detailed visual inspection is worth performing for
almost any problems which may prevent unneces-
sary damage to the compressor. Always remember
to:
a. Check for loose wiring.
b. Check for damaged piping.
c. Check for parts damaged by heat or an electri-
cal short circuit, usually apparent by discol-
oration or a burnt odor.
Should your problem persist after making the rec-
ommended check, consult your nearest Sullair rep-
resentative or the Sullair Corporation factory.
Continued ...
For additional troubleshooting information, con-
sult the Supervisor Controller Manual.
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