SECTION 6 ES-6 USER MANUAL
75
15. Replace gasket and reinstall the whole inlet
control valve assembly.
16. Apply screw lock adhesive to inlet control
housing assembly ferry head capscrews and
install. Torque to 30 ft.-lbs. (40.7Nm).
17. Reconnect tubing to inlet control valve hous-
ing at 90° elbow.
18. Reinstall air inlet filter assembly.
M
OTOR SHAFT SEAL REPLACEMENT
Replacement of motor shaft seal requires that the
compressor be separated from the drive housing.
This operation requires qualified personnel.
Detailed instructions and a list of needed tooling are
included in each motor shaft seal replacement kit no.
250028-035.
6.7 TROUBLESHOOTING
The information contained in the Troubleshooting
chart is based upon both the actual applied situations
and extensive testing at the factory. It contains
symptoms and usual causes for the described
problems. 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
component replacement procedures.
A detailed visual inspection is worth performing for
almost any problems which may prevent
unnecessary damage to the compressor. Always
remember to:
• Check for loose wiring.
• Check for damaged piping.
• Check for parts damaged by heat or an
electrical short circuit, usually apparent by
discoloration or a burnt odor.
Should your problem persist after making the
recommended check, consult your nearest Sullair
representative or the Sullair Corporation factory.
6.8 TROUBLESHOOTING GUIDE
Symptom Probable Cause Remedy
COMPRESSOR WILL NOT START Main Disconnect Switch Open Close switch.
Line Fuse Blown Replace fuse.
Control Transformer Fuse Blown Replace fuse.
Motor Starter Overloads Tripped Reset. Should trouble persist, check
whether motor starter contacts are func-
tioning properly.
Low Incoming Line Voltage Check voltage. Should voltage check
low, consult power company.
COMPRESSOR SHUTS DOWN WITH
AIR DEMAND PRESENT
Low Incoming Voltage Consult power company.
Excessive Operating Pressure Defect in pressure switch; check pres-
sure at which contact points open.
Discharge Temperature Switch Open
Cooling air flow restricted; clean cooler
and check for proper ventilation.
Ambient temperature is too high; pro-
vide sufficient ventilation.
Low fluid level; add fluid.
Clogged filter; change the fluid filter ele-
ment.
Thermal valve not functioning; replace
element.
Defective discharge temperature switch;
check for a short or open circuit to probe
and correct wiring.
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