Curtis-Toledo Rotary Compressor
CAP862
Operations and Maintenance Manual
Chapter 7 Page 1
7.0 Troubleshooting
Compressor will not start
a. No power
b. Fuses blown in the control circuit.
c. Motor overload latch not reset.
d. Heaters not installed in starter.
e. Loose or missing wires or components in
the control circuit.
f. Low voltage e.g. using 230 volt in a 460
volt system.
g. Faulty temperature switch.
h. Suction valve does not close.
i. Pressure in oil separator tank.
Unit starts – but shuts down immediately
a. Pressure switch or timer failure.
b. Incorrect heaters or adjusted too low in
starter.
c. High Air Temperature switch open due to
restricted oil flow.
d. Loose or missing electrical components.
e. Pressure switch set too high.
f. Motor overloads trip out.
g. Low voltage.
Compressor does not build up to the desired
pressure.
a. Inlet valve partially closed.
b. Belt slippage.
c. Restricted inlet air cleaner.
d. Excessive air demand.
e. Defective pressure gauge.
f. Pressure switch set too low.
g. Excessive pressure drop across the separator
element.
h. Solenoid valve stuck open.
i. Air end malfunction – excessive clearance
or rotor movement.
j. Compressor sized too small.
k. Safety valve keeps discharging.
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