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E-5
THEORY OF OPERATION
THERMAL PROTECTION
A thermostat protects the machine from
excessive operating temperatures.
Excessive operating temperatures may be
caused by lack of cooling or operating the
machine beyond the duty cycle and output
rating. If excessive operating temperature
should occur, the thermostat will prevent
voltage and wire drive. The fan will remain
on during this period. The thermostat is self-
resetting once the machine cools sufficient-
ly. If the thermostat shutdown is caused by
excessive output or duty cycle and the fan
is running normally, the power switch may
be left on and the reset should occur within
a 15 minute period. If the fan is not turning
or the air intake louvers are obstructed then
the input power must be removed and the
fan problem or air obstruction must be cor-
rected.