The contactor removes electricity from the heating ele-
ments if the furnace temperature equals or exceeds the
high limit setpoint of the controller or when the door is
opened.
The circuit breaker is used to turn the furnace on and off
and also protects the electrical supply in the event that
the furnace draws too much electrical current.
The pilot light indicates that the circuit breaker is ON and
that the controller is being supplied with electricity.
A fan is provided in each section of the furnace to provide
forced air cooling.
Types of Controllers
1.
The 8 segment digital model enables eight
segments of any type: end, ramp by rate, ramp
by time to target, dwell or step.
2.
The 4 program controller enables four 16 seg-
ment programs with 16 segments of any type:
end, ramp by rate, ramp by time to target,
dwell, step or call.
3.
The 20 program controller enables 20 16 seg-
ment programs with 16 segments of any type:
end, ramp by rate, ramp by time to target,
dwell, step or call.
6
G
ENERAL
D
ESCRIPTION
Note
The fans operate continuously, even
when the circuit breaker is OFF, to
assure that the control section and
the terminals of the heating elements
are continuously ventilated. Without
ventilation, residual heat from the fur-
nace chamber can cause overheating
after the furnace is turned off.
Caution
Do not completely remove electricity
from the furnace until chamber tem-
perature falls below 500°C. Do not
touch exposed elements.
