Lincoln 1100 Series Service Manual page 5

S/N 2011383 and above
AUTOMATIC COOL DOWN
Impinger II –1100 Series Service Manual - Domestic
The speed side of the Time/Temp. Display uses a slotted disc Refer to page 27
(cemented to tach. coupling) to break the infra-red light beam of the optical
encoder (mounted on gear motor), producing electrical pulses that are transmitted
to the display. The display converts these pulses into a read-out of minutes and
seconds.
The temperature portion of the Time/Temp Display uses a Thermistor Probe to
sense oven temperature. The thermistor This resistance is then converted by the
display into a temperature reading.
When this oven is started, the time delay relay timing circuit is enabled, permitting
the oven fans to run for approximately 20 minutes after the oven is shutoff, to cool
the oven. The Time Delay Relay will keep the coil of the Main Fan Relay closed,
maintaining operation of main fan and Cooling Fan Motors.
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