Microcontroller and system for controlling trial times in a furn

Details Microcontroller and system for controlling trial times in a furn Microcontroller and system for controlling trial times in a furn

1990-08-17

1991-06-25

Dority, Carroll B.

Combustion

Timer, programmer, retarder or condition responsive control

With test circuit checking or analyzing flame sensing...

431 27, 431 69, F23N 100

Patent

active

050262700

ABSTRACT:
A microcontroller and system allowing for more than one trial time in a furnace system, while using only one pin of the microcontroller. An alternating current signal at an input port of the microcontroller causes the microcontroller to allow a first long trial time period. Any direct current signal at the input port causes the microcontroller to allow only a second shorter trial time period. The trial time input port of the microcontroller is placed between two ports which either receive or send direct current signals. Due to this arrangement of the parts and construction of the microcontroller, the microcontroller will fail to the shorter and safer trial time if a fault causes an erroneous signal to appear at the input port.

REFERENCES:
patent: 3954383 (1976-05-01), Bryant
patent: 4319873 (1982-03-01), Michaud et al.
patent: 4359315 (1982-11-01), Matthews
patent: 4518345 (1985-05-01), Mueller et al.
patent: 4695246 (1987-09-01), Beilfuss et al.
patent: 4832594 (1989-05-01), Youtz
patent: 4854852 (1989-08-01), Patton et al.
patent: 4865538 (1989-09-01), Scheele et al.

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