Overtemperature control

Details Overtemperature control Overtemperature control

1990-02-21

1990-08-28

Wayner, William E.

Automatic temperature and humidity regulation

Hot-air furnace

Air and fire control

62158, 165 12, 236 46E, 431 68, F23N 520

Patent

active

049518704

ABSTRACT:
A blower motor failure is detected by a sensor/switch that opens at a first preset temperature level and automatically resets for the next cycle. The occurrences of such openings per thermostat cycle are counted and when they reach a predetermined number, the microprocessor causes the system to lockout from further operation, thereby preventing the temperatures from reaching excessive levels. In order that the same system may be used in a horizontal furnace installation where the first sensor is less responsive because of its location, a second sensor, of the manually resettable type and having a preset temperature level for opening which is higher than said first temperature limit, is employed to thereby lockout the system.

REFERENCES:
patent: 4373662 (1983-02-01), Bassett et al.
patent: 4445841 (1984-05-01), Tanaka et al.
patent: 4790143 (1988-12-01), Hanson

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