Controller for two-stage heat source usable with single and...

Details Controller for two-stage heat source usable with single and... Controller for two-stage heat source usable with single and...

2005-11-02

2010-06-08

Jules, Frantz F. (Department: 3744)

Automatic temperature and humidity regulation

Miscellaneous

Burner controls with automatic cutoff

C236S0010EA, C236S011000, C236S04600F, C165S267000

Reexamination Certificate

active

07731096

ABSTRACT:
A controller for a two-stage heat source is provide, which may be connected to either a single stage or a two-stage thermostat to provide low stage heating for a variable time period before switching to high stage heating. The controller includes at least a first terminal for receiving a signal requesting heating from a single-stage thermostat or a two-stage thermostat connected to the first terminal. A microcontroller in communication with the first terminal determines a duty cycle value for a heating cycle based on the duration in which a signal at the first terminal is present relative to the duration of the heating cycle. The microcontroller determines a low stage time limit from the duty cycle, and provides low stage heating when a signal is present at the first terminal for a time period not more than the time limit, and switches to high stage heating after the time limit.

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