Limit switch control method for a two-stage furnace

Details Limit switch control method for a two-stage furnace Limit switch control method for a two-stage furnace

1988-10-21

1989-12-19

Wayner, William E.

Automatic temperature and humidity regulation

Miscellaneous

Burner controls with automatic cutoff

236 9R, 236 10, 340588, G05D 2312

Patent

active

048877670

ABSTRACT:
A two-stage gas furnace control system automatically shifts into a high fire only mode if, in two consecutive low fire heating cycles a limit switch is tripped to indicate that a gas valve is stuck in a high fire condition. In this way, continued operation is allowed to proceed in a safe manner. Provision is also made to lock out the system from further operation if, while in the high fire only mode, the limit switch is tripped in a predetermined consecutive number of cycles or if, while in a preemptive low fire only mode, the limit switch is tripped.

REFERENCES:
patent: 3523643 (1970-08-01), Caparone et al.
patent: 4315296 (1982-02-01), Hancock
patent: 4421268 (1983-12-01), Bassett et al.
patent: 4638942 (1987-01-01), Ballard et al.

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