Automatic temperature and humidity regulation – Closed fluid heaters – Safety cut-out
Patent
1989-08-29
1991-01-22
Tanner, Harry B.
Automatic temperature and humidity regulation
Closed fluid heaters
Safety cut-out
236 94, 431 16, 431 60, F23N 524
Patent
active
049864688
ABSTRACT:
A gas fired burner includes a pilot gas valve and a burner gas valve sequentially operated to light the burner. A monitor includes individual monitoring of the status of the valves and the burner as well as other components and systems associated with the burner and includes separate lamps for each components. A test circuit monitors the sequential ignition cycle and includes a timing circuit having a timing period somewhat longer than the selected ignition period. An indicator lamp is connected to the timing unit. A sensing device is connected to the pilot gas valve and to the burner gas valve and each establishes an output in response to activation of pilot gas valve and burner valve. The pilot valve signal turns on the timing unit and the burner valve signal turns off the timing unit such that the indicator lamp is actuated only if ignition of the burner is not established within said selected ignition period. The signals are applied to a common input of a comparator, the output of which is connected to the timing unit.
REFERENCES:
patent: 2903052 (1959-09-01), Aubert
patent: 4298334 (1981-11-01), Clark
patent: 4644266 (1987-02-01), Reuter
A.O. Smith Corporation
Tanner Harry B.
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