Automatic temperature and humidity regulation – Hot-air furnace – Air and fire control
Patent
1982-09-30
1984-12-11
Wayner, William E.
Automatic temperature and humidity regulation
Hot-air furnace
Air and fire control
F24D 500
Patent
active
044873611
ABSTRACT:
A control circuit controls the delivery of fuel to a burner used to heat a heat exchanger in a furnace. A thermostat provides a fuel demand signal to a fuel valve causing the fuel valve to open to feed fuel to the burner to heat the heat exchanger. Once the heat exchanger is warmed to, for example, 250.degree. the blower is activated by a low temperature switch. A high temperature safety switch is used to shut off the fuel valve if the temperature of the heat exchanger gets dangerously high, such as 800.degree. F. A first switch is placed in series with the thermostat and the fuel valve and remains closed until the temperature of the heat exchanger rises above a first temperature, for example 500.degree. F. When this occurs the first switch opens so the flame extinguishes. Once the heat exchanger temperature drops to a second temperature, such as 350.degree. F., the first switch closes, thus resupplying fuel to the burner. This cycling ensures that the temperature of the heat exchanger remains at an efficient, but comfort producing temperature range. To eliminate the possibility that the first switch may open before the blower is actuated, a normally closed third switch is placed parallel across the first switch. The third switch is opened, thus removing it from the circuit, whenever the blower is active.
REFERENCES:
patent: 2615634 (1952-10-01), Harbin, Jr.
patent: 4140274 (1979-02-01), Nabinger
BBC Industries Inc.
Wayner William E.
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