Method and appts. for detecting dry fire condition in water heater
A technology for water heaters and heating elements, applied in lighting and heating equipment, temperature control using analog comparators, water heaters, etc.
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[0031] As noted above, the use of a proportional band temperature controller in a water heater with a resistive heating element has the unexpected advantage of heating the water in the water heater to a preselected set point temperature more than the same temperature controller using a prior art mechanical temperature controller. It takes less electricity to heat an equal volume of water to the same set point temperature in a water heater.
[0032] An exemplary proportional band temperature controller is an electronic device that includes: a water temperature sensing device (thermistor); a temperature set point device (varistor); a gated thyristor to switch electrical power to a resistor a heating element; and logic circuitry for controlling the thyristors in response to signals from the water temperature sensing device and the temperature set point device. The logic circuit receives voltage inputs from the water temperature sensing device and the temperature set point device,...
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