Stoves and furnaces – Heaters – Surface
Patent
1976-07-23
1978-12-12
Wayner, William E.
Stoves and furnaces
Heaters
Surface
236 91A, 307359, F24J 302
Patent
active
041291182
ABSTRACT:
Detecting the temperature of water moving from a solar collector to a hot water storage and detecting the temperature of the water in the hot water storage by thermistor devices, comparing the resistance differences of the thermistor devices and providing a voltage proportional to the differences and comparing the voltage with a reference voltage providing a first output difference signal. Comparing the first output signal in a differential amplifier device with a second reference voltage providing an output for opening and closing a switch circuit to a pump when the temperature differential exceeds or is less than a given amount. Also detecting by a third thermistor the temperature of the water in the solar collector and then comparing the resistance of the third thermistor relative to a standard resistance providing a control voltage to the second differential amplifier. This provides an output signal that also opens or closes the pump switch circuit in response to the temperature of the water in the solar collector falling below a given temperature. The system also selectively changes the second reference voltage in response to the switch to the pump being opened and closed, so that the pump is energized at or above a given water temperature differential between the solar collector and the hot water storage, and is de-energized when the temperature differential is a lesser amount.
REFERENCES:
patent: 3931806 (1976-01-01), Hayes
patent: 3986489 (1976-10-01), Schlesinger
patent: 3998207 (1976-12-01), Watt
patent: 4019495 (1977-04-01), Frazier et al.
Samuel G. Dawson
Wayner William E.
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