Electronic temperature control system for a tankless water heate

Details Electronic temperature control system for a tankless water heate Electronic temperature control system for a tankless water heate

1989-12-11

1990-11-13

Paschall, M. H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219492, 219494, 219501, 219508, 323908, H05B 102

Patent

active

049703730

ABSTRACT:
A closed loop, electronic temperature control system for a tankless water heater. The control system incorporates error range comparison circuitry for comparing the difference between a water temperature selected from a temperature selection device and an actual water temperature sensed by a temperature sensing device. An error range comparison circuit operates to select a high gain when the sensed water temperature is within about +/-3.degree. Fahrenheit of the selected temperature, and a low gain when the sensed water temperature is more than +/-3.degree. Fahrenheit of the selected water temperature. A slow start network is included for applying current gradually to the heating element of the water heater when power is initially applied to the system. A master power down circuit quickly interrupts current flow to the heating element after the system has been powered down.

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patent: 4337388 (1982-06-01), July

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