Electronic temperature controller for water heaters

Details Electronic temperature controller for water heaters Electronic temperature controller for water heaters

1992-11-06

1995-08-15

Paschall, Mark H.

Electric heating

Heating devices

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

219497, 219508, 219505, 219483, 374105, 340589, H05B 102

Patent

active

054421578

ABSTRACT:
A control/safety apparatus and method for an electrical or fuel fired water heater includes one or more temperature sensors strategically located on the water heater vessel at a level at or above a critical water level. The time rate of temperature change is calculated from the sensed temperature. An abnormal value of temperature change rate corresponding to an insufficient water level deactivates the heater to prevent damage to the heater. Water level, projected heating times, heater malfunctions and other operating parameters may be calculated or detected based on the time rate of change in sensed temperature.

REFERENCES:
patent: 4493981 (1985-01-01), Payne
patent: 4524264 (1985-06-01), Takeuchi et al.
patent: 4570054 (1986-02-01), Chidzey et al.
patent: 4585925 (1986-04-01), Andre
patent: 4587406 (1986-05-01), Andre
patent: 4740671 (1988-04-01), Kuroda et al.
patent: 5079407 (1992-01-01), Baker
patent: 5103078 (1992-04-01), Boykin et al.

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