G - Physics – 05 – D
Patent
G - Physics
05
D
341/32, 309/42
G05D 23/19 (2006.01) F24D 19/10 (2006.01) F24H 9/20 (2006.01) H01H 1/60 (2006.01) H05B 1/02 (2006.01)
Patent
CA 1219891
CONTROL SYSTEM FOR WATER HEATER WITH EXTERNAL HEAT SOURCE ABSTRACT: There is disclosed a control system for a water heater operatively associated with an external heat source. The water heater includes a water storage tank and a tank heating unit. The tank heating unit has a tank thermostat which closes when there is a demand for hot water in the tank, allowing a flow of current through the tank heating unit so as to turn it on. The tank thermostat opens when the demand has been satisfied, interrupting the current flow so as to turn off the tank heating unit. The control system is responsive to an initial current surge through the tank heating unit for interrupting the current flow so as to maintain the tank heating unit off. This initial current surge cleans the contacts of the tank thermostat by burning off any residue thereon. The control system also turns on the external heat source. The control system is responsive to an exter- nal condition for turning off the external heat source, turning on the tank heating unit, and maintaining the external heat source off and the tank heating unit on until the tank thermostat opens.
471339
Picarello Joseph F.
Shaffer Jacob E. Jr.
Macrae & Co.
York International Corporation
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