F - Mech Eng,Light,Heat,Weapons – 24 – H
Patent
F - Mech Eng,Light,Heat,Weapons
24
H
F24H 9/20 (2006.01) F24H 1/20 (2006.01) G01K 1/14 (2006.01) G05D 23/24 (2006.01) H05B 1/02 (2006.01) H05B 3/82 (2006.01)
Patent
CA 2281951
A screwplug type water heater (10) has a heating element (12) immersible in a water heater tank (T) to heat water (L). Electrical terminals (28) on the outer end of the heater connect the heating element into a heater circuit (H) for a control unit (14). The control unit also includes a sensing circuit (S) for the unit to be responsive to water temperature inputs to turn-on the heater to heat water to a desired temperature and maintain it there. A thermistor ( 16) provides a temperature input to the control circuit. The thermistor is encapsulated in a bracket (32) mounted in, or integrally formed with, the screwplug to sense water temperature. Terminals (36) on the outer end of the heater allow the thermistor to be connected into the control circuit. By integrally forming the thermistor and its support structure, the heater, the entire assembly can be installed or removed as a single unit. Also, the thermistor can readily be made to be removable from the heater, so that it can be removed without removing the heater.
Barnes Ronald R.
Cockrell Robert K.
Borden Ladner Gervais Llp
Emerson Electric Co.
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