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Richland Center, WI, United States

Patent
A.O. Smith Corporation | Date: 2013-03-15

Systems and methods are described for controlling the current of a sacrificial anode based on the conductivity state of the water. An unregulated current of the sacrificial anode relative to the water tank is measured and a conductivity state of the water is identified based on the measured unregulated current. A maximum current limit for the sacrificial anode is determined based on the conductivity state of the water and the current of the sacrificial anode is limited such that the current does not exceed the determined maximum current limit.


Patent
A.O. Smith Corporation | Date: 2015-06-09

A water heating system includes a tank, one or more heating elements mounted on the water heating system, and a first controller mounted on the tank. The first controller is coupled to the one or more heating elements and includes logic to activate and deactivate the heating elements according to a first threshold value. The water heater also includes a second controller that is selectively coupled to the first controller and configured to communicate the first threshold value to the first controller, and perform an additional function related to the operation of the water heater. The first controller is configured to receive the first threshold value from the second controller and control the one or more heating elements based on the received threshold value, and to control the one or more heating elements mounted on the water heating system in a physical absence of the second controller.


Patent
A. O. Smith Corporation | Date: 2015-11-12

A method of assembling multiple low NO


Patent
A. O. Smith Corporation | Date: 2014-10-21

An internal double wall condenser for a tank-type heat pump water heater. The condenser includes inlet and outlet sections designed for low heat transfer and a coil section designed for high heat transfer. The condenser includes first and second inner tubes that conduct refrigerant, and an outer tube surrounding the inner tubes. The outer tube has a circular cross-section in the inlet and outlet sections and a barbell cross-section in the coil section. The barbell cross-section includes first and second conduits that contain and are in heat transfer contact with the respective first and second inner tubes, and a connecting portion that interconnects the first and second conduits and increases the heat transfer surface. The barbell cross-section is made by deforming the outer condenser tube such that opposite walls are brought together between the two inner tubes.


Patent
A. O. Smith Corporation | Date: 2014-02-25

A water heating system includes a tank, one or more heating elements mounted on the water heating system, and a first controller mounted on the tank. The first controller is coupled to the one or more heating elements and includes logic to activate and deactivate the heating elements according to a first threshold value. The water heater also includes a second controller that is selectively coupled to the first controller and configured to communicate the first threshold value to the first controller, and perform an additional function related to the operation of the water heater. The first controller is configured to receive the first threshold value from the second controller and control the one or more heating elements based on the received threshold value, and to control the one or more heating elements mounted on the water heating system in a physical absence of the second controller.

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