Electric heater with dual overheat limits
AssigneeKing Electrical Manufacturing Company
InventorBradley J. Wilson
Life of this patent
Estimating the term…
Abstract
An electric heater comprises a housing with an air inlet area, an air outlet area, an electric heating element disposed between the inlet area and outlet area, a fan that moves air through the heater, a first high-temperature limit switch mounted on the housing in the air inlet area, and a second high-temperature limit switch mounted on housing in the air outlet area, the first and second switches being electrically connected in series with each other and to the heating element so as to disconnect power to the heating element when either switch is tripped.
Claims14
An electric heater having a housing made of metal with a back plate, an air inlet area, an air outlet area, an electric heating element disposed between the inlet area and outlet area, and a fan that draws air into the inlet area, moves it across the heating element, and discharges it from the outlet area, an improved overheating system, comprising:
- a first high-temperature limit switch mounted on the back plate of the housing in the air inlet area outside the air stream passing through said heater, whereby the first high-temperature switch detects the temperature of the metal at that location, the switch being electrically connected to the heating element so as to disconnect power to the heating element when the switch is tripped.
An electric heater, comprising:
- a metal housing with a back plate an air inlet area, and an air outlet area;
- an electric heating element disposed between the inlet area and outlet area;
- a fan that draws air into the inlet area, moves it across the heating element, and discharges it from the outlet area;
- and
- a first high-temperature limit switch mounted on the backplate of the housing in the air inlet area outside the air stream passing through said heater, whereby the first high-temperature switch detects the temperature of the metal at that location, the switch being electrically connected to the heating element so as to disconnect power to the heating element when the switch is tripped.
An electric heater, comprising:
- a metal housing with a back plate, an air inlet area, and an air outlet area;
- an electric heating element disposed between the inlet area and outlet area;
- a fan that draws air into the inlet area, moves it across the heating element, and discharges it from the outlet area;
- a first high-temperature limit switch mounted on the back plate of the housing in the air inlet area outside the air stream passing through said heater, whereby the first high-temperature switch detects the temperature of the metal at that location;
- and
- a second high-temperature limit switch mounted on the back plate of the housing in the air outlet area outside the air stream passing through said heater, whereby the second high-temperature switch detects the temperature of the metal at that location, the first and second switches being electrically connected in series with each other and to the heating element so as to disconnect power to the heating element when either switch is tripped.
An electric heater, comprising:
- a metal housing with a back plate, an air inlet area, and an air outlet area;
- an electric heating element disposed between the inlet area and outlet area;
- a fan that draws air into the inlet area, moves it across the heating element, and discharges it from the outlet area;
- a first high-temperature limit switch mounted on the back plate of the housing in the air inlet area outside the air stream passing through said heater, whereby the first high-temperature switch detects the temperature of the metal at that location;
- and
- a second high-temperature limit switch mounted on the back plate of the housing in the air outlet area outside the air stream passing through said heater, whereby the second high-temperature switch detects the temperature of the metal at that location, the first and second switches being electrically connected in series with each other and to the heating element so as to disconnect power to the heating element when either switch is tripped.
An electric heater, comprising:
- a metal housing with a back plate, an air inlet area, and an air outlet area;
- an electric heating element disposed between the inlet area and outlet area;
- a fan that draws air into the inlet area, moves it across the heating element, and discharges it from the outlet area;
- a first high-temperature limit switch for sensing the temperature of the inlet area having a temperature trip range is between 130 and 170 degrees Fahrenheit, the first high-temperature switch mounted on the back plate of the housing in the air inlet area outside the air stream passing through said heater, whereby the first high-temperature switch detects the temperature of the metal at that location;
- and
- a second high-temperature limit switch for sensing the temperature of the outlet area having a temperature trip range is between 190 and 225 degrees Fahrenheit, the second high-temperature switch mounted on the back plate of the housing in the air outlet area outside the air stream passing through said heater, whereby the second high-temperature switch detects the temperature of the metal at that location, the first and second switches being electrically connected in series with each other and to the heating element so as to disconnect power to the heating element when either switch is tripped.
Dependencies are inferred from the claim text.