Vent proving system
AssigneeField Controls, LLC
InventorJames L. Aycock
Life of this patent
Estimating the term…
Abstract
A vent proving system is described for use with a gas fired appliance. The gas fired appliance includes a gas burner, a vent damper for selectively opening or closing an exhaust vent from the gas fired appliance and a relay control for operatively controlling the vent damper and the gas burner to open the damper if the gas burner is on. The vent proving system comprises a sensor for sensing a variable in the vent representing air flow direction in the vent. An electrical switch is connected in series between the relay control and the vent damper. A controller is operatively connected to the sensor, the electrical switch and to the relay control.
Claims8
A vent proving system for use with a gas fired appliance including a gas burner, a vent damper for selectively opening or closing an exhaust vent from the gas fired appliance and a relay control for operatively controlling the vent damper and the gas burner to open the damper if the gas burner is on, the vent proving system comprising:
- a housing for mounting to the vent;
- a control board in the housing including a first connection means for connection to the gas fired appliance and a second connection means for connection to the vent damper;
- a thermostat secured to the housing and including a sensing probe protruding into the vent for sensing temperature in the vent;
- an electrical switch in the housing connected between the first connection means and the second connection means for connection in series between the relay control and the vent damper;
- and
- a controller on the control board operatively connected to the sensor, the electrical switch and to the first connection means and the second connection means, the controller determining if a back draft condition is present in the vent when the gas burner is on and selectively operating the electrical switch to open the connection between the relay control and the vent damper if a back draft condition is present in the vent when the gas burner is on.
Dependencies are inferred from the claim text.