Abstract: A control system for a solid fuel combustion appliance, e.g., a wood burning stove, includes a temperature sensor for sensing an output temperature of the appliance. A controller receives the output temperature and controls a damper associated with air flow through the stove to maintain a predetermined temperature. The system also includes a detector that senses certain conditions of the solid fuel, e.g., wood, that is burned by the stove. When additional fuel is added to the appliance, the system temporarily encourages initial combustion of the new fuel, before returning to maintaining the predetermined temperature.

Abstract: A control system for a solid fuel combustion appliance, e.g., a wood burning stove, includes a temperature sensor for sensing an output temperature of the appliance. A controller receives the output temperature and controls a damper associated with air flow through the stove to maintain a predetermined temperature. The system also includes a detector that senses certain conditions of the solid fuel, e.g., wood, that is burned by the stove. When additional fuel is added to the appliance, the system temporarily encourages initial combustion of the new fuel, before returning to maintaining the predetermined temperature.

Abstract: A fan modulated premix burner control system includes a regulating control valve for regulating the pressure of gas fed to a premix chamber. The pressure of the gas is based on the pressure of air also fed into the chamber to produce a constant air/fuel ratio. The system also includes an air restrictor for reducing the pressure of the air to permit operation of the burner at low fan speeds.

Abstract: A modulator valve assembly (10) includes a valve seat (32) assembled as part of a housing (12), and the valve seat (32) defines inlet and outlet ports to allow fluid to flow between an inlet passage (28) and an outlet passage (30) along a fluid flow path. The modulator valve assembly (10) also includes a movable valve member (62) that is threaded to a rod (56) that extends through the valve seat (32), and as the rod (56) rotates, the movable valve member (62) moves axially along the rod (56). A pin (72) extends from the housing (12) to engage the movable valve member (62) to prevent the movable valve member (62) from rotating with the rod (56). The movable valve member (62) slides along the rod (56) into the fluid flow path and blocks the fluid from entering the housing (12).

Abstract: A method of determining the amount of air flowing through an outside air damper of a recirculating air heater includes the steps of sensing an amount of airflow flowing through the damper, recording the amount of airflow and a damper position value at a plurality of damper positions, and interpolating a curve relating the amount of airflow to the damper position for all damper positions between a minimum damper position and a maximum damper position. Once the amount of air flowing through the outside air damper is determined from a position on the curve, the concentration of carbon dioxide (CO2) within a building space can be calculated and/or determined to be within acceptable limits.