초록 ▼

A gas-fired heating and ventilation system includes a blower which draws air through a recirculation damper from a building and through a direct gas-fired burner from a fresh air inlet. A passive control damper is mounted to bypass air around the burner and to thereby regulate the air flow through t

A gas-fired heating and ventilation system includes a blower which draws air through a recirculation damper from a building and through a direct gas-fired burner from a fresh air inlet. A passive control damper is mounted to bypass air around the burner and to thereby regulate the air flow through the burner for optimum combustion over a wide range of operating conditions.

대표청구항 ▼

[ We claim:] [1.] In a heating system having an air inlet chamber and a blower chamber separated by a dividing wall, a direct gas-fired burner mounted in a first opening in the divider wall to heat air flowing through the first opening from the air inlet chamber to the blower chamber, the improvemen

[ We claim:] [1.] In a heating system having an air inlet chamber and a blower chamber separated by a dividing wall, a direct gas-fired burner mounted in a first opening in the divider wall to heat air flowing through the first opening from the air inlet chamber to the blower chamber, the improvement comprising:a passive control damper mounted in a second opening coupled to the blower chamber to shunt air around the direct gas-fired burner and to thereby regulate the flow of air through the first opening to a substantially constant level, the passive control damper including:a frame which defines the second opening;a damper blade mounted to the frame for motion between a closed position in which the damper blade substantially blocks the flow of air through the second opening, and an open position in which air can freely pass through the second opening; andpassive bias means coupled to the damper blade for applying a force which moves the damper blade toward its closed position and which has a magnitude that is substantially equal to an air pressure force acting on the damper blade over a range of air flow volumes shunted through the second opening.