A combustion system includes an electrically actuated flame location control mechanism.

The disclosure provides a controller for a multistage gas furnace, a multistage gas furnace and computer readable medium for performing a method to operate a furnace. In one embodiment, the controller includes: (1) an interface configured to receive a heating call and (2) a corrosion reducer configured to ignite the gas furnace at a high fire operation based on if an indoor circulating fan of the gas furnace is active.

A combustion system includes an electrically actuated flame location control mechanism.

A combustion system includes an electrically actuated flame location control mechanism.

A system for controlling a gas burning appliance is disclosed. The system includes a central control unit. A pilot valve and main valve controls the flow of fuel from a fuel source to the pilot and main valve, respectively, and are configured for accepting an electrical current from a thermopile and from a power source. A spark generator generates for igniting fuel received by the pilot thereby generating a pilot flame. A flame sensor is adapted for monitoring the presence of a pilot flame. A thermopile proximate to the pilot burner is configured for generating an output electrical current for powering the pilot and main valve control devices. A relay routes electrical current between the power source and thermopile to the pilot and main valve control devices. A flame height regulating device conductively coupled with the power source is configured for adjusting a height of a main flame.

A combustion system includes an electrically actuated flame location control mechanism.

A combustion system includes an electrically actuated flame location control mechanism.

A rich-lean burner has on an upper end portion thereof: a lean flame port longitudinally extended to eject a lean fuel-air mixture which is leaner in fuel concentration than a theoretical fuel-air ratio; a blind clearance located on each lateral side of the lean flame port, the blind clearance being free from ejection of a fuel-air mixture; and a rich flame port located on lateral outside of each of the blind clearances to eject a rich fuel-air mixture which is richer in fuel concentration than the theoretical fuel-air ratio. The rich-lean burner further has a lean-flame deforming device to deform a lean flame formed by combustion of the lean fuel-air mixture ejected from the lean flame port such that the shape of one lateral side of the lean flame becomes asymmetrical with the shape of laterally opposite side of the lean flame.

Provided is a combustor that is made compact and achieves NOx reduction. In the combustor (1) including a pilot nozzle (21) disposed along the central axis of the combustor (1) and performing diffusion combustion, a plurality of main nozzles (22) disposed on the outer peripheral side of the pilot nozzle (21) at intervals in the circumferential direction and performing premixing combustion, a single inner cylinder (2a) surrounding the pilot nozzle (21) and the main nozzles (22), and an outer cylinder approximately coaxially surrounding the outer side of the inner cylinder (2a) to form a compressed air passage (6) between the inner peripheral surface thereof and the outer peripheral surface of the inner cylinder and turning the flow direction of compressed air flowing in the compressed air passage (6) in approximately the opposite direction at the end of the inner cylinder (2a) to introduce the compressed air into the pilot nozzle (21), the compressed air passage (6) is provided with a flow rate controller that makes the flow rate on the combustor (1) inner peripheral side of the passage larger than that on the outer peripheral side. An example as the flow rate controller is a baffle plate 51 provided with holes 55, 56.

A selector valve and shutter mechanism for use with a gas burner unit is disclosed. The valve includes a pilot gas manifold which is in communication with two pilot flames and associated ODS for two different kinds of gas fuel. The shutter mechanism opens or closes an opening to a burner mixing chamber to thereby adjust the flow of air into the mixing chamber depending on the fuel selected, and preferably is in the form of a sleeve that in one approach is rotatably mounted on a part of the burner mixing chamber, with a part of the sleeve covering the mixing chamber opening in one orientation and opening it to airflow in another orientation. A first gear is mounted on the sleeve which is engageable with a second gear mounted on part of the valve which is rotatable to one position or another depending on the gas fuel selected, the sleeve thereby adjusting the airflow to the mixing chamber in response to the valve position. In another approach, the cover moves linearly along the burner tube between orientations. A novel selector mechanism having a manifold for gas flows and a plate-like element to adjust the manifold is also disclosed.