Systems and methods herein provide retractable and extendable portable ignitors, ignitor systems, and associated methods for lighting industrial fired equipment. In an embodiment, an ignitor includes a main body including a first body portion movable in a longitudinal direction relative to a second body portion so as to extend or retract to a target operating length, thereby to define an adjustable main body. The ignitor includes a flow path extending through the adjustable main body, a fluid outlet, and a fluid inlet. The fluid inlet is configured to receive and direct a fuel flow through the flow path and to the fluid outlet. The ignitor includes a sparking assembly connected to the adjustable main body proximate the fluid outlet to provide an ignition spark to the fuel flow when passing through the flow path, thereby to facilitate lighting industrial fired equipment via a fueled flame maintained proximate the fluid outlet.

Systems and methods herein provide retractable and extendable portable ignitors, ignitor systems, and associated methods for lighting industrial fired equipment. In an embodiment, an ignitor includes a main body including a first body portion movable in a longitudinal direction relative to a second body portion so as to extend or retract to a target operating length, thereby to define an adjustable main body. The ignitor includes a flow path extending through the adjustable main body, a fluid outlet, and a fluid inlet. The fluid inlet is configured to receive and direct a fuel flow through the flow path and to the fluid outlet. The ignitor includes a sparking assembly connected to the adjustable main body proximate the fluid outlet to provide an ignition spark to the fuel flow when passing through the flow path, thereby to facilitate lighting industrial fired equipment via a fueled flame maintained proximate the fluid outlet.

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 gas flow controller for use in a gas fired apparatus includes an actuator, a pilot valve operably connected to the actuator, a main burner valve, and a flow controller valve operably connected to the actuator. The pilot valve is moveable from a closed position to an open position by actuation of the actuator to provide selective fluid communication between a gas inlet and a first fluid chamber. The main burner valve provides selective fluid communication between the first fluid chamber and a main burner outlet. The flow controller valve is moveable from a closed position to an open position by actuation of the actuator to provide selective fluid communication between the gas inlet and a back side of the main burner valve to maintain the main burner valve in a closed position when the pilot valve is in the open position.

A gas flow controller for use in a gas fired apparatus includes an actuator, a pilot valve operably connected to the actuator, a main burner valve, and a flow controller valve operably connected to the actuator. The pilot valve is moveable from a closed position to an open position by actuation of the actuator to provide selective fluid communication between a gas inlet and a first fluid chamber. The main burner valve provides selective fluid communication between the first fluid chamber and a main burner outlet. The flow controller valve is moveable from a closed position to an open position by actuation of the actuator to provide selective fluid communication between the gas inlet and a back side of the main burner valve to maintain the main burner valve in a closed position when the pilot valve is in the open position.