An automatic pilot lighting system for unattended automatic lighting of a standing pilot may include a powered (e.g., battery powered, etc.) circuit. The powered circuit may include an analog timer circuit including a timer switch. A spark ignitor may be coupled with the timer switch. A temperature knob pilot momentary switch may be coupled with the timer switch. An ON/OFF switch may be coupled with the temperature knob pilot momentary switch and the timer switch. The ON/OFF switch may be configured to be operable for selectively disabling and enabling a power source. The analog timer circuit may be configured to be selectively activatable for applying voltage from the power source via the ON/OFF switch for pilot hold voltage and spark ignition for an amount of time sufficient to allow for unattended automatic lighting of the standing pilot and sufficient voltage generation to support standalone operation.

An automatic carbon monoxide power cut-off system for a carbon monoxide source, where the system includes a microprocessor co-located with the carbon monoxide source, and a carbon monoxide sensor in wireless communication with the microprocessor and configured to detect presence of carbon monoxide and wirelessly transmit a sensor signal to the microprocessor, and the microprocessor being configured to generate a trigger signal in response to the sensor signal indicative of carbon monoxide exceeding a predetermine level. A power cut-off device is coupled to the microprocessor and is configured to automatically cut off power to the carbon monoxide source in response to the trigger signal, so that the carbon monoxide source automatically stops generating carbon monoxide. The carbon monoxide source may include a furnace and a power generator.

The present disclosure relates to a control method of a gas furnace comprising a step for measuring an indoor temperature, a step for comparing the indoor temperature with a set temperature for heating, and a step for operating the gas furnace in weak heating with a predetermined heating capacity which is lower than a maximum heating capacity of the gas furnace, when the set temperature for heating is higher than the indoor temperature by a temperature value which is less than a predetermined temperature value, wherein the predetermined heating capacity for weak heating is maintained at a current heating capacity for weak heating, when the gas furnace operates in weak heating, and when an operating duration with the current heating capacity for weak heating is less than a first time value.

Gas cooktops disclosed herein may include a proportional solenoid valve controlling gas flow to a gas burner, where the proportional solenoid valve has a continuously variable range of positions. A user interface (UI) element associated with the proportional solenoid valve may be utilized to control a linear voltage regulator having a continuously variable output voltage. The output voltage of the linear voltage regulator is coupled to a solenoid of the proportional solenoid valve, such that the gas flow to the gas burner has a linear relationship with the output voltage of the linear voltage regulator.

A safety system for a gas apparatus (100) for heating water, the gas apparatus comprising a tank (1) for containing water and a first gas burner (2) for heating the water contained inside the tank (1). The safety system (200, 200′) comprises a first sensor (9) suitable for generating a first signal which represents a temperature of the water contained in the tank (1), a second sensor (10) suitable for generating a second signal which represents a temperature of the water contained in the tank (1), a supply circuit (11) for energizing a first actuator (4) of a first valve (3) which is arranged to allow to pass/intercept a flow of gas towards the first gas burner (2), the first actuator (4) being arranged to actuate so as to open and close the first valve (3) when it is energized and non-energized, respectively, a switch device (13) which is arranged in the supply circuit (11) in order to close/open the supply circuit (11) so as to energize/not to energize the first actuator (4), a digital processing unit (14) which is operatively connected to the first and/or second sensor (9, 10) and which is configured to compare a set-point value which represents a preselected temperature with the first or second signal and a control device (16) which is operatively connected to the switch device (13) and to the first and second sensors (9, 10). The control device (16) comprises an analogue comparator (17) which is operatively connected to the first and second sensors (9, 10) in order to compare the first signal with the second signal and the control device (16) is configured to generate a control signal (18) for controlling so as to open/close the switch device (13) on the basis of the comparison between the first and second signals carried out by the analogue comparator (17).

Methods for regulating a heating device, which includes a combustion chamber, into which combustion air is introduced via a controllable blower. An operating variable and a speed of the blower are measured. An operating coefficient is determined on the basis of the measured operating variable and the measured speed. A volume flow coefficient is determined on the basis of reference values for the operating coefficient. A volume flow of the combustion air being determined on the basis of the volume flow coefficient. A calibration of the reference values is carried out for the operating coefficient.

A dual-gas source gas control system with anti-gas source misconnection and a control circuit thereof belonging to the gas combustion technical field are provided. The disclosure solves unreasonable design and other problems in the related art. The dual-gas source gas control system with anti-gas source misconnection and the control circuit thereof includes a power-on circuit, connected in series with an external power supply and an igniter switch to form a loop, including a self-locking switch triode connected in series with the external power supply and a self-locking amplifying triode connected to a base electrode of the self-locking switch triode; an MCU control circuit, including an MCU control chip, wherein the power-on circuit is connected to a power input pin of the MCU control chip, one pin on the MCU control chip is configured to detect whether the power-on circuit is connected.

A water heater control system comprising an energy storage system electrically connected to a pilot valve operator and electrically isolated from a main valve operator. The energy storage system may be electrically connected to an ignition circuit. A thermoelectric device is in thermal communication with the pilot flame and electrically connected to a main valve operator. The water heater system may include a microcontroller configured to establish electrical communications between the device and the energy storage system, the pilot valve operator, and the main valve operator. The microcontroller may be configured to recognize a call for main burner operation, and may also be configured to check an available voltage of the energy storage system against a setpoint. The microcontroller may establish pilot flame operation with or without main burner operation, depending on whether a call for heat or recharging of the energy storage system is required.

Disclosed is an induced-draft gas-fired furnace that includes: an electronic furnace controller, a burner assembly, a gas valve, and an inducer motor, wherein the controller: accelerates the inducer motor at a first pre-ignition rate to a first pre-ignition speed; controls the gas valve to supply gas to the burner assembly to obtain a first pre-ignition ratio of fuel to air, operates an igniter to attempt to ignite the first fuel mixture, determines whether fuel has ignited in the burner assembly, wherein when fuel having the first pre-ignition ratio of fuel to air remains unignited after a plurality of ignition attempts, the controller: decelerates the inducer motor to a second pre-ignition rate to obtain a second pre-ignition speed and a second fuel mixture comprising a second pre-ignition ratio of fuel to air, and determines whether the second fuel mixture has ignited in the burner assembly.

A flame detection system is designed to detect leakage in flame sense circuits. The flame detection system includes a flame sensor, an amplifier, a detection circuit, and a microcontroller. Flame sense circuitry use operational amplifiers that needs negative voltage supply for its operation. Negative supply voltage properly measures negative input signals. Once a leakage current in the flame detection system is determined a shutdown signal is provided to shut down a flame sensor when the leakage current condition is determined.