A combustion control device includes a combustion fan motor, a control unit, a silicon diode group, a silicon diode, and a combustion-fan-disconnection detecting unit. The control unit is configured to control a combustion state of the combustion fan motor. The silicon diode group includes at least two silicon diodes coupled in series to the combustion fan motor. The silicon diode is coupled in parallel to the silicon diode group with a reversed polarity. The combustion-fan-disconnection detecting unit includes a photocoupler and a resistor. The photocoupler and the resistor are coupled in parallel to the silicon diode group and the silicon diode with the same polarity as a polarity of the silicon diode group side.

A system includes a multi-tube fuel nozzle with a fuel nozzle body and a plurality of tubes. The fuel nozzle body includes a nozzle wall surrounding a chamber. The plurality of tubes extend through the chamber, wherein each tube of the plurality of tubes includes an air intake portion, a fuel intake portion, and an air-fuel mixture outlet portion. The multi-tube fuel nozzle also includes a differential configuration of the air intake portions among the plurality of tubes.

In an aspect, an HVAC system includes an inducer motor to provide combustion airflow, and a pressure sensor to measure an output airflow pressure of the inducer motor. The HVAC system may initiate the inducer motor, and receive a pulse width modulation (PWM) signal from the inducer motor, wherein the PWM signal indicates a PWM signal of the inducer motor corresponding to a predetermined airflow pressure of the inducer motor and measured by the pressure sensor. The HVAC system may compare the PWM signal to a baseline value, and control the inducer motor based on the comparing of the PWM signal to the baseline value. The HVAC system may also generate a status notification of the combustion airflow of the HVAC system in response to the comparing the PWM signal to the baseline value.

The disclosed embodiments provide a temperature controlled charcoal grill and smoker that enables users to better control the cooking and smoking temperature relative to previous solutions. In some embodiments, for example, a user may place a divider in the interior of a fuel basket to coarsely adjust the amount and type of solid fuel used to heat a food-cooking enclosure of the temperature controlled charcoal grill and smoker. In addition, the user can also position a heat deflector tent above one or more heat transfer openings in a grease tray to further adjust the cooking and smoking temperature. Further still, the user can provide even finer control (including closed-loop control) over the cooking and smoking temperature using a controller that controls the speed of a fan that directs combustion air into the fuel basket.

Systems and methods for controlling a variable speed blower of a gas-fired heater associated with a swimming pool or spa are provided. A gas heater may include an air-fuel mixture chamber and a circuit. The circuit may be configured to receive a signal to initiate heating water and output a first control signal that operates a variable speed blower associated with the gas heater at a first rate of speed for a first time duration during ignition of the gas heater. The variable speed blower draws air into the air-fuel mixture chamber where the air is combined with gas fuel to ignite the air and the gas fuel to heat the water. The circuit may also be configured to output a second control signal that operates the variable speed blower at a second rate of speed after the first time duration has expired and after the gas heater is ignited.

A temperature control system for a grill, including a main unit and a fan. The main unit is configured to be mounted on the grill, and the fan is positioned corresponding to the intake port of the grill to adjust the intake volume for controlling fuel combustion. The main unit and the fan are in communication. The main unit includes a control module and a temperature measurement module. The temperature measurement module is used to detect the air ambient temperature of the grill and transmit a first temperature signal to the control module. The control module is configured to control the power of the fan or its on/off state based on the first temperature signal.

A two-blower automated biomass cookstove with sensors that dynamically adjusts air independent air flows and optimizes for the fresh fuel phase, but also manages air through a transitional phase, and then a char phase. The cookstove comprises a housing; a combustion assembly mounted within the housing, dual air flow passageways disposed at least partially within the housing for communicating air flow from outside the housing to a combustion cup, and a control system for automatically and dynamically adjusting relative air flow between the primary and secondary air flow passageways to optimize performance.

A two-blower automated biomass cooking stove with sensors that dynamically adjusts independent air flows and optimizes for the fresh fuel phase, but also manages air through a transitional phase, and then a char phase. The cookstove comprises a housing, a combustion assembly mounted within the housing; dual air flow passageways disposed at least partially within the housing for communicating air flow from outside the housing to a combustion cup, and a control system for automatically and dynamically adjusting relative air flow between the primary and secondary air flow passageways to optimize performance.

A low gas pressure detection and compensation operation method of a gas water heater according to a preferred embodiment of the present disclosure includes an output calculation step of calculating combustion output through combustion temperature detected by a temperature sensor and comparing the calculated output with a reference output, a flame voltage comparison step of detecting flame voltage and comparing the detected flame voltage with a reference flame voltage when the calculated output is smaller than the reference output, and a correction step of adjusting a supply air amount when the detected flame voltage is smaller than the reference flame voltage.

This application relates to a method for controlling the combustion in furnace systems, wherein an oxygen coefficient is determined from the temperature in a combustion chamber area and/or in the waste-gas flues of the furnace system and on the basis of an energy balance of the combustion process in the furnace system, the combustion air and the waste gas, and said oxygen coefficient is used to control the combustion material flows and therefore the thermal output and also the combustion quality. The invention relates to a device for feeding combustion air in the furnace system, which device has a chamber, which on a first side has a main duct for feeding ambient air and/or air from the chimney system and on a second side has a pane-washing air duct and a secondary-air duct, both the pane-washing air duct and the secondary-air duct.