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9032950 Gas pressure control for warm air furnaces  
Systems, methods, and controllers for controlling gas-fired appliances such as warm air furnaces are disclosed. An illustrative furnace system can include a burner unit in communication with a...
9022064 Dual fuel control device with auxiliary backline pressure regulator  
A heater assembly can be used with a gas appliance. The gas appliance can be a dual fuel appliance for use with one of a first fuel type or a second fuel type different than the first. The heater...
8925541 Method and system for controlling an inducer in a modulating furnace  
A furnace includes an induced draft blower; an inducer motor driving the induced draft blower; and a furnace control determining a modulation percentage, the furnace control controlling RPM of the...
8893707 Gas-fired heater with carbon dioxide detector  
A portable gas-fired heater comprising a housing, a burner assembly, and a carbon dioxide detector system. The housing is adapted to at least partially enclose a fuel source. The burner assembly...
8876524 Furnace with modulating firing rate adaptation  
A furnace is disclosed that includes a burner with a firing rate that is variable between a minimum and a maximum firing rate. After a call for heat is received, the firing rate is set to an...
8770185 Gas fireplace with gas controlling device and method of controlling gas consumption of the gas fireplace  
A gas fireplace includes a gas valve, a combustor, and a gas controlling device between the gas valve and the combustor. The gas controlling device has a body, a solenoid valve, and a main...
8738185 Altitude adjustment for heating, ventilating and air conditioning systems  
HVAC systems and methods are shown which use volumetric air flow and static pressure calculations that correct for different air densities encountered at different altitudes. With respect to the...
8714460 Multi-stage variable output valve unit  
A valve unit for adjusting gas flow to a two-stage combustion apparatus includes a valve member that is moved by a magnetic field generated by a coil to vary gas flow rate through the valve unit,...
8684276 Portable catalytic heater  
Provided is a portable heating device comprising a combustion-powered heater, a regulator, and an oxygen depletion sensor. The combustion-powered heater may be supplied by an associated fuel...
8672670 System and method for controlling a furnace  
Controlling a modulating gas furnace by monitoring a differential pressure associated with the modulating gas furnace using a low pressure limit switch configured to actuate at a first pressure,...
8662885 Method and apparatus for emissions detection in a combustion appliance  
A furnace system that generates heat by combustion is provided. The furnace system includes a sensor (100) that detects a gas concentration. The sensor is in communication with the flue gas (15)....
8635997 Systems and methods for controlling gas pressure to gas-fired appliances  
Systems and methods for controlling gas to gas-fired appliances are disclosed. An illustrative system can include a modulating gas valve adapted to supply gas to a burner unit, an inducer fan...
8591221 Combustion blower control for modulating furnace  
A forced air furnace may include a pneumatically modulated gas valve that is configured to provide gas to a burner. A pneumatic sampling device may be disposed proximate a combustion blower and...
8568136 Heater configured to operate with a first or second fuel  
A heater can be configured to operate with either a first fuel at a first pressure or a second fuel at a second pressure. In some embodiments, a pressure regulator unit is configured to regulate...
8545214 Combustion blower control for modulating furnace  
A furnace includes a combustion blower and one or more pressure switches. In some cases, the one or more pressure switches may be used to calculate one or more operating points for the combustion...
8535050 Forced flue type combustion device  
A forced flue type combustion device in which an orifice is provided in at least one of an air supply passage and an exhaust passage, and in which the existence/nonexistence of a clog is...
8479440 Self-contained heating unit for thermal pest control  
In certain embodiments, an apparatus for killing pests in an affected area includes a fuel source, a first air inlet configured to receive a first air flow from the affected area, and a second air...
8479439 Self-contained heating unit for thermal pest control  
In certain embodiments, an apparatus for killing pests in an affected area includes a fuel source, a first air inlet configured to receive a first air flow from the affected area, and a second air...
8388339 Single micro-pin flame sense circuit and method  
A flame sense circuit and method utilizing only a single pin of a microcontroller is provided. A flame sense circuit is used to vary the charge on a capacitor from a logic high indicating no flame...
8347875 Gas-fired heater with carbon dioxide detector  
A portable gas-fired heater comprising a housing, a burner assembly, and a carbon dioxide detector system. The housing is adapted to at least partially enclose a fuel source. The burner assembly...
8281781 Dual fuel heater  
A dual fuel heater can couple with one of two fuel sources operating at different pressures. The dual fuel heater can have a first fuel line, a second fuel line, a fluid flow controller, and a...
8261733 Modulating gas furnace  
A method controls a modulating gas furnace by monitoring a differential pressure associated with the modulating gas furnace, learning an intermediate value associated with an intermediate capacity...
8146584 Pressure switch assembly for a furnace  
A pressure switch assembly is used with a furnace controller having a first input and a second input. A first pressure switch is configured to actuate at a first combustion pressure level and is...
8123518 Burner firing rate determination for modulating furnace  
A modulating furnace having a variable rate burner and a controller is operated at a first burner firing rate for a first period of time, and a higher burner firing rate once the first period of...
RE43035 Conveyor oven having an energy management system for a modulated gas flow  
A conveyor oven has a modulating gas valve which raises and lowers the thermal output of a burner that heats the oven. A bypass line passes a minimum amount of gas to prevent the burner from...
8074636 Warm air furnace  
A warm air furnace capable of reliably carrying out a fuel consumption conserving operation regardless of a heating load is equipped with an ecology operation setting unit for setting a saving...
8070481 Combustion blower control for modulating furnace  
A furnace includes a combustion blower and one or more pressure switches. In some cases, the one or more pressure switches may be used to calculate one or more operating points for the combustion...
7985066 Combustion blower control for modulating furnace  
A furnace includes a combustion blower and one or more pressure switches. In some cases, the one or more pressure switches may be used to calculate one or more operating points for the combustion...
7967006 Dual fuel heater  
A dual fuel heater can couple with one of two fuel sources operating at different pressures. The dual fuel heater can have a first fuel line, a second fuel line, a fluid flow controller, and a...
7967007 Heater configured to operate with a first or second fuel  
A heater can be configured to operate with either a first fuel at a first pressure or a second fuel at a second pressure and can include a fluid flow controller. In some embodiments, the fluid...
7878795 Burner ignition controller  
A fuel burner controller and associated method is configured to establish fuel combustion in a fuel burner and to recycle a fuel combustion initiation process when a loss of combustion is detected...
7824177 Combustion apparatus  
Provided is a combustion apparatus that can positively prevent a combustible gas present in the vicinity from catching fire in performing prepurge, which involves exhausting air from a combustion...
7748375 Negative pressure conditioning device with low pressure cut-off  
A pneumatic signal conditioning device may have a first fluid path and a second fluid path. The first fluid path includes a first inlet and a first outlet, and is configured such that the first...
7717702 Direct sidewall vent system  
A direct sidewall vent system between a fuel-burning appliance in a first space and an external atmosphere, through a wall between the first space and external atmosphere. The direct sidewall vent...
7644712 Negative pressure conditioning device and forced air furnace employing same  
A pneumatic signal conditioning device may have a first fluid path and a second fluid path. The first fluid path includes a first inlet and a first outlet, and is configured such that the first...
7607426 Dual fuel heater  
In certain embodiments, a dual fuel heater has a pressure regulating device for selectively coupling with a first source or a second source operating at different pressures. The dual fuel heater...
7553151 Timer relay control board  
A heater (12) includes a burner (16), a valve (20), and an inducer (18). A thermostat (24) is electrically coupled to the heater (12) and a control board (44) is disposed in the heater (12) and...
7494337 Apparatus and method for providing multiple stages of fuel  
The present invention provides an apparatus and method for providing multiple stages of fuel. A burner assembly having a face for production of a flame and a plurality of longitudinally adjacent...
7455238 Control system and method for multistage air conditioning system  
A controller and method for operating an HVAC system including an air conditioning unit, such as a gas furnace, having three stages of heat output and responsive to signals from a single stage or...
7360534 Heated replacement air system for commercial applications  
Apparatus and a method for providing heated replacement air to a paint spray booth or other commercial process which requires heated make-up air to replace exhausted air. A blower draws outside...
7296426 Interactive control system for an HVAC system  
An interactive system for controlling the operation of an HVAC system is provide that comprises a thermostat for initiating the operation of the HVAC system in either a full capacity mode of...
7195010 Space heater  
Disclosed is a space heater, with an air cleaning function, that monitors combustion at a burner, and prevents the halting of combustion due to the erroneous detection of a combustion abnormality....
7123020 System and method of fault detection in a warm air furnace  
A fault detection system and method for a warm air furnace is provided. A sensing circuit connected to an AC power source measures a level of current consumption during several points in the warm...
7101172 Apparatus and methods for variable furnace control  
A furnace control system for controlling a gas-fired induced-draft furnace having a variable speed inducer blower. A control apparatus, responsive to a signal corresponding to the magnitude of a...
6925999 Multistage warm air furnace with single stage thermostat and return air sensor and method of operating same  
A multistage furnace for heating residential or commercial spaces is operated by a single stage thermostat and a return air temperature sensor providing sensed temperature information to a...
6880549 Combustion system for a heater  
A combustion system for a portable forced air heater having two frusta-conical sections attached to a circular burner tube, wherein each frusta-conical section has pre-determined vent hole...
6786225 Three-stage relay control  
A three-stage relay control is provided for regulating the flow of gas through, for example, gas valves. The relay control includes a control arm for providing three levels of gas flow and having...
6758208 Flexible gas-fired heat exchanger system  
A compact, highly flexible and efficient, multi-positionable, multi-dimensional and multi-stage gas-fired heat exchanger system as described. The system is connectable in a forced air duct...
6736634 NOx reduction with a combination of radiation baffle and catalytic device  
In a fuel gas burner, a reduction of NOx emissions is brought about by the combined use of both a catalyst and a radiation baffle. The catalyst and baffle are located in serial flow relationship...
6684875 Conveyor oven with modulated gas flow  
An automatic oven cooks or bakes a food product over a timed period of time during which a burner delivers heat to the oven cavity. Thermocouple sensors in the cavity control a modulator which...

Matches 1 - 50 out of 175 1 2 3 4 >