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| Number | Title | Issue Date |
| 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 connected to the first input. A second pressure switch is configured to... | 04/03/2012 |
| 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 operation function and a moderate operation function. The saving operatio... | 12/13/2011 |
| 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 flow controller is configured to permit flow of fuel to a first passagewa... | 06/28/2011 |
| 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 combustion chamber. The fluid flow controller can selectively permit flow... | 06/28/2011 |
| 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 outlet provides a first conditioned signal representing a pressure at th... | 07/06/2010 |
| 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 outlet provides a first conditioned signal representing a pressure at th... | 01/12/2010 |
| 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 can also include first and second fuel lines, a fluid flow controller, ... | 10/27/2009 |
| 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 air through a filter and an injection chamber prior to delivering the ai... | 04/22/2008 |
| 7331187 | Intelligent thermostat system for monitoring a refrigerant-cycle apparatus A real-time monitoring system that monitors various aspects of the operation of a refrigerant-cycle system is described. In one embodiment, the system includes a processor that measures power provided to the refrigerant-cycle system and that gathers data from one or... | 02/19/2008 |
| 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 operation or at least one reduced capacity mode of operation, and a control... | 11/20/2007 |
| 7246929 | Landscape lightpost with receptacle cavity A landscape lightpost that provides a substantially sealed wire compartment. The lightpost includes a main post, a cap, a housing base, and a housing separator. The housing separator locks onto the housing base to form a locked wire compartment isolated from the gro... | 07/24/2007 |
| 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. According to the present invention, a space heater includes: a heatin... | 03/27/2007 |
| 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 air furnace operating sequence. The measured level of current consumpt... | 10/17/2006 |
| 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 pressure difference between an inlet and outlet of the combustion chamb... | 09/05/2006 |
| 7083408 | Apparatus and method for shutting down a fuel fired appliance An apparatus comprising a switch, a fuse, and a sensor that is capable of detecting the presence of flammable vapors and responsively changing in resistance, wherein the sensor enables the switch to supply current to the fuse which opens to shut down an appliance bu... | 08/01/2006 |
| 7048537 | Apparatus and method for controlling a variable fuel fired appliance An apparatus is provided for controlling a fuel fired heating appliance, the apparatus comprising a first processor for controlling the ignition operation of the furnace and a second processor for controlling the operation of a variable speed blower motor, wherein t... | 05/23/2006 |
| 7033165 | Gas furnace controller A gas furnace controller for disrupting the flow of gas to a gas furnace upon detection of excessive levels of carbon monoxide comprises an air sample collector in fluid communication with a carbon monoxide detector, a gas supply shutoff circuit for controlling a va... | 04/25/2006 |
| 7021925 | Safety module for fuel-burning appliance, and appliance using such a module The invention provides a safety module for connection to a fuel-burning appliance. The safety module connects to the existing circuitry of the appliance and triggers an alarm response when certain predetermined conditions are met. The safety module includes a CO sen... | 04/04/2006 |
| 7016742 | Decision support for operations and maintenance (DSOM) system A method for minimizing the life cycle cost of processes such as heating a building. The method utilizes sensors to monitor various pieces of equipment used in the process, for example, boilers, turbines, and the like. The method then performs the steps of identifyi... | 03/21/2006 |
| 6971871 | Variable low intensity infrared heater A radiant heater including a burner having an inlet for receiving an air and gas mixture and an exhaust for emitting exhaust gases generated by combustion of the air and gas mixture within the burner, an elongated radiant heating tube having an inlet for receiving t... | 12/06/2005 |
| 6932080 | Arrangement of burner and heat exchanger, and air-heating apparatus Arrangement of a burner (2) and a heat exchanger (1), the heat exchanger (1) including a plurality of heat exchange elements (3) interconnected to each other with intermediate gaps, the heat exchanger (1) being arranged with an inl... | 08/23/2005 |
| 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 controller. The furnace is started at a first, low firing rate and after a pr... | 08/09/2005 |
| 6917886 | Microflow based differential pressure sensor A differential pressure sensor based on pressure induced micro-flow that includes two connecting hoses that are considered when the pressure sensor is calibrated. The inventive differential pressure sensor includes a flexible hose as part of the device itself, and i... | 07/12/2005 |
| 6910496 | Gas conversion assembly A gas conversion assembly generally has a gas inlet and a gas outlet. The assembly includes a control mechanism for regulating the flow of gas from the inlet to the outlet. The control mechanism is constructed and arranged to adjust from regulating the flow of a fir... | 06/28/2005 |
| 6908300 | Apparatus and method for shutting down a fuel fired appliance An apparatus comprising a switch, a fuse, and a sensor that is capable of detecting the presence of flammable vapors and responsively changing in resistance, wherein the sensor enables the switch to supply current to the fuse which opens to shut down an appliance bu... | 06/21/2005 |
| 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 patterns that allow the gas heater to have a variable burn rate. ... | 04/19/2005 |
| 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 three adjustment screws, one for controlling the flow at each stage of... | 09/07/2004 |
| 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 regardless of the angular position and size of the duct. The heat exchanger c... | 07/06/2004 |
| 6749423 | System and methods for modulating gas input to a gas burner An improved gas appliance having a burner, a gas valve through which the flow of combustion gas to the burner is controlled, and a motor driven blower that supplies combustion air to the burner. The improvement includes means for increasing gas flow through the gas ... | 06/15/2004 |
| 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 such that each contributes to the NOx reduction f... | 05/18/2004 |
| 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 regulates the amount of gas flowing to the burner to maintain ... | 02/03/2004 |
| 6681760 | Direct-fired 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 patterns that allow the gas heater to have a variable burn rate.... | 01/27/2004 |
| 6609904 | Gas furnace control arrangement A gas furnace control arrangement includes a control unit control unit and an operating unit adapted to control the control unit, the control unit having a valve seat holding a set of solenoid valves, the solenoid valves including a main valve for fuel ga... | 08/26/2003 |
| 6595201 | Safeguard for furnace draft system A draft safeguard apparatus for use in a multi-poised furnace having an inducer housing for receiving flue gases from a heat exchanger. The furnace flue pipe is attached to the inducer housing by an elbow that is rotatably connected to the inducer housing... | 07/22/2003 |
| 6484951 | Thermostat with carbon monoxide warning feature A thermostat comprising an audible alarm or LCD, and sensing means for sensing at least one signal from at least one external carbon monoxide detector. The thermostat is configured to change the temperature setting to 50° F., and to trigger the audible a... | 11/26/2002 |
| 6485294 | NOx reduction device In a gas-burning apparatus, such as a furnace, a device for reducing NOx emissions includes a cup member mounted proximate to an inlet to a combustion chamber of the apparatus and a perforate member attached to the cup member and located in the combustion... | 11/26/2002 |
| 6481433 | 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 completely shutting down during periods while the oven remains a... | 11/19/2002 |
| 6474328 | Heater unit A heater unit for air handling equipment comprises a peripheral frame 2 across which a plurality of heater tubes 12 extend. The heater tubes 12 have reverse bends, and each extends from an inlet end 6 and an exhaust end 8 disposed on the same side 10 of t... | 11/05/2002 |
| 6401708 | Pressure sensing device in gas furnace and method for controlling operation thereof Pressure sensing device in a gas furnace including a first tube in communication with a position of an air supply pipe on an inlet side of an air supply fan having a pressure identical to an inlet of the air supply fan, a second tube in communication with... | 06/11/2002 |
| 6390806 | Pneumatic system for flame rollout and draft safeguard protection A furnace is provided with a flame rollout protection system which operates through an existing excess-air control pneumatic circuitry to shut down the furnace in the event of a flame rollout condition. A fusible tube is attached at its one end to the pne... | 05/21/2002 |
