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| Number | Title | Issue Date |
| 7575178 | Heat recovery apparatus An apparatus for extracting heat from a heat source comprising a housing having a first end with a first opening and a second end with a second opening. The housing includes an internal compartment therein and the first end of the housing is connected to said heat s... | 08/18/2009 |
| 7385863 | Semiconductor memory device A semiconductor memory device enabling efficient repair of defects by using limited redundant memory while suppressing a drop of access speed accompanied with the repair of defects of the memory, wherein a first memory array is divided into a plurality of memory reg... | 06/10/2008 |
| 7311624 | Apparatus for controlling speed of a water pump For enhancement of heating performance of a vehicle, operating speed of a water pump of an engine is varied in accordance with engine operation conditions, so a speed of a coolant temperature increase can be accelerated when needed. ... | 12/25/2007 |
| 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 |
| 7282887 | Laser diode triggered soft start controller for a polyphase electric motor A solid state soft start controller system has a power supply, an electric motor, a thyristor electrically interconnected between the power supply and the electric motor so as to selectively allow current to pass from the power supply to the phases of the electric m... | 10/16/2007 |
| 7066170 | Apparatuses and methods for balancing combustion air and exhaust gas for use with a direct-vent heater appliance A combustion air and exhaust gas balancing system for use with a direct-vent heater appliance. The balancing system includes a combustion air valve in fluid communication with a combustion air duct and an exhaust gas valve in fluid communication with an exhaust gas ... | 06/27/2006 |
| 6941680 | Cost-efficient clothes dryer A clothes dryer that is operatively attached to a heating system is illustrated. The clothes dryer receives heated fluid when the dryer is turned on. The dryer has a radiator that receives the heated fluid from the circulating fluid flow system. The fluid-filled rad... | 09/13/2005 |
| 6886754 | Thermostat operable from various power sources A thermostat is operable from battery, common-wire (“C-wire”), or furnace relay power. The thermostat includes a power source selector, such as a jumper wire, that is set when the thermostat is installed in a heating system. In a gas millivolt heating system, th... | 05/03/2005 |
| 6637667 | Method and apparatus for energy recovery in an environmental control system Control apparatus for an environmental control system comprises input circuitry receiving environmental information and output circuitry for controlling an HVAC system. Processing circuitry in the controller configures the output circuitry based at least ... | 10/28/2003 |
| 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 |
| 6360955 | Method and means for automated variable heater control for agricultural unit heaters A space heater for the interior of a building has a support enclosure containing a gas burner and a gas conduit connecting the burner to a source of combustible gas. An electronically controlled proportional valve is located in the gas conduit. A fan and ... | 03/26/2002 |
| 6109531 | High reliability heating system A high reliability heating system that includes dual furnace control mechanisms wherein each furnace control mechanism includes blowers and control elements and each is independently operable to control the operation of a shared furnace burner unit and he... | 08/29/2000 |
| 5971284 | Apparatus for regulating heater cycles to improve forced-air heating system efficiency A method and apparatus of regulating cycles of a burner in a forced air heating system. A control unit uses a sensor at an output of a heat exchanger to make measurements of a temperature of air output from the heat exchanger. The control unit observes te... | 10/26/1999 |
| 5729474 | Method of anticipating potential HVAC failure To anticipate potential failure of a temperature modification device (e.g., heating, ventilating and air conditioning equipment used in a commercial building), an efficiency value representing the ability of the temperature modification device to change t... | 03/17/1998 |
| 5666889 | Apparatus and method for furnace combustion control Furnace combustion in a multi-stage or variable input furnace is controlled by operating the furnace in a high fire mode at furnace start-up until the temperature of the products of combustion, or a temperature corresponding to the products of combustion,... | 09/16/1997 |
| 5616995 | Systems and methods for controlling a draft inducer for a furnace Systems and methods for controlling a draft inducer for use with a furnace. The draft inducer includes a fan for moving combustion chamber gases for inducing a draft in the furnace combustion chamber that causes a pressure drop across a heat exchanger. Th... | 04/01/1997 |
| 5522541 | Method for proving furnace high-heat pressure switch In a two-stage furnace system, including a thermostat, at least one gas burner with a low and high-fire operating capability, an inducer fan having low and high speed operating settings, and a high-fire pressure switch, a method for handling the high-fire... | 06/04/1996 |
| 5520327 | Electronic thermostat having safety feature An electronic thermostat having a safety feature includes a controller which sends control signals to circuitry used for activating a system for conditioning air. The control signals are used to control the active state of the system for conditioning air.... | 05/28/1996 |
| 5467920 | Thermostat with adjustment for the cycling rate of the heating plant An electromechanical thermostat has a fixed value voltage anticipator resistor and a variable anticipator resistor for series connection with the load. This allows a single thermostat to control either a high efficiency furnace requiring a relatively low ... | 11/21/1995 |
| 5340028 | Adaptive microprocessor control system and method for providing high and low heating modes in a furnace A method for providing a low fire mode and a high fire mode of a heating cycle in a current cycle of a furnace as a function of the previous heating cycle wherein the current heating cycle is a function exclusively of time run in low fire mode and time ru... | 08/23/1994 |
| 5337952 | Adaptive microprocessor control system and method for providing multiple heating modes in twinned furnaces In a heating system containing twinned furnaces capable of independently operating at multiple levels, a method for providing multiple heating modes to satisfy a required heating load during a given cycle, there being some total number of heating modes, w... | 08/16/1994 |
| 5226590 | Adaptor for mounting temperature sensitive duty cycling control with flexible duct work An adaptor is designed to mount a duty cycling control switch for a furnace or air conditioning system which has flexible duct work. The adaptor includes two opposite cylindrical sections with a central section which includes an arcuate portion and a plan... | 07/13/1993 |
| 5092518 | Hot-air type heater Provided is a hot-air type heater including a heat generating means such as a burner heater from which hot air is produced and blown out the heater into a living room so as to warm up the inside of the room with a uniform temperature distribution even amo... | 03/03/1992 |
| 4896828 | Solid state emergency heat circuit An emergency heat circuit for a microprocessor-controlled furnace has a first emergency heat switch with one terminal in contact with a rectifier circuit that provides a DC voltage when the thermostat calls for heat, and another terminal connected to an e... | 01/30/1990 |
| 4887767 | Limit switch control method for a two-stage furnace A two-stage gas furnace control system automatically shifts into a high fire only mode if, in two consecutive low fire heating cycles a limit switch is tripped to indicate that a gas valve is stuck in a high fire condition. In this way, continued operatio... | 12/19/1989 |
| 4817862 | Control apparatus Control apparatus for controlling the operation of a gas valve in a gas heating system which includes thermostatic switch means and a source of AC voltage which are connected to form a series circuit with the gas valve is disclosed. The control apparatus ... | 04/04/1989 |
| 4712733 | Internally mounted duty cycling control A heating system and air conditioning system incorporating a duty cycling control switch are disclosed. The duty cycling control switch for either the furnace or air conditioning system is mounted within the supply side duct of the system, i.e., the hot a... | 12/15/1987 |
| 4706881 | Self-correcting microprocessor control system and method for a furnace A self-correcting control system and method is provided for a furnace to correct certain operating conditions that exceed normal limits. Upon sensing insufficient air flow as a function of the pressure drop across the heat exchangers, the control system a... | 11/17/1987 |
| 4698574 | Process control apparatus When an output from a sensor (11) is decreased below a key-lock release preset value (K), a comparator (19) generates an output so as to reset a flip-flop (21) and to enable an AND gate (22). When the output from the sensor (11) is decreased below a reset... | 10/06/1987 |
| 4676433 | Regulating means for controlling the supply of heat to a confined space, and means for establishing when the heating requirement of an air mass exceeds a pre-determined value, and by how much A regulating arrangement intended for supplying heat to a confined space, including a heating source (13), a regulating means (12) intended for regulated heat supply from the heating source, a device for detecting one or a plurality of measurement values ... | 06/30/1987 |
| 4667874 | Energy saving furnace controller An auxiliary heating/cooling system controller is connected in series between the household thermostat and the furnace burner valve and compressor. The controller includes a timing control which is responsive to a preset time interval valve and the plenum... | 05/26/1987 |
| 4664311 | Mounting for duty cycle control switch for ceiling mounted ductless heater A temperature sensitive duty cycling control switch is mounted to a forced air ductless gas or oil heater by a special mounting bracket. The bracket attaches to the front of the heater in the path of the heated airflow. The mounting device is basically a ... | 05/12/1987 |
| 4646962 | Rotational means for automatic damper means Damper means having rotatable closure means mounted in a housing placed in the flow stream of a heating/cooling medium to regulate and control the medium being transported through duct means of a heating/cooling device; said closure means being operated b... | 03/03/1987 |
| 4638942 | Adaptive microprocessor control system and method for providing high and low heating modes in a furnace An adaptive microprocessor control system and method provide a low heat mode and a high heat mode of a heating cycle in a furnace dependent upon the performance of the previous heating cycle. The duration of the low heat mode and subsequent high heat mode... | 01/27/1987 |
| 4632303 | Electronic thermostat with switched power converter An electronic thermostat utilizing a switched power supply which operates either from a voltage appearing across an open circuit at a heater or air conditioner activation circuit (de-energized state) or from a current flowing in the activation circuit upo... | 12/30/1986 |
| 4629113 | Furnace controller A device for augmenting the control of a forced air furnace includes a heat probe which is located in association with a furnace heat exchanger so as to sense the air temperature of air passing across the heat exchanger. The probe is connected via a buffe... | 12/16/1986 |
| 4541561 | Heating equipment and method of operating same The heating equipment includes an auxiliary heating apparatus having a space heater mounted within an air recirculating furnace system for heating air therein. A thermostat responds to a first predetermined ambient temperature to activate the space heater... | 09/17/1985 |
| 4477019 | Flue gas heat recovery apparatus for a forced air home heating system A flue gas heat recovery apparatus for a forced air type furnace of the type having a furnace heat exchanger, a return air duct and a heated air duct, and a blower for passing air from the return air duct over the furnace heat exchanger to the heated air ... | 10/16/1984 |
| 4470542 | Single closed loop fireplace home heating system A home heating system which transfers heat generated in a fireplace, throughout the home using the duct work and furnace fan already installed in a home, having a natural gas fired forced air furnace; said home heating system being an inexpensive, simple ... | 09/11/1984 |
| 4424934 | Hot water heating system A hot water heating system wherein an air-to-water heat exchanger is attached to the outside of a jacketed space heater, and a fan draws hot air through an opening in the jacket and downward through the heat exchanger.... | 01/10/1984 |
