Matches 1 - 50 out of 76 1 2 >
Match Document Document Title
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...
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,...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
4421268 Integrated control system using a microprocessor  
An integrated control system for a temperature conditioning apparatus which contains a microprocessor which is connected to the various components of a control system of the temperature...
4417688 Temperature control system for vehicle passenger compartment  
The heat exchanger of the temperature control system for a vehicle passenger compartment exchanges heat with air entering the passenger compartment. The flow of heat-exchange medium through the...
4410131 Heating and air conditioning system  
A heating system for an inhabitable enclosure having a first heating system that maintains a first temperature in the absence of persons in the enclosure and a second heating system that maintains...
4401261 Flue gas heat recovery apparatus  
A flue gas heat recovery apparatus is employed with a system of appliances such as a gas furnace and hot water heater, each having separate exhaust gas flues. The apparatus includes a gas-to-liquid...
4383640 Heat control device for a wood or coal burning stove  
A heat control device for a stove which burns solid fuel and in which the heat output of fuel combustion is regulated in order to control within preselected temperature ranges the temperature of...
4382543 Acoustic control for zone heat control system  
Thermostatically controlled valves and acoustic transducers are energized by thermostats in individual zoned heated areas of a structure. The thermostatic valves or dampers permit heated fluid to...
4337893 Multi-phase modular comfort controlled heating system  
A circulating fluid that is heated by a number of gas-fired burner assemblies is used to heat a space either through a hot water system or a forced air heating system. Each burner assembly includes...
4308990 Flue gas heat recovery system  
A flue gas heat recovery system includes a heat exchanger fluidly interposed between a furnace and a chimney to receive hot flue gas from the furnace. The heat exchanger is releasably mounted in...
4240579 Thermostatically controlled heating system  
Efficiency of domestic heating systems is improved by a flue temperature responsive switch for intermittently shutting down the burner when temperature conditions are such as would cause extended...
4132353 Window heaters  
A thermostat controlled window furnace for heating a room features a construction wherein the air required for its operation is comprised on the one hand of outside air used solely for combustion...
4090663 Fan control for forced air temperature conditioning apparatus  
An improved fan controller for forced-air temperature conditioning apparatus for buildings, such as for example, forced warm air furnaces in which the fan turn-off is controlled as a function of...
4079885 Apparatus and method of utilizing waste heat from furnace combustion  
This invention pertains to apparatus and a method for utilizing waste heat as produced in furnaces, particularly boilers. This apparatus and method is equally useful in hot air furnaces. After...
4030479 Solid fuel heater with blowback prevention means  
A solid fuel burning heater has an inner combustion chamber housing enclosed within an outer housing with a fuel feed door in the inner combustion chamber housing being aligned with an outer...
3644075 FAIL SAFE ELECTRONIC-CONTROL SYSTEM  
A system for maintaining a control device electrically energized only in response to the occurrence of a predetermined condition and for preventing energization of the control device in the absence...
3603504 CONTROL FOR DIRECT GAS FIRED MAKEUP AIR HEATING  
A control system for use on direct-fired makeup air heating systems utilizing a pilot-operated modulating valve providing a system which is rapid in response and in which hunting is minimized.
3584988 ELECTROTHERMAL FURNACE CONTROL  
Apparatus for controlling the operation of a furnace having an electrically energizable fuel valve which, when energized, supplies fuel to the furnace burner. An ignition circuit generates...
3494551 FURNACE CONTROL SYSTEM  
3474961 SPEED CONTROL FOR BLOWER IN FORCED AIR SYSTEM USED FOR HEATING  
3454078 CONTROL FOR BLOWER MOTOR OF FURNACE AND AIR CONDITIONER  
Matches 1 - 50 out of 76 1 2 >