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| Number | Title | Issue Date |
| 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 |
| 7252502 | Method and system for combined standing pilot safety and temperature setting The method and apparatus provides a controller (which might comprise a microprocessor) that can control gas flow to a pilot burner in fluid communication with a manual pilot valve and an automatic pilot valve. The exemplary embodiments can comprise a selectable inpu... | 08/07/2007 |
| 5918803 | Power regulating system for the burner of a heater A power regulating system make it possible to switch on a plurality of power stages with different air flow rates and different fuel flow rates on the burner of the heater. In addition, noise level is optimized, since the blower that maintains the air flo... | 07/06/1999 |
| 5713515 | Method and system in a fluid heating apparatus for efficiently controlling combustion In a fluid heating apparatus having a fluid tank, a combustion chamber communicating with the fluid tank for heat exchange, and a combustible fluid delivery system coupled to the combustion chamber, a plurality of valves are individually configured in eit... | 02/03/1998 |
| 5119884 | Multiple stage electronic temperature control for heating and cooling A control device for energizing and de-energizing temperature changing devices having a primary control unit and a secondary control unit is provided. The primary control unit includes means for sensing an external temperature and generating a signal (Ps)... | 06/09/1992 |
| 5042431 | Multiple boiler control system and method of operation A multiple-boiler heating system is disclosed in which each boiler or stage is provided with an adjustable firing level of modulation at which the boiler is turned on and an adjustable threshold level of modulation (the MOD point), below which the next st... | 08/27/1991 |
| 4976459 | Warmup method for a two stage furnace The present invention involves a two stage furnace and a method of warming its heat exchanger. The furnace includes a gas valve with low and high combustion settings, and inducer and circulator fans with low and high speed settings. When a call for heat i... | 12/11/1990 |
| 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 |
| 4886110 | HVAC zone control system An HVAC system for a plurality of zones comprising an air handling unit including a blower, a plurality of heating stages and a plurality of cooling stages. The air handling unit is connected via ducts to each of the zones, each zone having an air outlet ... | 12/12/1989 |
| 4850530 | Gas valve using modular construction A gas valve for controlling the flow of a combustible, gaseous fuel to a burner employs a modular construction and is configurable to be fast or slow opening, to be step opening or to provide two firing rates in accordance with external signals applied th... | 07/25/1989 |
| 4789097 | Humidity control apparatus for an area A humidity control apparatus for controlling the humidity level of air within a given area. The apparatus includes a plurality of control valves connected in fluid flow communication to a fluid supply source for injecting water into the air within the are... | 12/06/1988 |
| 4542849 | Method and apparatus for regulating a heating installation in premises including a plurality of heat generators The present invention relates to a method and to apparatus for regulating a heating installation in a premises comprising a plurality of heating generators. The apparatus comprises temperature probes (10, 20, 140) which are sensitive to the outside temper... | 09/24/1985 |
| 4513909 | Fuel burner control system with low fire hole A boiler control utilizing a pressure sensor is provided that operates the system in the low fire mode if the load is light and can be satisfied in that mode. If the low fire operation is inadequate to hold the load, and the pressure drops, the boiler is ... | 04/30/1985 |
| 4513910 | Adaptive low fire hold control system A boiler control utilizing a pressure sensor is provided that operates the system in the low fire mode if the load is light, and can be satisfied in that mode. If the low fire operation is inadequate to hold the load and the pressure drops, the boiler is ... | 04/30/1985 |
| 4425930 | Fluid flow control apparatus and method Apparatus and a method for controlling the flow of a fluid to a fluid-actuated system. The system is controlled by a sensor which senses a variable characteristic of the system, such as the air temperature. The apparatus includes a pair of solenoid valves... | 01/17/1984 |
| 4420113 | Method of and system for controlling the operation of a heater A space heater, designed to maintain the temperature of a room between a lower limit Tm and an upper limit TM, is controlled by a system including a sawtooth-wave generator working by way of a clipping stage into a differential ampli... | 12/13/1983 |
| 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 a housing with a heat exchanger mounted therein and a gas... | 07/06/1982 |
| 4252300 | Burner control system A control system for multiple burners or heaters in an afterburner section of a metal scrap dryer is provided. The control system provides for cascade and sequential control including selective and sequential ignition as well as selective and sequential d... | 02/24/1981 |
| 4199690 | Control system for actuators which can be separately energized and deenergized A control system for actuators which can be separately energized. The controller of the system has a two-position control unit and a three-position control unit and is followed by constant current source circuits, a stepping switch unit with threshold swi... | 04/22/1980 |
| 4168719 | Gas control unit for a burner A gas control device for controlling the gas supply to the burner of a domestic hot water boiler has two main valves arranged in series in the gas flow path so as when closed to define a chamber between them. A second chamber is communicable with this cha... | 09/25/1979 |
| 4140067 | Furnace control system A furnace control system to control burner operation of a multifuel furnace to reduce primary fuel consumption of either oil or gas of the multifuel furnace. The system controls a primary fuel to initially kindle a secondary fuel when the fire reaches a s... | 02/20/1979 |
| 4085921 | Multiple-mode fluid-flow control valve arrangement A fluid-flow control valve arrangement comprising valve means operable in different conditions including variable-flow, constant-flow and zero-flow mode conditions depending upon predetermined ranges of a prescribed operational parameter, the valve arrang... | 04/25/1978 |
| 4034911 | Burner control system A burner control system for a hot water boiler is responsive to both outlet water temperature and return water temperature to provide a relatively constant outlet water temperature regardless of variations in heat output requirements. A first thermistor r... | 07/12/1977 |
| 4019679 | Thermostatically controlled heating arrangement including a heat pump A heating arrangement, in which the circulating heat transfer medium for radiators is heated by condensation of a refrigerant in a heat pump, is controlled by relays in the energizing circuits of the several, independently driven pumping units of the comp... | 04/26/1977 |
| 3999934 | Start up circuit In a thermostat control system including means for modulating the fuel flow to a burner above a predetermined level necessary for combustion, the improvement comprising an ignition circuit adapted to provide a larger fuel flow initially to the burner incl... | 12/28/1976 |
| 3964466 | Parallel fluid heating system A parallel water heating system having a plurality of water heaters supplying heated water to a plurality of water consuming loads. The water consuming outlet conduit from each of the water heaters includes a temperature responsive control valve that cont... | 06/22/1976 |
