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| Number | Title | Issue Date |
| 7334632 | Variable volumetric flow heat exchanger for an air-to-air heat recovery system A variable volumetric flow heat exchanger for a building air-to-air heat recovery system that is operable at a high volumetric flow rate and at a low volumetric flow rate. The heat exchanger includes multiple heat exchange banks, including at least one continuous du... | 02/26/2008 |
| 7261241 | Heating and cooling energy saving device A system for regulating the temperature of multiple areas within a facility using multiple energy savings devices (ESD) that each regulate the temperature of individual rooms or areas within a facility having a central heating and cooling plant. The device includes ... | 08/28/2007 |
| 7234312 | Variable speed, electronically controlled, room air conditioner A variable speed air handling system for cooling and/or heating a room including a sleep mode. The system includes a fan assembly to transport air from the system into the room, the fan assembly having a substantially continuously adjustable speed within a range of ... | 06/26/2007 |
| 7225054 | Controller with programmable service event display mode Controllers and systems for displaying servicing information via a display unit are disclosed. A controller in accordance with an illustrative embodiment of the present invention may include an interface for programming a service event display mode in the controller... | 05/29/2007 |
| 7181317 | Controller interface with interview programming A controller and a method of programming a schedule of a controller having a user interface, the schedule having a number of schedule parameters, the method including the steps of: providing one or more interview questions to a user via the user interface; accepting... | 02/20/2007 |
| 7114554 | Controller interface with multiple day programming A controller equipped with a user interface having multiple-day programming capabilities, including methods of programming such devices, are disclosed. The user interface may include one or more menus or screens that can be used to program a schedule for one or more... | 10/03/2006 |
| 7063140 | Multiple climate air system The present invention 10 discloses a climate control system for a dwelling 12 comprised of main air conditioning unit 36 and a plurality of thermostats 14 and vents 16. Each of the thermostats 14 is positioned within a zone ... | 06/20/2006 |
| 7017827 | Method and system for automatically optimizing zone duct damper positions A control is functional to perform a method of determining a maximum desired airflow for each of a plurality of zones in a multi-zone HVAC system, and an expected airflow to those zones. In part, these determinations are based upon an algorithm that calculates the r... | 03/28/2006 |
| 7003377 | Controlling cooling air intake for air cooled equipment A method and apparatus for supplying cooling air to electronic equipment from ones of at least two sources. A detector detects whether the quality, such as the temperature of the cooling air from a source, is satisfactory and if not shuts the damper to that source a... | 02/21/2006 |
| 6997389 | Method and apparatus for delivering conditioned air using pulse modulation A method and apparatus for delivering conditioned air using short duty cycles during which a damper is fully open for a time and fully closed for the remaining time. Conditioned air is continuously supplied to a plenum at low pressure and is applied to the space whe... | 02/14/2006 |
| 6951306 | Thermostat having multiple mounting configurations The invention is directed to temperature control system in which a temperature control apparatus for controlling the operation of at least one temperature-modifying device may include a thermostat housing; a controller to control the operation of the temperature mod... | 10/04/2005 |
| 6929062 | Air-conditioning apparatus An air-conditioning apparatus regulates at least the temperature of at least one room to a predetermined temperature desired value (TRAUM SOLL) by ventilation with heated or cooled supply air. The air-conditioning apparatus has a supply air motor (15 | 08/16/2005 |
| 6915650 | Vehicle air conditioner with automatic control of main blower and sub-blower A vehicle air conditioner includes a main blower and a sub-blower for blowing air into a passenger compartment. The main blower is disposed to blow conditioned air in a front air passage toward a front seat area in the passenger compartment, and the sub-blower is di... | 07/12/2005 |
| 6879881 | Variable air volume system including BTU control function A method, as well as a controller, for controlling room temperature with a variable air volume system having a plurality of zones wherein the thermal transfer rate with respect to each of such zones is maintained at a substantially constant value notwithstanding cha... | 04/12/2005 |
| 6792766 | Zone demand controlled dual air conditioning system and controller therefor A thermal zone demand controlled air conditioning fan coil unit using dual cascade arranged heat pumps, chilled water, or a combination of chilled water and hot water, with or without back up electric resistance heat strips, and having an air circulation system for ... | 09/21/2004 |
| 6789618 | Energy recycling air handling system An air handling system including at least one terminal unit for maintaining a serviced volume at a predetermined temperature below the temperature of the air supplied by the central source of the air handling system is provided through the use of a refrigerant means... | 09/14/2004 |
| 6725914 | Double duct changeover HVAC system The invention is a double duct changeover HVAC system, which uses two conditioned air sources to deliver air into two main duct systems. The two main duct systems are routed toward the exterior exposures of a building, and converge into a single duct which is routed... | 04/27/2004 |
| 6719625 | Method and apparatus for controlling variable air volume supply fans in heating, ventilating, and air-conditioning systems A control strategy for supply fans in variable-air-volume heating, ventilating, and air-conditioning systems that reduces the static pressure at part-load conditions. The invention consists of a static pressure sensor, an airflow sensor, a supply fan, a fan modulati... | 04/13/2004 |
| 6688384 | Heating and cooling energy saving device An energy savings device (ESD) for regulating the temperature of individual rooms or areas within a facility having a central heating and cooling plant. The device includes a fan and thermostats to control the temperature in each room. A first thermostat ... | 02/10/2004 |
| 6634422 | Method for controlling an economizer A method of controlling an economizer is provided. A heating, ventilating, and air conditioning unit is operated in one of a heating mode and a cooling mode to provide conditioned air to a plurality of zones. A first temperature representative of air retu... | 10/21/2003 |
| 6604688 | Air handler with return air bypass for improved dehumidification A VAV air handler includes a cooling coil with a return air bypass damper for improved dehumidification. The bypass interjects into the supply air a portion of relatively warm, dry return air downstream of the cooling coil. This allows the cooling coil to... | 08/12/2003 |
| 6364211 | Wireless damper and duct fan system A temperature regulating apparatus comprising, an airflow rate controller to increase or decrease the flow of air supplied from a central heating ventilation and air conditioning system exiting a duct into a selected area, a portable programmable thermost... | 04/02/2002 |
| 6338437 | Process and apparatus for individual adjustment of the temperature set points of a plurality of VAV devices through a network server An apparatus and process for individual adjustment of the temperature set points of a plurality of VAV devices (27, 29) in an HVAC system. The process includes the step of directly, or indirectly through a network server (61), coupling each of a plurality... | 01/15/2002 |
| 6298912 | Method and system for controlling an economizer A method and system for controlling the temperature of air returned to a conditioning unit in a zoned system is disclosed. The system includes a heating, ventilating, and air conditioning (HVAC) unit that has an economizer. The HVAC unit is connected to a... | 10/09/2001 |
| 6250560 | Variable-air-volume diffuser actuator assembly and method An adaptive control device (77) and method (102-108) for control of the operation of an actuator (72), and particularly thermally-powered actuator (72) of the type used in a variable-air-volume diffuser (71). The preferred adaptive control device is an ex... | 06/26/2001 |
| 6220518 | Process and apparatus for individual adjustment of the temperature set points of a plurality of VAV devices An apparatus and process for individual adjustment of the temperature set points of a plurality of VAV devices (27, 29) in an HVAC system. The process includes the step of coupling each of a plurality of computers (34) located in a plurality of offices or... | 04/24/2001 |
| 6196469 | Energy recycling air handling system An air handling system including at least one terminal unit for maintaining a serviced volume at a predetermined temperature with constant or variable volume control wherein a thermal energy wheel provides heat transfer between the outgoing and inflowing ... | 03/06/2001 |
| 6095426 | Room temperature control apparatus having feedforward and feedback control and method A controller for heating, ventilating and air-conditioning distribution systems, which includes feedforward and feedback control strategies. The controller has a feedforward control strategy that generates a control signal based on control set points and ... | 08/01/2000 |
| 6000232 | Refrigeration system and method of control A refrigeration system is disclosed in which temperature regulation and energy efficiency are improved. Each compartment to be cooled is provided with a variable speed fan, the speed of which is controlled dependent on that compartment's temperature, the ... | 12/14/1999 |
| 5988517 | Method and system for controlling an automotive HVAC system based on the principle of HVAC work A method and system for automatically controlling a heating, ventilation and air-conditioning (HVAC) system of a vehicle in order to achieve thermal comfort of an occupant of the automotive vehicle receives a plurality of input signals representative of a... | 11/23/1999 |
| 5971067 | Air quality control system The present invention is a system for controlling the quality of air in a building. The system includes a sensor disposed for sensing the air quality in a building. Upon a sensing of an air quality problem, the system issues a command to draw in additiona... | 10/26/1999 |
| 5944098 | Zone control for HVAC system A control assembly for a HVAC system serving a plurality of zones within a structure, having ducting including a damper situated in an outlet of the ducting leading to each zone, a biasing element biasing the damper in a normally open position, and a moto... | 08/31/1999 |
| 5931227 | Conversion of constant volume heating/air conditioning systems Constant volume multizone heating/air conditioning systems are converted to variable volume air conditioning systems. Energy conservation is achieved by converting the fan drive from one requiring constant volume air flow. Instead, the volume of air flow ... | 08/03/1999 |
| 5927398 | Device identification system for HVAC communication network A system is disclosed for conveying network identifications of HVAC master controllers within an HVAC communication network to their respective zone controllers. Each master controller addresses and transmits its network identification to zone controllers... | 07/27/1999 |
| 5860473 | Multi-zone automatic changeover heating, cooling and ventilating control system A climate control system having a control means for receiving cool call signals and heat call signals from a plurality of thermostats. The control means blocking action by conflicting calls when the system is in a heat mode or cool mode. The system also p... | 01/19/1999 |
| 5829674 | Zone system control A device and method for controlling the conditioning of air in the zones of a forced air HVAC system. The device comprises thermostats located in at least two different zones, air ducts and dampers located therein to control the flow of air to the differe... | 11/03/1998 |
| 5769314 | Variable air volume HVAC system controller and method A variable air volume heating, ventilation and air conditioning (HVAC) system controller with adaptive control architecture adjusts control parameters to provide for increased direct expansion coil air flow and reduced compressor cycling. The supply air t... | 06/23/1998 |
| 5769315 | Pressure dependent variable air volume control strategy A control strategy for rejecting supply air temperature disturbances in variable air volume air conditioning units using staged DX cooling. The strategy, and corresponding system, minimizes supply air temperature disturbances by controlling zone air dampe... | 06/23/1998 |
| 5725148 | Individual workspace environmental control In building environmental control, primary HVAC services are supplemented to improve individual user comfort by automatically adjusting lighting levels and airflow direction mix in the individual workspace. An individual terminal unit provides these indiv... | 03/10/1998 |
| 5701750 | Zone demand controlled dual heat pump system and controller therefor A thermal zone demand controlled dual cascade arranged heat pump system and system controller for building spaces, having first and second heat pumps and having an air circulation system for circulating air to and from said thermal zones and including a c... | 12/30/1997 |
