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| Number | Title | Issue Date |
| 8179157 | Setup and method for testing a permanent magnet motor A test setup for a permanent magnet motor provides a method for identifying symmetry or asymmetry in the magnetic fields of the motor's permanent magnets. The setup comprises a test circuit that includes a fixed reference node that provides a stable reference to whi... | 05/15/2012 |
| 8132420 | Variable evaporator water flow compensation for leaving water temperature control A method of controlling a refrigerant chiller system is particularly suited for chillers where the water being chilled (or some other liquid) flows through the chiller's evaporator at a flow rate that is variable and is not directly known. To effectively control the... | 03/13/2012 |
| 8096141 | Superheat control by pressure ratio A control method regulates an electronic expansion valve of a chiller to maintain the refrigerant leaving a DX evaporator at a desired or target superheat that is minimally above saturation. The expansion valve is controlled to convey a desired mass flow rate, where... | 01/17/2012 |
| 8011196 | Refrigerant control of a heat-recovery chiller A chiller includes a main condenser that has a refrigerant condensate sump with an internal weir or standpipe that maintains at least a minimum liquid seal between the outlets of the main condenser and a heat-recovery condenser. The main condenser is used for normal... | 09/06/2011 |
| 7980087 | Refrigerant reheat circuit and charge control with target subcooling A refrigerant system for cooling a comfort zone is selectively operable in a cooling-only mode and a reheat mode. The system operates in the cooling mode to meet sensible and latent cooling demands of a room or area in a building when the room temperature is appreci... | 07/19/2011 |
| 7975495 | Control scheme for coordinating variable capacity components of a refrigerant system A refrigerant system adjusts, in a coordinated prioritized manner, the variable capacities of a compressor, evaporator fan and a condenser fan to minimize the system's overall power consumption while maintaining a comfort zone within a target comfort range. The targ... | 07/12/2011 |
| 7922467 | System for protecting bearings and seals of a refrigerant compressor To protect the bearings, lubricant and seals of a refrigerant compressor, the compressor includes one or more inductors for mitigating a high frequency common mode current that produces a high frequency shaft voltage. Each inductor is a ring of magnetic material enc... | 04/12/2011 |
| 7874724 | Method for sensing the liquid level in a compressor Two vertically offset thermistors for sensing a fluid such as oil and refrigerant in a compressor shell are monitored by a method that takes into account rapidly changing conditions within the shell. The system can determine the fluid's sump temperature, high/low li... | 01/25/2011 |
| 7819644 | Scroll compressor with crankshaft venting Lubrication of bearing surfaces in a scroll compressor is enhanced by a vent arrangement which makes use of increased centrifugal force, achieved by locating the outlet of the vent arrangement radially outside of the nominal circumference of the compressor's drive s... | 10/26/2010 |
| 7802615 | Sound attenuating shield for an electric heater A sound-abating flow disruptor quiets a PTAC refrigerant system by disturbing the airflow between an energized electric heater and an adjacent fan wheel. In some embodiments, the flow disruptor is a perforated metal plate that attenuates a whistle, which appears to ... | 09/28/2010 |
| 7793513 | Configurable PTAC controller with alternate temperature sensors A refrigerant PTAC system, such as those commonly found in hotel rooms, can be selectively configured in a hardwire or wireless configuration with respect to its thermostat. The system is controlled in response to the better of two temperature sensors, which is dete... | 09/14/2010 |
| 7775057 | Operational limit to avoid liquid refrigerant carryover A refrigerant system comprising a compressor, a condenser, an electronic expansion valve, and an evaporator is controlled in a normal operating mode to meet moderate cooling loads; however, when the load approaches that which is sufficient to induce liquid refrigera... | 08/17/2010 |
| 7685834 | HVAC desiccant wheel system and method An HVAC system includes a desiccant wheel, wherein the wheel's speed varies with airflow, the wheel is energized for at least a set period at startup, and/or a heat recovery system (e.g., an air-to-air heat exchanger) upstream of the wheel enhances the system's abil... | 03/30/2010 |
| 7656115 | Calibrating stepper motor by driving fractional ranges A stepper motor driving a driven member is calibrated by periodically driving the member from its current operational position to an end stop of the driven member's total travel range; however, the driven member approaches the end stop in a series of ever-shorter tr... | 02/02/2010 |
| 7578734 | Unit ventilator having a splitter plate and a pivoting damper blade assembly An HVAC unit ventilator, particularly suited for schools and hotels, includes a single damper blade driven directly by a motor to control a supply air's mixture of return air and outside air. The damper blade is selectively pivotal to a full outside air position, a ... | 08/25/2009 |
| 7556482 | Scroll compressor with enhanced lubrication Lubrication of bearing surfaces in a scroll compressor is enhanced by a vent arrangement which makes use of increased centrifugal force, achieved by locating the outlet of the vent arrangement radially outside of the nominal circumference of the compressor's drive s... | 07/07/2009 |
| 7526903 | Thermal break and panel joint for an air handling enclosure An HVAC air handling enclosure is comprised of individual panel assemblies each of which are fabricated from two panels or skins that are held together by double-sided adhesive tape. Adjacent panel assemblies are connected by a metal tongue-and-groove joint that rel... | 05/05/2009 |
| 7514932 | Method of recognizing signal mis-wiring of a three-phase circuit A signal analyzer for calculating the power consumption and power factor of a three-phase power system driving a motor includes logic that determines whether the analyzer's own input terminals are wired in a proper or inverted manner. To do this, the signal analyzer... | 04/07/2009 |
| 7513741 | Fan inlet flow distributor A fan inlet flow distributor comprises a skewed elliptical cone or equivalent body installed between an inlet opening of a centrifugal blower and an adjacent wall that faces the inlet. When all of the incoming airflow approaches the blower from the same general dire... | 04/07/2009 |
| D589605 | Air inlet grille | 03/31/2009 |
| 7455238 | Control system and method for multistage air conditioning system A controller and method for operating an HVAC system including an air conditioning unit, such as a gas furnace, having three stages of heat output and responsive to signals from a single stage or two stage thermostat. The W1, W2, and W3 inputs t... | 11/25/2008 |
| 7421896 | Variable frequency charge pump in capacitive level sensor A method of determining a fluid or material level. The method comprises the steps of: providing, at a first frequency, a current operatively capable of changing a capacitor; charging at least first and second capacitive devices to a predetermined voltage using the p... | 09/09/2008 |
| 7421855 | Gas trap distributor for an evaporator A shell-and-tube evaporator of a refrigerant system includes a refrigerant inlet distributor that traps a pocket of gaseous refrigerant to displace liquid refrigerant underneath the evaporator's tube bundle, thereby reducing the total charge of refrigerant in the ev... | 09/09/2008 |
| 7389646 | HVAC desiccant wheel system and method An HVAC system includes a desiccant wheel, wherein the wheel's speed varies with airflow, the wheel is energized for at least a set period at startup, and/or a heat recovery system (e.g., an air-to-air heat exchanger) upstream of the wheel enhances the system's abil... | 06/24/2008 |
| 7385593 | Generating and validating pixel coordinates of a touch screen display An enhanced touch-screen display system is disclosed for generating pixel coordinate estimates corresponding to a location on a display screen touched by a user. The system is an analog resistive touch-screen display system having a processor and associated software... | 06/10/2008 |
| 7383158 | HVAC service tool with internet capability A system for servicing a computer controlled machine comprising: a computer controlled machine including a device operable to perform a function, a controller controlling the operation of that device, and a data access port for transferring data and commands from th... | 06/03/2008 |
| 7381028 | Composite air handling blower housing and method of assembly An air handling blower housing for an HVAC system is formed by two opposed housing parts which are each fabricated of a compression molded reinforced thermoset polymer composition. The housing parts are joined along a parting line, preferably perpendicular to the ax... | 06/03/2008 |
| 7380588 | Heat pump control system and method of operating to provide automatic backup heating modes A heat pump type heating and air conditioning system includes a gas furnace or other auxiliary heat source and a thermostat and controller associated with the heat pump and the auxiliary heat source for automatically energizing the heat pump if the auxiliary heat so... | 06/03/2008 |
| 7351274 | Air filtration system control An intense field dielectric air filtration system associated with an air conditioning unit includes a microprocessor based control system which may be connected to the thermostat of the air conditioning unit to energize the air filtration system in response to a cal... | 04/01/2008 |
| 7340906 | HVAC desiccant wheel system and method An HVAC system includes a desiccant wheel, wherein the wheel's speed varies with airflow, the wheel is energized for at least a set period at startup, and/or a heat recovery system (e.g., an air-to-air heat exchanger) upstream of the wheel enhances the system's abil... | 03/11/2008 |
| 7332019 | Air filtration system An air filtration system includable in and for HVAC equipment includes one or more intense field dielectric filter units and a field charging unit retained in a support structure or cabinet by a removable door which includes control circuitry and contactors engageab... | 02/19/2008 |
| 7311501 | Scroll compressor with bifurcated flow pattern A scroll compressor includes various features that promote a bifurcated flow pattern of gas through a compressor shell to reduce oil entrainment. After entering the shell, some gas travels upward, which reduces the volume of gas traveling downward toward an oil sump... | 12/25/2007 |
| 7299996 | Thermostat with energy saving backlit switch actuators and visual display An air conditioning system thermostat includes a visual display and plural switch actuators, respectively backlit by an electroluminescent lamp and LED light sources mounted on a circuit board disposed in a thermostat housing. A control circuit causes at least one s... | 11/27/2007 |
| 7266956 | Base pan and cabinet for an air conditioner An air conditioner includes an outdoor section comprising an outdoor coil, a fan, and a refrigerant compressor housed within a cabinet. The cabinet includes an outer wrapper supported by a plastic base. The base and wrapper include features that facilitate the cabin... | 09/11/2007 |
| 7228693 | Controlling airflow in an air conditioning system for control of system discharge temperature and humidity An air conditioning system may comprise an air handler, heat pump or fossil fuel furnace and may include a variable speed blower for conducting air through the system and operably connected to a controller which is also connected to a thermostat and/or humidity sens... | 06/12/2007 |
| 7202858 | Processing analog to digital converter signals to a touch screen display An enhanced touch-screen display system is disclosed for generating pixel coordinate estimates corresponding to a location on a display screen touched by a user. The system is an analog resistive touch-screen display system having a processor and associated software... | 04/10/2007 |
| 7186080 | Fan inlet and housing for a centrifugal blower whose impeller has forward curved fan blades A centrifugal blower with forward curved fan blades includes an inlet shroud whose shape is specifically designed for creating a smooth incoming airflow pattern that leads into the inner leading edges of the fan blades. The inlet shroud has first and second curved s... | 03/06/2007 |
| 7178355 | HVAC desiccant wheel system and method An HVAC system includes a desiccant wheel, wherein the wheel's speed varies with airflow, the wheel is energized for at least a set period at startup, and/or a heat recovery system (e.g., an air-to-air heat exchanger) upstream of the wheel enhances the system's abil... | 02/20/2007 |
| 7168917 | Heat-generating blower housing A centrifugal blower for a furnace, heat pump, or other type of air handling unit includes a heat-generating blower housing that heats the airflow as the air passes through the blower housing. In some cases, the housing is made of a thermosetting resin impregnated w... | 01/30/2007 |
| 7158121 | Enhanced touch-screen display system An enhanced touch-screen display system is disclosed for generating pixel coordinate estimates corresponding to a location on a display screen touched by a user. The system is an analog resistive touch-screen display system having a processor and associated software... | 01/02/2007 |
