Lennox Industries Inc.

John Nhu Tran

Rakesh Goel

Eric M Perez

Steven Schneider

Bryan Smith

Siddarth Rajan

Mark W Olsen

Jeff Mangum

Donald N Zimmer

Thomas Edward Pate, Jr

Clay Toombs

An evaporator coil system includes a segmented evaporator coil. The segmented evaporator coil includes a primary segment and a secondary segment. A first plurality of evaporator circuit lines are fluidly coupled to the primary segment and a second plurality of evaporator circuit lines are fluidly coupled to the secondary segment. A suction line includes a first connection fluidly coupled to the primary segment and a second connection fluidly coupled to the secondary segment. A valve is arranged in fluid communication with the secondary segment so as to selectively restrict refrigerant flow through the secondary segment.

Method and apparatus for hybrid dehumidification

A heating system retrofitted to be operable through multiple heat stages at a constant fuel-air mixture includes a tube heat exchanger having a plurality of burners, a combustion air blower (CAB) having an exhaust vent connected with the plurality of burners, the CAB operable at a first speed and a second speed, a first valve connecting a fuel source to a first subset of the plurality of burners, and a second valve connecting a fuel source to a second subset of the plurality of burners.

Method of field conversion of a heating system to a multiple stage modulating gas fired heat exchanger

A temperature control method includes obtaining, by a controller, a space temperature value, a space temperature set point, a discharge air temperature value, and a discharge air temperature set point. The method further includes determining a compressor speed using a first PI loop based on the space temperature set point and the space temperature value, and determining a supply fan speed using a second PI loop based on the discharge air temperature set point and the discharge air temperature value. The temperature control method further includes outputting a first control signal that controls the speed of a variable speed compressor based on the determination of whether the compressor speed is within the compressor operation range and a second control signal to control the speed of a variable speed supply fan based on the determination of whether the supply fan speed is within the supply fan operation range.

Space temperature and discharge air temperature control

A modulating heating system includes a tube heat exchanger having a plurality of burners, a combustion air blower (CAB) having an exhaust vent connected with the plurality of burners, the CAB operable at a first speed and a second speed, a first valve connecting a fuel source to a first subset of the plurality of burners, and a second valve connecting a fuel source to a second subset of the plurality of burners, wherein the first and second valves each have a low fire rate and a high fire rate. The heat exchanger is operable through multiple heat stages at a constant fuel-air mixture.

Multiple stage modulating gas fired heat exchanger

A method of controlling a heating, ventilation and air-conditioning (HVAC) system includes measuring an ambient temperature and determining whether the ambient temperature is below a threshold temperature value. Responsive to a determination that the ambient temperature is below the threshold temperature value, measuring a condenser-fan cycle time of the HVAC system and setting a speed of the compressor based on the measured condenser-fan cycle time.

Method of and system for minimization of condenser-fan cycling for low ambient temperature

An air conditioning system includes an exterior housing, and a motor having fan blades rotatably coupled thereto located within the exterior housing. The air conditioning system further includes a controller coupled to the motor and configured to, based upon climate conditions proximate the exterior housing, alternate between an ON cycle during which the fan blades are rotated and an OFF cycle during which the fan blades are not rotated.

Fan motor controller for use in an air conditioning system

A covering apparatus for an enclosure presenting a ventilating barrier curved with respect to a barrier axis includes a segmented panel member having a plurality of louvered areas. Respective adjacent louvered areas of the plurality of louvered areas are separated by a respective bend structure. Each respective bend structure has a first section departing in a first direction from a first bend axis and a second section departing in a second direction from a second bend axis. The first and second bend axes are generally parallel with the barrier axis. The first direction is generally away from the second bend axis. The second direction is generally away from the first bend axis. The bend structure further has a third section extending from the first and second bend axes to a third bend axis. The third bend axis is non-coplanar with the first and second bend axes.

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The Colony, TX, United States of America

John Nhu Tran