公开(公告)号：US10174967B2

公开(公告)日：2019-01-08

申请号：US14976354

申请日：2015-12-21

Applicant: Lennox Industries Inc.

Inventor： Steven Schneider ,  Eric Perez ,  Bryan Smith ,  John Tran

IPC: F24H9/20 ,  F24H3/08 ,  F24H3/00 ,  F24H3/02

Abstract: 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.

公开(公告)号：US10712047B2

公开(公告)日：2020-07-14

申请号：US14976485

申请日：2015-12-21

Applicant: Lennox Industries Inc.

Inventor： Eric Perez ,  Steven Schneider ,  Bryan Smith ,  John Tran

IPC: F24H9/20

Abstract: 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.

公开(公告)号：US10222109B2

公开(公告)日：2019-03-05

申请号：US15004376

申请日：2016-01-22

Applicant: Lennox Industries Inc.

Inventor： John Tran ,  Thomas Pate, Jr.

IPC: F25B49/02 ,  F24F11/30 ,  F24F11/77 ,  F24F11/83 ,  F24F110/10 ,  F24F120/20 ,  F24F11/63 ,  F24F11/64 ,  F24F11/85

Abstract: 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.

公开(公告)号：US20170211833A1

公开(公告)日：2017-07-27

申请号：US15004376

申请日：2016-01-22

Applicant: Lennox Industries Inc.

Inventor： John Tran ,  Thomas Pate, JR.

IPC: F24F11/00

CPC classification number: F25B49/022 ,  F24F11/30 ,  F24F11/63 ,  F24F11/64 ,  F24F11/77 ,  F24F11/83 ,  F24F11/85 ,  F24F2110/10 ,  F24F2120/20 ,  F25B2700/171 ,  F25B2700/173 ,  F25B2700/2104

Abstract: 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.