David C Mackey

US Patent:

20180120001, May 3, 2018

Filed:

Oct 28, 2016

Appl. No.:

15/337810

Inventors:

- Richardson TX, US
Aylan Him - Coppell TX, US
Gregory Ruhlander - Little Elm TX, US
Claudia A. Morales - Rockwall TX, US
David Mackey - Addison TX, US

Assignee:

Lennox Industries Inc. - Richardson TX

International Classification:

F25B 39/00
F28D 1/04
F28D 1/053
F28F 9/02

Abstract:

A system and method for a multistage condenser is described that reduces problems associated with temperature and pressure differential strains on tubes above and below a dead tube. Instead of connecting the dead tube to the I/O manifold, a physical separation is created. The physical separation can be created by shortening the dead tube, coring a portion of the I/O manifold where the dead tube is received, independent I/O manifolds, or other means.

US Patent:

20170051960, Feb 23, 2017

Filed:

Nov 4, 2016

Appl. No.:

15/343258

Inventors:

- Richardson TX, US
David Mackey - Addison TX, US
Lin Hong - Plano TX, US

International Classification:

F25B 49/02
F25B 31/00

Abstract:

The present invention provides a control system for managing lubricant levels in tandem compressor assemblies of a heating, ventilation, and air conditioning (HVAC) system. In transitioning from a partial load that operates a first compressor but not a second compressor of a tandem assembly to a full load that operates both the first and the second compressor, a controller of the HVAC system turns OFF both compressors of the tandem compressor assembly to allow time for lubricant levels to equalize between the first and the second compressor.

US Patent:

20150345848, Dec 3, 2015

Filed:

Jun 2, 2014

Appl. No.:

14/293099

Inventors:

- Richardson TX, US
David Mackey - Addison TX, US
Lin Hong - Plano TX, US

Assignee:

Lennox Industries Inc. - Richardson TX

International Classification:

F25B 49/02
F25B 31/02
F25B 31/00

Abstract:

The present invention provides a control system for managing lubricant levels in tandem compressor assemblies of a heating, ventilation, and air conditioning (HVAC) system. In transitioning from a partial load that operates a first compressor but not a second compressor of a tandem assembly to a full load that operates both the first and the second compressor, a controller of the HVAC system turns OFF both compressors of the tandem compressor assembly to allow time for lubricant levels to equalize between the first and the second compressor.