Kristin L Schaefer

US Patent:

8113789, Feb 14, 2012

Filed:

Sep 26, 2008

Appl. No.:

12/238966

Inventors:

Jonathan D. Douglas - Bullard TX, US
John R. Edens - Kilgore TX, US
Carl L. Garrett - Tyler TX, US
Alan D. Marble - Whitehouse TX, US
Kevin B. Mercer - Troup TX, US
Gary L. Sapp - Tyler TX, US
Kristin L. Schaefer - Tyler TX, US
Brett R. Schneider - Tyler TX, US
Steven A. Tice - Flint TX, US

Assignee:

Trane International Inc. - Piscataway NJ

International Classification:

F04B 49/00
F25B 49/00

US Classification:

417 38, 417 442, 622283, 622281

Abstract:

A system and method is provided for monitoring a system pressure to infer whether a high pressure cut out (HPCO) switch has opened disabling a heating, ventilating, and air conditioning (HVAC) compressor. A system and method are also provided for determining whether to disable the HVAC compressor based on a status of a low pressure cut out (LPCO) switch, an ambient temperature, and system mode state. The systems and methods may be used interchangeably with the appropriate adjustments to decision limits, such as where the LPCO may be monitored to infer status and the HPCO status may be directly used with temperature and system mode state.

US Patent:

20090044703, Feb 19, 2009

Filed:

Aug 15, 2007

Appl. No.:

11/893159

Inventors:

Larry S. Bias - Flint TX, US
Kristin Lyn Schaefer - Tyler TX, US
Shannon L. Smith - Flint TX, US
John Mark Hagan - Tyler TX, US
Mark David Woodruff - Tyler TX, US
Daniel Joseph Mitchell - Gilmer TX, US
Cassius J. Mullen - Whitehouse TX, US
Timothy H. Cauley - Whitehouse TX, US
Robert Beasley - Whitehouse TX, US

International Classification:

B03C 3/011
B01D 50/00
B03C 3/00

US Classification:

96 66, 55481, 95 2

Abstract:

An intense field dielectric air filtration system includes a perimeter frame for wall or ceiling mounting at the inlet of a return air duct for an air conditioning apparatus. A door including a grille disposed thereon is mounted for movement on the frame between working and non-working positions for access to an air filter unit, a pre-filter unit and an intense field particle charging unit. Contacts on the filter unit and the field charging unit engage cooperating contacts on an enclosure mounted on the frame when the door is closed to supply electrical power. An interlock is provided to interrupt power when the door is moved to an open position or the grille is removed. A control system disposed in the enclosure includes user control features accessible when the door is in an open position. An alternate embodiment includes a support frame for positioning the filtration system in ductwork or the like other than a return air inlet.

US Patent:

20100123016, May 20, 2010

Filed:

Nov 17, 2008

Appl. No.:

12/272518

Inventors:

Jonathan D. DOUGLAS - Bullard TX, US
John R. EDENS - Kilgore TX, US
Alan D. MARBLE - Whitehouse TX, US
Kevin B. MERCER - Troup TX, US
Gary L. SAPP - Tyler TX, US
Kristin L. SCHAEFER - Tyler TX, US
Steven A. TICE - Flint TX, US

Assignee:

TRANE INTERNATIONAL, INC. - Piscataway NJ

International Classification:

F24F 7/00

US Classification:

236 493

Abstract:

A system and a method are provided for returning oil in a heating, ventilation, and air conditioning (HVAC) system by determining when an ambient zone temperature is equal to or less than a temperature limit and reversing a direction of refrigerant flow of the HVAC system based on the length of time. Also, a system and a method are provided for monitoring the length of operation in a first and a second heating mode and for reversing a direction of refrigerant flow based on the length of time operation occurs in the first and second heating modes. A system and a method having a first compressor, a first heating mode, a second heating mode, a defrost mode, and a controller is disclosed. The controller selectively controls initiation of the defrost mode in response to an HVAC system operating in a heating mode of operation for a predetermined amount of time.

US Patent:

20100125368, May 20, 2010

Filed:

Nov 17, 2008

Appl. No.:

12/272504

Inventors:

John J. BAILEY - Tyler TX, US
Jose L. BALDERRAMA - Tyler TX, US
Jonathan D. DOUGLAS - Bullard TX, US
John R. EDENS - Kilgore TX, US
Alan D. MARBLE - Whitehouse TX, US
Gary L. SAPP - Tyler TX, US
Kristin L. SCHAEFER - Tyler TX, US
Brett R. SCHNEIDER - Tyler TX, US
Steven A. TICE - Flint TX, US

Assignee:

Trane International, Inc. - Piscataway NJ

International Classification:

G05B 15/00
G05D 23/00

US Classification:

700276, 236 46 R

Abstract:

A system and a method are provided for powering up a heating, ventilation, and air conditioning (HVAC) system and operating a sump heater for a compressor for a first predetermined period of time in response to the HVAC system being powered up. A heating, ventilation, and air conditioning system and a method for controlling the system are provided. The HVAC system includes a compressor, a sump heater associated with the compressor, and a controller configured to control the compressor and the sump heater so that the sump heater is not operated while the compressor is operated.

US Patent:

20130067943, Mar 21, 2013

Filed:

Nov 14, 2012

Appl. No.:

13/676941

Inventors:

Trane International Inc. - Piscataway NJ, US
John R. Edens - Kilgore TX, US
Alan D. Marble - Whitehouse TX, US
Kevin B. Mercer - Troup TX, US
Gary L. Sapp - Tyler TX, US
Kristin L. Schaefer - Tyler TX, US
Steven A. Tice - Flint TX, US

Assignee:

TRANE INTERNATIONAL INC. - Piscataway NJ

International Classification:

F25B 47/02
F25B 13/00
F25B 49/02

US Classification:

62155, 623245

Abstract:

A system and a method are provided for returning oil in a heating, ventilation, and air conditioning (HVAC) system by determining when an ambient zone temperature is equal to or less than a temperature limit and reversing a direction of refrigerant flow of the HVAC system based on the length of time. Also, a system and a method are provided for monitoring the length of operation in a first and a second heating mode and for reversing a direction of refrigerant flow based on the length of time operation occurs in the first and second heating modes. A system and a method having a first compressor, a first heating mode, a second heating mode, a defrost mode, and a controller is disclosed. The controller selectively controls initiation of the defrost mode in response to an HVAC system operating in a heating mode of operation for a predetermined amount of time.