System and method of disabling an HVAC compressor based on a low pressure cut out

US8151585B2 · kind B2 · utility

Assignee

• TRANE INTERNATIONAL INC. · US

Inventors

• Jonathan D. Douglas · Lewisville, US
• John Raymond Edens · Kilgore, US
• Alan D. Marble · Whitehouse, US
• Kevin B. Mercer · Troup, US
• Gary L. Sapp · Plano, US
• Brett R. Schneider · Tyler, US
• Steven A. Tice · Flint, US

Key dates

• Filing date: Sep 26, 2008
• Grant date: Apr 10, 2012
• Expiry date: Feb 9, 2031

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04B49/08
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

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 heating, ventilating, and air conditioning (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.