The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 08, 1980
Filed:
Nov. 27, 1978
Dale A Mueller, St. Paul, MN (US);
Stephen L Serber, New Hope, MN (US);
Honeywell Inc., Minneapolis, MN (US);
Abstract
An improper or wrong operational mode fault detection and control system for a reverse cycle refrigeration system for detecting faulty operation, i.e., operation in the cooling mode when heating is desired or in the heating mode when cooling is requested, and for controlling the system in response to the detection of a fault by inhibiting the compressor and for providing a fault indication, the control system comprising a controller means receiving inputs indicative of the outdoor air temperature, the temperature of the outdoor heat exchanger coil refrigerant, and an output indicative of a demand from a building temperature sensing means for heating or cooling of the building. The controller means also includes timing means and means for comparing the value of the outdoor heat exchanger coil refrigerant temperature and the value of the outdoor air temperature. Further, the controller means has an operative connection to control means for controlling the operation of the compressor and functioning to inhibit any further operation of the compressor means unless the value of the difference between the temperature of the outdoor heat exchanger refrigerant and the temperature of the outdoor air is less than a first preselected value when the thermostat requests heating, and unless said difference exceeds a second preselected value when the thermostat requests cooling.