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:
Oct. 05, 1993
Filed:
Jul. 06, 1992
Anthony W Abraham, Arlington, TX (US);
Wynn's Climate Systems, Inc., Fort Worth, TX (US);
Abstract
A refrigeration system servicing apparatus includes a digital controller, a vessel for storing and pressurizing refrigerant, a solenoid actuated valve responsive to the digital controller for selective connection of the refrigeration system to a vacuum source, a solenoid actuated valve responsive to the digital controller for connection of the vessel to the refrigeration system, a pressure sensor for providing pressure readings to the digital controller from the low pressure side of the vacuum source, a pressure sensor for providing pressure readings to the digital controller from the vessel and means for quantifying the refrigerant in the Vessel. Three operational modes provided for are: a 'vacuum' mode, during which residue material in the refrigeration system is boiled away; a 'charge oil' mode, during which lubricant is added to the refrigeration system; and a 'charge refrigerant' mode, during which refrigerant is added to a refrigeration system. During vacuum mode the refrigeration system may be subjected to a pressure integrity test. Where in an inadequate vacuum is developed the error condition is signalled and the service technician is given opportunity to attempt correction. If a sufficient vacuum is developed, but cannot be held within a certain range for a minimum period the error condition is signalled and the service technician is again given opportunity to correct the condition, or to abort the operation.