Refrigeration – With means for charging closed refrigeration producing system
Patent
1992-07-06
1993-10-05
Makay, albert J.
Refrigeration
With means for charging closed refrigeration producing system
62149, F25B 4500
Patent
active
052494349
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.
REFERENCES:
patent: 3686954 (1972-08-01), Motl
patent: 4470265 (1984-09-01), Correia
patent: 4513578 (1985-04-01), Proctor et al.
patent: 4688388 (1987-08-01), Lower et al.
Doerrler William C.
Makay Albert J.
O'Malley, Jr. Paul W.
Wynn's Climate Systems, Inc.
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