Refrigeration – Automatic control – Withdrawing or adding refrigerant from or to normally closed...
Patent
1991-08-19
1992-03-31
Makay, Albert J.
Refrigeration
Automatic control
Withdrawing or adding refrigerant from or to normally closed...
55 21, 55 20, 55 23, 55247, 62 85, 62292, 62195, 62475, F25B 4500
Patent
active
050996533
ABSTRACT:
A refrigerant purification and recovery apparatus for removing refrigerant from a refrigeration unit includes a compressor, condenser and receiver vessel. Second and third conduits conduct refrigerant flow from the compressor to the condenser and from the condenser to the receiver vessel, respectively. An auxiliary condenser valve may be opened and closed to selectively block flow through the third conduit, and first and second connectors for making fluid communicating connections with the third conduit are located upstream and downstream of the valve, respectively. An auxiliary condenser may be releasably connected to the first and second connectors, and the valve closed, to cause fluid flowing through the third conduit to flow through the auxiliary condenser. The apparatus may include a temperature measurement and signaling device to signal when the temperature of the third conduit is above a predetermined temperature. In an alternative embodiment, the receiver vessel is a receiver-separator vessel, and a control device allows venting of the separator vessel only when the temperature of the third conduit is less than a predetermined temperature.
REFERENCES:
patent: 4805416 (1989-02-01), Many et al.
patent: 4862699 (1989-09-01), Lounis
Major Thomas O.
Major, Jr. Jack E.
Makay Albert J.
Oxenham J. Preston
Sollecito John
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