Refrigeration – Automatic control – Refrigeration producer
Patent
1984-09-21
1985-11-12
Wayner, William E.
Refrigeration
Automatic control
Refrigeration producer
184 64, 361104, F25B 3100
Patent
active
045519846
ABSTRACT:
Means for continuously shutting-down operation of an enclosed motor-compressor unit upon predetermined contamination of the refrigerant-oil mixture therein by conductive particles which comprises providing a normally open switch in the motor energizing circuit operated to a closed position by a sensitive D.C. relay when energized, in immersing a pair of spaced electrodes in the refrigerant-oil mixture, connecting the electrodes across an A.C. power source, connecting the D.C. relay in parallel with the electrodes across the A.C. power source through rectifying and voltage dropping means and in providing a fusible link in the A.C. power source connections so as to be responsive to a predetermined sum of current flow across the electrodes plus through the relay to break the connections, and in the provision of a normally open fusible switch responsive to fuse and close in response to a predetermined high motor temperature and through relay means open a second normally closed switch to break also the motor energizing circuit.
REFERENCES:
patent: 2552088 (1951-05-01), Davis
patent: 3959980 (1976-06-01), Hamilton
patent: 3959984 (1976-06-01), Vlasak
Bowsky Benjamin
Vogel Richard E.
Emerson Electric Co.
Markham Charles E.
Wayner William E.
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