Refrigeration – Automatic control – Time or program actuator
Patent
1976-03-12
1977-07-05
Wayner, William E.
Refrigeration
Automatic control
Time or program actuator
62196A, G05D 2332
Patent
active
040337383
ABSTRACT:
The heat pump system includes a first and a second centrifugal compressor arranged in series relation in a system including interstage expansion of the refrigerant. A pair of parallel circuits is provided for controlling the energization of the compressors in a sequence in which the first to start compressor must be energized to obtain completion of the second parallel circuit required for energization of the second to start compressor. The start of the second compressor is delayed for a period permitting the first compressor to come up to speed and the first circuit controlling the energization of the first compressor will be interrupted unless the second compressor has started within a short period of time after the time delay in starting the second compressor.
The arrangement also includes a thermostatic switch in the first circuit and a relay arrangement controlled in accordance with the thermostatic switch for opening a part of the second circuit in accordance with the opening of the first circuit with the thermostatic switch. With this arrangement, a third, manual-reset circuit which must remain in a completed condition for normal operation of the compressors in accordance with temperature demands, is prevented from being interrupted by operation of a time delay opened switch in the manual-reset circuit under the control of a safety timing means in a branch circuit of the second circuit.
REFERENCES:
patent: 2177602 (1939-10-01), Spann
patent: 2196687 (1940-04-01), Steinfeld
patent: 3599006 (1971-08-01), Harris
patent: 3668883 (1972-06-01), Ruff et al.
PF Centrifugal Chiller Electrical System, pp. 24-33.
Evans William F.
Merola Carl R.
Shaffer Raymond E.
Arenz E. C.
Charvat Robert J.
Wayner William E.
Westinghouse Electric Corporation
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