Capacity control for multi-stage compressors

Details Capacity control for multi-stage compressors Capacity control for multi-stage compressors

1994-12-21

1997-05-06

Wayne, William E.

Refrigeration

Automatic control

Diverse, cascade or compound refrigeration-producing system

236 1EA, F25B 700, G05D 2300

Patent

active

056260270

ABSTRACT:
In a positive displacement compressor having a plurality of banks, operation can be multi-staged or single staged. Single stage operation can be of a single bank or plural banks in parallel. Switchover between modes of operation is under the control of a microprocessor responsive to sensed inputs. During pulldown under ambient or condenser entering air temperatures of 100.degree. F., or more, suction modulation is used to limit the suction pressure thereby permitting a switchover to two-stage operation and the use of an economizer.

REFERENCES:
patent: 2319130 (1943-05-01), Hanson
patent: 3098449 (1963-07-01), Hill
patent: 4152902 (1979-05-01), Lush
patent: 4494383 (1985-01-01), Nagatomo et al.
patent: 4938029 (1990-07-01), Shaw
patent: 5016447 (1991-05-01), Lane et al.
patent: 5062274 (1991-11-01), Shaw
patent: 5094085 (1992-03-01), Irino
patent: 5425244 (1995-06-01), Vaynberg

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