Capacity control for multi-stage compressors
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United States of America Patent
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May 6, 1997
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N/A
app pub date -
Dec 21, 1994
filing date -
Dec 21, 1994
priority date (Note) -
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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.
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