F - Mech Eng,Light,Heat,Weapons – 25 – B
Patent
F - Mech Eng,Light,Heat,Weapons
25
B
341/28
F25B 7/00 (2006.01) F25B 49/00 (2006.01) F25B 49/02 (2006.01) F25D 17/02 (2006.01) G05D 23/19 (2006.01)
Patent
CA 1211815
Title CONTROL FOR A VARIABLE CAPACITY TEMPERATURE CONDITIONING SYSTEM Inventor David M. Foye Abstract A control for a variable capacity reciprocating compressor water chiller system. A microprocessor connected to monitor return and supply fluid temperature sensors in the system is programmed to vary the compressor capacity in response to the deviation of the re- turn and supply chilled water temperatures from desired values. The control determines these desired values as a function of predetermined full load return, supply, and reference temperature setpoints, and as a function of the relative loading of the chiller system. The control also functions to selectively offset the chilled water temperatures in one of three control modes. If zone temperature sensors are con- nected to the control, the offset is a function of the deviation of the weighted average zone temperature from a setpoint. The second control mode allows offset as a function of the outdoor ambient air temperature, and the third, as a function of a temporary setpoint.
455545
American Standard International Inc.
Fetherstonhaugh & Co.
Trane Canada Inc.
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