F - Mech Eng,Light,Heat,Weapons – 25 – B
Patent
F - Mech Eng,Light,Heat,Weapons
25
B
340/77
F25B 49/00 (2006.01)
Patent
CA 1267461
ABSTRACT OF THE DISCLOSURE When sensors are employed to monitor the evaporator refrigerant pressure and the leaving chilled liquid temperature in an air conditioning system of the type having a liquid chiller, the sensor outputs will normally have a prescribed relationship with respect to each other as long as the sensors are functioning properly and regardless of the operating condition of the air conditioning system. By effectively comparing the output of one sensor relative to that of the other sensor, a faulty condition of either sensor may be detected. This is achieved by calculating the equivalent evaporator temperature, from the evaporator refrigerant pressure, and subtracting the equivalent temperature from the leaving chilled liquid temperature to obtain a difference temperature which is then compared to a predetermined known temperature range representing normal functioning of the two sensors. When one of the sensors is defective the difference temperature will fall outside of the range. If that occurs, a warning message that a faulty sensor has been detected is displayed to operating personnel and the air conditioning system's compressor is shut down as a safety precaution.
518539
Ginder Harold B.
Hansen John C.
Johnson Lloyd A.
Macrae & Co.
York International Corporation
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