System and method for distinguishing HVAC system faults

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United States of America Patent

PATENT NO 11193685
SERIAL NO

16806274

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Importance

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Abstract

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A controller of an HVAC system is communicatively coupled to a liquid-side sensor and a shutoff switch. The controller stores measurements of a liquid-side property over an initial period of time. The controller detects that the shutoff switch is tripped at a first time stamp corresponding to an end of the initial period of time. The controller accesses the measurements of the liquid-side property. The controller determines, based on the measurements of the liquid-side property, whether the liquid-side property has an increasing or a decreasing trend. In response to determining that the liquid-side property has the decreasing trend, a malfunction of a blower of the system is determined to have caused the shutoff switch to trip. In response to determining that the liquid-side property has the increasing trend, a blockage of the refrigerant conduit subsystem is determined to have caused the shutoff switch to trip.

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Patent Owner(s)

  • LENNOX INDUSTRIES INC.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Brahme, Amita Dallas, US 14 16
Gokhale, Umesh Irving, US 39 79

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