Bad ground and reverse polarity detection for HVAC controls
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United States of America Patent
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Jun 21, 2016
Grant Date -
Aug 6, 2015
app pub date -
Jan 31, 2014
filing date -
Jan 31, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
In exemplary embodiments, HVAC controls and corresponding error detection methods are disclosed. In an exemplary embodiment, an HVAC control generally includes a digital input configured to receive a digital signal, an analog input configured to receive an analog signal, and an error indicator. The control is configured to receive a neutral signal at the analog input, determine a voltage of the neutral signal with respect to earth ground, and operate the error indicator to indicate a normal state if the voltage is below a first threshold, a bad ground state if the voltage is between the first threshold and a second threshold, and a reverse polarity state if the voltage is above the second threshold.
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