Lennox Industries Inc.

Absalon Bonilla

Richard A Mauk

Carlos O Chamorro

John P Stachler

An HVAC controller and a method of controlling an HVAC system. In one embodiment, the controller includes: (1) a processor couplable to at least one indoor air quality sensor to receive values therefrom representing at least three levels of indoor air quality and (2) memory coupled to the processor and configured to store a software program capable of causing the processor to control an HVAC system based on magnitudes of the values.

Heating, ventilation and air conditioning system controller having a multifunctional indoor air quality sensor and method of controlling the system based on input from the sensor

An HVAC unit includes a transformer and a system controller. The transformer is configured to receive power from a first and a second phase of a three-phase power source and to produce a first reduced-voltage waveform therefrom. The system controller is adapted to sample the reduced voltage waveform to determine a figure of merit of the three-phase power source. The controller is further configured to operate the HVAC unit in response to the figure of merit.

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Carrollton, TX, United States of America

Absalon Bonilla