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Fan coil thermostat with fan ramping

  • US 9,909,773 B2
  • Filed: 04/19/2017
  • Issued: 03/06/2018
  • Est. Priority Date: 08/03/2007
  • Status: Active Grant
First Claim
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1. A method of operating a fan coil system comprising a fan coil and a fan adapted to blow air across the fan coil, the fan having a plurality of fan speeds, the method comprising:

  • displaying a temperature set point on a user interface, the temperature set point being adjustable via the user interface;

    obtaining a current temperature value from a temperature sensor;

    determining a temperature difference between the current temperature value and the temperature set point;

    storing a maximum temperature difference, a first threshold for the temperature difference that is less than the maximum temperature difference and a second threshold that is greater than the first threshold and less than the maximum temperature difference;

    establishing a fan throttle range based on the maximum temperature difference;

    operating the fan at a low fan speed within the fan throttle range when the temperature difference is below the first threshold;

    operating the fan at a medium fan speed within the fan throttle range when the temperature difference is between the first threshold and the second threshold; and

    operating the fan at a high fan speed within the fan throttle range when the temperature difference is above the second threshold.

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