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Supplemental heat control system with duct temperature sensor and variable setpoint

  • US 5,367,601 A
  • Filed: 02/16/1994
  • Issued: 11/22/1994
  • Est. Priority Date: 02/16/1994
  • Status: Expired due to Fees
First Claim
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1. In a heater system having a primary heating means operable to heat and circulate a medium via a duct, and a supplemental heating means for further heating the medium when necessary to supplement the primary heating means for maintaining a desired temperature in a heated space, the primary and supplemental heating means being activatable in part by a thermostat responsive to the heated space, having at least two outputs respectively indicating a heated space temperature falling below one of two space temperature setpoints, of which one is the desired temperature of the heated space, a controller comprising:

  • a temperature sensor coupleable to determine a temperature of the medium at the duct;

    a control circuit having inputs coupled to the temperature sensor and to said outputs of the thermostat, the control circuit being coupled to determine the duct temperature from the temperature sensor;

    memory means coupled to the control circuit, the control circuit being operable to store in the memory means a variable duct temperature setpoint, to compare the duct temperature to the duct temperature setpoint, and to activate an output to enable the supplemental heating means when the duct temperature falls below the duct temperature setpoint;

    wherein the control circuit includes means for incrementally adjusting the duct temperature setpoint stored in the memory means, upwardly upon occurrence of the temperature in the heated space dropping below a lower one of the space temperature setpoints, and downwardly upon the temperature in the heated space exceeding a higher one of the two space temperature setpoints.

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