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Variable output heating and cooling control

  • US 6,866,202 B2
  • Filed: 09/06/2002
  • Issued: 03/15/2005
  • Est. Priority Date: 09/10/2001
  • Status: Expired due to Fees
First Claim
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1. A variable output heating system comprising:

  • a) a variable speed combustion blower;

    b) a variable fuel supply valve;

    c) a variable speed circulator;

    d) a pressure sensor to measure a pressure produced by the variable speed combustion blower;

    e) a controller having input from the pressure sensor and outputs for at least the variable elements of a) and c) above, the controller including;

    i. a thermostat algorithm for determining a desired firing rate, ii. a lookup table or equation accessible to determine a desired differential pressure of the variable speed combustion blower for the desired firing rate stoichiometry, iii. means for adjusting the variable speed combustion blower speed in order to achieve the desired differential pressure, and iv. means for adjusting the variable speed circulator so as to maintain a circulation according to one of a temperature criterion, a flow criterion and a pressure criterion.

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