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Furnace controller useable, without modification, with either a single or two stage thermostat

  • US 5,806,760 A
  • Filed: 04/17/1997
  • Issued: 09/15/1998
  • Est. Priority Date: 04/17/1997
  • Status: Expired due to Fees
First Claim
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1. A controller (1) connectable to a heat transfer device having a first heat transfer rate and a second, higher heat transfer rate, and (2) interchangeably connectable to either a single stage thermostat or a two stage thermostat, said controller being operative to receive at least one heat transfer rate demand signal from the thermostat to which it is connected and responsively regulate the operation of the heat transfer device, said controller comprising:

  • a first thermostat input portion for receiving a thermostat-generated low heat transfer rate demand signal;

    a second thermostat input portion for receiving a thermostat-generated high heat transfer rate demand signal; and

    control means for monitoring said first and second thermostat input portions and (1) generating a first control output useable to regulate the operation of the heat transfer device in a two stage thermostat mode in response to the detection by said control means of the receipt of said low heat transfer rate demand signal without the receipt of said high heat transfer rate demand signal, and (2) generating a second control output useable to regulate the operation of the heat transfer device in a single stage thermostat mode in response to the detection by said control means of the receipt of said high heat transfer rate demand signal without the receipt of said low heat transfer rate demand signal.

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