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Electronic boiler control

  • US 5,779,143 A
  • Filed: 02/13/1997
  • Issued: 07/14/1998
  • Est. Priority Date: 02/13/1997
  • Status: Expired due to Term
First Claim
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1. A hydronic heating system including a main boiler and a circulating pump, the hydronic heating system heating a plurality of heating zones, the system comprising:

  • a plurality of zone thermostats, each thermostat in communication with one of the heating zones, the zone thermostats each generating a demand signal upon sensing that the temperature in the heating zone is below a desired value;

    a plurality of zone valves, each zone valve being positioned between the main boiler and one of the heating zones, the operation of each zone valve controlling the flow of heated water from the main boiler to the heating zone;

    a hydronic control unit in communication with the plurality of zone thermostats and zone valves, the hydronic control unit operating the zone valves to control the flow of heated water from the main boiler into each heating zone, the hydronic control unit further being in communication with the main boiler to maintain the boiler water temperature at a desired boiler temperature;

    a priority device in communication with the hydronic control unit, the hydronic control unit diverting the flow of heated water from the boiler to only the priority device upon receiving a demand signal from the priority device, the hydronic control unit monitoring the priority device and restoring the flow of heated water to the zone valves after a predetermined delay during which heated water is diverted only to the priority device;

    an outdoor temperature sensor in communication with the hydronic control unit;

    a low water sensor in communication with the hydronic control unit the low water sensor disabling the hydronic control unit upon sensing a reduced amount of water in the hydronic heating system; and

    a mode selection switch, the mode selection switch selecting from a standard operating mode and a boiler reset operating mode, wherein when the standard operating mode is selected, the hydronic control unit maintains the boiler water temperature between an upper and a lower temperature limit, and wherein when the boiler reset operating mode is selected the hydronic control unit modifies the desired boiler temperature based on the outside air temperature.

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