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Thermostat set at one cycle per hour

When the thermostat calls for heat after making the one cycle setting, does this mean that the boiler will run until the thermostat setting is reached and then the thermostat will not call for heat again  until one hour from the time the boiler initially turned on?


  • Tim McElwain
    Tim McElwain Member Posts: 4,608
    edited June 2010
    No it means

    it will come on at a call for heat and run until the thermostat is satisfied, it allows for a long cycle to insure steam gets into all the radiators and it then shuts off. As noted it is typically set for one cycle on steam systems. When using the anticipator in the thermostat we set it to the 1.2 area for the longest cycle. On some programmable thermostats we have dip switches which allow settings of 9 for electric strip heat, 6 for conventional forced hot water and forced warm air, 3 for high efficiency equipment and 1 for steam systems.

    We have however in recent years seen a step in the right direction for steam to be a staged system. This is accomplished by using a pressuretrol or vaporstat with a two stage gas valve.

    Steamhead and Gerry Gill have done some of these and post here on heatinghelp.com, they could fill you in on particulars or you can order Dan's new book "Greening Steam."
  • Dick_2
    Dick_2 Member Posts: 14
    Thank you for the reply!

    It was very informative.
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