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New Honeywell FocusPro 6000 possibly defective?

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Was very eager to purchase and use this thermostat for a drafty old Victorian with single pipe steam. Out of the box I set it up for 1 cph. I am getting very long run times now such as 45 minutes to an hour and only shut downs of 30-45 minutes. I was better off with the old stat and 20 minutes on and 20-30 minutes off and house was more comfortable as well.

The big mystery is I will happen to catch one of those long cycles and decide to go investigate. The set temp and the room temp will match but the system will continue to run an extra 15 minutes or more. Why? This is with HOLD displayed as well to rule out anything to do with programming. First it was doing it on 70 so I lowered it to 67. Same thing.

Thanks to help in my other thread I am getting much better steam response to the rads now. Just wanted to take advantage of the CPH feature but maybe I am not understanding it correctly.

Comments

  • Jamie Hall
    Jamie Hall Member Posts: 23,313
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    I doubt that the thermostat is defective -- but it is quite possible that you will be more comfortable if you set the cycles per hour to 2. Any of those settings is a recommendation -- not mandatory. So try resetting it to 2 and see if that's more comfortable.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    NYSteamGuy
  • ethicalpaul
    ethicalpaul Member Posts: 5,703
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    I agree with Jamie and I'll add that the thermostat might be only displaying 71 but it might be seeing 70.6 and keeping things burning for that 15 minutes or so until it sees actual 71.0
    NJ Steam Homeowner. See my sight glass boiler videos: https://bit.ly/3sZW1el
    NYSteamGuy
  • ratio
    ratio Member Posts: 3,627
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    Modern digital thermostats sense temperature with a significantly higher resolution then the display; & frequently control to a good portion of that (see e.g. https://forum.heatinghelp.com/discussion/183218/my-furnace-recycling-more-often-after-installing-a-new-thermostat-is-this-bad).

    Also, it's my belief that most digital stats lie; that is, as long as their control algorithm believes it's maintaining the setpoint within the deadband, it shows the temperature as holding steady regardless of the actual space temperature.

    NYSteamGuyethicalpaul