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Gordy

I ran out of paper. When setting the curve it's best to do it on average temps for the winter. You don't need to wait for "design temp" to happen. When it does happen as I said if your losing setpoint raise the curve in small increments. If you are maintaining setpoint you could drop the curve a bit, and see what happens. The basis that the boiler should run constant in a design day temp is limited to the boiler being exactly matched to the load, and the emitters. So don't really look to achieve that, but if it happens great.

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  • I ran out of paper.

    When setting the curve it's best to do it on average temps for the winter. You don't need to wait for "design temp" to happen. When it does happen as I said if your losing setpoint raise the curve in small increments. If you are maintaining setpoint you could drop the curve a bit, and see what happens.

    The basis that the boiler should run constant in a design day temp is limited to the boiler being exactly matched to the load, and the emitters. So don't really look to achieve that, but if it happens great.
    April 28
  • As pointed out the vitodens 100 reset control is a bit limited compared to its 200 counter part.

    A basic thermostat is really all that is required. Again ideally when dialing in the ODR you would turn the thermostat up past your desired setpoint by at least 5 degrees so the thermostat does not conflict with adjusting the ODR.

    Then you need to be patient making adjustments to the ODR curve in small increments, and then letting the structure aclimate with the settings for a day , or two. Otherwise you end up chasing the dogs tail. You will know once you are dialed in when the system maintains your desired setpoint then you are good to go. Then you can drop your thermostat setting back down to your desired set point. Now the thermostat keeps the ODR in check for internal, and external gains we talked about that it can not compensate for. Remember ODR works based on outdoor air temperature only.

    If you hit design day, and setpoint is losing ground just raise the curve a bit.
    April 28
  • satwar
    Hi Gordy

    Thanks for all your help. It looks like the nest thermostat I have is causing me confusion. If you could, I'd appreciate if you could point me out a few thermostat models that provide a high room temperature trip and what should the upper limit be ? I assume that I need to disable the temperature control algorithms, while the high temperature is still armed to activate if limits are exceeded.

    I'm still not sure I understand this dialing in the house with the Vitodens 100 heating curve dial. Presumably, I select my design day outdoor temperature. I then wait for the outdoor temperature to meet my design day outdoor temperature and then start dialing down the heating curve on the boiler until the burner is running virtually continuously. If the outdoor temperature gets colder the boiler reacts by increasing the firing rate. If the outdoor temperature gets warmer the boiler reacts by decreasing the firing rate.

    Again, thanks for your patience
    April 27
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