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circulator placement

zeke Member Posts: 223
I don't see a big problem with this. It looks like some form of a priority HW system so that during the few periods of heavy HW usage you get more HW at the expense of heating capacity. Since this occurs at very few times during the day, I would think that the overall heating system should be fine.

The suggested configuration might be a problem for a marginal boiler if you have setback thermostats and the heating load in the morning of a very cold day is almost the boiler capacity.Then you may have insufficient hot water.

Before I would make a change, I would see how it works and then if there are any issues, have the plumber make the change.


  • Georg
    Georg Member Posts: 8

    I just had a new heating system installed (Triangle Tube, prestige 175) with a smart 50 domestic water heat exchanger. The drawing in the manual does not agree with what has been installed.

    A drawing of what has been installed and of what is in the manual are attached.

    Is any of these arrangements better than the other? Should I be concerned that the installer did not follow the manual?
  • Brad White
    Brad White Member Posts: 2,398
    What you mean is....

    The installation does not conform to the manual, not the other way around, Georg. :)

    What the manual wants is each circuit to see the same temperature.

    What was installed causes the radiation temperature to be lower when the domestic HW is calling.

    Because the DHW gets first pick and dumps it's return back upstream of the radiation, the radiation gets whatever it can without true control.

    It MAY be possible that the radiation works with ultra-low temperatures, but it would seem that you could not count on a controllable temperature at any given time.

    I would have the installer go back and pipe it per specifications.
    "If you do not know the answer, say, "I do not know the answer", and you will be correct!"

    -Ernie White, my Dad
  • Ken_40
    Ken_40 Member Posts: 1,320
    Both drawings could work...

    But the location of two undrawn items is required; those being: the check valves that must be included (either free-standing, or internal circ.checks - and, the point where the expansion tank ties in.

    If you can include those two items, we can comment as to the appropriateness of the array.

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  • Georg
    Georg Member Posts: 8
    location of check valves and expansion tank

    The check valves are internal (at least that is what the installer said, it is from Grundfos ).

    I have added the location of the expansion tank in the top drawing.

    Your comments are very much appreciated.
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