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Grundfos Alpha

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James Day_2
James Day_2 Member Posts: 191
in THE MAIN WALL
I decided to install a grundfos alpha on my heating system, figured i'd like to try it out on my own system before i start installing it own others systems.  I have a hydro coil forced air system.  In autoadapt, i only get 1gpm feeding my hydro coil. It heats the house right now but in the cold part of winter i doubt it would keep up.  If I put  it to speed 2, i get about 3-4 gpm.  Why in autoadapt is the gpm so low.  Can someone explain how the autoadapt works, in simple terms :) 



Thanks,  James

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  • Robert O'Brien
    Robert O'Brien Member Posts: 3,541
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    Page 7

    explains settings. Do you have it powered constantly? http://www.metropac.com/images/ALPHA%20INSTALLATION.pdf
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  • James Day_2
    James Day_2 Member Posts: 191
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    alpha

    It is powered all the time.  I think I might just wire it through my zone control panel and have it run on constant pressure or speed 2. 
  • CMadatMe
    CMadatMe Member Posts: 3,086
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    Delta-T

    What's the delta-t across supply and return? There have been many past posts up here trying to figure out the "state secret."  Hopefully the attached can help you out in understanding it better.

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  • bob_46
    bob_46 Member Posts: 813
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    Alpha

    James, how many zones do you have and how do you control them ? Are they all hydro-air?

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  • James Day_2
    James Day_2 Member Posts: 191
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    alpha

    2 zones

    one zone hydro for whole house

    second zone radiant in master bathroom
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