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Grundfos Alpha Behavior

Brent H.
Brent H. Member Posts: 161

A couple months back I installed a Grundfos Alpha for use with 3 zones in a new addition. The Alpha is pumping away from the boiler and the zone valves are located remotely within the addition on the returns. I've noticed that the Alpha always shows 0 GPM but the heat is working OK. I'm wondering if I need to run the pump in a manual mode instead of AutoAdapt. Any thoughts?




  • pumpguy_2
    pumpguy_2 Member Posts: 1
    ALPHA Info

    The first thing I would ask is are you experiencing any discomfort in the room due to low heat???

    If you are getting flow, it is probably less than 1 GPM which will not show on the digital readout. 

    The ALPHA shows us that we seriously over size our pumps.
  • Brent H.
    Brent H. Member Posts: 161

    I just hooked up the biggest loop Saturday and the room held at 68 with the outside temperature at under 10 degrees. I'm going to take a few measurements of the supply and return tonight and see what the delta-t is.
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