Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Grundfos Alpha2 and Webstone isolation flange

Options
Le John
Le John Member Posts: 226
in THE MAIN WALL
I want to replace a Grundfos 1558 with an Alpha 2. When I line up the bolts it looks like the box for the conduit will not fit with the isolation valve in the open position. Has anyone experienced this? Before I tried it I figured I would ask. Doesn’t appear it’s going to fit.

A safe and Happy New Year to all.

Comments

  • Daveinscranton
    Daveinscranton Member Posts: 148
    Options
    Take take off the valve handle.  Use a 4” or 6” adjustable wrench.  Leave it off and use the wrench as a handle.  Or trim the valve handle with a hack saw.

    Best wishes.
  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 4,013
    edited December 2021
    Options
    Sometimes you have to modify the handle to make it fit. We remove the yellow rubber cover from the handle, cut the handle shorter with an abrasive saw and then put the rubber cover back on.

    Or just remove the handle and leave it hanging from a pipe for it to be used when needed.

    You should also be able to rotate the flange 90 degrees and have the pump facing to the right.
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,550
    Options
    I am not a Grundfos expert but can't you turn the motor 90 deg like other pumps?
    Derheatmeister
  • hot_rod
    hot_rod Member Posts: 22,158
    Options
    EBEBRATT-Ed said:
    I am not a Grundfos expert but can't you turn the motor 90 deg like other pumps?
    Yes but the digital display would be sideways
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Derheatmeister
    Derheatmeister Member Posts: 1,545
    Options
    Rotate head of circ and handles of webstone until it works..
    Have fun wiring it :D
  • GW
    GW Member Posts: 4,693
    Options
    What everyone else said 
    Or go back to the vendor and ask 
    for a “rotated flange” alpha 
    Gary Wilson
    Wilson Services, Inc
    Northampton, MA
    gary@wilsonph.com
  • Le John
    Le John Member Posts: 226
    Options
    Derheatmeister said:

    Rotate head of circ and handles of webstone until it works..
    Have fun wiring it :D

    @Derheatmeister - What do you mean have fun wiring it? I'm wiring this to a Taco Zone Valve Controller? Is it easier to get a Taco VR1816 with universal Flange?
  • Le John
    Le John Member Posts: 226
    Options
    Sometimes you gotta make it fit! Appreciate all the comments - I’m not in the trades but love this site. My wife says I should have been in the trades instead of information technology. 

    Alan (California Radiant) Forbes
  • HomerJSmith
    HomerJSmith Member Posts: 2,441
    Options
    Do you think that the pump may just suck air into the sys thru the vertical air eliminator?
  • hot_rod
    hot_rod Member Posts: 22,158
    Options
    HomerJSmith said:

    Do you think that the pump may just suck air into the sys thru the vertical air eliminator?

    Depends on where the expansion tank is connected
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream

Categories