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  1. #14
    Join Date
    Aug 2012
    Location
    Norman Ok
    Posts
    8
    Post Likes
    Yeah there great to have got one on the key chain and one in the truck got mine from the grundfos rep

  2. #15
    Join Date
    Jul 2012
    Location
    CT
    Posts
    235
    Post Likes
    Thanks puff-noeyebrows that would be great.

  3. #16
    Join Date
    Dec 2004
    Location
    Caledonia WI
    Posts
    907
    Post Likes
    Pm me with your address and I will send you one Monday.

  4. #17
    Join Date
    Aug 2012
    Location
    Norman Ok
    Posts
    8
    Post Likes
    Name:  20130701_135109.jpg
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Views: 555
Size:  252.5 KB

  5. #18
    Join Date
    Aug 2001
    Location
    Pavilion, NY
    Posts
    2,266
    Post Likes
    I want one!
    ...

  6. #19
    Join Date
    Jun 2013
    Location
    Austin, TX
    Posts
    641
    Post Likes
    One trick I have used to check for AC magnetic fields is to take a Hall current probe, hold it open, and wave it around the motor or whatever. You can't get a quantitative measurement out of it but you can check for current in the windings without even removing the cover. (Particularly well shielded motors and transformers might not give any measurable magnetic field, but you probably won't see any in HVAC.)

  7. #20
    Join Date
    Jan 2011
    Location
    Ottawa, Canada
    Posts
    425
    Post Likes
    Viessman gave them away when we had training for their boilers... Cept th writing is in German!

    Sent from my SGH-I747M using Tapatalk 4 Beta

  8. #21
    Join Date
    Dec 2010
    Location
    ND
    Posts
    1
    Post Likes
    These can be found at vjkindicator.com for approx. $5.00 ea. Just ordered a couple after the boss lost a similar one. I hope this helps.

  9. #22
    Join Date
    Dec 2002
    Location
    in a house, Appomattox, Va.
    Posts
    3,613
    Post Likes
    You can unscrew the cap off end of some circulators and see the end of shaft spinning
    Col 3:23


    questions asked, answers received, ignorance abated

  10. #23
    Join Date
    Aug 2009
    Location
    Ottawa ON
    Posts
    59
    Post Likes
    I have had to open the end cap. The grundfos tester only shows the presence of a rotating mag field in the windings. Not if the stator is actually moving.
    The one I had was seized but the tester showed me it was working

  11. #24
    Join Date
    May 2007
    Location
    Central NJ Area
    Posts
    936
    Post Likes
    Use your amp probe to see if the circ pump is operating. Check the rated motors amp draw on the plate. High amp draw the motor or impeller is most likely seized. No amp draw with voltage applied most likely open winding. Low amp draw would indicate that the impeller is not spinning and just the motor is. Just use your electrical knowledge to diagnose the pump. You could also check delta t across the boiler to see if its moving the water at the right GPM, only if the boiler is fired properly according to your combustion analyzers reading.

    That little tool is pretty cool though. I like to have one!

  12. #25
    Join Date
    Jan 2014
    Location
    Idaho
    Posts
    143
    Post Likes
    Quote Originally Posted by Zionone View Post
    Name:  20130701_135109.jpg
Views: 537
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Views: 555
Size:  252.5 KB
    These work awesome for checking if a solinoid is energized. You can feel the magnetic field much better than with a small screw driver.


    Sent from my iPhone using Tapatalk

  13. #26
    Join Date
    May 2007
    Location
    Central NJ Area
    Posts
    936
    Post Likes
    They make a magnet to move on reversing valves, or testing them. They come in really hand when working on heAt pumps and to check their is no delta t across the inlet and out let of the reversing valve.

    I use a screw driver sometimes to check to see if the solenoid is energized and working. You can feel the pull on the scredriver tip.

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