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Taco 007 running hot?

GW Member Posts: 4,679
I have a new job where we have a 007 running at constant circulation here in Mass, so today it certainly shouln't be too hot. The owner called; I guess I can swap it out but wondered what might cause this. The heat is working, so air bound is not likely the case. Thanks for any help.

Gary Wilson
Gary Wilson
Wilson Services, Inc
Northampton, MA
[email protected]


  • oil-2-4-6-gas
    oil-2-4-6-gas Member Posts: 641

    too hot is a relative term do you have temperature readings--ie..water temperature versus circulator motor temperature ?
  • GW
    GW Member Posts: 4,679

    Somehow I thought I'd get that resonse! Anyways, the pipe can easily be grabbed onto firmly (like I said, outdoor reset control and today was a pretty mild day, about in the 40s/50s or so, we're feeding CI rads of a Buderus 2107 control).

    But the pump is smoking hot; can hold onto the motor for about two seconds.

    So, 130* water but 180* pump.

    Thanks, gary

    Gary Wilson
    Wilson Services, Inc
    Northampton, MA
    [email protected]
  • hr
    hr Member Posts: 6,106
    They get very hot

    when they are stuck! It happens :) If you have iso valves you might pull iut to make sure it spins.

    Grundfos circs run about the same temperature as the fluid they are circulating, being a wet rotor pump :)

    hot rod

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  • Kal Row
    Kal Row Member Posts: 1,520
    The taco stator windings get physically hotter...

    take them apart and look at them carefully and you will see the differences – the looses are negligible at run-time except for heat diff – which also doesn’t matter – but the differences in the rotor give the Grundfos bettor starting torque
  • Weezbo
    Weezbo Member Posts: 6,232
    here are a few things that might cause that...

    closed valve.air you thought was nt in the mix.some small impediment (wood chip,solder,mud from poor water,smal piece of electrical insulation basically,forigen "debris") every now and then i notice the taco is running shearing hot...i have had the help of my rubber mallet i keep in the "Rubber Room" :) .........to loosten its memory a bit.*~/:) speaking of Jhonathan Winters :) There was a guy God probably had slated to be a plumber who managed to slip through the cracks:) (a closed valve dont allow flow)(an air lok in the piping at the pump)(any impediment that produces the effect of closing the valve )(Any thing that Binds the impeller can some times be freed by use of a rubber mallet and some elbow grease applied to the pump)anypiece of debris that gets wedged into a pipe that has internal passage ways that have been compromised by water quality within the tubing can also make thepump runn and overtemp because its trying to get some flow happening and as it is unable to do that it dead heads and the water temp in the pump gets hotter and hotter because it isnt dissapaiting any of the heat being generated...consider it no longer a pump, consider it a resistance load..of x watts.snatch a hold of a 60 watt light bulb thats been on for a while..its hot because it is a resistance load.
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