Pump question!

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Kungur
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Post by Kungur » Tue. Mar. 02, 2021 5:55 pm

Do circ pumps size up from not being run? I have 2 zones that we really don't use and when I tried jumping the circuit it doesn't seem like the pump is operating. They are Grundfous (sp?).

 
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Rob R.
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Post by Rob R. » Tue. Mar. 02, 2021 6:02 pm

Yes, it can happen. The older Grundfos circulators were known for it. Make sure you have power at the circulators before you assume the are stuck.

If you confirm they are stuck, kill the power and isolate the circulators from the rest of the system. See if there is a screw in the middle of the motor that you can remove. If so you should be able to remove it and manually turn the impeller to break it free.

If all else fails, pull the motor and cartridge right out of the housing and get things freed up.

 
Kungur
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Post by Kungur » Tue. Mar. 02, 2021 8:37 pm

Another chore!
Thanks!!


 
Kungur
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Post by Kungur » Wed. Jul. 14, 2021 8:25 am

Finally got around to working on the pumps. Maybe I am be too cautious but I just ordered 2 replacements even though the first one I removed "broke loose". I don't relish the idea of a mid heating season repair. The "used" pumps will go on the shelf.

 
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Freddy
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Post by Freddy » Wed. Jul. 14, 2021 9:20 am

When I was doing plumbing.... at least a dozen times we got one loose with a single hammer thump.

 
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franpipeman
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Post by franpipeman » Thu. Jul. 15, 2021 7:56 am

all the above cures work. I also want to promote exercise say turn you pump s on once a month. If you can pipe your system with a modern condensing boiler many of them have a once every two weeks excercise cycle that turns the pumps on for a minute to prevent these types of seizures


 
Kungur
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Post by Kungur » Thu. Jul. 15, 2021 8:31 am

I have already planned to make sure the pumps get run at least once a month.
Just a thought. Should I be running them occasionally during the off season?

 
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Rob R.
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Post by Rob R. » Thu. Jul. 15, 2021 8:54 am

It is a good idea. Some controls even have a "pump exercise" feature for that reason.

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