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Loud Circulating Pump (Steam Boiler)

itsuke
itsuke Member Posts: 10

Hello everyone,

I had some work done on my Steam Boiler which included the replacement of the old circulating pump as it was dead. The old pump was a Taco 007-F5-7IFC. The service tech brought out the same pump but the one without the IFC (007-F5) and its making some weird loud noises.

It's important to note that these noises do not start immediately after the pump goes on (call for heat) but after the boiler has created steam for the condensate to return and run on that baseboard loop where the circulating pump is connected.

I have tried the usual of getting any air out of the system to no avail. I attached a short clip so you all can hear what it sounds like. Could the flow check missing in the new pump cause this? The two pumps have the same HP rating of 1/25.

Link to video:

Link to the old pump: https://shorturl.at/fkYWo

Link to the new pump:

https://shorturl.at/Medx4

I would appreciate any help with this.

Thank you all and happy holidays.

Comments

  • Joe Mattiello
    Joe Mattiello Member Posts: 724

    try increasing the pressure on that loop.

    If your pumping condensate you might be flashing because of high vapor pressure.

    Joe Mattiello
    N. E. Regional Manger, Commercial Products
    Taco Comfort Solutions
    EBEBRATT-Ed
  • itsuke
    itsuke Member Posts: 10

    @Joe Mattiello how would I increase the pressure? This is a loop running below the water level of a steam boiler, the return side feeds the loop.

    Thank you

  • Ironman
    Ironman Member Posts: 7,569

    That’s the wrong pump for that application. A wet rotor circulator should not be used, nor should it be iron. You should have a bronze or stainless three piece circulator like a B&G series 100 or the Taco equivalent.

    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 16,584

    Bronze or stainless pumps are expensive but will last a lot longer. Cast Iron pumps are not the best for an open system.

    Can you take some still picture of the piping and pump and how it connects to the boiler?

    Don't know if with the check valve out it may have increased the flow causing it to cavitate?

  • itsuke
    itsuke Member Posts: 10

    @Ironman can you explain why? also, could you advise on a model number pump i should use?

    thank you for your help