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Noisy Taco pump

JBB
JBB Member Posts: 23
in Radiant Heating

Question; My Taco pump is noisy the way it is currently installed.The out flow from the pump goes into the water heater drain port. Does anyone know if the drain could be a one way out that cannot flow in? I purged with water thru the system, and the pump is quiet. When I close the water flow, the pump makes a surging noise. Should I use the water heater hot and cold for the closed hydronic loop setup? This I replaced in system that worked well until I had to replace the water heater.

Comments

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 18,623

    Could you post some pictures so we can see what is going on?

    Larry WeingartenJBB
  • hot_rod
    hot_rod Member Posts: 25,747

    is this a DHW recirculation pump?

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • JBB
    JBB Member Posts: 23
    1000001492.jpg 1000001494.jpg 1000001493.jpg 1000001503.jpg 1000001496.jpg 1000001503.jpg 1000001505.jpg
  • JBB
    JBB Member Posts: 23

    Yes, for underfloor heating.

  • Grallert
    Grallert Member Posts: 991

    Are you also getting your DHW off of that water heater?

    Miss Hall's School service mechanic, greenhouse manager, teacher, dog walker and designated driver

  • Larry Weingarten
    Larry Weingarten Member Posts: 3,968

    Hi, If there were a valve in the horizontal line at the heater drain, you could close that and really flush the lines, removing all of the air. Without that valve, it's hit and miss. 😐️

    Yours, Larry

  • hot_rod
    hot_rod Member Posts: 25,747

    does it do the hot water also? Seems like a lot of lines connected to the tank? T Wed o on top one on bottom

    Usually hydronics has a supply and return.

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • JBB
    JBB Member Posts: 23

    Larry, there are isolation valves on each side of the pump. When I ran the water thru the system, I ran the pump also. The pump flow is thru the water heater drain, and out thru the hot inlet of the water heater. Should these be reversed?

  • JBB
    JBB Member Posts: 23

    Bob, see the above comment. I will make a sketch to clear things up, and post it

    The home's hot water and the underfloor hydronic system are two separate water heaters.

  • hot_rod
    hot_rod Member Posts: 25,747

    Most water heaters now have “heat trapper” nipples on top. Basically a small flapper or ball inside the nipple to eliminate gravity flow. It acts as a weak check valve .

    It may be enough obstruction to starve the pump.

    IMG_1170.jpeg
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Larry Weingarten
    Larry Weingarten Member Posts: 3,968

    "Larry, there are isolation valves on each side of the pump. When I ran the water thru the system, I ran the pump also. The pump flow is thru the water heater drain, and out thru the hot inlet of the water heater. Should these be reversed? " … Hi, It looks like the heater drain can get water both through the pump and from the tank. It's simpler for water to flow from the tank. If water could flow only from the return line and pump, household pressure could be the driver, rather than just the small pressure the pump can create. This will remove any air from the lines. You may be surprised to get discolored water as well as it scrub the lines that have only seen slow flow. I've been in this position many times and adding the valve has always worked.

    Yours, Larry

  • JBB
    JBB Member Posts: 23

    Ɓob, there are these on̈ both hot and cold inlet ripples. So, this would restrict the flow? Can I remove these, or just replace the ripples? Sounds like this is the problem.

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