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Zone Valve Issues On New Boiler

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Rizz861
Rizz861 Member Posts: 52
So this particular boiler has 3 zone valves (caleffi) and a Taco 007 F5 pump. The HO is experiencing water hammer only when zone two is closing. There were no CV I could see and the ZV and pump are the right direction. ZV are on supply. Any ideas?

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  • hot_rod
    hot_rod Member Posts: 22,151
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    Is the pump being controlled by the end switch? The pump should stop spinning when the zone valve starts to close. Tubing that is not secured tightly can cause some noise also when a valve closes.
    Where are you located?
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Big Ed_4
    Big Ed_4 Member Posts: 2,785
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    The zone valve should be piped on the opposite end from the circulator location ...

    There was an error rendering this rich post.

    worldclasshvac
  • kcopp
    kcopp Member Posts: 4,432
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    Installing a Delta P pump would help. Grundfos 15-55 or the like.
  • Joe Mattiello
    Joe Mattiello Member Posts: 707
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    Are you still experiencing hammer? Which valve do you have?
    contact Taco  at 401-942-8000 and ask for tech support. 
    Joe Mattiello
    N. E. Regional Manger, Commercial Products
    Taco Comfort Solutions
  • HomerJSmith
    HomerJSmith Member Posts: 2,440
    edited February 20
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    What is water hammer? Is it the momentum of a flow of water crashing against a stop? hmmm
    What is that telling you? Maybe the flow in that particular zone is excessive? Maybe the zone valve is closing too fast? Honeywell ZVs have two return springs in which case I have removed one spring with success in reducing water hammer allowing the valve to close slower. Caleffi may only have one spring, I don't know.
    I always use balancing valves not only to balance flows thru the system but to regulate the flow thru a given circuit. I have also put a washing machine water hammer air arrester on the offending zone's hose bibb with success.
  • HomerJSmith
    HomerJSmith Member Posts: 2,440
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    @Big Ed_4
    The zone valve should be piped on the opposite end from the circulator location
    Why is that? Inquiring minds want to know. In an open sys flow has a relationship to pressure. The more pressure the greater the flow. In a closed sys the flow is the same in every part of the circuit. That's what I thought, but I may be wrong on that. I am interested in what you think.
  • Jamie Hall
    Jamie Hall Member Posts: 23,313
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    @Big Ed_4

    The zone valve should be piped on the opposite end from the circulator location
    Why is that? Inquiring minds want to know. In an open sys flow has a relationship to pressure. The more pressure the greater the flow. In a closed sys the flow is the same in every part of the circuit. That's what I thought, but I may be wrong on that. I am interested in what you think.
    Almost. The ringer in the deck is that if a pump stops quickly enough it generates a negative pressure -- not flow -- wave in the pipe, and that can be a source of hammer. If a valve closes quickly against flow, it will create a positive pressure wave, and that can hammer. I don't think it really makes a whole lot of difference, though, whether the pump and the zone valve are close together or not...
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • Big Ed_4
    Big Ed_4 Member Posts: 2,785
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    With a spring loaded zone valve , it is best to add resistance between the valve and pump . A buffer , Helps to prevent this type of call ..

    There was an error rendering this rich post.

  • hot_rod
    hot_rod Member Posts: 22,151
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    It is the flow and the speed or velocity of the fluid that the valve is closing against. It should not matter if the valve is on supply or return. A 007 should not be causing an issue with any spring return zone valve.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    HomerJSmith