Zone Valve help

Discussion in 'Boiler Forum' started by plumber69, Dec 2, 2019.

  1. plumber69

    plumber69 In the Trades

    Joined:
    Jun 20, 2014
    Location:
    Prince Rupert, British Columbia
    Im confused weather I need a normally open or normally closed zone valve. With thermostat off the lever is loose, leaving me believe the zone valve is open. So would i need to put in a normally closed
     
    plumber69, Dec 2, 2019
    #1
  2. Stuff

    Stuff Well-Known Member

    Joined:
    Mar 7, 2013
    Location:
    Pennsylvania
    If replacing it maybe the loose lever is a part of the failure?

    Rare to have a NC valve. With thermostat calling for heat does the valve get power? Then check with no heat call.
     
    Stuff, Dec 2, 2019
    #2
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  4. plumber69

    plumber69 In the Trades

    Joined:
    Jun 20, 2014
    Location:
    Prince Rupert, British Columbia
    i changed it but with thermostat off the lever is loose, if I crank the heat the lever closes and is stiffer
     
    plumber69, Dec 2, 2019
    #3
  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    Most that I've seen (not a lot!) use the motor to open the valve and rely on the spring to push it back closed when power is removed. SO, those I'm familiar with are normally closed. Using the manual open lever is pushing against the spring, so would likely get tighter as you open the valve.
     
    jadnashua, Dec 2, 2019
    #4
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