auto fill ver: shutdown

Discussion in 'Boiler Forum' started by rrekih, Jan 4, 2010.

  1. rrekih

    rrekih New Member

    Joined:
    Oct 4, 2009
    Location:
    Canada
    I am not convinced on using an auto fill for a hydronic system.
    With a fill line connected all the time you could have a small leak for a long time before finding out.
    What if using a switch that upon low pressure would shutdown the system via the AC feed?
    What would be the name of such a pressure switch?
     
  2. nhmaster

    nhmaster Master Plumber

    Joined:
    Jul 30, 2008
    Occupation:
    Tech. Instructor
    Location:
    S. Maine
    we have been using auto fill valves for close to a hundred years now with very few problems.
     
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  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    A boiler that didn't have a low-pressure shutoff probably wouldn't pass the required safety tests. Just what you need if you're out of town and the heat shuts down. I'd feel safer with a small leak and the heat stayed on verses a shut-down system, or one where that switch failed and it flashed to steam, maybe messing other things up as well. I think an autofill is the lesser of two evils...
     
  5. rrekih

    rrekih New Member

    Joined:
    Oct 4, 2009
    Location:
    Canada
    I have a unique situation.
    I don't have a boiler but run a heating box with a tankless hot water heater.
    As for having the heat shutdown while out of town probably isn't a concern where I live. It rarely gets below freezing here.
    My thoughts are if the pressure goes down I shut off the pumps, saving them.
     
  6. Doherty Plumbing

    Doherty Plumbing Journeyman & Gas Fitter

    Joined:
    Jun 22, 2009
    Occupation:
    Red Seal Journeyman Plumber & Licensed Gas Fitter
    Location:
    Penticton, BC
    Put a low water cut off in the system.
     
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