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  1. #1
    Join Date
    Apr 2004
    Location
    Maryland
    Posts
    522
    What is the correct place to put the fill valve/reducing valve on a boiler. I have seen it piped both into the supply and into the return the past couple days. On another install it was piped into the top of the expansion tank below the air scoop. Is there a correct place to pipe it into. Like I said i have seen it done both ways lately and am curious.


  2. #2
    Join Date
    Jun 2002
    Location
    Bemidji, Mn
    Posts
    3,573
    I dont think it really matters, but I go with the direction of flow, incase of check valves....
    You picked a fine time to leave me loose wheel...

    http://rapalaguy.spaces.live.com/

  3. #3
    Join Date
    Mar 2005
    Location
    Suppy NC
    Posts
    4,517
    i always tap in to the return at the bottom of the boiler

  4. #4
    Join Date
    Jun 2003
    Location
    New Hampshire
    Posts
    2,666
    They all work but the ideal place is at the expanion tank if the cirulator is piped to pump away from the expansion tank. The expansion tank is the point of no pressure change. So when the circulator runs, the circulator won't suck in fresh water from the pressure reducing valve.

  5. #5
    Join Date
    May 2004
    Location
    Soside Chicago
    Posts
    377
    oil mans right!

  6. #6
    Join Date
    Sep 2001
    Location
    East Stroudsburg, PA
    Posts
    13,215
    Originally posted by oil lp man
    They all work but the ideal place is at the expanion tank if the cirulator is piped to pump away from the expansion tank. The expansion tank is the point of no pressure change. So when the circulator runs, the circulator won't suck in fresh water from the pressure reducing valve.
    This is the ONLY way to do this.

  7. #7
    Join Date
    Jan 2002
    Location
    New Hampshire
    Posts
    1,285

    I concur

    Only do it like oilman said.

    Noel

  8. #8
    Join Date
    Sep 2004
    Posts
    654
    yup, oilman is right, but I still like installing them on the return. That way when purging a zone, when the hot water is purged out, you know you got the entire loop flushed of air. The only time I've seen an overpressurized system is when the feed valve is piped directly above the circulator.


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