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  • need some help

    I ran a new Radiant heating zone in a basement bath from the existing boiler and baseboard heat zone (See Illustration of the setup I have attached) for some reason I am having problems getting the radiant portion to circulate. I bled the lines and when I disconnect one end of the line from the manifold the hot water does shoot out but when I reconnect it it does not circulate. Any advise would be appreciated.

    jtClick image for larger version

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  • #2
    Re: need some help

    Water always follows the path of least resistance. Your radiant loop is much more resistive to flow than the base board loop and they both share the same return. You may be able to sort it out with a couple of check valves but to do this properly the boiler needs to have "primary \ secondary loop piping with closely spaced tees and a circulator dedicated to the primary loop. Then the other two loops need their own circulators and controls. Check this site out for proper piping diagrams.

    www.heatinghelp.com
    sigpic

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    • #3
      Re: need some help

      Originally posted by NHMaster3015 View Post
      Water always follows the path of least resistance. Your radiant loop is much more resistive to flow than the base board loop and they both share the same return. You may be able to sort it out with a couple of check valves but to do this properly the boiler needs to have "primary \ secondary loop piping with closely spaced tees and a circulator dedicated to the primary loop. Then the other two loops need their own circulators and controls. Check this site out for proper piping diagrams.

      www.heatinghelp.com
      Yes, I totally agree with what was mention above, !

      Comment


      • #4
        Re: need some help

        it does not look like the piping is right try this


        look at this site http://www.houseneeds.com/shop/Heati...rimaryloop.asp
        Last edited by HVAC HAWK; 04-04-2008, 07:37 PM.
        Charlie

        My seek the peek fundraiser page
        http://observatory.mountwashington.o...nal&fr_id=1040


        http://www.mountwashington.org/weather/conditions.php

        new work pictures 12/09
        http://public.fotki.com/hvachawk/

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        • #5
          Re: need some help

          Is it me or is there no return back to the boiler? Why not run a seperate zone for the radiant?

          Comment


          • #6
            Re: need some help

            Did you run a new line with its own pump,the pump needs to be sized according to head pressure and gpm. The tees off the loop need to be close like NH Master said. the tees should be with in 6or 10 pipe size diameters of each other.
            ANYONE CAN TAKE THE HELM WHEN THE SEA IS CALM.

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            • #7
              Re: need some help

              Originally posted by Masterplumb View Post
              Is it me or is there no return back to the boiler? Why not run a seperate zone for the radiant?
              I noticed that also and put it down to a bad drawing.
              sigpic

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              • #8
                Re: need some help

                there is a return to the boiler (forgot to draw it in the pic) I tried to keep this as simple as possible as i am not a plumber by trade but I do however understand plumbing. I figured by using the basement baseboard zone valve and loop and be adding a pump for the radiant portion of the loop it would work. I thought about adding a new zone for the radiant heat but it appears to be more involved.

                jt

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                • #9
                  Re: need some help

                  Originally posted by threequez View Post
                  there is a return to the boiler (forgot to draw it in the pic) I tried to keep this as simple as possible as i am not a plumber by trade but I do however understand plumbing. I figured by using the basement baseboard zone valve and loop and be adding a pump for the radiant portion of the loop it would work. I thought about adding a new zone for the radiant heat but it appears to be more involved.

                  jt
                  it does get involved for a good reason you cant run the same temp water in the slab as you do in base board heat .the floor will get to hot to walk on and it may crack the slab .
                  Charlie

                  My seek the peek fundraiser page
                  http://observatory.mountwashington.o...nal&fr_id=1040


                  http://www.mountwashington.org/weather/conditions.php

                  new work pictures 12/09
                  http://public.fotki.com/hvachawk/

                  Comment


                  • #10
                    Re: need some help

                    doesn't the mixing valve take care of that?

                    Comment


                    • #11
                      Re: need some help

                      Vistit this site www.heatinghelp.com
                      Get a hold of a copy of Pumping Away. It's a short paperback tutorial on hydronic heating, piping. Worth it's weight in gold. You're probably not going to want to hear this, or for that matter believe this, but if you want this to work right, you will need to tear it apart and re-pipe it correctly.
                      sigpic

                      Comment


                      • #12
                        Re: need some help

                        Originally posted by NHMaster3015 View Post
                        Vistit this site www.heatinghelp.com
                        Get a hold of a copy of Pumping Away. It's a short paperback tutorial on hydronic heating, piping. Worth it's weight in gold. You're probably not going to want to hear this, or for that matter believe this, but if you want this to work right, you will need to tear it apart and re-pipe it correctly.
                        i have that book now for 15yrs or so and still go back to look at it for info at times . i also have one of his books on steam .
                        Charlie

                        My seek the peek fundraiser page
                        http://observatory.mountwashington.o...nal&fr_id=1040


                        http://www.mountwashington.org/weather/conditions.php

                        new work pictures 12/09
                        http://public.fotki.com/hvachawk/

                        Comment


                        • #13
                          Re: need some help

                          Originally posted by NHMaster3015 View Post
                          Vistit this site www.heatinghelp.com
                          Get a hold of a copy of Pumping Away. It's a short paperback tutorial on hydronic heating, piping. Worth it's weight in gold. You're probably not going to want to hear this, or for that matter believe this, but if you want this to work right, you will need to tear it apart and re-pipe it correctly.
                          I've been hearing about this book too. The author has more good books on the subject too.
                          ANYONE CAN TAKE THE HELM WHEN THE SEA IS CALM.

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