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  • hydronic radiant heating problem

    This is a 3 story apartment building. I have one resident on the second floor without any heat coming from the hot water baseboard heater.

    I have changed the thermostat, zone valve, zone vale motor, bleed off the air at the vent in all 3 suites down stream of this line.

    This suite is the first suite on that particular floor.

    The pipe is hot just before the shut off valve going into the suite and hot after the valve leaving the suite.

    I have run into air locks before in this building on the upper floors and usually had success bleeding it off but there is no air in this line. I must have drained out 4 gallons .

    Any idias ??

  • #2
    Re: hydronic radiant heating problem

    is there a valve shut off that is stopping the flow ?

    is there a valve on the return side ? if so i like to put a boiler drain valve on the supply side of the valve so i can shut the return valve and put a hose on the boiler drain and run it until the hose gets hot . that way i know all the air is out .
    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


    • #3
      Re: hydronic radiant heating problem

      The walls are enclosed so I cant tell. When I opened up the zone valve and and cracked open the valve there is plenty of hot water. When I go to the other end of the run the valve and pipe are hot as well.

      When I open up the air vent at the other end of the run the water is hot as well.

      Its almost like the water isn’t getting past the zone valve? When I removed the old one it looked like everything was ok Just to be on the safe side a put a brand new one in. My heart tells me an air lock but I have never had a problem on the second floor of this building before.

      P.S the only valve on the return is at the boiler?

      Comment


      • #4
        Re: hydronic radiant heating problem

        make sure you shut off one side at a time when bleeding to be shure supply and return both get bleed because if you bleed at the end just that riser gets bleed not whole baseboard jeff

        Comment


        • #5
          Re: hydronic radiant heating problem

          Be sure the pump is fully funtioning. Bad or worn impeller will still circulate water but not as much as it should.

          Try to shut down all other lines except the one thats not heating and use the pump to move the air to where it can be bled out

          Comment


          • #6
            Re: hydronic radiant heating problem

            I’m pretty sure the pump is ok there are 140 other suites in there that don’t have any problems as of yet.

            I have isolated one valve at a time in the apartment I don’t here any air blowing out with water like I normally here when I approach a problem like this. Perhaps 4 gallons isn’t enough???


            Comment


            • #7
              Re: hydronic radiant heating problem

              ttt

              Comment


              • #8
                Re: hydronic radiant heating problem

                What's up with the ttt? hey your spell check is broken.Idia is spelled Idea.

                happy bithday

                Comment


                • #9
                  Re: hydronic radiant heating problem

                  TTT

                  To

                  The

                  Top

                  Comment


                  • #10
                    Re: hydronic radiant heating problem

                    Any other sujestions?

                    Comment


                    • #11
                      Re: hydronic radiant heating problem

                      If its copper fintube baseboard you can try installing a self piercing saddle valve where the pipe is cold and bleed from there. Have you looked for any balancing valves that may have been readjusted?

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                      • #12
                        Re: hydronic radiant heating problem

                        I don’t have any balancing valves on the system but did notice one of the 2 recirc pumps leaking water from the mechanical seal?

                        Once again only the one apartment with this problem. I will try the saddle tomorrow morning. Once again thx for you help.

                        Comment


                        • #13
                          Re: hydronic radiant heating problem

                          1 is each apartment on its own zone or zone valve .ok i looked back it is zone valves ,does the pipe get hot 3ft away frome the valve when it opens

                          2 how is it piped ,comes up through the floor and goes up and down for each room

                          3 does each apartment zone come off a main with one supply and return .

                          4 try to give us a rundown on the system ,pictures also work well .
                          Last edited by HVAC HAWK; 12-09-2007, 08:36 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/

                          Comment


                          • #14
                            Re: hydronic radiant heating problem

                            Well turns out the water is frozen in the pipe underneath the floor. Its 3/4 copper pipe dropping down then turns into cpvc.

                            I tried a coat hanger to jam the ice out dropped salt in the line and put a compressor with 30 pounds in hopes of blowing the ice out and no go.

                            Then went to the floor below to cut the ceiling out. Cut out the drywall then with my luck there is a structural beam just above that. Cut a few more holes and I still cant locate this pipe ??

                            With this being on an outside wall would the original installers run this plastic pipe a different route??

                            Any tricks to getting this 5 foot piece of pipe thawed??

                            Comment


                            • #15
                              Re: hydronic radiant heating problem

                              i cant believe that they used cpvc pipe for heating

                              can you post some pictures .I'm not sure about keeping the cpvc pipe in there .
                              if you can get to the pipe use a hair dryer to heat up around the pipe ,but you will have to get to the pipe the replace it with copper and insulate it and find where the cold air is coming in .
                              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

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