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Plumbing Mystery Help?

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  • Plumbing Mystery Help?

    I posted a pic of an old B&G pump that was dead on a recirc line & they wanted replaced.

    They did have functioning hot water with the dead pump.

    I replaced the pump with a Taco 009 & now they only get warm water for a few seconds-then it goes cold.

    I've told them to shut the pump off and report back.

    Any clue as to why it's acting this way?

    Thanks.

    J.C.

  • #2
    Re: Plumbing Mystery Help?

    B&G thread.

    http://www.ridgidforum.com/forum/showthread.php?t=23264

    J.C.

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    • #3
      Re: Plumbing Mystery Help?

      When you blew out the return line did it get hot?

      Comment


      • #4
        Re: Plumbing Mystery Help?

        Yes.

        Doesn't make sense. Acts like a cross connection that's only there sometimes or a possible intermittent air lock.

        J.C.

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        • #5
          Re: Plumbing Mystery Help?

          Pumping the wrong direction?

          Comment


          • #6
            Re: Plumbing Mystery Help?

            Thanks Herk. But no the pump direction is correct.

            I was unable to get there but spoke to the maintenance person throughout the day. I had him go through different frustrating tests to try and determine what's going on from the phone.

            I think it may have dropped a gate valve on the inlet side partially causing water to reverse feed the fixtures.

            Try and find out tomorrow.

            J.C.
            Last edited by BobsPlumbing; 02-11-2009, 04:22 PM.

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            • #7
              Re: Plumbing Mystery Help?

              is the pump going ito the bottom of the tank or the top?
              Mike
              Clark County Plumbing And Drain
              www.plumbinginclarkcounty.com

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              • #8
                Re: Plumbing Mystery Help?

                The pump feeds into the bottom of the heater.

                J.C.

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                • #9
                  Re: Plumbing Mystery Help?

                  The higher head pump could be pulling cold water through the single handle tub faucets (or elsewhere) back into the hot side

                  Make sure all your check valves are in place and facing the right direction

                  Comment


                  • #10
                    Re: Plumbing Mystery Help?

                    Originally posted by plumberscrack View Post
                    The higher head pump could be pulling cold water through the single handle tub faucets (or elsewhere) back into the hot side

                    Make sure all your check valves are in place and facing the right direction
                    Interesting point. This is a church and I think I recall seeing only 1 single handle kitchen sink on the top floor.

                    They do have multiple Watts (I think) temp control valves on many lavs though.

                    I did not discount anyones advice on pumps either. The 009 was what was available and the pump curve seemed correct for the application. (Low flow-high head). The heater is on the ground floor.

                    J.C.

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                    • #11
                      Re: Plumbing Mystery Help?

                      Originally posted by Herk View Post
                      Pumping the wrong direction?
                      Bad Check valve?

                      Comment


                      • #12
                        Re: Plumbing Mystery Help?

                        Originally posted by EasyEman View Post
                        Bad Check valve?
                        Don't think so, but I'll check again.

                        Thanks.

                        J.C.

                        Comment


                        • #13
                          Re: Plumbing Mystery Help?

                          Does the close in return line upstream from the pump and check valve get hot when the pump is running? If so, when this line is hot do you experience warm water for a few seconds-then cold at the various fixtures?

                          Comment


                          • #14
                            Re: Plumbing Mystery Help?

                            I had to leave last night at around 9 p.m. right when I got the pump in and building purged. The line was not hot or warm with the pump running when I left. I have no idea about how much pipe is in here or where it goes though.

                            The maintenance person said today the line was not hot today either when he got there this morning.

                            J.C.

                            Comment


                            • #15
                              Re: Plumbing Mystery Help?

                              Do you have isolation valves on both sides of the new pump as recommended by most pump manufacturers? Are you absolutely sure that when you purged the line you were not pulling from the bottom of the tank? When you did purge the line, the return piping was hot? If so I am leaning towards a check valve or flow issue between the pump and the heater.

                              Comment

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