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Pool heater help

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  • Pool heater help

    Went on a service call today for a customer whose pool water is not heating up. Its a Teledyne Laars 250,000 btu, unit fires up nice and seems to be operating normally. Pool water just doesnt seem to be getting hot. He says usually after a few hours the supply pipe to the pool is hot to the touch. Customer had the heater goinfg for 4 hrs before I got there and water coming out of the heater was luke warmm at best. Filter and all seem to be clean, customer says that he hasnt had to add water at all (rules out leaks) Any ideas?

  • #2
    Re: Pool heater help

    It sounds like the pump is not working. Obstruction? Bad impeller? etc.
    Water Heater Reviews & Water Heater Information

    Comment


    • #3
      Re: Pool heater help

      if the inside of the pipe has a build up in side the boiler it will not heat up .
      check the fins on the out side of the coils to see if they are clean ,if they are dusty they will not transfer the heat well .

      does the boiler have a high and low fire ,the high fire my not be working
      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


      • #4
        Re: Pool heater help

        Originally posted by Service Guy View Post
        It sounds like the pump is not working. Obstruction? Bad impeller? etc.
        this boiler has a flow switch on it and it will not light if there is no or low flow
        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


        • #5
          Re: Pool heater help

          Originally posted by Service Guy View Post
          It sounds like the pump is not working. Obstruction? Bad impeller? etc.
          Pump seems to be fine as pumped water has sufficient pressure as water enters the pool. Thanks for the reply though.

          Comment


          • #6
            Re: Pool heater help

            Originally posted by HVAC HAWK View Post
            if the inside of the pipe has a build up in side the boiler it will not heat up .
            check the fins on the out side of the coils to see if they are clean ,if they are dusty they will not transfer the heat well .

            does the boiler have a high and low fire ,the high fire my not be working
            Thanks Hawk, this was my thought and I will check it when I return. Everything else seems to be operating correctly. If I remove the jacket and the coil seems to be clean do you think it could be some sort of buildup INSIDE the coil? If so how sould I approach flushing it? Or can it be flushed? Thanks for your help.

            Comment


            • #7
              Re: Pool heater help

              Originally posted by HVAC HAWK View Post
              if the inside of the pipe has a build up in side the boiler it will not heat up .
              check the fins on the out side of the coils to see if they are clean ,if they are dusty they will not transfer the heat well .

              does the boiler have a high and low fire ,the high fire my not be working
              I didnt check to see if it was a high/low fire boiler. The flame was nice and blue throughout and it appeared as if it was in "high" fire. How would I tell if it was 2 stage?

              Comment


              • #8
                Re: Pool heater help

                First off the delta t through a pool heater is and should be very low. (we don't want to be burning the swimmers) The pool pump will push water way too fast through the heater. There should be a by-pass valve located between the inlet and outlet to slow down the flow. If the installation instructions are still on site, check the recomended piping diagrams.
                sigpic

                Comment


                • #9
                  Re: Pool heater help

                  Originally posted by NHMaster3015 View Post
                  First off the delta t through a pool heater is and should be very low. (we don't want to be burning the swimmers) The pool pump will push water way too fast through the heater. There should be a by-pass valve located between the inlet and outlet to slow down the flow. If the installation instructions are still on site, check the recomended piping diagrams.
                  I agree about the delta t, what should it be 10-15*? There is no bypass valve and the manual was not on site, unit is 10 years old. Thanks for your help.

                  Comment


                  • #10
                    Re: Pool heater help

                    Master, sorry, just off a phone call from a guy who thinks I enjoy being browbeat at 11:15 pm on price and wrapped up 2 estimates.

                    I had to pull some serious strings to get this info, I owe people in high places now, but I was able to fanagle this info for you...here:
                    Jandy, manufacturer of swimming pool and spa products including pumps, filters, heaters, control equipment, valves, water fea...

                    Hopefully the model# of your unit is there, if not it's at least a start.
                    Very surprizing how many mfg's have specs & manuals online now...to them it's probably just cheaper than paying someone to pretend they understand your questions.

                    Comment


                    • #11
                      Re: Pool heater help

                      Yes 10 to 15 degrees delta t is about right. Normal piping is usually 2" ( copper within 3' or so of the heater) with an 1 1/4 bypass betweent inlet and outlet. Valve on by pass. With the heater running the outlet will initially run within a couple degrees of inlet untill the pool temp rises.
                      sigpic

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                      • #12
                        Re: Pool heater help

                        Thanks for the help. I will let you guys know the outcome when I return there.

                        Comment


                        • #13
                          Re: Pool heater help

                          go to this site and look at the manual and you will see how this should be piped out
                          this is not your boiler but the piping is the same for all of them
                          i tried to copy but could not

                          http://www.laars.com/document_downlo...rcial&photo=AP
                          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: Pool heater help

                            Teledyne copper fintube boilers are famous for clogged heat exchangers. I serviced my Teledyne every year and it still set off the carbon monoxide detector. Pull the burners out and look at the bottom of the heat exchanger with a mirror and light. If it's heavily sooted you are looking at a 2-4 hour cleaning.

                            Pool heaters won't heat the pool up in 4 hours. Usually takes a few days to bring it up to a comfortable temp.

                            NHMaster is right about the bypass. It definately should have one. If it doesn't the heat exchanger will soot up.

                            Check the manifold gas pressure.

                            Any company that can't make a decent waterpik, shouldn't be in the boiler business IMO
                            Last edited by plumberscrack; 05-29-2008, 04:25 PM.

                            Comment


                            • #15
                              Re: Pool heater help

                              this is a bypass on a boiler
                              the valve in the middle is to adjust it so your not having 100% cold water going back into the boiler .this will keep the coil from condensing

                              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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