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figuring out a loop

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  • figuring out a loop

    I currently have a gravity fed radiant heating system in my house. I want to upgrade to a pumped system, but want to keep the old fashioned radiators. Is there any way of figuring out the loop? I need to know this so I can get the right stuff for the job. Figuring out the right size expansion tank is also a concern. The boiler I have chosen is the prestige PS110 condensing gas boiler. It has a grundfos UP15-58 pump in it. my house is approximately 800 sq ft per floor with 3 floors. the main floor and the upper floor will be heated with about half the basement to come later. I was looking at making my system in 3 zone system, 1 for each floor. I want to zone the system with Taco Zone Valve - EBV Series - 3/4 inch 24 Volt TACE075C2-3...0.75"...and control them with a Taco Zone Valve Controller - 3 Zones - 24 Volts - Taco ZVC-403...controler. this would give me a thermostat on each floor. Is the pump in the boiler enough, or would I need a pump for each zone which would mean a pump controller instead of a zone controller....please, any input would be greatly appreciated

  • #2
    Re: figuring out a loop

    Impossible to advise without seeing the current piping layout and the radiators themselves.
    sigpic

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    • #3
      Re: figuring out a loop

      Well the boiler is an old coal conversion with 2 zones. The radiators are all supplied with 0.75" steel pipe(1") outside diameter. They also have a return of the same. The mains seem to have an outside diameter of 2". I plan on constructing a manifold so that each radiator will be off of that instead of branching off the main. I plan on using 0.75" pex for this, but could go to 1" pex if need be. I have 2 different size radiators in my house...one is a low to the ground type which are 12" deep and 18" tall...one has 35 rungs and 2 have 29 rungs. The other ones are 8" deep and 34" tall...one has 12 rungs one has 11 rungs one has 6 rungs and 3 have 7 rungs. one zone would have all the low ones and 2 of the tall ones with 7 rungs and the rest would be on the second zone.

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      • #4
        Re: figuring out a loop

        If you have traced the supply and return pipes and have a way to manifold them then if piped there properly...yes the Grundfos 15-58 on spd 3 should flow the system just fine. Closed loop systems need less pump than you think. As for expansion you will be safe using a #30 tank for hydronic systems. This is easy to tell, it will have a precharge of 12 psi and a 1/2" male thread. Be careful using PEX though...make sure it is heat pex or HPEX. Otherwise, O2 will destroy your system in a few years.
        Kevin

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        • #5
          Re: figuring out a loop

          the #30 will likely be a enough expansion tank for the system volume you're talking about... but there's a reason they make bigger ones

          without getting in a several page discussion about pump sizing, i'd start on speed 2 with your 15-58

          I would recommend consulting with a pro, and maybe even having them do some of the work.

          Heating systems are important to get right. Throwing a "average" pump and expansion tank at it and calling it good isn't really the best plan.

          If a pro gets it wrong, you at least have some recourse to get it fixed right, if you spend thousands to do it wrong yourself... and then spend a few thousand more to get it fixed right, sad faces will be present.

          Best of luck to you!

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          • #6
            Re: figuring out a loop

            you might try www.heatinghelp.com. ask questions "the wall". breid...............

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            • #7
              Re: figuring out a loop

              Have you considered thermostatic radiator valves?

              Haven't used them myself but they give individual
              control over each radiator.
              ---------------
              Light is faster than sound. That's why some people seem really bright until you hear them speak.
              ---------------
              “If I had my life to live over again, I'd be a plumber.” - Albert Einstein
              ---------
              "Its a table saw.... Do you know where your fingers are?"
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              sigpic http://www.helmetstohardhats.com/

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              • #8
                Re: figuring out a loop

                Thermostatic radiator valves will only work if you have a "T" system. Otherwise, the first valve that is satisfied for heat on the loop will shut down the entire loop. I only design and build boiler systems everyday so you may want to ask an expert before putting the right #30 expansion tank...unless you plan on using glycol...then go one size bigger. Glycol expands more than water. As for the pump, Grunfos 15-58 will flow your system on speed 2, but I have little doubt that when the pump is on speed 3 you will see your 20-30 degree deltaT we look for as a standard.

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