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Thread: Heat recovery unit and recirculation piping

  1. #1
    DIY Junior Member steelsparky's Avatar
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    Default Heat recovery unit and recirculation piping

    While I may not be a plumber, I have been called a freon plumber. I do refrigeration and A/C and just got a deal on a heat recovery unit which uses the discharge line to heat water.

    While I can easily figure out the A/C side of it, I am curious about the water side piping involving the tank. I also plan to add an active recirculation loop from the furthest fixture. And add pump @ tank.

    Question is can someone tell me the correct way to pipe this configuration? Can't seem to find any diagrams on the internet and the HRU I got did not come with any directions. Have a 40gal tank with in, out, and drain port.

    Also can anyone recommend a good grundfos recirc pump? House is on a well.

    Thanks
    Tom

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    Exactly which unit did you buy? Sounds like this is using the a/c line to preheat some water. Is there nothing on the manufactuer's website that contains this info?
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    DIY Junior Member steelsparky's Avatar
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    I'll have to get an exact model serial but it's a Trevor Martin. And yes it preheats the water. The hru says to tee off cold water supply at the tank and then pipe return into the drain. So I guess my next question is where do I pipe the return for the recirculation loop? Also in the drain?

  4. #4
    DIY Junior Member steelsparky's Avatar
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    Ok here is a piping diagram for the HRU. http://www.hotspotenergy.com/heat-re...thout%20TT.pdf

    Where do I pipe the recirculation loop back to tank, tee into drain line also? Use check valves? Thank you

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