Heat recovery unit and recirculation piping

Discussion in 'Water Heater Forum, Tanks' started by steelsparky, Mar 16, 2013.

  1. steelsparky

    steelsparky New Member

    Messages:
    3
    Location:
    FL
    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. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,352
    Location:
    New England
    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?
  3. steelsparky

    steelsparky New Member

    Messages:
    3
    Location:
    FL
    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. steelsparky

    steelsparky New Member

    Messages:
    3
    Location:
    FL
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