Water Source Heat Pump Discharge

Discussion in 'HVAC Heating & Cooling' started by plantnerd, Oct 7, 2009.

  1. plantnerd

    plantnerd New Member

    Sep 12, 2009
    Wichita, KS

    Not sure if this is the correct forum to post, but here goes...

    We have 2 water source heat pumps that discharge into a "french drain" type of setup. Last winter, I began to notice water seeping form the ground and washouts occurring out in the yard, approximately 100' from the house. I have finally been able to dig down and locate the discharge line, a 6" pvc sewer/drain line with holes drilled in one side. This line is approximately 3' below the surface, with gravel 1' around all sides. I found one spot where roots have intruded the line, and suspect more. This line the used to be (I would guess) perfectly round, is now oval in shape.

    I had a sewer/drain company out today that didn't really want to try to auger the line, as he thought his tools would simply damage the line. The line also does not have a cleanout (that I have been able to find).

    Does anybody have thoughts as to what to do to either:

    A-open the line and keep open (whether it's annual cleaning, etc)

    B-replace line with something less permeable to tree roots

    Thanks in advance

  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    ANything with holes and water running through it is going to invite tree roots. An alternative would be to drill a well, and inject the water there below where the roots normally would grow, but that may need some environmental impact work - not sure about the rules for that.
    Interesting problem (probably not to you!)...see what others have to say.
  3. Sponsor

    Sponsor Paid Advertisement

  4. PistonDog

    PistonDog New Member

    Sep 5, 2009
    Salem, NH
    There's a new type of leachfield pipe being installed that uses 12" (slightly perforated) black pipe surrounded by a 1" green non-woven plastic mat, all covered by (something like) landscape fabric. Seems pretty impervious to roots. Might give you an idea.

    The ultimate source of all knowledge (wikipedia) describes some french drains as being lined with landscaping fabric.

    "Landscaping textiles are used to prevent migration of the drainage material as well as preventing dirt and roots from entering and clogging the drainage pipe."

    Might be worth a try.

    Whats the output (or input) of the system (gallons/day)?

  5. Bill Arden

    Bill Arden Computer Programmer

    Sep 30, 2006
    computer programmer
    MN, USA
    Sending water down a well is not allowed here in Minnesota.

    I would chock it up to bad construction and rip it up and replace with ones with more fabric.
Similar Threads: Water Source
Forum Title Date
HVAC Heating & Cooling Using springwater for heatpump source Feb 22, 2010
HVAC Heating & Cooling Need info on using a cistern for open loop water source Apr 6, 2008
HVAC Heating & Cooling Water Heater as source for Baseboard Heat Jan 31, 2007
HVAC Heating & Cooling Recommendations for new hot water boiler Aug 14, 2017
HVAC Heating & Cooling Radiant heat and domestic water on same system? Feb 13, 2017

Share This Page