tieing in before the pressure switch

Discussion in 'Irrigation' started by AI Inc, Jul 15, 2010.

  1. AI Inc

    AI Inc LawnSite Fanatic
    Posts: 25,164

    Looked at a tough one the other night.Split level, as usual , the water source was under the landing. Front steps s foot wider then landing. Finished basement to the righ of landing.Copper feed going to the tank and switch cross the garage. Real easy place to do the tap. I asked a well guy and he said If I move the check valve to before my tie in I would be fine. Otherwise the switch would not know when to turn the pump on. Anyone ever do it?
     
  2. Some Sprinkler Guy

    Some Sprinkler Guy LawnSite Member
    Posts: 167

    I have not done it but have heard it will make the pressure switch work incorrectly.

    Seems to me when a zone kicked on or off it will make the switch read errantly.

    Let us know what happens.
     
  3. Mdirrigation

    Mdirrigation LawnSite Silver Member
    Posts: 2,472

    Well guy is correct , add another shut off for the main if one is not there .
     
  4. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,490

    The only thing at all hinky about such a setup is that there will be some 'reverse' flow in the segment of pipe between the tank and your tie-in.
     
  5. Mdirrigation

    Mdirrigation LawnSite Silver Member
    Posts: 2,472

    To stop any reverse flow , put a swing check upstream of the sprinkler supply line .
     
  6. Some Sprinkler Guy

    Some Sprinkler Guy LawnSite Member
    Posts: 167

    As soon as the system comes on the pressure drops to 0 then the pump kicks on? By having two check valves you are running the well without a pressure tank. Maybee I am missing something here.

    To the OP, be sure to let us know how this goes.
     
  7. AI Inc

    AI Inc LawnSite Fanatic
    Posts: 25,164

    The more I think about it, the more I want to tap after and just plumb back to the garage and out.
     
  8. AI Inc

    AI Inc LawnSite Fanatic
    Posts: 25,164

    would that not fool the PS to thinking that there was no demand?
     
  9. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,490

    No check valves between POC and pressure tank in this arrangement. You live with the reverse flow.
     
  10. Sprinkus

    Sprinkus LawnSite Silver Member
    Posts: 2,048

    Could possibly cause the pressure switch to chatter.
    If I were to tap in like that I would move the original check valve and then add one on the sprinkler supply.
    I'd say go for it. Worst case scenario is that it won't work or maybe cause some serious water hammer.
     

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