Mcguyver would be stumped!!

Discussion in 'Irrigation' started by Eddywill, May 23, 2007.

  1. Eddywill

    Eddywill LawnSite Member
    Posts: 31

    I have a very strange situation here and I hope someone can shed some light on it. I have a 4 zone system that draws water from a river behind my house. Zone 2 is giving me fits. It will come on run for a few minutes then lose pressure and shut down. I have replaced the valve and same problem. I have changed the wiring from another zone same problem. Here is where it gets strange when I run zone 2 with another zone (manual) zone 2 works like a charm. I do not want to end up doubling up zones so I want to figure this out. Now when zone to starts I have one sprinkle that spits air for a second or two then takes off. There are not wet areas or anything strange that I can find. I have read a few areas about airlocks but I am not sure that is my issue. I would love to hear any guesses as this has me stumped big time! Thanks Eddy
     
  2. Midlo Snow Maker

    Midlo Snow Maker LawnSite Member
    Posts: 183

    what type of valve is it
     
  3. Eddywill

    Eddywill LawnSite Member
    Posts: 31

    Rainbird CP-100 I left the body and replaced the diaphragm and top half.
     
  4. Dirty Water

    Dirty Water LawnSite Fanatic
    Posts: 6,794

    Its not the zone.

    Its your pump.

    Zone2 isn't using all of the water your pump can provide, so the pressure rises until the pressure switch at the pump kicks the pump off.

    Then the pressure has to bleed down to the low end cut on point before it kicks on again.

    What size pump do you have? How many heads are on Zone 2 and what are their nozzles? What type too.
     
  5. Eddywill

    Eddywill LawnSite Member
    Posts: 31

    Jon the pump never shuts off - its a flowtec 2hp. There are 3 heads and a pop up it is indeed the least "tapped" zone but the pump does not shut off!
     
  6. Dirty Water

    Dirty Water LawnSite Fanatic
    Posts: 6,794

    Is it set up with a pressure switch or a pump start relay?
     
  7. Eddywill

    Eddywill LawnSite Member
    Posts: 31

    Pump start relay
     
  8. Midlo Snow Maker

    Midlo Snow Maker LawnSite Member
    Posts: 183

    sounds like a porting problem to me. the initial burst from solenoid opens it up but some restriction in the porting process could be back building the pressure causing it top shut down?:dizzy:
     
  9. Eddywill

    Eddywill LawnSite Member
    Posts: 31

    Any way to temp test it? remove the end sprinkler?
     
  10. or nozzles
     

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