Rainbird LXME Delay b/n station

Discussion in 'Irrigation' started by e171fish, Jul 18, 2012.

  1. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Messages: 50,758

    find out what is the precise delivery of the well - how many gpm at what pressures - make a chart, and forget what your pressure switch is set for - chart the well/pump performance to 70 psi at the tank, and maybe higher if the pressure switch will allow

    you will forget about combining zones - you will run one zone at a time, and nozzle the heads in those zones to match the well performance - this is what was done in olden days, and you can do it today, even if the balance (balance means there is no cycling) between well and zone is met at a pump output beyond 70 psi, because modern pressure tanks are rated at 100 psi or greater - sometimes, you have to replace the pressure switch with a heftier model with a higher range of cutoff pressures - it's an effort, but worth it

    but there is a shortcut

    there are a family of devices that can retrofit to a well install, upstream of a pressure tank, that takes away all the hard work involved in balancing a system to a well - one such device is named Cycle-Stop Valve - you dial up your desired output pressure (a number below the cutoff on your pressure switch) and the device maintains that outlet pressure that makes your sprinklers work, and the pump operates continuously the entire time the zone is on
  2. e171fish

    e171fish LawnSite Member
    Messages: 6

    The csv is interesting but I'm going to try balancing by adding additional spray heads to Zones 1-3 so they can run independently. The zones could actually use additional heads for better coverage.

    The remaining zones are balanced.

    Thinking about using the Hunter I-Core controller. Any thoughts?

  3. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Messages: 50,758

    If you get the entire system balanced, what problem does the existing controller present? Does continuous well operation at any output pressure whatsoever (going above 70 psi here) run the well dry?
  4. e171fish

    e171fish LawnSite Member
    Messages: 6

    The current controller only allows a 10 minute delay between stations.

    I've never ran the well dry, but after 3 plus hours of irrigation, we get the yellowish/brown water inside from what the well company believes is sediment being introduced because the well has drawn down.
  5. slava

    slava LawnSite Member
    from Russia
    Messages: 23

    AFAIK RainBird LXME has Cycle&Soack function. You can use it. It's some sort of dirty hack, but should work.
  6. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Messages: 50,758

    you are still pissing in the wind until you know what the deal is with the well's recharge rate - find out what it is

    the colored water is probably years of deposits on the walls of the well shaft, that come loose when the water level drops more than in past years - you can simply filter it out for the time being
  7. e171fish

    e171fish LawnSite Member
    Messages: 6

    The well is only 2.5 years old. Does the recharge rate test need to be done by my well installer?
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  8. Mike Leary

    Mike Leary LawnSite Fanatic
    Messages: 23,172

    We call it a "pump-down" test up north, and, yes, your installer should have provided you paperwork for demand/recharge criteria. I'd be thinking of another well guy to do a test, if you've got no info. :dizzy:
  9. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Messages: 50,758

    that test should be done when the well is drilled, but you could still do filtration - it isn't like yours is the first ever well to bring up unbeautiful water
  10. e171fish

    e171fish LawnSite Member
    Messages: 6

    Quick update... All of my zones are now balanced to prevent the well pump from cycling.

    I'm just waiting on a Hunter I-Core controller to replace the Rainbird unit so I can set longer a longer delay b/n stations to allow the well to recharge.

    Should be all set after it arrives.

    Thanks for all of the helpful information.

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