more zones wanted, no more wires

Discussion in 'Irrigation / Sprinkler Forum' started by msgale, Sep 28, 2006.

  1. msgale

    msgale New Member

    Messages:
    90
    Location:
    Ohio
    i want to add more zones/valves to my existing sprinkler system, but the wires in the underground cable bringing 24V to the various valves, are all in use.

    does anyone manufacture two valves that can be separately controlled via one wire? maybe ac vs. dc, or with diodes?

    I hate to have to re-lay another cable.
  2. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,384
    Location:
    Yakima WA
    You have to have a separate hot wire from the controller to each solonoid. The ground is a common wire and is daisy chained from valve to valve.
  3. Rancher

    Rancher Guest

    You may be able to install a ground rod at the control box and at the valve sites and use only one conductor per valve, with the other side of the solonoid attached to the local ground rod.

    Note... I have not tried this.

    Rancher
  4. Bill Arden

    Bill Arden Computer Programmer

    Messages:
    584
    Location:
    MN, USA
    Do all the valves have to be on at the same time?

    If not you could wire them using relay logic.

    For example if valve #6 needs to be on when valve #1 is on and vave #2 is off, you could use a relay on #2 to tie valve #6's common to the common wire. #6's hot wire would then tie to the #1 hot.

    Just rember to get 24V AC relays.
    AC relays are different than DC ones.

    Edit: With "dual throw" relays you could do even more arangements like have it so that when #4 is on #6 is controled by the #1 position with #1 always being off. Kinda of a A/B thing.

    So for example using a 2 pole "dual throw" relay
    Relay coil from #3 hot to common
    Center of each pole is connected to #1,#2
    4 valves can then be connected to the switched hots to the common.

    The controler would then be programed to turn on valve #3 which would change the system from running the first two valves to the second two.

    More relays and more wires and the number of valves you can run go up.
    Last edited: Oct 10, 2006
  5. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,384
    Location:
    Yakima WA
    You have to have a separate hot wire to the solonoid on each valve. Each valve is tied or linked to the same ground wire. All of the hot wires have to come from the controller, each on their own separate post. The ground wire also comes from the controller. There's no other way to do it.
  6. msgale

    msgale New Member

    Messages:
    90
    Location:
    Ohio
    Bill:I don't understand the wiring you are suggseting:

    please clarify
  7. divot

    divot New Member

    Messages:
    5
  8. Bill Arden

    Bill Arden Computer Programmer

    Messages:
    584
    Location:
    MN, USA
    The link divot provided is for a easier to install system where one toggleing relay is used. This means that the first time the zone is run "valve A" runs and the second time the zone is activated "valve B" runs.

    What I was suggesting is more complex and would dedicate a zone just to switching which valves would be run. This would prevent the system from getting out of sequence and running the wrong valve.
  9. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,384
    Location:
    Yakima WA
    Guess I'm not to old to learn about new products. The "Doubler" device appears to be an answer to adding zones without additional wiring.
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