Rain sensor not connected at control panel

Discussion in 'Irrigation / Sprinkler Forum' started by stevemariap, May 7, 2020.

  1. stevemariap

    stevemariap New Member

    Joined:
    May 7, 2020
    Location:
    dallas texas
    Hi, I have a rainbird esp 12-lx. The problem im have is trying to find out where the rain sensor is connected at. Cause its not connected at the controller main board. those connectors are jumped per the manual ( for no rain sensor ). Also the mv or (main valve) has nothing connected to it. Really the only connections are two common and 1 thru 10 for the zones. Plus the power source of course. Do you have an idea where the rain sensor is connected. Its an old hunter mini click its connected to one wire coming up out of the ground on the outside of the house pretty much in the same location as the control panel on the inside of the same wall. Thanks for your time.
     
  2. WorthFlorida

    WorthFlorida The wife is still training me.

    Joined:
    Oct 28, 2009
    Occupation:
    Retired
    Location:
    Orlando, Florida
    If it is an old sensor it could be bad, They are relatively cheap and simple and some will last years, others a year or two. The basic rain sensor is a NO and NC switch. Most are set for normally closed and when the leather washers inside the unit get wet they expand and open the circuit. Your control also has a bypass switch. After connecting it and the controller is active, not necessarily running a program, if you push on the plastic pin on top of the sensor, you can open the circuit and the controller will respond. To check the controller itself, remove the sensor strap and check the controller. It will not run. The display may read error.

    See page 57;
    https://www.rainbird.com/sites/default/files/media/documents/2018-02/man_ESPLX.pdf
     
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  4. stevemariap

    stevemariap New Member

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    Location:
    dallas texas
     
  5. hj

    hj Moderator & Master Plumber Staff Member

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    Plumber
    Location:
    Cave Creek, Arizona
    If your system does not have a "main valve" or a pump, then nothing WOULD be connected to that teminal. The rain jumper would be removed and the sensor connected to those terminals.
     
  6. stevemariap

    stevemariap New Member

    Joined:
    May 7, 2020
    Location:
    dallas texas
    Hi, Thanks for the advice. Not sure about the pump. But currently and since Iv lived here about 10 years, the sprinklers have always worked and the way its currently wired with nothing wired to the rain sensor connectors or the main valve. If there is a pump i sure would like to find it. I know where all the valves are in the yard though.
     

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  7. stevemariap

    stevemariap New Member

    Joined:
    May 7, 2020
    Location:
    dallas texas
    With that pic in mind. There is a rain sensor connected to the system some where. There is one wire coming out of the ground that is spliced to the wire come from the rain sensor near the roof.
     
  8. HudsonDIY

    HudsonDIY Member

    Joined:
    Jun 19, 2019
    Location:
    Hudson, Florida USA
    The wire coming from the ground is likely the common ground going to the valve manifold. They are just using the sensor as a switch to break the ground to the valves. The timer would still operate normally but when the rain sensor is wet it will break the circuit and the valves won't open. The timer "thinks" its watering your yard but in reality the valves don't open.
     
  9. WorthFlorida

    WorthFlorida The wife is still training me.

    Joined:
    Oct 28, 2009
    Occupation:
    Retired
    Location:
    Orlando, Florida
    At one time, very old controllers, there were no rain sensor connection inside the controller. Or there was one on a previous unit and the rain sensor circuit went bad. As HudsonNY stated, the common was wired in series to the rain sensor to the normally closed contacts. When wet it would open the common side (usually white wire) so no valves would operate.

    Get a new rain sensor. You can get wireless unit but still need to install the sensor anywhere on your property and the received is wired to the controller. You'll need to run the common wire to the controller.
     
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