How do I install a rain sensor? (Generation 1)

  • Quick Overview
  • Wire it Up
  • Enable in App

  • Quick Overview

    For more detail, see article: Rain Sensors FAQ

    In most installations, a rain sensor acts as a switch; as moisture absorbing disks expand, they activate a switch that interrupts the circuit from the controller to the solenoid valves. Once the rain sensor has dried out, the switch deactivates to allow for normal operation.

    The Rachio 1st Generation Smart Sprinkler Controller is compatible with any wired or wireless normally closed (NC) rain sensor, which activates after rainfall (when the moisture-absorbing disks expand).

    NOTE: The Rachio 2nd Generation Smart Sprinkler Controller is also compatible with any wired or wireless normally closed (NC) rain sensor. For Gen 2 wiring instructions , please refer to this support article .
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    Wire it Up

    Prior to installing the Rain Sensor, take a few moments to read through these instructions in their entirety. The rain sensor must connect ONLY to the following terminals on your Rachio Gen 1 device:

    • rain sensor ( R1 , R2 ) terminals - for basic wired sensors
    • common ( C ) terminal - for wireless (powered) sensors

    Do NOT connect the rain sensor to any of the zones.

    Installation methods must comply with all applicable national and local electrical codes. If you are unsure about proper wiring practices, have a qualified contractor perform the installation for you.

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    How To : Connect Rain Sensor Wiring

    Disconnect power to the controller.
    Route the Rain Sensor connection wire into the controller through the access hole in the base or bottom of the wall mount
    Locate your controller's sensor terminals (yellow) and attach the Rain Sensor control wires directly to these terminals (in either order) -- see diagrams .
    Enable the rain sensor in the Rachio App > Device Settings
    Reconnect power to the Rachio
    NOTE: Avoid routing the wire over any sharp edges where damage to the wire insulation may occur. For best results, hide the wire as much as possible by tucking it under shingles and/or moldings. Seal any holes made by passing the wire through structure walls.
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    Rain Sensor Wiring Diagrams | Generation 1

    Are you replacing a Hunter SRC controller that has a rain sensor? Please read these wiring notes
    Wired Rain Sensor (basic non-powered)

    To connect a wired rain sensor to your Rachio 1st Generation controller, please see the wiring diagram below:

    Wireless Rain Sensor (powered transponder)

    To connect a wireless rain sensor to your Rachio 1st Generation controller, you can find model-specific diagrams in the links, below:

    Compatible Rain Sensors (Click name for Specs & Instructions)
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    Enable in App

    To activate the rain sensor in the Rachio app, please follow the steps below:
    From the dashboard screen, tap on Device Settings
    Tap Advanced
    Enable Rain Sensor Toggle

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    Check if it Works

    To test the Rain Sensor operation, please review: How to test a rain sensor

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