Wiring Your Controller (Generation 2)

Not sure how to wire your controller? No sweat!

The Generation 2 Rachio Smart Sprinkler Controller is designed to accommodate two sensors, a master valve or pump relay, and up to 16 zones. If you're having trouble reading the terminal labels, please reference the wiring guide below:

C Common (use any or all)
# (1-16) Zone # (reference old timer wiring)
M Master Valve or Pump Relay; see Advanced Wiring
S1 Sensor 1 (Rain or Flow)
S2 Sensor 2 (Rain or Flow)
SC Sensor Common
SP Sensor Power (Wireless Rain Sensor)


Tips for Wiring:

  • 24VAC and ground wires are not needed.
  • An enclosure is required for hard wiring installations and/or outdoor installation.
  • When inserting or releasing wires, push IN on terminal block with a small screwdriver (see below). This will ensure a solid connection.


  • Solid 18 gauge single-strand copper wiring is ideal. If you have thicker gauge wires we recommend retrofitting with 18 gauge wires using a terminal strip.


Looking for more help? Check out this video! 

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