How do I connect the rain sensor to my 27894 timer?
Connect the rain sensor wires to the yellow-colored wiring terminal ports labeled 'Sensor' on the timer. Refer to your rain sensor's manual for specific wiring instructions. Place the sensor on/off switch to the 'on' position to begin operation. Important: if the rain sensor switch is on but no sensor is connected, the sprinkler timer will not operate.
From the official Orbit 27894 Sprinkler Timer manual, page 11
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