Instruction to Install a Solenoid on a Hunter Sprinkler System


A faulty sprinkler system can cause either over-watering on your lawn, or large patches of dried grass. One of the primary causes of this under- or over-watering is a faulty valve solenoid, and thus it is necessary to replace this component as soon as it wears out. Knowing how to complete this task can be essential in fixing your sprinkler system before it over- or under-waters your lawn. Luckily this task is neither difficult nor time intensive.

Things You'll Need

  • Flat head screwdriver
  • Wire strippers
  • Grease packed wire-nuts
  • Switch power from the old solenoid to the new solenoid. Cut one wire to the old solenoid, remove 1/2 inch of insulation from the end using the appropriate slot on the wire strippers, and twist it to the end of one of the wires on the new solenoid. Secure this connection by twisting a wire nut onto it. Repeat with the other wire.

  • Remove the old solenoid by twisting it counter-clockwise until it pulls free. If water spurts out from the valve, don't worry: that's normal.

  • Insert the new solenoid into the appropriate socket on the valve and turn it clockwise until it is firm. Solenoids usually have a plastic stop manufactured onto the bottom to prevent over-tightening.

Tips & Warnings

  • You can test the efficacy of your new solenoid by turning on the water pressure to the system, and giving the solenoid a 1/2 turn to the left. If the valve opens, it is operating correctly.
  • Never cut both solenoid wires at the same time. This can result in a short circuit, and maybe even electrocution. As long as you cut and switch only one wire at a time, there is no danger of electrocution by the wires.

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