Suddenly, your lawn’s richer. And so are you.

Wiring:  Turn your timer off before making the following connections: Use a two-wire, 18 gauge, insulated irrigation cable to connect the two WM wires to the two-timer terminals, as shown below. The polarity is not important.
If a conduit is not used, the adaptor cap must be plugged back on to the adapter after running the cable through the ¼” hole and connecting the two wires using wire nuts provided.
If your timer has senor terminals, connect the wires from the WM directly to them and adjust the timer’s sensor activation switch for sensor activation.
If not, connect the two WM wires between the timer common terminal and the valve common terminal, and connect them to one of the WM wires using a wire nut.
The other WM wire is to be connected where the valve common wire(s) were connected. If your WM has an override switch, use the right position for activating the WM sensors.
The “OFF” position of the dial setting will override the WM sensors but freeze protection will be maintained. Adjust your timer zone wiring sequence so that the zone that sprinkles closest to the WM sensor is the last zone of your timer cycle. The influence of sprinkler spray will therefore be minimized.

Tip:  It is always a good idea to Operational Test.
The ambient temperature must be above 40 degrees F to conduct the following tests.

Turn the WM dial to the “OFF” position, and the override switch (if provided) to the right position.
Turn your timer on and set it for manual operation of a zone that is visible to you.
The sprinkler should come on unless it is raining or the temperature is near freezing. Assuming that you are able to water, turn the dial clockwise just until irrigation stops. Then turn the dial counterclockwise until irrigation starts again.
A slight click will be heard as the WM threshold point is passed. The click will occur at a higher level on the WM dial as the ambient relative humidity increases.
Program your timer as you normally do, but it is suggested that you cycle your watering times to avoid run off.
If your timer has a “Water Percent Adjust” feature, you are advised to apply it so that 100% of your program watering is allowed only during your peak demand month.
The WM performs most efficiently when evening watering schedules are applied.

Dial Settings:  Two dial settings for 70 major cities in the US are provided by clicking here. Use the higher setting for early morning watering (dawn) and the lower setting for evening watering, (dusk) up to midnight. If your city or town is not listed, use the settings for the closest location listed and adjust as needed. Your greenery may initially appear stressed as the root systems reach deeper for moisture but this will quickly change to a greener appearance as the roots become stronger and over watering is eliminated. Allow 5-8 hours for you VM to track the weather. Turning the dial slightly counterclockwise will decrease the number of interruptions while a clockwise adjustment will increase the number of interruptions. The WM sensitivity is fully adjustable for all climates similar to your home thermostat so adjust rather than override its function to obtain the comfort zone of your greenery. The WM will keep interrupting irrigation until the evaporation rate begins to increase.

Seasonal Dial Settings:  During the early spring, fall and winter seasons, ambient temperatures are most likely to cause the WM to interrupt irrigation. You may want to change the timer start times to evening watering when the temperature is usually higher.
Program your timer for start times just at dusk is highly recommended because it allows you to use the lower dial setting given and your WM will give you year-round
automatic weather controlled irrigation and save the most water. See this site for periodic updates.