Setting the Maximum Backup ET ensures that your WeatherTRAK controller will provide sufficient irrigation in the event that it loses communication. Your maximum backup ET number is based off the maximum weekly ET the site may experience. The controller uses the maximum ET in combination with a monthly seasonal curve that simulates a typical annual weather pattern. The maximum backup ET number is in weekly inches. Backup ET values can be set from 0.50” to 3.99” per week in 0.10” increments. As a general reference, a maximum backup ET is typically set between 1.7” and 3.5” per week depending on the site’s climate.

1.  Press the SETUP button.

2.  Press the à button until the MAX BACKUP ET PART 1 screen displays.

3.  Press the + or – button to change the value of the number to the left of the decimal.

4.  Press the à button. The MAX BACKUP ET PART 2 screen displays.

5.  Press the + or – button to change the value of the number to the right of the decimal.