Programming Hardie RD-900 for Split-Day Watering Windows

Goal: Two Watering Windows on Same Day

San Antonio restrictions: 3:00–8:00 AM and 8:00–10:00 PM. Need stations 1,3,4,5,6 in AM window; 2,7,8,9 in PM window.

Solution: Use Program A and Program B

The RD-900 (Rain Dial) uses three independent programs (A, B, C). Assign each window to a separate program.

Step-by-Step Programming

1. Program A (AM): Switch to A. Set station run times: 1,3,4,5,6 = desired minutes; 2,7,8,9 = OFF. Set Start Time 1 = 3:00 AM; Start Times 2 & 3 = OFF. Set skip days (e.g., every 2nd day). Set days to water.
2. Program B (PM): Switch to B. Set station run times: 2,7,8,9 = desired minutes; 1,3,4,5,6 = OFF. Set Start Time 1 = 8:00 PM; Start Times 2 & 3 = OFF. Same skip days and water days as A.
3. Program C: Verify all stations OFF.
4. Return dial to Current Time, bottom switch to Run.

Key Insight

Each program runs independently. Both A and B will execute on their scheduled days. Stagger start times so Program A finishes before Program B starts.