Programming the Rain Bird ISA 304 timer is a straightforward process that can be broken down into four main stages: setting the clock, choosing or creating a schedule, setting run durations, and activating the system.
The ISA 304 has two operating modes:
Flip the switch back to or press start. The system will run through the stations and automatically revert to scheduled mode when finished. How to Suspend Watering (Rain Delay) rain bird sprinkler timer isa 304 manual
Use the button to select the station you wish to program.
: Provides complete user customization for targeted lawn and garden care. Programming the Rain Bird ISA 304 timer is
When installing or replacing the unit, match your irrigation wires to the terminal strip located at the bottom of the timer casing. Terminal Label Wire Connection Type Common Wire (connects to one wire from every valve) 1 Power wire for Zone 1 Valve 2 Power wire for Zone 2 Valve 3 Power wire for Zone 3 Valve 4 Power wire for Zone 4 Valve MV / P Pump Start Relay or Master Valve (Optional) 24V / AC Dual lines connecting directly to the plug-in transformer 🔋 Maintenance Tips
Sometimes you need to water outside of your automated schedule—such as after applying fertilizer or testing for broken sprinkler heads. How to Run a Manual Cycle Turn the master switch to . How to Suspend Watering (Rain Delay) Use the
Unplug AC power, remove the 9V battery, wait 5 minutes, then perform a fresh factory programming sequence. 🌧️ Seasonal Maintenance Tips
Mechanical timers face unique wear-and-tear issues. Here is how to fix the most common problems with the ISA 304. The Clock Dial is Not Rotating
Verify the AM/PM setting on the "Time & Day" screen.
The battery compartment is located on the lower face of the controller or inside the front wiring cover. Remove the plastic access cover. Snap a fresh onto the terminal clips.