If you own a Rain Bird ISA 304 sprinkler timer, you possess one of the most reliable workhorses in residential irrigation history. Known for its rugged simplicity and intuitive electro-mechanical design, the ISA 304 has kept lawns green and water bills low for decades. However, without the proper guidance, programming this device can feel like deciphering an ancient puzzle.
Indoor wall plug-in (corded) with a 24VAC transformer.
You can choose "Specific Days" (e.g., Mon, Wed, Fri) or "Interval" (e.g., every 3 days). rain bird sprinkler timer isa 304 manual
: Turn the dial to Rain/Off to stop all automatic watering during wet weather without losing your program.
: Increase or decrease all station run times in 10% increments (from 10% to 200%) to adjust for seasonal changes without full reprogramming. If you own a Rain Bird ISA 304
Since the ISA 304 is a legacy model, the original paper manual may be missing. You can download a free PDF by:
The Rain Bird ISA-304 is a 4-station indoor sprinkler timer designed for user-friendly home irrigation management. It features a large LCD display and an intuitive programming dial with buttons to manage up to four watering zones. Key Features and Specifications Indoor wall plug-in (corded) with a 24VAC transformer
Adjust the run time (1 minute to 2 hours). Repeat for all four stations. Rain Bird ISA 300 / 400 Series Sprinkler Timer Manual