Rain Bird Sprinkler Timer Isa 304 Manual May 2026

Rain Bird ISA 304 is a 4-station indoor sprinkler timer featuring a large LCD display, a manual programming dial, and various preset watering schedules Initial Setup

Run 18-gauge underground-approved wire from the timer to each valve. Connect one wire to each station terminal and one to the common terminal. rain bird sprinkler timer isa 304 manual

  1. Rain Bird’s Official Archive: Go to RainBird.com > Support > Literature & Manuals. Search "ISA 304."
  2. ManualSlib: A free library of vintage irrigation manuals. Search "Rain Bird ISA Series Instruction Manual."
  3. Internet Archive (Archive.org): Search "Rain Bird ISA 304." User-scanned copies are often available.
  4. Ebay Listings: Some sellers include a CD-ROM or photocopy of the manual with used timers.

Programming the Rain Bird ISA 304

Because the ISA 304 exists in both mechanical dial and early digital versions, follow the instructions that match your unit. Rain Bird ISA 304 is a 4-station indoor

Power & Wiring: Connect the 24-volt transformer to a standard 120 VAC/60 Hz outlet. Run 18-gauge underground-approved wire from the timer to your valves (one common wire plus one wire per station). Rain Bird’s Official Archive: Go to RainBird

Use the Advance button to cycle between day, hour, and minutes.

Step 3: Set Watering Start Times

You have 2 start times per day. Both will run all zones sequentially.