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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
Secure the timer to an indoor wall near a 120-volt AC outlet, ensuring it is protected from moisture and freezing temperatures.
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.
Plug the transformer into the timer first, then into the wall outlet. Set Current Time & Day: Turn the dial to Time & Day
(right arrow) button to select the setting (Day, Hour, or Minutes). arrow keys to adjust the values. Ensure the indicator is correct. Turn the dial back to Programming the Watering Schedule You can choose a preset schedule or create a custom one. Option A: Use a Preset Schedule Set the dial to Pre-set Schedules and use the arrow keys to choose a program (1–5). www.weekand.com Rain Bird ISA 300 / 400 Series Sprinkler Timer Manual
Rain Bird ISA 304 is a 4-station, single-program indoor sprinkler timer. For complete operating details, you can refer to the official ISA 300 / 400 Series Manual Programming Your Timer Set Time and Day : Turn the dial to Time & Day
button to select the day, hour, or minutes (indicated by flashing), and use the arrows to adjust them. Return the dial to Select a Watering Schedule : Turn the dial to Pre-set Schedules
. The default is "C" (Custom). Use arrow keys to cycle through preset options (e.g., Schedule 1 waters daily at 8 AM for 10 minutes). Customize Days (Schedule C) : Turn the dial to Custom Schedule – Days button to move through days and the arrows to toggle them "ON" or "OFF". Set Start Times : Turn the dial to Custom Schedule – Starts
to select Start Time 1, 2, or 3. Use arrows to set the time in 15-minute increments. Set Duration : Turn the dial to Custom Schedule – Duration . Use arrows to pick a station, press , and then use arrows to set the run time from 1 minute to 2 hours Key Features & Controls
: Turning the dial to this position suspends all watering while retaining your programmed settings. Manual Start : To start an unscheduled cycle, press the Water Budgeting
: You can increase or decrease watering times globally in 10% increments to account for seasonal changes.
: This feature steps through all stations in two-minute increments to help you check sprinkler heads. Backup Battery
: A 9-volt alkaline battery (not included) preserves your program for up to six hours during power outages. Installation Basics : The unit is for indoor use only and should be mounted near a 120V AC outlet. rain bird sprinkler timer isa 304 manual
: Use 18-gauge direct-burial wire for runs under 800 feet. Connect one wire to each valve and one "common" wire to all valves. details (1 through 5) or troubleshooting steps for your unit? Rain Bird ISA 300 / 400 Series Sprinkler Timer Manual
Before programming schedules, ensure the internal clock is accurate: : Turn the dial to TIME & DAY arrows to set the hour (check for AM/PM) and minutes. : Press the button (right arrow) to make the day flash, then use the arrows to select the current day. : Turn the dial back to 2. Using Pre-Set Schedules
The ISA 304 comes with five pre-programmed schedules for quick setup: : Rotate to PRE-SET SCHEDULES arrows to choose a program (1–5): : Daily at 8 AM (10 mins/station). : Daily at 6 AM, 10 AM, and 2 PM (5 mins/station). : Every other day at 6 AM (10 mins/station). : Every third day at 6 AM (10 mins/station). : Every fourth day at 6 AM (15 mins/station). : Turn the dial to 3. Custom Programming To create your own schedule instead of using a pre-set: Start Times : Turn the dial to CUSTOM SCHEDULE — STARTS
. Use arrows to set up to three different times the system will begin watering. : Turn the dial to CUSTOM SCHEDULE — DURATION
. Select a station (1–4) and use the arrows to set how many minutes it should run. Watering Days
: Toggle specific days on or off by advancing through the week with the right arrow and using the arrows to select 4. Manual Operation
: To start a cycle immediately without waiting for the timer, turn the dial to and press the Skip/Advance : While watering, press the button to move to the next station. cdn.prod.website-files.com 5. Troubleshooting & Maintenance
Rain Bird Support: ISA 300 & ISA 400 Series Sprinkler Timers
The Rain Bird ISA 304 is a 4-station indoor sprinkler timer designed for simple, automated residential irrigation. Detailed instructions for its installation and programming are outlined below. Getting Started: Setup & Installation
Mounting: Screw two #10 screws into the wall roughly 4¾ inches (120 mm) apart, leaving a small gap (1/8" to 1/4") for the timer's keyhole slots to slide over.
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).
Battery Backup: Install a standard 9-volt battery to preserve your settings for up to six hours during power outages. Programming Instructions Rain Bird ISA 304 is a 4-station indoor
Follow these steps to configure your watering schedule using the central dial and interface buttons (Manual On, Advance, and Arrow keys): Set Time & Day: Turn the dial to Time & Day.
Use the Advance button to cycle between day, hour, and minutes.
Use the Up/Down arrow buttons to adjust the values, then turn the dial to Auto/Run to save. Select a Schedule: Turn the dial to Pre-set Schedules.
Choose from five built-in programs (e.g., daily at 8 AM) or select C for a "Custom" schedule. Customize Your Program:
Water Days: Turn the dial to Custom Schedule – Days to toggle specific days on or off.
Start Times: Turn the dial to Custom Schedule – Starts to set up to three start times per day.
Duration: Turn the dial to Custom Schedule – Duration to set each station's run time from 1 minute up to 2 hours.
Finish: Turn the dial to Auto/Run to activate the programmed schedule. Manual & Special Features
Manual Watering: Press the Manual On button while in Auto/Run mode to immediately start a cycle without affecting your saved settings.
Rain/Off: Turn the dial to Rain/Off to stop all automatic watering during wet weather without losing your program.
Water Budgeting: Adjust total watering times in 10% increments to easily adapt to seasonal changes.
For further assistance, you can view the official Rain Bird ISA 300/400 Series Manual on the Rain Bird Support site. Rain Bird ISA 300 / 400 Series Sprinkler Timer Manual Number of Zones: 4 (Expandable
The Rain Bird ISA 304 is a 4-station, single-program indoor automatic sprinkler timer designed for simple residential irrigation management. While discontinued by the manufacturer, it remains a common legacy device valued for its straightforward rotary dial interface. ⚙️ Technical Specifications Capacity: Controls up to 4 watering zones (stations).
Power: Indoor wall plug-in (corded) with a 24VAC transformer.
Backup: Compatible with a 9V battery to retain time and program settings during power outages.
Mounting: Requires two #10 screws spaced 4¾" (120 mm) apart. 📅 Programming Instructions 1. Set Current Time and Day Turn the dial to Time & Day; the display will flash.
Press Advance (right arrow) until the day flashes; use Up/Down arrows to select the correct day.
Press Advance again to set the hour (ensure AM/PM is correct) and then the minutes using the arrow keys. Return the dial to Auto/Run to save. 2. Choose a Schedule (Preset or Custom)
The ISA 304 offers six preset schedules (1-6) and one "Custom" (C) option.
Presets (1–6): Select 1–6 on the dial to choose from varied daily, odd/even, or specific day intervals.
Custom (C): Turn the dial to Pre-set Schedules, select "C," then turn to Custom Schedule – Days to set specific active days. 3. Set Watering Duration
Set station duration by turning the dial to Custom Schedule – Duration.
Utilize arrow keys to select a station (1–4), then Advance to adjust run time from 1 minute up to 2 hours. Rain Bird ISA 300 / 400 Series Sprinkler Timer Manual
Note: The Rain Bird ISA series (often labeled as “ISA 304” or “ISA-304”) is an older, legacy electromechanical or basic digital controller. If you are looking for a modern equivalent, this model has been discontinued for many years. This article serves as a historical reference and functional guide based on original documentation.
| Problem | Likely Cause | Solution | | :--- | :--- | :--- | | Display is blank | Power outage or dead internal battery | Check circuit breaker. Replace 9V backup battery. If still blank after AC power restored, controller is dead. | | No water to one zone | Faulty valve, wiring, or ISA 304 triac | Swap the suspect zone wire with a working zone on the timer. If problem moves to new zone → timer is bad. | | Watering starts at wrong time | AM/PM mis-set or power interruption lost time | Reset clock and start times. Replace backup battery. | | Zones won't turn off | Stuck solenoid valve OR controller stuck ON | Turn dial to OFF. If water stops → controller faulty. If water continues → valve problem. | | Fuses blow frequently | Short in valve wiring | Locate buried wire splice. Check resistance across valve wires (should be 20-60 ohms). |
