ISA 300 / 400 Sprinkler Timer - Installation, Programming, and Operation Guide

Oct 22, 2026

Rain Bird ISA 300/400 Series electronic sprinkler timers for controlling when irrigation starts and how long it runs. The guide explains simple programming and flexible watering schedules suitable for diverse landscape needs, with support for multiple stations, pre-set schedules, independent programs (ISA 400 models), multiple start times, and a Rain-Off feature that suspends watering while preserving settings. It covers planning and mounting, wiring and power setup, current time/day programming, schedule selection and editing, manual operation, system testing, winterization, and troubleshooting.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages45

Reading Time1 h 53 min

AccessFree to download

Introduction

ISA Timer Features and Benefits

Timer Stations

ISA Timer Controls and Indicators

Install Timer

Select Location

Mount Timer

Install Battery

Connect Field Wiring

Select Proper Wire

Connect Valve Wires to Timer

If Using a Master Valve or Pump Start Relay

Connect Transformer

Program Timer

Set Current Time and Day

Select a Program

Pre-Set Watering Schedules

Select a Pre-Set Schedule

Modify a Pre-Set Schedule

Set Schedule Watering Days or Watering Interval

Set Schedule Start Time(s)

Set Station Watering Duration (Run Times)

View Pre-Set Schedule Information

Operating the Timer

Turn the Timer On and Off

Run a System Test

Manually Run a Program or Single Station

Adjust Watering Percentage

Winterizing the System

Troubleshooting

ISA 300 / 400 SPRINKLER TIMER Installation, Programming, and Operation Guide RAIN BIRD IRRIGATION CORPORATION Technical Services: 800-247-3782 • [http://www.rainbird.com](http://www.rainbird.com) Special Upgrade O er Save an extra 15% o new sprinkler timers and irrigation controllers at the Rain Bird Online Store.* Still struggling with your old sprinkler timer? Having a hard time complying with local watering restrictions? Upgrading to a new Rain Bird sprinkler timer is easier than you might think. New timers are easier to program than ever before, with powerful features to help save you time and water while keeping your yard healthy and vibrant. There are lots of models to meet your needs, including indoor and outdoor versions, exible modular timers and even smart controllers that automatically adjust themselves based on the weather. Shop Now at [store.rainbird.com](store.rainbird.com) and enjoy exclusive upgrade savings! Enter discount code: UPGRADE15 at checkout to save an extra 15% o * * Additional discount not valid on clearance items, bundles or store specials. Discount applies to controller products only. Cannot be combined with other store discount codes. Valid at the Rain Bird Online Store only. Subject to change without notice. ® Registered trademark of Rain Bird Corporation. CONTENTS INTRODUCTION .............................. 1 ISA Timer Features and Benefits ............. 1 Timer Stations ......................................... 2 ISA Timer Controls and Indicators .......... 3 INSTALL TIMER ............................... 4 Select Location ....................................... 4 Mount Timer ............................................ 5 Install Battery ........................................... 5 Connect Field Wiring ............................... 7 Select Proper Wire ............................ 7 Connect Valve Wires to Timer .......... 7 If Using a Master Valve or Pump Start Relay ........................................ 9 Connect Transformer ............................ 11 PROGRAM TIMER .......................... 13 Set Current Time and Day ..................... 14 Select a Program .................................. 15 Pre-Set Watering Schedules ................. 16 Select a Pre-Set Schedule .................... 17 Modify a Pre-Set Schedule ................... 19 Set Schedule Watering Days or Watering Interval ......................... 19 Set Schedule Start Time(s) .......................... 21 Set Station Watering Duration (Run Times) ........................................... 23 View Pre-Set Schedule Information ....... 24 OPERATING THE TIMER ................ 26 Turn the Timer On and Off ..................... 26 Run a System Test ................................ 27 Manually Run a Program or Single Station ........................................ 29 Run Program(s) Manually .............. 29 Run Station(s) Manually ................. 30 Adjust Watering Percentage ................. 32 WINTERIZING THE SYSTEM .......... 33 TROUBLESHOOTING ..................... 34 INTRODUCTION Thank you for purchasing a Rain Bird ISA 300 / 400 Series Sprinkler Timer. ISA timers provide simple programming and flexible watering schedules to meet almost any landscape’s needs. These timerscan be used with any 110 VAC / 60 Hz electrical outlet (240 VAC / 50 Hz for the international version) . This manual describes how to install, program, and operate your timer. Read this manual carefully and keep it in a handy place for future reference. If you have any problems with your ISA Sprinkler Timer, please call the Rain Bird Technical Assistance hotline at 800-247-3782 before returning your timer for service. You may also be able to find information to help solve your problem on the Rain [Bird web site: www.rainbird.com](Bird web site: www.rainbird.com). ISA Timer Features and Benefits The ISA Sprinkler Timer is an electronic clock

FAQs

What does the Rain Bird ISA 300/400 sprinkler timer control?

It controls when the sprinkler system turns on and how long the sprinklers run using programmed schedules.

What advanced features are included in the ISA timers?

The guide lists a large LCD with easy programming, six pre-set watering schedules, independent programs on ISA 400 models, up to three start times per program, multiple-station control depending on model, and a Rain-Off feature to suspend watering while keeping settings.

What does the installation section cover before programming?

It covers selecting a location, mounting the timer, installing the battery, connecting field wiring, choosing proper wire, wiring valve connections, setting up master valve or pump start relay if used, and connecting the transformer.

Oct 22, 2026

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