Sprinkler Timer Programming Explained: A Comprehensive Guide

Sprinkler Timer Terminology

  • Sprinkler Timer, Clock or Controller
  • Program
  • Date and Time
  • Start Time
  • Run Time
  • Days, Watering Days or Days of The Week
  • Rain Delay or Delay Watering
  • Seasonal Adjust, Percent Adjust or %
  • Auto Run
  • Off
  • Zone, Station or Hydrozone
  • Rotor, Spray, Drip, Bubbler and Rotator
  • Test Stations
  • Rain Sensor
  • Manual Station or Manual Program
Sprinkler System Timer Programming Dial

Sprinkler Timer, Clock or Controller

These terms are used interchangeably to describe the brain of your sprinkler system. The sprinkler timer controls when and for how long your system operates.

Program

Programs (usually labeled A, B, C, D, etc.) add versatility to your system. They allow you to:

  1. Run multiple stations simultaneously (if water supply allows)
  2. Set different watering schedules for new sod or seed
  3. Create seasonal programs for gardens or vegetables
  4. Water different areas at various times of day

Date and Time

Accurate date and time settings are crucial for proper sprinkler programming. Incorrect settings can lead to unexpected watering times, potentially disrupting outdoor activities.

Start Times

Start times determine when your sprinkler program begins. You must set at least one start time per program for proper operation. Typical start times are between 10 pm and 4 am.

Run Times

Run time is the duration each station or zone operates. Example run times for different sprinkler types:

  • Spray Heads: 22 Minutes
  • Part Circle Rotors: 40 Minutes
  • Full Circle Rotors: 60 Minutes
  • Bubblers: 8 Minutes
  • Drip Garden: 15 Minutes
  • Rotary Nozzles: 55 Minutes

These times are typical for every-other-day watering in mid-summer with temperatures around 90°F (32°C).

Watering Days

Watering days specify when your system runs. Options include specific days of the week, even/odd days, or cyclical schedules. Most residential systems use a weekly schedule.

Rain Delay

Rain Delay pauses your system for a set period (usually 1-30 days). After the delay, regular irrigation resumes automatically.

Seasonal Adjust

This feature allows easy optimization of your system throughout the season. Adjusting the percentage changes all run times proportionally. For example, setting 50% will halve all run times.

Auto and Off Settings

Auto: The operational setting for your system. The dial must be set to Auto for programmed watering to occur.

Off: Stops all watering. Use this setting for extended downtime, such as during winter.

Additional Features

  • Zone/Station/Hydrozone: A section of sprinklers controlled by one valve.
  • Test Stations: Allows system inspection and observation after programming.
  • Rain Sensor: Shuts down the system when it detects sufficient rainfall.
  • Manual Controls: Allows running individual stations or entire programs as needed.