
To turn on your underground sprinkler system, start by locating the main valve, which is usually found near the water meter or at the point where the sprinkler system connects to the house. It's a good idea to check your system's manual for specific instructions, as the location may vary.
The main valve is typically a large, round or square valve that controls the flow of water to the entire system. Make sure it's fully open to ensure proper water flow.
First, turn off the water supply to the sprinkler system by locating the shut-off valves and turning them clockwise. This will prevent any accidental water flow and make it easier to work on the system.
Next, check the pressure gauge to ensure the system is at the recommended pressure range, usually between 30 and 50 PSI. This will ensure the sprinklers are functioning properly and not wasting water due to over- or under-pressure.
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Preparation
Before you start turning on your underground sprinklers, it's essential to inspect your system for any damage caused by the winter months. You'll want to check all sprinkler heads, pipes, and valves for visible signs of damage.
In colder climates, the main control valve is typically located in a basement or crawl space. In warmer areas, it may be outside near the house's foundation, usually at ground level and featuring a quarter-turn or ball valve with a large blue rubber-coated handle.
Here are the key components you should locate before starting:
- Main control valve
- Vacuum breaker
- Control panels
- Sprinkler heads
Fill the system slowly to avoid "hammer", which can cause damage to elbows, fittings, valves, and sprinkler heads.
You Will Need
Preparation is key to a successful project, and that starts with gathering the right tools and materials.
A screwdriver is a must-have for many tasks, including fixing leaks in your irrigation system.
You'll also need a pair of pliers to grip and bend various objects.
In some cases, a sprinkler valve key may be necessary to adjust or replace valves.
A pad and pen are useful for taking notes and recording important information.
Before You Start

Before you start working on your sprinkler system, it's essential to inspect it for any visible signs of damage. This includes checking all sprinkler heads, pipes, and valves for any signs of damage caused by brutal winters.
In colder climates, the main control valve is typically located in a basement or crawl space. In warmer areas, it may be outside near the house's foundation.
The vacuum breaker is usually located on the other side of the foundation from the shut-off valve. It will have a pipe entering underneath with a valve attached, a pipe exiting the side with a valve attached, two small test ports with shut-off screws, and a bell-type cap on top.
Control panels are often found outside in a covered box or in the basement. Sprinkler heads, on the other hand, can be located anywhere in the yard, usually with caps that have small screws or hex bolt heads holding them shut.
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Here's a quick rundown of what to look for when locating the different components of your sprinkler system:
- Main control valve: typically in a basement or crawl space in colder climates, or outside near the house's foundation in warmer areas
- Vacuum breaker: on the other side of the foundation from the shut-off valve, with a distinctive pipe and valve configuration
- Control panels: usually outside in a covered box or in the basement
- Sprinkler heads: located anywhere in the yard, with caps that have small screws or hex bolt heads holding them shut
Remember to fill the system slowly to avoid "hammer", which can cause damage to the sprinkler system.
Close Main Valve
The main valve is usually located in the basement, crawl space, or along the foundation. This is where you'll find the valve attached to a pipe that enters the home at ground level.
The main valve typically has a blue handle that should be in the off position. To confirm, check that the handle is 90 degrees to the pipe.
If the shut-off valve is a gate valve, it should be turned clockwise until it won't turn anymore. This will ensure it's fully closed.
For butterfly valves, the handle should be perpendicular to the pipe. This will prevent any water from flowing into the home.
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Spring Sprinkler Setup
Spring Sprinkler Setup is a breeze if you know what to do. First, make sure you've checked the control valve, which should be partially open over the winter to prevent frozen water from damaging it.
If something did break or broke over the winter, don't panic - just shut the control valve. This will give you time to figure out what went wrong and fix it later.
You'll also need to close the screw-type shutoffs in the spring, which should be partially open to prevent water from freezing. Use a flat-blade screwdriver to twist the screws until they're perpendicular to the bleeder valve.
It's essential to follow these steps to ensure your irrigation system is working properly and efficiently.
Turning On the System
First, make sure the screw-type shutoffs are closed to prevent captured water from freezing and snapping the valve body.
Check if everything is still in good shape, and if something breaks or broke over the winter, shut the control valve.
Use a flat-blade screwdriver to twist the screws until they're perpendicular to the bleeder valve.
It's completely normal for your sprinkler heads to blow out air and sputter water for a minute or two until the water fully works its way through your system.
Run each zone for 3-5 minutes and watch the sprinkler heads to make sure everything is working properly.
Keep an eye out for damaged or broken sprinkler heads, pooling water, water coming up from under the ground, or anything else that appears out of the ordinary.
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Testing and Scheduling
First, it's essential to test your sprinkler system before setting a regular watering schedule. This is a good idea to ensure everything is functioning properly.
You should schedule your system to run for the first time during a time when you can watch it. This will give you the opportunity to make any necessary adjustments before setting the schedule to run automatically.
Scheduling your system to run at night is a great way to save water, as it's when water usage is most efficient.
Test zones individually
Test zones individually to ensure your irrigation system is working properly. This involves activating each zone one at a time to identify any issues.
Head back to the sprinkler control panel and activate the first zone. As zone valves open, sprinkler heads will start to release air and sputter. This is a normal process.
Inspect the yard and sprinkler heads while the first zone is activated. Look for wet areas, bubbling, or sprinkler heads that aren’t working properly. Write down any issues you find along with the zone number.
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Shut off the first zone and activate the next one. Repeat this process for each zone, checking for any problems as you go. It's essential to address any issues before moving on to the next zone.
Run each zone for 3-5 minutes to get a thorough test. This will give you a chance to catch any issues that might not be immediately apparent. Keep an eye out for damaged or broken sprinkler heads, pooling water, or other signs of trouble.
Set Watering Schedule
Setting your watering schedule is a crucial step in making sure your irrigation system runs smoothly. You should schedule your system to run for the first time during a time when you can watch it and make sure everything is still functioning properly.
It's a good idea to run your system at night when water usage will be most efficient.
Step-by-Step Instructions
To turn on your underground sprinklers, you need to follow some simple steps.
First, locate the main water valve that controls the irrigation system.
Open this valve slowly to allow the pipes to fill with water gradually. If you open it too quickly, you'll be subjecting the sprinkler main lines to high pressure surges, uncontrolled flow, and water hammer, which can cause them to crack or burst.
Next, check the sprinkler heads to make sure they're not clogged with debris or dirt.
Once the system is pressurized, test the sprinklers by turning them on and checking for leaks or proper coverage.
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