How to Winterize a Sprinkler System

How to Winterize a Sprinkler System. It's important to winterize your sprinkler system to avoid any potential problems. If water is left in the pipes, it could freeze and burst, causing a leak. It is especially important to winterize your sprinkler system if you live in a colder climate. There are three ways to winterize your sprinkler system.

Manual Drain Method

Step 1

Turn off the water supply at the main valve, and open the manual drain valves.

Step 2

Open the drain on the stop and waste valve and let the rest of the water drain.

Step 3

Make sure you open the test cocks on the back flow instrument to let the water drain out.

Step 4

Close the manual valves when all the water has been drained out.

Automatic Drain Method

Step 1

Shut off the water supply and relieve the water system pressure to drain the water from the mainline.

Step 2

Open the boiler drain once the water is out of the mainline. Drain the rest of the water that is caught between the shut off valve and back flow instrument.

Step 3

Make sure you open the test cocks on the back flow instrument to let the water drain out.

Air Compressor Method

Step 1

Rent an air compressor from your local equipment rental place.

Step 2

Shut off the main water supply.

Step 3

Attach the compressor with a connector, such as a quick coupler or hose bib to the mainline.

Step 4

Make sure you open the test cocks on the back flow instrument to let the water drain out.

Step 5

Open the compressor valve slowly and gradually start the airflow into the system. Make sure the air pressure stays at 50 pounds per square inch.

Step 6

Increase the air pressure if the sprinkler heads don't pop up. Never allow the air pressure to get above 80 psi.

Step 7

Turn off the air compressor when the lines are dry.

Step 8

Leave the isolation valves open about half way, and leave the test cocks open all the way.