Sprinkler/ Irrigation System Winterization Guidelines

1. Shut off main valve (indoors)

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Figure 1. Main valve in Shut-off position.

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1a. Manually drain the system, by opening a hose bib or drain on the backflow preventer. (I do not have this in my system.)

2. Close 1st valve at backflow (outside but nearest to your house)

Figure 2a. 1^st Backflow Valve in “OPEN”position

Figure 2b. 1^st Backflow Valve in “CLOSE” position
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3. Unscrew 1st Test cock after 1st backflow valve.

Figure 3. Location of Test cock after the 1^st backflow valve.

4. Connect the fitting (where the test cock was removed).

Figure 4a. Fitting for the air compressor inserted.

Figure 4b. Compressor connected to the backflow.

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5. Turn the compressor on, and set air pressure to 80 psi.

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6. Open sprinkler valves one at a time to purge the system. Do this several times on each valve (and respective zone) to make sure water is blown out of the system.

Figure 6a. Locate the valve (currently in close position).

Figure 6b. Manually open the valve to start purging each zone.
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7. Turn off air pressure.

8. Replace test cock (figure 3). Open 1st backflow valve (figure 2a).

9. Unscrew upstream inlet (indoors). Drain inside house to let water out.

Figure 9a. Location of the Main Valve upstream inlet screw.


Figure 9b. Unscrew for draining.

Figure 9c. Wrap a towel on the opening so water will drain down the pail.

10. Turn backflow valves to 45 degrees.

Figure 10. Position of backflow valves when done draining.

11. Screw back upstream drain (figure 9a).

GOOD LUCK!!!