This post is based on our original pdf about winterizing irrigation systems.
Winter Shutdown Procedure
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Close the main supply/shutoff valve (marked in blue.)
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Open all 1/4″ ball valves on the backflow preventer.
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Turn ball valves on the backflow preventer to a 45 degree (or less) angle.
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Open all drains in the main line and in the valves boxes (marked in green).
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Open all bleed screws on the valves or turn all solenoids to the “ON” position.
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Turn clock to the “off” position.
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Cover the backflow preventer with a backflow blanket.
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Check the hose bib to be sure you did not turn off the house water supply!
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Your house main is marked in red.