Just what are all those pipes and controls used for?
In most cases, sprinkler systems are supplied by the water main, where water comes into a home. The fire sprinkler system connects to the water main. In some systems the water flows through a backflow valve. A main water control valve is on the pipe that supplies the sprinkler system. This control valve turns the water flow on and off. Your system may have additional or different features.
Turning off the water to your home will also turn off the water to your fire sprinkler system.
Contact your sprinkler contractor if you have questions.