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Draw the main line from the location where your plan to install your control valves, time (if automatically operated), and backflow preventer. Draw branch lines from the main line to each head. You can route a branch line to more than one head if you use a 3â4 inch (1.9 cm) pipe, but two should be the limit.
1 If you have a master valve, turn the solenoid on the master valve, then turn the solenoid on the zone valve. 2  If the valve opens and sprinklers turn on, your valve is working and youâll need to check the controller and field wiring. 3  If the valve did not turn on any of the sprinklers, the water to the valves is still off. If you have a master valve, turn the solenoid on the master valve, then turn the solenoid on the zone valve. 2  If the valve opens and sprinklers turn on, your valve is working and youâll need to check the controller and field wiring. 3  If the valve did not turn on any of the sprinklers, the water to the valves is still off.