My pressure regulator FEBCO 825Y is currently leaking out the discharge area. I have turned off the inlet valve until repairs can be made.
In the meantime, will I be causing harm if the automatic spriklek system starts its cycle, and there is no water in the system? Will I burn-out the solenoid valve?
Nope, it won't hurt the valves at all or burn anything up. You can, like Wetboots said, just shut the system off at the controller. But either way is fine.