OpenSprinkler Forums OpenSprinkler Unified Firmware Activating main valve alone? Reply To: Activating main valve alone?



You can do so by using a spare zone (you don’t need zone expander, you can simply enable more zones in Edit Options -> Station Handling, OpenSprinkler allows you to set more logical zones than the number of physical zones you may have). The spare zone can serve as a ‘dummy’ zone to activate master.