The Holman Add-A-Station PRO lets two irrigation valves share one active field wire and the common wire while keeping separate watering schedules. It is useful when adding a valve to an existing system or working around a failed active wire where a usable active and common remain.
The transmitter connects to two station terminals at the controller and combines their control signals onto the shared active wire. The receiver at the valves separates those signals so each valve responds to its assigned station. Each valve can retain its own automatic and manual run time.
An unused controller station output is needed when adding the second valve. The transmitter installs in the controller cabinet and the receiver at the valve box. Follow the included wiring diagram for a compatible 24VAC system.
