The ACC-1200 Master Module adds modular expandability and advanced diagnostics to Hunter's ACC commercial controller platform. Designed for irrigation professionals and property managers, this master module lets you scale a controller from 12 stations up to 42 stations while enabling two-way communication with Hunter central systems for remote monitoring, scheduling and system diagnostics. Expandable modular design: start at 12 stations and expand to 42 stations by adding Hunter output modules. Flexible scheduling: supports 6 independent programs plus 4 custom programs with up to 10 start times per program. Integrated flow monitoring and sensor inputs: dedicated flow detection and multiple sensor inputs help prevent overflow and enable precise water management. Power and outputs: compatible with 120/240 VAC supply and provides 24 VAC transformer output; includes pump/master valve outputs for common commercial setups. Weather and central system compatibility: built-in support for Solar Sync® and upgrade path to two-way Hunter central control for remote communications and automatic weather-based adjustments. Rugged commercial enclosure and intuitive backlit LCD: on-site programming, clear status indicators, and diagnostic tools simplify maintenance and troubleshooting. Ideal for commercial landscapes, parks, and large residential systems, the ACC-1200 master module simplifies upgrades, improves water conservation, and reduces downtime through clear diagnostics and real-time flow awareness. Always follow Hunter installation instructions and consult the official ACC-1200 spec sheet and user manual for complete electrical ratings, wiring diagrams, and installation guidance.