Weathermatic SmartLine SL1600 Controller - 4-Zone Expandable Base

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The Weathermatic SmartLine SL1600 is a weather-smart irrigation controller designed for commercial and residential sites. The 4-zone base is field-expandable and combines familiar manual programming with automatic, ET-based smart scheduling. 4-zone base, expandable up to 16 zones with hot-swappable SLM expansion modules for flexible system growth. Dual operation modes: Basic mode for conventional programming and Smart mode for automatic ET adjustments using on-site weather data. Backlit LCD, four independent programs with up to eight start times per program, and seasonal/monthly watering adjustments. Advanced diagnostics: built-in valve locator, on-board multi-meter, fault review for open or shorted zones, and zone amperage/voltage readouts. SmartLink remote access ready - manage controllers from computer, tablet, or smartphone with SmartLink accessories and network. Built-in transformer with pre-installed line cord, rain/freeze sensor input, manual test runs, and non-volatile memory - no battery required. Designed for installers and property managers, the SL1600 balances precise water management with straightforward setup and maintenance. Durable indoor/outdoor housing, programmable pump/master valve outputs, and a two-year limited manufacturer warranty make it a dependable choice for saving water and simplifying system control. Consult the included installation and owner manuals for full specifications, wiring diagrams, and SmartLink setup instructions. Show more