Weathermatic SmartLine SLM4 4-Zone Expansion Module

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The Weathermatic SmartLine SLM4 is a 4-zone expansion module that increases the station capacity of compatible SmartLine controllers. Engineered for quick, reliable expansion, the SLM4 lets installers and contractors add four additional stations per module without disrupting existing schedules. Adds four additional stations to SL1600 SmartLine controllers, expanding capacity in 4-station increments. Hot-swappable slide-in design installs without powering down the controller or reprogramming programs. Indoor/outdoor rated housing and commercial-grade connectors for long-term field durability. Direct module-to-controller connection aligns with SmartLine channels for fast, tool-free installation and secure seating. Works with SmartLine system features — ET watering adjustments and SmartLink network access when paired with SLW on-site sensors. Installers should insert modules in sequential module positions as indicated in the SL1600 manual. Product documentation, installation guides, and spec sheets are available to help with wiring, module sequencing, and system planning. For larger systems, multiple SLM4 modules can be combined up to the controller’s maximum station capacity; consult the SL1600 technical specification for exact limits. Show more