The Hunter DUAL-S is an external surge suppression module designed for use with the I‑Core DUAL two‑wire decoder system. It protects the two‑wire path from transient voltage events and is intended for in‑field installation in valve boxes as part of a complete DUAL decoder installation. Designed for I‑Core DUAL systems: Provides dedicated surge protection for two‑wire decoder paths that use DUAL-1 and DUAL-2 decoders. Recommended spacing: Install earth‑grounded DUAL‑S arresters at a minimum of every 12 decoders or every 1000' (300 m) of two‑wire path; increase frequency in high‑lightning areas and always place one at the end of each two‑wire path. Valve‑box mounting: Install the DUAL‑S inside a valve box; leave approximately 5' (1.5 m) of extra wire and splice at the midpoint of the slack loop for a secure connection. Two‑wire protection: Arrests transient surges on the two‑wire path to reduce risk of decoder or controller damage and improve long‑term reliability. Waterproof connections: Use the supplied waterproof connectors for reliable two‑wire splices in buried valve boxes. Simple integration: Plugs into DUAL systems without requiring decoder reprogramming and works alongside DUAL48M output modules for system diagnostics. Installers should follow Hunter's installation guide and local electrical grounding codes when adding DUAL‑S modules. Proper placement—at least one DUAL‑S per 12 decoders or per 1000' of path and one at each path end—helps protect installations from lightning and transient events while keeping two‑wire systems serviceable and reliable.
