Zurn Weathermatic SLDEC4 Four-Valve SmartWire Decoder Module - SLDEC4
The Weathermatic SLDEC4 is a four-valve SmartWire decoder module designed for SmartLine controllers (SL1600 family and SL9600TW). It converts controller signals over a two‑wire path to operate up to four irrigation valves at each decoder location, simplifying wiring and reducing installation costs.
Includes downloadable wiring diagrams and the owner’s manual. Confirm compatibility with your SmartLine controller and use SLWIRE/SLCONN splice kits for buried installations. Warranty: SmartWire products carry awhen used with SLWIRE/SLCONN connectors (2 years otherwise).
Features
- Four-valve decoder compatible with SmartWire SLDEC series and programmable via the decoder module.
- Operates on 24–28 VAC from the 2‑wire path; protected against shock and surge.
- Sealed electrical components, 14‑gauge PVC‑coated leads, and freeze/heat rating −20° to 60°C.
- Effective valve control up to 100' (30 m) from the decoder; reports failed solenoids and diagnostic status.
- Auto shut-down if communication is lost; designed for indoor/outdoor valve box installation.
- Ideal for commercial sites and large residential installs where reducing trenching and wire costs matters.
What our Experts Think
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Controls up to 4 valves per unit: Reduces the number of decoders needed per valve box, simplifying large-scale installations.
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SmartWire 2-wire efficiency: Transmits power and communication over a single 2-wire path, significantly cutting trenching and copper wire costs.
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Seamless SmartLine integration: Designed to work with Weathermatic SmartLine Controller SL9600TW family for centralized, programmable irrigation management.
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Built-in diagnostics: Reports solenoid faults and communication errors directly to the controller for faster troubleshooting.
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Rugged, field-ready design: Sealed electronics with surge protection and freeze/heat resistance for long-term outdoor reliability.
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Flexible installation layouts: Supports loop, star, and branch wiring configurations for complex landscape projects.
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Reduced maintenance downtime: Modular architecture allows faster fault isolation and system expansion without major rewiring.
Q&A
Q: What is the Zurn Weathermatic SLDEC4 used for?
A: A 4-valve SmartWire decoder module that converts two-wire controller signals into individual valve operations for efficient irrigation system control.
Q: What systems is it compatible with?
A: Designed for Weathermatic SmartLine® SL9600TW and SL1600-series controllers using the SmartWire® 2-wire system.
Q: How many valves can it control?
A: Up to four irrigation valves from a single decoder location, reducing trenching and wire requirements.
Q: How does it work?
A: It receives encoded signals over a 2-wire path and activates only the programmed valve address, while all other decoders ignore the command.
Q: What are its key features?
A: Shock- and surge-resistant sealed electronics, programmable valve addressing, and built-in diagnostics for fault detection and solenoid monitoring.
Q: Where can it be installed?
A: In valve boxes for indoor or outdoor irrigation systems, typically in commercial or large residential landscapes.
Maintenance Tips
- Inspect periodically for secure wiring connections and signs of corrosion or moisture intrusion.
- Ensure valve wire splices and field connections remain sealed and waterproof for reliable communication.
- Check for proper zone activation and response during scheduled irrigation cycles.
- Verify decoder is receiving stable signal from the controller and replace or troubleshoot if zones fail to trigger.
- Keep valve boxes clean and dry to prevent sediment, insects, or water damage to electronics.
- After electrical work or lightning events, test all zones to confirm full operational integrity.
- Replace damaged units using compatible Zurn Weathermatic components to maintain system reliability.
Damage 
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