Taco SR506-EXP 6-Zone Switching Relay with Expandability
Taco SR506-EXP 6-Zone Switching Relay with Expandability
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📋 Procurement & Shipping Notice
- LTL Freight Dispatch: Heavy commercial units ship directly via insured LTL carrier with delivery coordination included.
- Project Timelines & Submittals: Need guaranteed delivery dates, formal submittals, or tax-exempt processing?
👉 Request a Commercial Quote or contact our procurement team for direct freight scheduling.
Corporate Procurement & PO Processing
Formal Purchase Orders (POs) and tax-exempt ordering are accepted for commercial contractors and institutional facilities.
Apply for Trade Account & Terms →| Specification Parameter | Official Factory Value |
|---|---|
| Control Capacity | 6 Control Zones with Switchable Priority Settings |
| Input Operational Supply | 120 VAC ±10%, 60 Hz, Single Phase |
| Maximum Combined Board Load | 20 Amps Continuous Capacity |
| Circulator Relay Rating | 1/3 HP (6 FLA, 36 LRA at 120 VAC) |
| Boiler End Switch Contacts | 24 VAC, Isolated Dry Contacts (1 Amp Max Rating) |
| Expansion Capabilities | Daisy-chain up to 20 Panels (Modbus / 3-Wire Network Architecture) |
| Enclosure Footprint Dimensions | 12-1/4" Width x 8.00" Height x 3.00" Depth |
| Safety Approvals | UL Approved, CSA Certified, FCC Part 15 Compliant |
The Taco SR506-EXP is a high-performance, contractor-grade 6-zone switching relay engineered to seamlessly interface conventional, programmable, or Wi-Fi thermostats with circulator pumps in commercial and large-scale hydronic multi-zone heating loops. Equipped with a premium multi-layered printed circuit board, this universal control integrates advanced multi-zone distribution pipelines into an efficient, central boiler management hub.
Advanced System Integration
Featuring specialized -EXP PowerPort control slots, the SR506-EXP expands easily up to 20 zoning panels (managing up to 120 individual zones simultaneously). Built-in smart features include selectable post-purge timers, automated pump exercise cycles to prevent offseason scaling, and dual boiler contacts designed to leverage the modular modulation profiles of modern condensing or high-efficiency boilers.
Key Commercial Operational Features
- External Diagnostic LED Arrays: Troubleshoot system operations instantly without opening the enclosure door via externally visible indicators showing active power, thermostat connection status, and individual zone call indicators.
- Intelligent Priority Protection: Prevents freeze-ups by automatically resetting system functions if an indirect domestic hot water tank demands priority heating continuously for more than 60 minutes.
- Contractor-Friendly Main Board Architecture: Spacious box casing features deep rear knockouts, a removable hinged enclosure cover, and highly isolated terminal connections to streamline rapid field swap-outs.
Looking for exact electrical blueprints or system staging submittals? Click here to request the official factory engineering documentation sheets.
Product Documents
