6 Zone switching relay with Priority

The Taco SR506-5 Six-Zone Switching Relay provides efficient, centralized control of hydronic heating systems with built-in priority and diagnostic capabilities.

Designed for multi-zone hydronic heating applications, the SR506-5 simplifies wiring and system control by combining multiple circulator relays into one compact enclosure. It offers a priority zone for domestic hot water (DHW) or other critical heating loads, ensuring efficient energy management and reliable operation across all zones.

• Model number SR506-5 identifies the Taco Six-Zone Switching Relay with priority control for hydronic systems utilizing up to six circulators or zone valves.
• Designed for easy installation and integration with thermostats, boilers, and zone control systems.
• Combines advanced electronic switching with visual diagnostics for simplified troubleshooting and long-term reliability.

Technical Data & Performance

• Zones: 6 Individual Heating Zones – each with dedicated relay output and thermostat connection.
• Priority Control: One Priority Zone for domestic hot water or other high-demand applications; automatic priority override for system balance.
• Power Supply: 120 VAC, 60 Hz input power.
• Relay Contact Rating: 5A @ 120 VAC (each zone).
• Fuse Protection: Built-in replaceable fuse for pump circuit protection.
• Boiler Connection: Isolated end switch for safe and direct boiler or aquastat interfacing.
• Transformer Rating: 40 VA, 24 VAC for thermostat power supply and control.
• Enclosure: Steel cabinet with hinged cover and high-visibility LED indicators for each zone.
• Indicators: LEDs display power, zone call, and pump operation status for quick diagnostics.
• Mounting: Wall-mounted enclosure with labeled terminal connections for fast and organized wiring.
• Ambient Operating Temperature: 32°F to 120°F (0°C to 49°C).
• Compatibility: Works with any 24V thermostats and hydronic circulator pumps.
• Dimensions: Approx. 11 inches (W) × 8 inches (H) × 3 inches (D).
• Certifications: UL Listed and compliant with CSA C22.2 standards.
• Warranty: 5-Year Limited Manufacturer’s Warranty from Taco Comfort Solutions.