Taco SR502-2 2-Zone Circulator Relay with Priority, Old Part #SR502-4

Description

Overall, the Taco SR502-2 provides a compact and efficient control solution for managing 2 zones and a circulator pump in hydronic heating systems. Its priority function, diagnostic lights, compatibility with various valve types, built-in transformer, and circulator relay make it a versatile choice for small hydronic systems with zoned temperature control.

Function:

• Manages water flow to 2 zones in a hydronic heating system, enabling efficient zone-based temperature control.
• Activates and deactivates a circulator pump to maintain water circulation throughout the system when needed, optimizing performance.
• Offers a priority function, allowing one zone to take precedence over the other when activated, ensuring immediate comfort in critical areas.

Key Features:

• 2-zone capacity: Suitable for small hydronic systems with 2 distinct zones.
• Switchable priority: Prioritizes one zone for faster heating when needed.
• External diagnostic lights: Facilitate troubleshooting by indicating system status and zone operation.
• Compact design: Optimizes space utilization in control panels.
• Compatible with various valve types: Works with 2-, 3-, or 4-wire zone valves for flexibility in system design.
• Built-in circulator relay: Eliminates the need for a separate relay to control the circulator pump, simplifying wiring and installation.
• Field-replaceable transformer: Facilitates easy maintenance if needed.
• Universal thermostat compatibility: Works with a wide range of thermostats.
• Fuse-protected: Ensures electrical safety.

Applications:

• Hydronic heating systems (radiant, baseboard, fan coil)
• Closed cooling circuits (zoned air conditioning)
• Hydronic heating and cooling systems (combined heating and cooling zones)

Things to Consider:

• System compatibility: Verify compatibility with your system’s voltage, control signals, and valve types.
• Installation complexity: While DIY installation is possible, consulting a qualified professional is recommended for optimal performance and safety.
• Expansion: If you need more than 2 zones, the SR506-2(4) model offers 6 zones and expandability up to 120 zones.