Description
The Taco SR503 3-Zone Switching Relay with Priority is an electrical control part designed to manage multiple heating zones in HVAC systems. It directs the operation of zone valves or circulator pumps, ensuring that heat is delivered to the appropriate areas based on thermostat demand. The built-in priority function allows one zone to receive heating first while other zones remain inactive until the prioritized zone reaches its setpoint. In hydronic heating systems to coordinate the sequence of valves and pumps, serving as the central control that organizes zone activation and maintains balanced temperature distribution throughout the system.
