Caleffi Z121000 Motorized Zone Valve Actuator

The Caleffi Z121000 Motorized Zone Valve Actuator is a 24V AC, 2-position actuator with spring-return operation, designed for precise valve control in hydronic systems, including open or closed loop configurations. It delivers dependable valve positioning for reliable zone heating and cooling, with an integrated microswitch providing feedback for control safety and coordination with your boiler or circulator.

Key specs ensure durable, code-compliant performance: 50/60 Hz operation, 0.4 A current draw, and a 5 W power rating. Features include a 1/2 inch supply connection, 18 inch lead wires, and a compact 4 inch width. The rugged body combines polycarbonate base/cover with an aluminum plate for long service life in mechanical rooms or crawlspaces. Operating temperature ranges from 32 to 104 °F. It carries UL 873, CUL, and CE approvals for added confidence. Designed for simple retrofit into existing hydronic loops, it supports standard 1/2 inch valve connections and a straightforward wiring setup. Note that an auxiliary microswitch is not included.

• Voltage: 24 V AC
• Type: 2-position with spring return
• Limit switch: Microswitch (NC)
• Connections: 1/2" supply; 18" wire
• Construction: 4" width; polycarbonate base/cover, aluminum plate
• Power: 5 W; current 0.4 A; frequency 50/60 Hz
• Operating temp: 32–104 °F
• Approvals: UL 873, CUL, CE