Belimo ZONE24NO-S Zone Actuator, Spring-Return, Normally Open, 24V, w/ Aux Switch

Belimo ZONE24NO-S Zone Actuator Overview

The Belimo ZONE24NO-S is a spring-return zone actuator engineered for reliable on/off control in HVAC zoning applications. Designed to operate in the normally open position, this actuator automatically returns to the open state upon loss of power — ensuring continuous airflow or fluid flow as a fail-safe default. Compatible with both 24Vac and 24Vdc control systems, it integrates seamlessly into a wide range of residential and light commercial zoning setups.

Key Features

• Spring-return mechanism provides fail-safe normally open operation
• Dual voltage compatibility: 24Vac and 24Vdc
• Built-in auxiliary switch for end-position feedback and system integration
• Compact, direct-mount design for simplified installation
• Suitable for use with zone dampers in HVAC zoning systems
• Belimo’s proven actuator technology for long service life and dependable performance

Normally Open Fail-Safe Operation

The ZONE24NO-S is configured as normally open, meaning the actuator holds the damper or valve in the open position when de-energized. This fail-safe design is ideal for applications where maintaining airflow or fluid circulation during a power interruption is critical to system safety and occupant comfort.

Auxiliary Switch

The integrated auxiliary switch provides an end-position signal that can be used to confirm actuator position, interlock with other system components, or trigger additional controls — adding a layer of intelligence and feedback to your zoning system.

Applications

• Residential and commercial HVAC zoning systems
• Variable air volume (VAV) zone control
• Hydronic zone valve control
• Building automation and energy management systems

Why Choose Belimo?

Belimo is a globally recognized leader in actuator and valve technology for HVAC applications. The ZONE series actuators are purpose-built for zoning reliability, offering consistent performance, easy installation, and long operational life — making them a trusted choice for HVAC professionals.