Damper Actuator Spring LFZ-T0524-KF

Technical Summary

The LFZ-T0524-KF is a spring-return rotary damper actuator designed for fail-safe airflow control in commercial HVAC applications. This actuator provides reliable ON-OFF damper positioning with automatic spring return to the fail-safe position upon power loss or control signal interruption. With 44 in-lb output torque and dual auxiliary switches, it ensures dependable operation in smoke control, economizer lockout, and safety damper applications where fail-safe positioning is critical.

Technical Specifications

Application

Engineered for fail-safe damper control in air handling units (AHUs), rooftop units (RTUs), smoke evacuation systems, and outdoor air economizers. The spring-return mechanism ensures automatic damper closure (or opening, depending on installation) during power failures, fire alarm activation, or emergency shutdown sequences. Dual auxiliary switches provide positive end-position feedback to building management systems (BMS) and enable interlock logic for safety sequences and alarm monitoring.

Reliability & Performance

Industrial-grade construction with robust spring mechanism ensures consistent fail-safe operation across thousands of cycles. The 70-second stroke time provides controlled damper movement, while the rapid <20-second spring return delivers immediate response during emergency conditions. Two sets of auxiliary switches support advanced sequencing, status monitoring, and fault detection in life-safety and critical HVAC applications. Simple ON-OFF control integration reduces wiring complexity and enhances compatibility with legacy control systems.

Cross-reference: Comparable to Belimo LF24 E US