ACI 145358 FreezeStat with 20 ft Capillary, Auto-Reset, 2-Circuit

The ACI 145358 FreezeStat is a professional-grade freeze protection thermostat engineered for commercial and industrial HVAC applications where coil and air handler freeze damage must be prevented. Featuring a 20-foot averaging capillary sensing element, this control monitors air or fluid temperatures across a wide area, ensuring accurate detection of dangerously low temperatures anywhere along the sensing tube — not just at a single point.

Key Features

• 20-foot capillary sensing element for broad-area temperature averaging
• Auto-reset (A/R) operation — automatically resets once safe temperatures are restored
• Dual 2-circuit switching for versatile control of multiple loads or sequences
• Designed for freeze protection in air handling units, duct systems, and coil applications
• Reliable low-temperature detection to protect equipment from freeze damage
• Compact, field-installable design suitable for commercial HVAC environments

How It Works

The 20-foot capillary tube is routed across the face of a cooling or heating coil, or through a duct section. If any 12-inch segment of the capillary senses a temperature at or below the setpoint, the control activates — shutting down fans, opening valves, or triggering alarms as wired. The auto-reset function restores normal operation automatically once temperatures recover, reducing the need for manual intervention.

Ideal Applications

• Air handling units (AHUs) with chilled water or DX coils
• Makeup air units in cold climates
• Duct-mounted freeze protection in commercial buildings
• Hydronic heating and cooling systems requiring low-limit protection

Why Choose the ACI 145358

ACI (Automation Components Inc) is a trusted name in building automation and HVAC sensing. The 145358 FreezeStat is built for dependable, long-term performance in demanding environments, helping protect valuable HVAC equipment and prevent costly freeze-related failures.