Automation Components Inc (ACI) FS-2 Freeze Stat

The Automation Components Inc (ACI) FS-2 Freeze Stat is a high-performance low temperature limit control designed to prevent costly damage to HVAC heating and cooling coils. This mechanical freeze protection device features a 20-foot vapor-filled capillary sensing element that triggers a protective response if any one-foot section of the tube detects temperatures below the user-defined setpoint. Engineered for reliability, the FS-2 model includes two SPDT relay outputs, allowing for simultaneous system shutdown and local alarm notification. This duct-mounted thermostat is essential for applications prone to air stratification or outdoor air infiltration. As a manual reset freeze stat, it ensures that technicians can a fully investigate the cause of a low-temperature trip before the system is re-engaged, providing an extra layer of safety for critical equipment. The rugged NEMA 1 HVAC safety switch enclosure is built for long-term service in commercial and industrial air handling units.

Key Benefits:

• Comprehensive Sensing: The 20-foot copper capillary responds to the lowest temperature sensed along any 12-inch segment for precise protection.
• Dual Control Logic: Equipped with two SPDT contacts (Form 1C) to manage both equipment power and building management system (BMS) alerts.
• Field Adjustable: Features a simplified adjustable setpoint range from 14°F to 54°F to suit specific environmental requirements.
• Manual Safety Lock: The manual reset button prevents automatic equipment restarts, ensuring a safe inspection after a freezing event.
• Durable Construction: Heavy-duty NEMA 1 metal housing with standard 1/2-inch conduit knockouts for easy electrical installation.

Common Questions:

What happens if only a small part of the capillary gets cold?
The ACI FS-2 is designed to actuate if any single foot of the 20-foot element reaches the setpoint temperature, ensuring protection even if most of the coil remains warm.

Where should the FS-2 be mounted for best results?
For optimal freeze protection, the sensing element should be installed in a serpentine pattern across the downstream side of the heating coil or the upstream side of the cooling coil.

Can I adjust the sensitivity or differential?
The trip point is adjustable via a slotted screw on top of the unit, while the switching differential is fixed at approximately 1.8°F to ensure consistent performance.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.

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