Description
The ACI 106291 is a professional-grade freeze protection thermostat (freeze stat) designed to safeguard HVAC air handling units, coils, and ductwork from damaging low-temperature conditions. Featuring a 10-foot averaging capillary tube, this device continuously monitors air temperature across a wide sensing area — providing far more accurate freeze detection than single-point sensors.
Key Features
- 10-foot capillary tube for broad, averaging temperature sensing across coils and duct sections
- Manual reset (M/R) operation — requires deliberate technician intervention after a freeze event, preventing nuisance restarts
- Single-pole double-throw (SPDT) switching action for versatile control wiring in both normally open and normally closed circuits
- Designed for freeze protection of AHUs, fan coils, and ducted HVAC systems
- Compact, reliable construction suited for commercial and light industrial HVAC applications
How It Works
The freeze stat’s long capillary tube is routed across the face of a coil or through a duct. If any portion of the capillary senses a temperature at or below the setpoint, the SPDT switch trips — shutting down the air handler, closing dampers, or triggering an alarm. The manual reset feature ensures the system cannot automatically restart until a qualified technician has inspected and resolved the root cause of the freeze condition.
Typical Applications
- Air handling unit (AHU) freeze protection
- Chilled water coil and hot water coil monitoring
- Outdoor air damper freeze lockout
- Duct-mounted low-temperature safety cutout
Why Choose ACI?
Automation Components Inc. (ACI) is a trusted manufacturer of HVAC sensors and controls. The 106291 freeze stat is built to deliver dependable performance in demanding environments, helping protect valuable HVAC equipment from freeze damage and costly downtime.
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