Description
The ACI 105904 is a professional-grade freeze protection thermostat (freeze stat) engineered for use in HVAC air handling units, duct systems, and other applications where coil or equipment freeze protection is critical. With a generous 20-foot capillary tube, this control can be serpentined across an entire coil face or duct cross-section to sense the lowest temperature at any point along its length — providing true averaging protection against freeze conditions.
Key Features
- 20-foot capillary tube for wide-area freeze detection across coils and duct sections
- Auto Reset (A/R) operation — automatically restores normal operation once temperatures rise above the setpoint
- Dual SPDT (Single Pole Double Throw) contacts for versatile switching — supports both normally open and normally closed circuit configurations
- Capillary averaging design detects the coldest point along the entire tube length, not just a single spot
- Suitable for use in air handling units, fan coil units, and ductwork freeze protection applications
- Compact, rugged construction built for reliable long-term performance in demanding HVAC environments
Application
Freeze stats are a critical safety component in HVAC systems. When air temperatures drop dangerously low — such as during economizer operation, damper failure, or cold-weather startup — the freeze stat trips the system to prevent coil freeze-up and costly equipment damage. The ACI 105904’s 20-foot capillary allows thorough coverage of large coil faces, while the auto reset feature minimizes service interruptions once safe temperatures are restored. The dual SPDT contact arrangement provides wiring flexibility for shutting down fans, closing dampers, or triggering alarms simultaneously.
Product Specifications
- SKU: 105904
- Brand: ACI (Automation Components Inc)
- Type: Freeze Stat / Freeze Protection Thermostat
- Capillary Length: 20 feet
- Reset Type: Auto Reset (A/R)
- Contact Configuration: 2 SPDT (Single Pole Double Throw)
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