Description
The Johnson Controls A11A-13 is a low temperature cutout freezestat engineered to protect HVAC coils, air handlers, and hydronic systems from freeze damage. With a wide voltage compatibility range of 24 to 277Vac and a manual reset design, this freezestat ensures that once a low-temperature fault is detected, the system remains safely locked out until a technician manually inspects and resets the device — preventing repeated freeze events.
Key Features
- Wide voltage range: 24 to 277Vac for compatibility with a broad range of HVAC control circuits
- SPST (Single-Pole, Single-Throw) switching action — Open on Low temperature drop
- Manual reset operation requires technician intervention before system restart, preventing repeated freeze damage
- Cutout temperature range: 35°F to 45°F, ideal for freeze protection in air handling units and ductwork
- Fixed differential: 12°F for consistent, predictable switching performance
- 4-foot capillary length for flexible installation in tight or remote sensing locations
- 1/8″ diameter x 40-foot sensing element provides broad area coverage across large coil faces or duct cross-sections
Technical Specifications
- Voltage: 24 to 277Vac
- Switch Type: SPST
- Action: Open on Low (temperature drop)
- Reset Type: Manual
- Cutout Temperature Range: 35°F to 45°F
- Fixed Differential: 12°F
- Capillary Length: 4 feet
- Sensing Element: 1/8″ diameter x 40 feet
- Brand: Johnson Controls
- SKU: A11A-13
Application
The A11A-13 freezestat is designed for use in commercial and industrial HVAC applications where freeze protection is critical. The long 40-foot sensing element is particularly well-suited for averaging temperature across large coil surfaces, ensuring that any cold spot — not just a single point — triggers the protective cutout. This makes it an excellent choice for protecting chilled water coils, hot water coils, and air handling unit preheat sections in cold climates.
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