Description
Johnson Controls A19AAF-2 Utility Thermostat Overview
The Johnson Controls A19AAF-2 is a dependable line-voltage utility thermostat engineered for a wide range of commercial and industrial HVAC applications. Designed to operate on 120, 208, or 240 VAC systems, this thermostat delivers reliable temperature control across a broad sensing range, making it an ideal solution for unit heaters, fans, refrigeration equipment, and general-purpose temperature switching.
Key Features
- Wide voltage compatibility: 120/208/240 VAC for flexible installation across multiple system types
- Temperature sensing range: 30°F to 110°F, suitable for both heating and cooling applications
- 2°F fixed differential for consistent, stable switching performance
- 6-foot capillary length provides installation flexibility in tight or remote sensing locations
- SPDT (Single Pole Double Throw) switching action enables both heating and cooling control from a single device
- Automatic reset eliminates the need for manual intervention after a temperature excursion
- Screwdriver range adjuster allows secure, tamper-resistant setpoint changes
Application Highlights
The A19AAF-2 is well-suited for unit heaters, duct-mounted fans, refrigeration cases, and other equipment requiring reliable line-voltage temperature switching. Its SPDT configuration supports both normally open and normally closed circuit control, giving installers maximum wiring flexibility. The 6-foot capillary allows the sensing bulb to be positioned precisely at the point of measurement, even when the thermostat body must be mounted remotely.
Technical Specifications
- Brand: Johnson Controls
- Model / SKU: A19AAF-2
- Supply Voltage: 120/208/240 VAC
- Temperature Range: 30°F to 110°F
- Fixed Differential: 2°F
- Capillary Length: 6 ft
- Switch Configuration: SPDT
- Reset Type: Automatic
- Setpoint Adjustment: Screwdriver Range Adjuster
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