The Johnson Controls A72AA-22 Temperature Control is a heavy-duty, two-pole DPST temperature switch designed for direct control of high-amperage electrical loads in commercial refrigeration and industrial heating systems. As an automatic reset temperature control, it effectively manages 120-240 Vac circuits, including polyphase motors, without the need for additional magnetic starters where single-phase protection is already in place. This model features a wide 25°F to 90°F range and an adjustable differential (typically 3°F to 30°F), allowing technicians to fine-tune cut-in and cutout points for precise environmental regulation. Built with a durable vapor-charged sensing element and a 6-foot copper capillary, the A72AA-22 ensures reliable performance in demanding field conditions. The dual-contact design allows for the simultaneous breaking of both "hot" lines in single-phase circuits or the independent control of two separate circuits. Professionals favor the A72 series temperature controls for their rugged NEMA 1 enclosure and intuitive 3/4-inch conduit opening, which streamlines integration into existing HVACR control systems including cooling towers and walk-in coolers. Key Benefits Universal Application: Engineered for both cooling and heating cycles with an "Open Low" (close on rise) switch action ideal for head pressure control. High Load Capacity: Rated for heavy electrical loads, supporting up to 24.0 Full Load Amps at 120/208/240V for motor-driven equipment. Field Adjustability: Calibrated scales permit rapid adjustment of set points without removing the cover, saving time during system commissioning. Mechanical Durability: Incorporates a stainless steel element cup and snap-acting contacts to prevent vibration-induced chatter in high-usage environments. Common Questions What is the difference between the A72AA-22 and other A72 models? The A72AA-22 specifically provides an open-low action with a 25/90°F range. Unlike manual reset or weather-resistant variants, this unit features automatic reset and a NEMA 1 rated enclosure for indoor installations. Can I use this control for 3-phase motors? This Johnson Controls thermostat can control polyphase motors directly provided they have internal overload protection and do not exceed the specific amperage limits defined on the cover label. How do I adjust the temperature differential? Adjustments are made via the internal differential screw. Clockwise rotations widen the differential by changing the cut-in point only, while the cutout remains tethered to the main range setting. 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.
