The Johnson Controls A72AA-2 Temperature Control is a heavy-duty, two-pole temperature switch designed for reliable refrigeration and heating operation. This DPST (Double-Pole, Single-Throw) controller features a vapor-charged sensing element that ensures precise response to thermal changes across its 15°F to 55°F (-9°C to 13°C) range. Built with a 6-foot capillary tubing and a 3/8" x 3" sensor bulb, it provides the versatility needed for remote mounting in demanding environments. The open-low switch action is ideal for maintaining specific setpoints in commercial systems, while the 120-240 Vac compatibility allows for direct control of high-amp electrical loads without always requiring a separate contactor. Designed for contractors who prioritize durability, this unit includes an automatic reset and a 3/4" conduit opening for streamlined installation. Whether managing evaporator fans or heater circuits, the A72AA-2 offers the mechanical robustness and setpoint stability required for critical HVACR infrastructure. Key Benefits Universal Voltage Compatibility: Rated for 120-240 Vac, supporting a wide range of industrial and commercial power configurations. DPST Contact Block: Features two isolated sets of heavy-duty contacts that break or make simultaneously for enhanced circuit control. Vapor-Charged Sensing: High-sensitivity element provides accurate cut-in and cut-out performance with a 3 to 30 degree adjustable differential. Rugged Construction: Equipped with a 3/4" conduit opening and a screwdriver slot range adjuster for secure, onsite calibration. Common Questions What is the primary application for the A72AA-2? It is typically used for low-limit control or operating control in refrigeration, cooling towers, and heating systems requiring a DPST switch. Can this control be used for polyphase motors? Yes, the two-pole construction allows for the control of polyphase motors where overload and single-phasing protection are separately provided. Is the capillary tube flexible? Yes, the 6-foot copper capillary is designed for routing to remote sensing points, though sharp kinks should be avoided to prevent damage to the vapor charge. 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.
