Johnson Controls A72AE-1 Temperature Control

The Johnson Controls A72AE-1 Temperature Control is a heavy-duty DPST (Double-Pole, Single-Throw) switch designed for high-demand HVACR applications. This wide-range temperature control features a 25°F to 90°F range with an adjustable differential of 4°F to 25°F, allowing technicians to fine-tune system cycles for optimal efficiency. Engineered for durability, the A72AE-1 includes a neoprene-coated 6-foot capillary and sensing bulb, providing superior protection against moisture and corrosion in outdoor or wash-down environments. The open-low switch action makes it an industry standard for managing cooling tower fans, motorized valves, and evaporative condensers. With a robust weather-resistant enclosure and dual-pole contact unit, this controller handles polyphase motors and heavy electrical loads without the immediate need for supplemental magnetic starters. The internal screwdriver slot adjustment and visible calibrated scale ensure precise setpoint management during routine maintenance or system commissioning.

• Environmental Protection: Features a weather-resistant NEMA 3R style enclosure and neoprene-coated sensing bulb for reliable performance in harsh conditions.
• High Electrical Capacity: The heavy-duty DPST contacts support 240V operations, making it suitable for direct control of cooling tower fans and large solenoid valves.
• Precise System Control: Adjustable temperature differential minimizes short-cycling, extending the lifespan of refrigeration and cooling components.
• Versatile Mounting: Dual mounting feet and a 3/4-inch conduit opening facilitate clean, professional installation on flat surfaces or brackets.

• What is the primary application for the A72AE-1? It is most commonly used as an operating control for cooling towers to maintain head pressure by cycling fans or controlling water flow based on ambient or process temperature.
• Can this control be used for single-phase or three-phase motors? Yes, the two-pole contact unit can break both sides of a single-phase line or be integrated into three-phase control circuits, provided the load does not exceed the AC full-load amp ratings.
• How do you adjust the settings? Remove the gasketed access plugs to use the internal screwdriver slots; screw 'A' adjusts the cut-in/cut-out range simultaneously, while screw 'B' modifies the differential.

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