A72AA-3C Johnson Controls Temperature Control

Overview

The Johnson Controls A72AA-3C is a two-pole heavy-duty mechanical temperature control designed for reliable temperature regulation in demanding commercial and industrial environments. It incorporates a vapor-charged remote sensing bulb element and robust snap-action contacts engineered to withstand dust, water, and extreme vibrations, making it suitable for automatic control of heavy electrical loads or specialized operating applications.

Features

• Heavy-Duty Contacts: Equipped with a double-pole, single-throw (DPST) contact block featuring two isolated sets of contacts that make or break simultaneously to handle substantial electrical current.
• Vapor-Charged Sensing Element: Utilizes a highly responsive remote bulb and capillary tube system for accurate, low-drift temperature measurement.
• Environmental Resilience: Rugged construction suited for settings exposed to dust and moisture, featuring contacts resistant to roll, pitch, and high vibration.
• Adjustable Settings: Incorporates direct adjustment screws to easily fine-tune both the operational temperature range and the differential window.

Specifications

• Temperature Control Range: 50 to 90 degrees Fahrenheit (10 to 32 degrees Celsius)
• Differential Range: 3 to 30 degrees Fahrenheit (1.7 to 17 degrees Celsius), adjustable
• Switch Action: DPST, closes on temperature rise (close high, open low)
• Capillary Length: 6 feet (1.8 meters)
• Bulb Dimensions: 11/16 inch x 6-3/4 inches
• Enclosure Rating: NEMA 1
• Input Voltage: 120/208/240 VAC single-phase

Applications

• Cooling tower fan automated control
• Operational control of motorized or solenoid-operated valves
• HVAC air-side monitoring and industrial temperature regulation
• Marine vessels, trucks, or heavy engines subject to physical shock and vibration
• Commercial refrigeration and automated heavy electrical load management