A70GA-2C Johnson Controls Temperature Control

Overview

The Johnson Controls A70GA-2C is a heavy-duty, line-voltage mechanical temperature control engineered for reliable performance in refrigeration, heating, and HVAC/R applications. It features a vapor-charged sensing element and an automatic reset function. The unit incorporates a four-wire, two-circuit contact block containing two isolated sets of contacts designed to transfer at the setpoint, causing the auxiliary contact to close simultaneously when the main contact opens.

Features

• Four-wire, two-circuit switching configuration with isolated contact sets
• Main contacts open on temperature drop (Open Low) while auxiliary contacts close
• Automatic reset operation restores function once temperature returns to the normal range
• Long-life, snap-acting contacts ensure reliable circuit control
• Remote hydraulic copper capillary bulb sensor for flexible installation
• Convenient screwdriver slot adjustment for easy setpoint selection

Specifications

• Temperature Control Range: 35°F to 80°F (1.7°C to 26.7°C)
• Temperature Differential: Adjustable from 5°F to 27°F (operational range up to 3°F to 30°F)
• Voltage Rating: 120 to 600V AC
• Contact Configuration: 1 NO / 1 NC isolated sets (DPST)
• Sensing Bulb Dimensions: 3/8 inch diameter by 3 inches length
• Capillary Length: 6 feet (72 inches)
• Enclosure Type: NEMA 1 galvanized steel housing

Applications

• Commercial refrigeration systems and walk-in coolers
• Heating equipment and line-voltage HVAC/R monitoring
• Low-limit ventilation system shutdown controls
• Building Automation System (BAS) alarm integration for freeze protection or low-temperature detection