Johnson Controls A70GA-1 Temperature Control

The Johnson Controls A70GA-1 is a robust single pole single throw (SPST) temperature control designed for heavy-duty refrigeration and heating applications. Engineered with an open low action, this controller maintains precision across a 15°F to 55°F temperature range, making it ideal for walk-in coolers and specialized HVACR systems. The 20-foot capillary length allows for flexible sensor placement in large cabinets or remote locations, ensuring accurate bulb-sensing temperature feedback. Operating on 120-240 Vac, it features an automatic reset mechanism and a reverse acting auxiliary contact, providing reliable circuit control for fans or alarms. The 1/2-inch conduit opening and NEMA 1 enclosure simplify field wiring for service technicians. This Johnson Controls A70 series switch is a staple for contractors requiring a durable HVAC temperature controller that handles inductive loads without frequent contact fatigue or drift in calibration.

Technical Benefits

• Extended Capillary Reach: The 20-foot lead provides versatility for remote sensing in complex ductwork or refrigeration racks.
• Versatile Voltage Compatibility: Multi-tap support for 120-240 Vac power inputs allows for universal field replacement.
• Integrated Auxiliary Contact: The reverse acting contact enables simultaneous control of secondary components like signal lights or high-limit alarms.
• Field-Proven Durability: Built with a heavy-duty bellows system to withstand high-cycle industrial environments.
• Automatic Reset Logic: Ensures immediate resumption of system operations once the temperature climbs above the set differential.

Common Questions

What is the primary application for an Open Low temperature control?
This configuration is typically utilized for cooling applications where the circuit must break on a temperature drop to prevent freeze-ups or over-cooling, automatically closing when the temperature rises.

Can the A70GA-1 be mounted in any orientation?
Yes, the A70GA-1 can be mounted in any position; however, avoid sharp bends or kinking in the 20-foot capillary to maintain accurate pressure transmission to the bellows.

Is this control suitable for hazardous environments?
The standard model features a NEMA 1 enclosure intended for general-purpose indoor use. For washdown or explosive environments, a different enclosure rating would be required.

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.