Johnson Controls A28AA-20 Temperature Control Refrigerant Replacing the heat exchanger gasket

Replacing the heat exchanger gasket during routine teardowns prevents costly site visits and preserves the hydraulic integrity of the HVAC hydronic system

the 1-5/8 inch copper tee represents the industry standard for durability and dimensional accuracy in complex piping layouts

The actuator should be mounted above the valve body when installed in horizontal piping

Can this thermostat be used for cooling applications

maintaining the factory finish of your existing pneumatic control system

Johnson Controls A28AA-20 Temperature Control Refrigerant Replacing the heat exchanger gasketThe Johnson Controls A28AA 20 is a heavy duty two stage temperature control designed for multi stage heating or cooling applications in commercial refrigeration and HVAC systems. Featuring dual SPDT switches, this controller allows for independent sequencing of equipment loads, making it ideal for managing staged compressor banks or ventilation systems. The unit operates across a wide voltage range, including 120 208 240 277 Vac, ensuring