Johnson Controls A28AA-20 Temperature Control Freon The open frame coil construction

The open frame coil construction features 18-inch leads and Class F insulation

it is the direct substitute for legacy part numbers S1-2702-3181/A and S1-2702-318P/A

Replacing an imbalanced or failing HVAC blower fan is critical to preventing premature motor failure and excessive cabinet vibration

What are the signs of a failing Trane TXV

For technicians performing liquid propane burner conversions in residential or light commercial heating applications

Johnson Controls A28AA-20 Temperature Control Freon The open frame coil constructionThe 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