Johnson Controls A28AA-20 Temperature Control 30067439-890 Designed for the Williams 5507

Designed for the Williams 5507 Series and 6007 Series

Check for corroded electrical connections or loose spade terminals before assuming the contactor itself has failed

What media is compatible with the RLGP-G switch

Can I use this for Propane (LP) gas systems

Energy Efficiency: Designed specifically as an energy conservation control to minimize temperature variations and reduce equipment runtime

Johnson Controls A28AA-20 Temperature Control 30067439-890 Designed for the Williams 5507The 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