Johnson Controls A28AA-20 Temperature Control 30067439-890 this SPST (Single Pole Single

this SPST (Single Pole Single Throw) switch operates as a normally open contact that closes when proper combustion air pressure is detected

Professionals frequently specify the B329 for AHU and fan coil units where zero leakage and accurate modulation are critical for system efficiency and balancing

Using liquid sealants may interfere with the precision fit of the blower flange and lead to future service difficulties

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 this SPST (Single Pole SingleThe 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