Neptronic AC2-B Auxiliary Switch Freon or the diagnostic LED on

or the diagnostic LED on the control board flashing a "Pressure Switch Stuck Open" or "Closed" error code

featuring a compact frame size specifically engineered for tight clearances often found in Copeland housing

Utilizing this diagnostic tool ensures your commercial or residential boilers operate at peak efficiency

this OEM-spec component maintains system static pressure balance and operational efficiency

the unit features 1/8"-27 NPT pilot taps on both the left and right sides

Neptronic AC2-B Auxiliary Switch Freon or the diagnostic LED onThe Neptronic AC2 B is a high performance auxiliary switch designed for seamless integration with Neptronic BT, BTM, and BTX series actuators. Built to handle double pole, double throw (DPDT) configurations, this unit provides precise remote status feedback and control for HVAC dampers and valve actuators. As the engineered replacement for the BT180 and compatible with BT160 footprints, it secures reliable end switch signaling within building