The Schneider Electric (Erie) 30-158-B Motor is a high-reliability

27" WC setpoint and SPDT configuration

It signifies the specific negative pressure required to close the switch and allow the ignition control to proceed

The Johnson Controls DP140005U21D is a high-precision low differential pressure transducer engineered for critical airflow monitoring in HVAC and building automation systems

and MP-4130

Trane MOD2554 Module 318172-701 The Schneider Electric (Erie) 30-158-BThe Trane MOD2554 is a mission critical Remote Test and Operating Module (RTOM) designed for seamless integration with ReliaTel microprocessor controls. Engineered for field installation in Trane and American Standard rooftop units, this OEM control module provides the necessary hardware interface for advanced diagnostic testing and system expansion. Operating on a standard 24V HVAC control circuit (60 Hz), the MOD2554 functions as a central