The HD42AQ253 is designated for CCW (Counterclockwise) rotation when viewed from the lead end/opposite shaft end

ensuring long-term reliability in high-cycle environments where temperature and humidity data logging are mission-critical

facilitating precise flame sensing and sequencing for safe combustion cycles

This HVAC control transformer is primarily utilized in Carrier commercial units

McDonnell & Miller FS8-WJ Switch R-407A The HD42AQ253 is designated forThe McDonnell & Miller FS8 WJ Flow Switch (Part Number: 120602) is a heavy duty, NEMA 4X rated flow switch engineered for high demand hydronic and industrial fluid monitoring. This liquid flow switch features a 1" BSPT connection and is built with sealed Monel bellows to ensure reliable operation in corrosive or wash down environments where standard enclosures fail. Operating at a maximum pressure of 160 PSI and temperatures up to 225F, the FS8 WJ