Cleveland Controls DFS-448-452 Sensing Switch R-410A It is important to note

It is important to note that this head pressure control kit is intended for use with PSC outdoor fan motors and requires the presence of a compressor crankcase heater and a non-bleed TXV for proper operation

including common model numbers like QVEF030

Proper installation requires verifying the gasket seal to prevent flue gas leakage and ensure the Ametek blower motor reaches the necessary RPMs for secondary heat exchanger throughput

and visible lubricant leakage around the bearing housing

and a pressure regulator into a compact

Cleveland Controls DFS-448-452 Sensing Switch R-410A It is important to noteThe Cleveland Controls DFS 448 452 is a fixed set point air pressure sensing switch designed for critical airflow proving in duct heaters, air handlers, and energy management systems. Engineered for technicians who need a "set and forget" solution, this differential pressure switch features a non adjustable set point of 0. 05" W. C. (+0. 025 0. 005"), ensuring precise activation when system pressures rise. Its SPDT snap acting switch allows for