McDonnell & Miller 159S Controller R-410A coils must be sourced separately

coils must be sourced separately if needed

ensuring reliable signal transmission between the thermostat and the high-voltage blower motor or inducer

It features a CCW (counter-clockwise) rotation as viewed from the shaft end

"pressure switch stuck open" error codes on the control board

6 Cv for linear flow characteristics and stable room temperature control

McDonnell & Miller 159S Controller R-410A coils must be sourced separatelyThe McDonnell & Miller 159S Controller (Part Number 178802) is a specialized combination low water cut off and pump controller designed for heavy duty commercial and industrial steam boiler applications. Operating at a maximum pressure of 150 psi, this unit integrates a float operated mechanism with dual bi metal snap acting switches to ensure precise level management. The configuration features one SPST switch dedicated to pump control and a second