meaning the circuit completes only when the 24V coil is energized

refer to the specific part numbers required for those specialized burner trays to ensure compliance with emissions standards

As a critical safety and performance part

increasing the maximum operating fluid temperature to 428 degrees Fahrenheit (220°C)

featuring a 3/4 inch NPT connection and a robust brass body

McDonnell & Miller PSE-801-U-120 Low Water Cut Off Els PW 29614 meaning the circuit completes onlyMcDonnell & Miller?PSE 801 U 120 120Vac Auto Reset Low Water Cut Off for Steam Boilers with Test Switch and Extended Barrel Probe (Part Number 153828) LWCO 120V (153828)