Jumping a limit switch is only recommended for brief diagnostic testing by a qualified technician

ensuring the integrity of the secondary pressure system

debris-free air supply to the burner

Using this contactor with a 240V control circuit will cause immediate coil failure

How do I size this valve for a boiler replacement

Weil McLain 511-624-643 Sensor Assembly Els PW 17895 Jumping a limit switch isThe Weil McLain 511 624 643 Pressure Sensor Assembly is a critical OEM replacement component designed for high performance hydronic systems. This burner pressure sensor kit includes the transducer and junction box, providing the precise feedback necessary for modulating boiler control and combustion safety. Unlike standard switches, this assembly integrates a no siphon sensor design to deliver accurate static and dynamic pressure differential readings