By replacing a carbon-fouled or cracked ignitor with this genuine York component

Key Benefits for Technicians Dual Contact Logic: Integrated 1NO/1NC contacts allow for simultaneous status monitoring and circuit interlocking without extra relays

Common Questions: What causes a York 160-40 limit switch to trip frequently

System Compatibility: Engineered as a direct 61-20649-04 replacement for specific Rheem and Ruud hydronic and refrigeration units

Which HVAC models are compatible with this module

McDonnell & Miller 51-S-2 Switch 30067439-890 By replacing a carbon-fouled orThe McDonnell & Miller 51 S 2 is a heavy duty mechanical water feeder and low water cut off (LWCO) designed for low pressure steam and hot water boilers. Engineered for systems with a maximum vessel pressure of 35 psi, this unit features a snap acting SPDT switch that ensures positive electrical contact for burner control or alarm signaling. The 1" NPT connections allow for straightforward integration into existing boiler piping, providing a reliable