Lead-free brass construction for potable water and hydronic heating systems

How do I test this limit switch during a service call

The Eaton C25DNF340B provides the same electrical ratings

Engineered as a direct OEM replacement for 48J0101

Armstrong Furnace R46257-001 Defrost Board Els PW 17895 Lead-free brass construction for potableThe Armstrong Furnace R46257 001 Defrost Board is a critical replacement control module engineered for heat pump systems requiring precise defrost cycle termination and initiation. This OEM control board manages the reversing valve and outdoor fan motor operations during low ambient conditions to prevent evaporator icing and maintain system COPs. Designed for seamless integration with Armstrong and Air Ease heat pumps, the R46257 001 features