York S1-373-23867-001 Defrost Module R-410A This is a pilot duty

This is a pilot duty safety switch designed for 24V control circuits

A419 and A421 electronic controls

preventing premature corrosion and ensuring long-term seat integrity

System Configuration: Allows for rapid offline and online programming

York S1-373-23867-001 Defrost Module R-410A This is a pilot dutyThe York S1 373 23867 001 Yorkguard 1 Stage Defrost Module is a critical OEM replacement component designed for 1 stage heat pump systems to prevent ice accumulation on the outdoor coil. Featuring the Yorkguard demand defrost logic, this module monitors thermodynamic conditions to initiate a defrost cycle only when necessary, rather than on a set timer, maximizing HVAC energy efficiency. As a veteran technician knows, maintaining the integrity of the