York S1-373-23867-001 Defrost Module R-410A Engineered for high-cycle reliability in

Engineered for high-cycle reliability in residential heating systems

This model is a direct functional equivalent for part numbers A201

Technical specifications include a frequency range of 50/60 Hz and a 600VAC insulation class

ensuring your installations meet factory performance specifications

and 491211

York S1-373-23867-001 Defrost Module R-410A Engineered for high-cycle reliability inThe 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