York S1-373-23867-001 Defrost Module R-410A A: This kit is specifically

A: This kit is specifically designed for use with Belimo AF and NF series actuators

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

A419 and A421 electronic controls

and essential mounting hardware to streamline field installation

York S1-373-23867-001 Defrost Module R-410A A: This kit is specificallyThe 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