The Trane CNT05482 (21C140501G55) is a Defrost Control Board designed to manage the defrost cycle in heat pump systems. This electronic control ensures that the outdoor coil defrosts at the right time, preventing efficiency loss and ice buildup. It plays a crucial role in maintaining consistent system performance during colder months and is a direct replacement part for many Trane and American Standard units. Key Features Controls the defrost cycle to ensure optimal system efficiency Automatic and timed defrost initiation Reliable temperature and compressor monitoring Genuine OEM replacement part for Trane systems Built for durability in residential and light commercial applications Specifications Model Number: CNT05482 Part Number: 21C140501G55 Type: Defrost Control Board Voltage: 24 VAC control circuit Function: Defrost cycle timing and control Compatible With: Trane Heat Pump Systems Compatible Models 4TWR4060E1000BA 4A6H5036G1000CA 4TWX5049E1000BB 4A6H5030E1000AB 4TWR4030D1000AA 4A6B4048E1000AA 4A6H4042D1000AA 4TWX6060E1000AA 4TWR5061E1000BA 4A6H3048B1000AA Why Choose This Item Choose the Trane CNT05482 Defrost Control Board for efficient, automated defrost operation that protects your heat pump from ice buildup while maintaining performance in cold climates. It?s a reliable OEM solution, ensuring proper fit and function in a wide range of Trane models. Perfect for maintenance or system repair professionals who value dependable and original components.