The HONEYWELL RM7890B2014/U is an automatic primary control unit designed for 120V applications in HVAC systems. This model features advanced control technology for efficient temperature management and energy savings. It is compatible with various sensors and can be easily integrated into existing setups. The controller's compact design allows for straightforward installation, while its robust construction ensures long-lasting performance. Meeting industry standards for safety and reliability, the RM7890B2014/U is an excellent choice for both commercial and residential applications, providing dependable control for optimal comfort.