The definition of an ABB HVAC Controls system is a comprehensive system that is designed to provide energy efficient, reliable, and safe climate control for commercial and industrial buildings. It is an integrated system that includes components such as sensors, controllers, actuators, and software. This system is designed to monitor and adjust the temperature, humidity, and air quality of a building in order to maintain a comfortable and healthy environment. The system can also be used to reduce energy costs by optimizing the use of energy resources. Additionally, it can be used to reduce the risk of fire, smoke, and other hazardous conditions. The ABB HVAC Controls system is a reliable and cost-effective solution for businesses that need to maintain a comfortable and safe environment for their employees and customers.