How does a sequencer work in HVAC applications?

In HVAC applications, a sequencer is a control device that manages the operation of multiple heating or cooling units to ensure efficient and coordinated performance. It activates and deactivates equipment in a predetermined sequence based on demand, preventing simultaneous operation of units that could overload the system. By optimizing the use of resources, a sequencer enhances energy efficiency, maintains desired temperature levels, and extends the lifespan of HVAC components. Typically, it operates through relay contacts or a microcontroller that monitors system conditions and adjusts unit operation accordingly.