What is the purpose of a sequencer in electrical control systems for HVAC equipment?

The purpose of a sequencer in electrical control systems for HVAC equipment is to control the order of operations for multiple heating elements. In systems that utilize multiple heat sources, such as electric furnaces or multi-stage heating systems, a sequencer manages how and when each heating element is activated. This prevents all elements from turning on simultaneously, which could lead to excessive electrical demand and potential overload.

By selectively activating the heating elements based on the required output and demand, the sequencer improves efficiency and maintains stable operation of the system. This is particularly important in applications where energy consumption needs to be minimized and equipment longevity is a consideration. It ensures that the heating elements are engaged in a sequence that corresponds with the heating needs, thereby optimizing performance and comfort levels in the conditioned space.