The function of a heat sequencer is to _________.

• A. stagger the start of electric heaters to prevent circuit overload
• B. progressively increase thermostat setpoint
• C. synchronize compressor and fan speeds
• D. prevent defrost cycles

Answer: (A)

The function of a heat sequencer is to stagger the start of electric heaters to prevent circuit overload. In systems with multiple heat strips, turning all elements on at once can create a large inrush current that overloads wiring, blows fuses, or trips breakers. The sequencer energizes heaters one after another in steps, distributing the electrical load over time and keeping the peak current within safe limits. This also helps maintain stable voltage to the control circuit and reduces wear from sudden surges. Other options describe actions not related to how electric heat elements are activated, such as changing thermostat setpoints, syncing mechanical components, or managing defrost cycles.