In Figure 12 of your study unit, the contact SA1 in the electric furnace control closes A. whenever the 24-V transformer is energized. B. when the load limit switch (LS 1) operates. C. immediately when the thermostat calls for heat. D. when the heater coil sequencer (HTRSEQ1) operates.

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Electrical Heating Unit

The conversion of electrical energy to heat energy is known as electric heating. The heating system that converts the electrical energy to heat energy for various application is called electrical heating unit. Electricity is employed as the firing mechanism in electric heating systems, which transforms electric current to heat. Electric heaters have heating elements in the form of electric resistors.