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.
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.
Chapter25: Television, Telephone, And Low-voltage Signal Systems
Section25.3: Signal System
Problem 14R: a. How many wires are run between the front hall chime and the extension chime in the recreation...
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4. 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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