SC Heating Practice Questions - South Carolina Heating Contractor Examination Exam

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On a conventional 24-volt gas furnace, a call for heat closes which thermostat circuit to energize the heating control sequence?

R to G only, which starts the condenser R to W, which starts the heating sequence (ignition, gas valve, then blower after fan-on delay) Y to C only, which opens the gas valve immediately O to B, which is the only heat-call pair on every furnace

Correct Answer:

R to W, which starts the heating sequence (ignition, gas valve, then blower after fan-on delay)

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