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HVAC 145 GAS/HEAT PRACTICE FINAL EXAM QUESTIONS AND ANSWERS
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13

July 2025

2024/2025

A
a gas valve with 100% shut off means: - Gas to a pilot and manifold is shut-off A gas furnace has an electronic control board. How is the fan cycled during heating? - time A primary cause of burner "flashback" is: - Low manifold pressure The reason for a crossover on a gas burner is to - Provide smooth lighting of all burners A technician need to run thermostat wire 75 feet. To avoid a voltage drop, the technician should use: - # 16 AWG A gas furnace has an induced draft fan...
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