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Master of HVAC: The Ultimate Heating & Cooling Maintenance Quiz
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What does a high-limit switch do in a gas furnace?
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50-50
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Audience
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A
It increases the fan speed when the house is too cold
B
It shuts off the burners if the heat exchanger gets dangerously hot
C
It regulates the gas pressure entering the manifold
D
It turns on the air conditioner if the furnace fails
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