Gas Fitter Practice · Question
Which of the following describes the primary function of a high-limit switch in a gas furnace?
The high-limit switch monitors the temperature within the furnace plenum and shuts off the burner if it exceeds a safe operating temperature, protecting the hea
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Question: Which of the following describes the primary function of a high-limit switch in a gas furnace?
Answer options:
- To prevent over-firing of the main burner.
- To detect low gas pressure and shut off the supply.
- To ensure adequate combustion air is available. ✅ To protect the heat exchanger from overheating.
Correct answer: To protect the heat exchanger from overheating.
Explanation: The high-limit switch monitors the temperature within the furnace plenum and shuts off the burner if it exceeds a safe operating temperature, protecting the heat exchanger.
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