Gas Fitter Practice · Question
What is the purpose of an automatic high-limit control on a forced air furnace?
The high-limit control is a safety device preventing overheating of the furnace heat exchanger.
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Question: What is the purpose of an automatic high-limit control on a forced air furnace?
Answer options:
- To regulate the fan speed. ✅ To shut down the burner if the plenum temperature exceeds a safe limit.
- To control the ignition sequence.
- To adjust the gas pressure to the burner.
Correct answer: To shut down the burner if the plenum temperature exceeds a safe limit.
Explanation: The high-limit control is a safety device preventing overheating of the furnace heat exchanger.
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