Gas Fitter Practice · Question
What is the primary function of a high-limit switch on a gas-fired furnace?
The high-limit switch is a safety device that shuts off the burner if the furnace heat exchanger or plenum temperature exceeds a safe operating limit, preventin
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Question: What is the primary function of a high-limit switch on a gas-fired furnace?
Answer options:
- To control the blower fan speed ✅ To prevent the furnace from overheating
- To ignite the pilot light
- To regulate gas pressure to the burner
Correct answer: To prevent the furnace from overheating
Explanation: The high-limit switch is a safety device that shuts off the burner if the furnace heat exchanger or plenum temperature exceeds a safe operating limit, preventing overheating.
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Question explanations
- What is the maximum allowed pressure for a propane system supplying a residential appliance?
- When installing a gas outdoor appliance, what is the minimum required clearance from an opening into a buildin
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