When the flame scanner senses flame failure...

Question 1 / 205eccefa0bacbc34ba4d46eb9

Question 1 of 205eccefa0bacbc34ba4d46eb9

When the flame scanner senses flame failure during boiler operation, which of the listed events will occur FIRST?

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Question 1 of 20

5eccefa0bacbc34ba4d46eb9

When the flame scanner senses flame failure during boiler operation, which of the listed events will occur FIRST?

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🔍 Key Concepts

• Boiler safety interlocks and their purpose after a flame failure • The normal sequence of operations in an automatic boiler start-up and shutdown cycle • Difference between safety shutdown actions and start-up (purge/ignition) actions

💭 Think About

• Think about what the control system must do immediately to remove any dangerous condition when flame is suddenly lost, before it does anything else. • Consider which device directly controls fuel entering the furnace and how quickly it can act compared to pumps or programmed cycles. • Ask yourself: do purge and trial-for-ignition steps begin right away, or only after a safe shutdown condition has first been established?

✅ Before You Answer

• Verify which component directly stops fuel flow into the furnace in the shortest possible time. • Confirm whether the service pump is required to stop instantly, or if it may continue running while the burner itself is secured. • Check the typical order: secure fuel to the burner → complete safety timing → then purge → then trial-for-ignition. Make sure you know which of these happens first at the moment of flame failure.

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Question 1 of 20

When the flame scanner senses flame failure during boiler operation, which of the listed events will occur FIRST?

The fuel oil solenoid valve is de-energized.

The fuel oil service pump is stopped.

The automatic purge cycle commences.

The "trial for ignition" period commences.

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Question 1 / 205eccefa0bacbc34ba4d46eb9

Question 1 of 205eccefa0bacbc34ba4d46eb9

When the flame scanner senses flame failure during boiler operation, which of the listed events will occur FIRST?

Back

Question 1 of 20

5eccefa0bacbc34ba4d46eb9

When the flame scanner senses flame failure during boiler operation, which of the listed events will occur FIRST?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed