Which of the listed sequence of events...

Question 1 / 205eccefa3bacbc34ba4d47c56

Question 1 of 205eccefa3bacbc34ba4d47c56

Which of the listed sequence of events occurs when an automatic auxiliary boiler is pre-purged?

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Question 1 of 20

5eccefa3bacbc34ba4d47c56

Which of the listed sequence of events occurs when an automatic auxiliary boiler is pre-purged?

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🔍 Key Concepts

• Purpose of a pre-purge cycle in an automatic boiler (safety: clearing furnace of unburned fuel/combustibles) • Relationship between air flow, furnace damper position, and firing rate (high fire vs low fire) • Sequence on most automatic burners: air-only purge before any ignition or fuel admission

💭 Think About

• Before any flame is established, what must the burner management system accomplish to prevent furnace explosions? • During a pre-purge, do we want maximum or minimum air flow through the furnace, and why? • After the timed purge is complete, in what general condition should the burner be left so it is ready to light off (think about firing rate and damper position)?

✅ Before You Answer

• Confirm that pre-purge occurs before fuel and ignition are introduced to the furnace. • Check which options describe maximum air flow through the furnace during the purge period. • Verify which answer leaves the system in a safe, stable position to start at low fire after the purge is finished.

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Question 1 of 20

Which of the listed sequence of events occurs when an automatic auxiliary boiler is pre-purged?

The damper on the inlet side of the furnace is moved to the open position for a given number of seconds and then moved to the closed position.

The damper on the inlet side of the furnace is moved to the open position for a given number of seconds and then moved to the low fire position.

The damper is moved to the closed position for a given number of seconds and then moved to the low fire position.

The damper in the uptakes is moved to the wide-open position for a given number of seconds and then moved to the low firing rate position.

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Question 1 / 205eccefa3bacbc34ba4d47c56

Question 1 of 205eccefa3bacbc34ba4d47c56

Which of the listed sequence of events occurs when an automatic auxiliary boiler is pre-purged?

Back

Question 1 of 20

5eccefa3bacbc34ba4d47c56

Which of the listed sequence of events occurs when an automatic auxiliary boiler is pre-purged?

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

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