Minnesota Boiler License Practice Exam

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Study for the Minnesota Boiler License Exam. Deepen your knowledge with expertly designed flashcards and multiple choice questions, each complete with helpful hints and detailed explanations. Get prepared for your licensing success!

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After a hot water boiler has been drained, cleaned, and refilled with water, what must be done?

Reset aquastats
Blowdown
Evacuation of air from the system
Reset the sail switch

The correct answer is: Evacuation of air from the system

After a hot water boiler has been drained, cleaned, and refilled with water, it is crucial to evacuate air from the system. This process is essential because air trapped in the boiler and the piping can lead to various operational issues, including reduced efficiency, noise, and potential damage to the system. When air accumulates in the pipes, it can create air pockets that hinder water flow, leading to inadequate heating and uneven temperature distribution. By bleeding or purging the air out of the system, you ensure that water can circulate freely, allowing the boiler to operate effectively and maintain the desired heat levels efficiently. This process enhances the system’s overall performance and longevity. In contrast, resetting aquastats, performing blowdown, or resetting the sail switch are not immediate steps taken after refilling the boiler with water. These actions may be necessary at different points in maintenance or troubleshooting, but the immediate priority following a refill is to remove any air from the system to ensure safe and efficient operation.