AK HVAC Practice Questions - Alaska Mechanical Administrator HVAC License Exam

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What is the proper method to prevent freeze damage to a hydronic heating system when a building will be unoccupied for an extended period in Alaska?

Turn off the power and hope for the best Drain the entire system completely or add propylene glycol antifreeze to protect against the lowest expected temperature Simply lower the thermostat to 50°F Open all windows to equalize indoor and outdoor temperatures

Correct Answer:

Drain the entire system completely or add propylene glycol antifreeze to protect against the lowest expected temperature

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