The main advantage of primary-secondary piping around the boiler is to protect the return water temperature above what value?

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Study for the NOCTI Plumbing Test. Prepare with flashcards and multiple choice questions, each question comes with hints and explanations. Ensure your success on the exam!

Multiple Choice

The main advantage of primary-secondary piping around the boiler is to protect the return water temperature above what value?

Explanation:
Primary-secondary piping decouples the boiler from the zone circuits, so the boiler sees a hotter return water than the zones feed back. This arrangement aims to keep the water returning to the boiler above a safe temperature, commonly around 140°F. Staying above this level helps prevent condensation of combustion gases inside the boiler and protects against corrosion and thermal stress in non-condensing boilers. If the return gets much cooler, condensate can form and cause damage over time. That’s why 140°F is the target value for protecting the boiler, making it the best choice.

Primary-secondary piping decouples the boiler from the zone circuits, so the boiler sees a hotter return water than the zones feed back. This arrangement aims to keep the water returning to the boiler above a safe temperature, commonly around 140°F. Staying above this level helps prevent condensation of combustion gases inside the boiler and protects against corrosion and thermal stress in non-condensing boilers. If the return gets much cooler, condensate can form and cause damage over time. That’s why 140°F is the target value for protecting the boiler, making it the best choice.

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