AZ ROC R-4R Boilers (Residential) Practice Questions - Arizona ROC R-4R Boilers (Residential) Examination Exam

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Where should a diaphragm expansion tank be connected relative to the system circulator pump in a closed residential hydronic heating system?

On the suction (inlet) side of the circulator pump at the point of no pressure change. On the discharge (outlet) side of the circulator pump to maximize system pressure. At the lowest return line header point immediately before entering the boiler drain valve. On the cold water makeup supply line downstream of the backflow preventer only.

Correct Answer:

On the suction (inlet) side of the circulator pump at the point of no pressure change.

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