Referring to the illustrated drawing of the central-station hookup for a hot-water heating system, what statement is true concerning the air separator on the heated water outlet of the converter? GS-0151

Correct Answer: Option C — The air separator removes the entrained air introduced with the makeup water at the expansion tank and ultimately released by the heating process within the converter.

Air separators are critical in hydronic systems to remove dissolved gases introduced by makeup water. By venting these gases, the system prevents air binding in coils, reduces noise, and minimizes internal corrosion, ensuring efficient heat transfer and longevity of the heating converter and associated piping infrastructure.