It is absolutely essential that hydronic heating system hot water piping be kept free of air. Assuming that a system is initially properly filled with water, what is the primary source of air contamination?
β’ Closed hydronic heating systems and how water is added or replaced β’ How air can enter a system that was initially filled correctly β’ The roles of makeup water, vents, and expansion tanks in a hot water system
β’ In a closed hot water system that starts completely full of water, under what normal operating condition would new water need to be added? β’ When new water is added to a system, what might that water naturally contain, even if no vents are left open? β’ Which of the listed components routinely connects the system water to an outside source that is not already airβfree?
β’ Identify which option involves a regular connection to an external water supply. β’ Ask yourself which path is most frequently used during normal operation, not during a fault or unusual event. β’ Consider which option would most likely introduce dissolved air rather than obvious air leaks.
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