Engine : Refrigeration AC - 597/610
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| 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? |
| A) The introduction of air via the makeup water. |
| B) The introduction of air via the expansion tank vent. |
| C) The introduction of air with the convector steam supply. |
| D) The introduction of air via the atmospheric drains tank vent. |
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