The pressure or vacuum in a small appliance refrigeration system about to be opened for repair regardless of when the recovery device was manufactured should be brought to what value?
ā¢ EPA Section 608 requirements for opening small appliance refrigeration systems ā¢ Difference between psig (gauge pressure) and inches of mercury (Hg) or inches of Hg vacuum ā¢ Safety and environmental reasons for reducing system pressure before opening
ā¢ Which of these units (psig vs inches Hg vs inches Hg vacuum) would most clearly show that the system is just slightly above or below atmospheric pressure? ā¢ What condition does the EPA want the system at before opening: a deep vacuum, a strong positive pressure, or just enough to be sure no air or refrigerant rushes in or out? ā¢ Think about what is safest for the technician and best for minimizing refrigerant release when lines are disconnected.
ā¢ Confirm what atmospheric pressure is in psig and how that relates to 14.7 psia (absolute pressure). ā¢ Check whether EPA requirements call for a deep vacuum on small appliances before they are opened, or simply that they are not under high pressure. ā¢ Make sure you understand the direction of flow: will refrigerant escape or air enter the system at each of the listed pressures/vacuums?
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