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Test the supply volt- floor drain vacuum valves to provide maximum flow. age, amperage draw, wire size against factory specifications and local codes. Test the operating refrigerant The auto vac manufacturer has a special valve that plugs pressures and corresponding components to factory into the skimmer before the auto vac hose. These spe specifications. Adjust refrigerant according to the sub cial valves will properly regulate the water flow through cooling reading and factory specification. t