š Key Concepts
ā¢ Service ports and hose connections on each manifold set in the illustration (VAC, REF, and center ports)
ā¢ How vacuum pump and refrigerant source are normally connected during evacuation vs. charging
ā¢ Which manifolds allow both vacuum and charging through the same center port without moving hoses
š Think About
ā¢ For each manifold (A, B, C, D), identify which port you would use to connect the vacuum pump during dehydration and which port you would use to connect the refrigerant supply during charging. Are they the same or different?
ā¢ Look at the labeling and number of ports on each manifold. Which ones are clearly marked for VAC and REF, and which have multiple center ports that could stay connected?
ā¢ Decide for each manifold: can I go from vacuum to charging just by closing one valve and opening another, or must I physically move a hose to a different fitting?
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Before You Answer
ā¢ Verify which manifolds have separate dedicated VAC and REF center ports instead of a single shared service port
ā¢ Confirm where the middle (or extra) hose would be during evacuation and where it must be during charging for each manifold
ā¢ Before choosing an answer, make a small list: for A, B, C, D write "switch hoses" or "no switch", then match your pair to the choices.