As an engineer you notice pressure drops across the evaporator. You check and notice the external equalizer line is disconnected. What will occur in the evaporator?

• A. Evaporator will overheat
• B. Evaporator will flood
• C. Evaporator will freeze
• D. Evaporator will depressurize

Answer: (B)

External equalizer line lets the expansion device sense the actual evaporator pressure so it can meter refrigerant correctly. When that line is disconnected, the valve loses the evaporator pressure signal and tends to open more than it should, pushing excess liquid refrigerant into the evaporator. The evaporator then becomes flooded because more liquid enters than can be vaporized, reducing vapor generation and potentially returning liquid to the compressor.

That flooding outcome fits because the problem is an overfeed due to lost pressure sensing, not overheating, depressurizing, or freezing.