Which outcome occurs when an HVAC evaporator's airflow is severely restricted?

💡 Explanation

When evaporator airflow is restricted, reduced heat transfer causes lower refrigerant vaporization because less heat is absorbed. Therefore, liquid refrigerant floods back through suction lines, rather than valve restriction, higher superheat, or oil overheating, which require different causes.

• Which outcome occurs when back pressure decreases dramatically in an evaporator?
• Which outcome occurs when reverse flow arises within centrifugal pumps?
• Which risk increases when an oil-filled transformer experiences elevated operating temperature?
• Which outcome occurs after sustained operation of automotive AC with refrigerant overcharge?
• Which outcome occurs when anti-surge valve rapidly cycles in a centrifugal compressor system?
• Which outcome occurs when excessively worn diverter contacts in a high-voltage tap-changing transformer cause sustained arcing?