An air conditioner is operating with low system pressures, an evaporator saturation temperature of 20°F, and a suction line temperature of 24°F. The suction line is frosting. The most likely cause of these symptoms is:
A) The system is overcharged.
B) Reduced airflow across the evaporator.
C) Excessive humidity in the air, causing the coil to frost up.
D) The system is undercharged.
B
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