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) That the system is undercharged.
B) That the system is overcharged.
C) Excessive humidity in the air, causing the coil to frost up.
D) Reduced airflow across the evaporator.
D
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