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← TechnologyWhich outcome occurs when back pressure decreases dramatically in an evaporator?
A)Coil icing and freeze-up forms✓
B)Superheat reaches inefficient levels
C)Condenser pressure drops significantly
D)System capacity becomes linearly greater
💡 Explanation
Icing occurs due to the *vaporization temperature drop*: decreased back pressure causes significantly lower evaporator temperature because the refrigerant boils at a lower temperature. Therefore, moisture freezes rather than evaporates on the coils, and restricts the airflow, unlike superheat increasing because of insufficient refrigerant.
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