Refrigeration & Air Conditioning USCG Question #89 (Set 2)

If the superheat value of the thermostatic expansion valve is adjusted too high, what would be the result?

Official USCG Answer & Rule Citation

Correct Answer: Option A — the suction line of the compressor will be abnormally warm

High superheat settings starve the evaporator because the valve restricts refrigerant flow until higher temperatures are reached. This leaves a large portion of the evaporator inactive, resulting in insufficient cooling capacity and abnormally warm compressor suction lines.

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