Which outcome occurs when a heat pump's outside coil temperature drops significantly below freezing in high humidity?

💡 Explanation

When the outdoor coil temperature drops and humidity is high, frost formation occurs because moisture freezes on the cold surface, acting as an insulator and reducing heat transfer. Therefore, reduced heat transfer results, rather than floodback, supercooling, or stall, each of which requires different operational faults.

• Which outcome occurs when mineral oil is used in an air conditioning system designed for R-134a refrigerant?
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• Which outcome occurs when a progressive cavity pump stator elastomer degrades due to incompatible fluid?
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• Which outcome results when a faulty autotransformer lacks appropriately rated circuit breakers?