Which risk increases when an HVAC refrigerant pump operates below minimum superheat?

💡 Explanation

Vapor cavitation erodes the impeller because at low superheat, liquid refrigerant partially vaporizes in the pump decreasing pressure, leading to bubble formation and collapse. Therefore, pump damage increases rather than oil or COP issues arising, as pump damage is primary at minimum superheat conditions.

• Which risk increases when halocarbon refrigerants degrade under intense UV exposure?
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• Within a chiller system, which outcome occurs when refrigerant overcharge surpasses thermal expansion valve (TXV) capacity?
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