All of the following statements about thermostatic expansion vales on retrofitted systems are true, EXCEPT:
A. The expansion valve does not have to be replaced when retrofitting a system from R-12 to R-134a.
B. If a defective expansion valve is replaced, always use a model designed for the system refrigerant.
C. A R-12 expansion valve used in an R-134a system will result in higher superheat and reduced evaporator efficiency.
D. An R-134a valve used in a R-12 system will have reduced superheat.
Answer: C
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