A technician retrofitting an R-22 system to an HFC replacement changes the oil and refrigerant. Which additional component is most commonly replaced during the retrofit?
a.The condenser fan motor
b.The filter-drier
c.The evaporator coil
d.The disconnect switch
Explanation
During a retrofit, the filter-drier is commonly replaced to protect the new refrigerant and oil charge and to capture any residual moisture or contaminants. The metering device may also need adjustment or replacement. The evaporator, condenser fan motor, and disconnect are not routinely changed just because of a refrigerant retrofit.
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