During an R-12 to R-134a conversion, what is the recommendation concerning the original receiver/dryer?

In the context of an R-12 to R-134a conversion, the recommendation regarding the original receiver/dryer is that it should not be replaced. This is due to the fact that the original receiver/dryer can often be compatible with R-134a, provided it has been properly evacuated and cleaned.

The existing receiver/dryer can be retained if it is in good condition and free from moisture and contaminants, as the primary function of this component is to filter out debris and moisture from the refrigerant. However, it’s crucial to ensure that the receiver/dryer has not been in use for a long time or has been exposed to any form of contamination that may impact its performance with the new refrigerant.

Using the original equipment can save costs and time during the conversion process, as long as it meets the necessary requirements and functionality. The use of a new receiver/dryer may be recommended in other scenarios, particularly if it is suspected that the component has deteriorated or if the manufacturer specifically advises so for the types of refrigerants being used. However, with proper preparation, the old unit can effectively function with the new refrigerant type.