How can I convert my R-12 to R-134a?
Steps To Convert R-12 to R-134a Take the vehicle to a repair shop licensed for A/C work that can evacuate the system of R-12 and recover it properly. Using an A/C flush kit, flush the evaporator and condenser to remove any remaining mineral oil in the system.
When to change refrigerant from R12 to R134a?
Now in order to abide by the law, the cars manufactured before 1995 needed to have a refrigerant conversion from R12 to R134a, which also led to further complexities. As R12 used a different oil that was not fit to be used with R134a, the replacement was not that simple.
What’s the difference between R12 and R134a charge level?
This indicates that an R12 charge level of 2 lbs. converts to an R134a charge level of 1.55 lbs. While the formula above is helpful, you might be strapped for time and need an answer quickly. Below is a PDF of tables that show R12 to R134a refrigerant charge conversions in pounds and ounces:
What’s the difference between a R12 and are 134a heat exchanger?
In order to do the same job, an R-134a system will need a larger compressor and larger heat exchangers. As a result, a system that is retrofitted from R-12 to R-134a will have lower capacity (run longer) and will probably develop higher head pressures (not enough condenser area).
What happens when you convert R12 to R134a?
As a result, a system that is retrofitted from R-12 to R-134a will have lower capacity (run longer) and will probably develop higher head pressures (not enough condenser area). Check out the entire discussion here.
Which is better R12 or R134A cooling system?
Since R134a is LIGHTER than R12, you must convert the charge weight to get the proper charge during your retrofit. Fill the system with 75 to 85% of the factory specified capacity to achieve the best cooling. Use this formula or the chart below.
What should the charge be on a 134a refrigerant?
5 – When converting an R12 system to 134a, charging amounts vary from system to system. A good starting point for charging 134a on your freshly converted system is typically about 70% of the original R12 charge, and the final charge amount will be no more than 80%.
Which is lighter R12 or R134a refrigerant?
The volume of r134a refrigerant is lighter than the same amount r12 refrigerant. This not only is important to know for commercial refrigeration units, but it also is vital when making repairs on HVAC equipment and even cars.