R12 and R134a are types of refrigerants used in air conditioning and refrigeration systems. R12 is an older refrigerant that has been phased out due to environmental concerns, while R134a is a more environmentally friendly alternative.
The formula to convert R12 to R134a is:
\[ \text{R134a Charge (lbs)} = (\text{R12 Charge (lbs)} \times 0.9) - 0.25 \]
Consider an R12 charge of 2 lbs:
Using the formula:
\[ \text{R134a Charge (lbs)} = (2 \times 0.9) - 0.25 = 1.55 \text{ lbs} \]
This means the R134a charge is 1.55 lbs.
