Refrigerant R1234YF Charge Factor

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Audi SQ5, 2024 Audi Q5 e, 2024 Audi Q5, 2023 Audi SQ5, and 2023 Audi Q5 e. However, it is still accessible from the selected car via links, so may be relevant.

When filling compressed-gas cylinders (return cylinders, recycling cylinders etc.) the applicable regulations, technical regulations and laws must be observed.
Overfilling of compressed-gas cylinders (return cylinders, recycling cylinders etc.) must always be avoided. Overfilled compressed-gas cylinders do not have a sufficient gas cushion to accommodate the liquid expansion caused by the effects of heat. There is a danger of rupture.
To ensure safety, only use compressed-gas cylinders fitted with a safety valve.
Return cylinders and recycling cylinders must either be weighed on a scale while filling, or if filling by volume, make sure that the specified permitted weight of the cylinder is not exceeded after filling. The maximum permitted capacity is 80% of the maximum refrigerant quantity of the fill weight specified on the return cylinders and recycling cylinders, or 70% of the maximum fill volume (charge factor, the smaller value always applies). Explanation: there is no guarantee that refrigerant oil was also added to the return and recycling cylinders in addition to the refrigerant.
A cylinder must have space for vapor as well as liquid. As the temperature rises, the liquid expands. The space filled with vapor decreases. At a certain point, there will only be liquid in the cylinder. Beyond this, even a slight increase in temperature causes a large amount of pressure to build up in the cylinder as the liquid attempts to continue expanding despite the absence of the necessary space. The forces that result are strong enough to rupture the cylinder. To prevent a cylinder from being overfilled, the regulations regarding compressed gases specify how many kilograms of refrigerant may be added to a cylinder per liter of internal volume. The product of multiplying this charge factor by the internal volume of the cylinder is the permissible capacity. The figure for refrigerant used in vehicles is 1.15 kg (2.54 lbs) / liter.
Because contaminated refrigerant can have another density as clean refrigerant R1234yf always pay attention to the maximum permitted charge factor.