FAQ

The “new” R  1234yf refrigerant has a different chemical composition and thus other properties than R  134a. The service unit’s pressurized containers, hoses, gaskets and manometers have to be adapted accordingly. R  1234yf  (R1234yf) may never be processed in service units designed for use with R  134a. Refrigerant storage conditions are also different from those formerly applicable. Workshop operators must provide for proper ventilation and ensure operating safety regulations are met.

According to the risk analysis of the German TÜV the service unit may only be used for charging A/C systems that have no leaks. To meet this requirement the A/C system is first put under vacuum (negative pressure) and checked for pressure changes for a certain period of time. Then a little amount of refrigerant is added to generate positive pressure, and the system is again monitored at a constant pressure level. If the pressure rises or falls in either of the two phases you will know that the A/C system leaks. In that case the service unit will interrupt the process and display an error message.

To guarantee accurate charging at all times it is then necessary to recover the pre-charged amount of refrigerant and completely evacuate the A/C system before. Once this has been done you can go ahead and charge the required amount of refrigerant.

R 1234yf can be flammable when it is present in certain quantities and comes in contact with oxygen. Therefore, keep the A/C service unit away from open flames or other sources of ignition in case of damage. The refrigerant itself is nontoxic. However, like any other gas, it replaces the oxygen needed for breathing. Should refrigerant escape, keep your calm, leave the building and make sure there is sufficient supply of fresh air. As usual, you should wear suitable protective clothing and equipment (goggles and gloves) when dealing with refrigerant. These are included with each service station.