Instructions for Handling Refrigerant R 134a

64 50 ... - Instructions for handling refrigerant R 134a

Work on the refrigerant circuit may only be carried out by experts!
Avoid all contact with liquid or gaseous R 134a. Wear protective goggles and gloves when working on the refrigerant circuit.
- Follow safety instructions 64 53 518 Replacing Desiccant Insert For A/C System (Capacitor Removed) for handling R134a refrigerant.

Warning!
Although R 134a at normal temperature is non-toxic, non-flammable and not explosive in air in any mixture ratio, it is still essential to follow various safety precautions.

As a gas, R 134a is colorless, odorless and heavier than air. If it gets into the atmosphere, this may result especially in workshop pits in an imperceptible danger of asphyxiation or in cardiac palpitations. Ventilate rooms adequately; if necessary, turn on installed extractor systems.

Store charged refrigerant pressure flasks in a place where they are not exposed to direct sunlight or any other heat source (max. 45 °C). Also avoid exposing them to mechanical stress (e.g. by dropping).
Do not weld or solder on filled A/C systems or in rooms into which R 134a may have leaked. Exposure to flames or high temperatures (≥ 50 °C) may give rise to toxic decomposition products (fluorine gas). For this reason, do not smoke either.
In the event of fire, carbon dioxide (CO2), extinguishant powder and a sprayed water jet are deemed to be suitable extinguishants. Cool reservoirs at risk with a sprayed water jet (risk of bursting!).
If the protective caps on the filler valves are difficult to open, there is a risk of injury from leaking valve inserts (high pressure).
The filled refrigerant circuit of the A/C system is subject to gauge pressure. Before carrying out repairs on the A/C system, it is absolutely essential to draw off the refrigerant.
- Before conducting repairs, check the actual pressure drop on the pressure gauge of the A/C service station.
R 134a must be drawn off, cleaned and returned to the A/C system with an A/C service station following the relevant operating instructions.
For a properly functioning A/C system, it is essential to have the greatest possible levels of cleanliness when working on the A/C system and the longest possible evacuation (at least 30 minutes dehumidification from refrigerant circuit) before each filling of the A/C system.
R 134a absorbs moisture very easily. Therefore seal off opened pipes, condenser, evaporator, compressor and drier bottle immediately with plugs.
- If an A/C system has been completely drained by leakage, accident or repair, the desiccant insert Service Precautions must be replaced as excessive moisture may have entered the system.
With replacement parts, the plugs may only be removed immediately before the lines are connected. In the event of warranty claims, the old parts must be provided with plugs to be able to determine the cause of the damage.

Installation Note:
After each refill of an A/C system, check that the protective caps of the filler valves are hand-tight. They serve as additional seals.