Refrigerant: Description and Operation

Refrigerant and Refrigerant Oil Capacities

- Operate the A/C system after filling the refrigerant circuit, refer to => [ A/C System, Operating after Filling Refrigerant Circuit ] A/C System, Operating after Filling Refrigerant Circuit.

• Different capacities for refrigerant R134a and refrigerant oil are designated, depending on refrigerant circuit design (with one or two heating & A/C units / evaporators). Refer to the Electronic Parts Catalog.

• Compressor as replacement part has different refrigerant oil capacities, therefore note the exact part number, refer to the Electronic Parts Catalog. The reason for the different refrigerant oil capacities in the compressor lies in the design of the compressor itself, note these refrigerant oil capacities. Too much oil in the circuit leads to higher pressures and reduces cooling performance of the system. Too little refrigerant oil may lead to lubrication problems in the compressor.

• When charging the A/C system, always use maximum amount of refrigerant R134a, as some of the refrigerant remains in the hose of the refrigerant recovery, recycling and recharging unit.

• Only add approved refrigerant oils to the refrigerant circuit. Refer to the Electronic Parts Catalog.

• Different refrigerant oils are required for A/C compressors made by Denso, Sanden and Zexel/Valeo. Refer to the Electronic Parts Catalog.

• Use only the specified oil from a sealed container and always reseal oil container immediately after use (PAG oil absorbs moisture). Do not use oil if it is contaminated with moisture or if oil container has been left open.