Components, Replacing

Components, Replacing

- All components of the refrigerant circuit submitted for quality observation are always to be sealed (use original sealing caps of replacement part).
- To date, the following replacement parts (compressor, reservoir, receiver, evaporator and condenser) have been filled with nitrogen gas. This charge is being gradually discontinued/the pressure of the nitrogen charge is now so low that escape of gas is no longer perceptible on initial opening.
- On vehicles installed with a compressor with no A/C clutch, the engine is only to be started following complete assembly of the refrigerant circuit (compressor always in operation as well).
- So that the compressor with A/C Compressor Regulator Valve N280 (without A/C clutch) is not damaged when the refrigerant circuit is empty, it is equipped with a secured oil supply. This means that approx. 40 to 50 cu.cm of refrigerant oil remains in the A/C compressor.

NOTE:
- As parts are sometimes stored for lengthy periods and at different locations within the spare parts organization, it is entirely possible that gas will escape from some parts and not from others on initial opening (even in the case of identical spare part numbers). Sealing caps at replacement part connections are therefore to be removed carefully and the nitrogen gas allowed to escape slowly.
- The refrigerant circuit is installed either with a restrictor and reservoir or an expansion valve and receiver.
- Seal open connections and pipes (to prevent absorption of moisture).
- Always replace restrictor.
- Reservoir/receiver or desiccant bag/dryer cartridge must not be replaced under the following conditions.
- After an accident, however there is no damage at reservoir/receiver.
- Repairs are performed quickly (not beyond the normal repair time) and no moisture has penetrated. Vehicle is not older than 5 years.
- Reservoir/receiver or dryer cartridge is to be replaced under the following conditions.
- Refrigerant circuit was opened and vehicle is older than 5 years.
- Refrigerant circuit has been open for an uncertain time period (creeping leak).
- Repairs proceed beyond the normal repair time period and moisture has penetrated.
- Always replace reservoir/receiver or dryer cartridge after flushing the refrigerant circuit, and keep them sealed for as long as possible so that the absorption of moisture is minimized.
- A/C compressor has locked-up.
- Reservoir / receiver is damaged (due to accident).

CAUTION: Contaminated refrigerant oils are to be disposed of as used oils of unknown origin.
HSO Environment Vol. 2-2. 43.1