Restrictor and Reservoir (With Internally Regulated Compressor), Checking

Restrictor and Reservoir (With Internally Regulated Compressor), Checking

NOTE:
- Connect service station. Working With Service Station
- Observe test conditions. Pressures In Refrigerant Circuit, Checking (Using Service Station)

- Set engine speed to 2000 RPM.
- Observe pressure gauge of service station.

NOTE:
- Switching pressures for refrigerant circuit switches are vehicle-specific.
- Connection with valve for low-pressure switch or at evaporator is only to be used for vehicles with no service connection on low-pressure side and an inaccessible connection at compressor or reservoir (measurement accuracy). Only applies to certain vehicles.

Specified values:

High pressure side:
Increasing from initial pressure (on connecting pressure gauges) to max. 20 bar.

Low pressure side:







Decreasing from initial pressure (on connecting pressure gauges) to value in graph.
A - High pressure (measured at service connection) in bar
B - Low pressure (measured at connection with valve at compressor or reservoir) in bar.
C - Permissible tolerance range.
D - Low pressure (measured at connection with valve for low-pressure switch or at service connection) in bar.
E - Permissible tolerance range.







NOTE: If no malfunction is found in relation to this complaint, flush refrigerant circuit with compressed air and nitrogen.










NOTE:
- For the malfunction "high pressure normal, low pressure too low", note the following:
- This malfunction may cause the evaporator to ice up or the A/C Refrigerant Low Pressure Switch F73 to shut off the compressor although the amount of refrigerant in the circuit is OK.







NOTE: Overfilling with refrigerant oil can occur if, for example, the compressor has been replaced without adjusting the quantity of refrigerant oil.