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.