1 689 975 254 2014-01-14| Robert Bosch GmbH
18 | CRR 120 | en
1. Symbols used 19
1.1 In the documentation 19
1.1.1 Warning notices -
Structure and meaning 19
1.1.2 Symbols in this documentation 19
1.2 On the product 19
2. Safety instructions 19
3. Repair 19
4. Testing 20
4.1 Test requirements 20
4.2 Tools and test equipment 20
4.3 Checking CRR 120 20
5. CRR 120 design 21
5.1 Overview 21
5.2 Pneumatic system diagram 22
5.3 Circuit diagram 23
5.4 Terminal strip X1 24
6. Fault matrix 25
7. Information on fault rectification /
component replacement 26
7.1 Potentiometer /
potentiometer knob defective / stem slipping 26
7.2 Opening CRR 120 26
7.3 Inlet valve WAP 3/2 with red actuator 27
7.4 Checking fuse / diode 28
7.5 Checking display module 28
7.6 Valve WST 5/2 with white actuator 29
7.7 Checking/adjusting pressure switch PM1 29
7.8 Checking/replacing pressure control valve
ED02 30
7.9 Replacing selector switch 30
7.10 Checking/replacing pressure sensor P WIKA 31
7.11 Note on hose Vol 31
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