Checking For Leaks Heater Valve and Vacuum Switch

Data
Permissible leaks in system 10 mbar/min vacuum at 300 mbar vacuum
Permissible leaks on individual components 20 mbar/min at 300 mbar vacuum
Plug-on length of connections 12 ± 2

Color code of vacuum lines for heating system

Vacuum line Color code
Suction line from intake pipe to check valve grey
Suction line from check valve to lefthand dark red-green
vacuum switch on control unit
Connecting line from lefthand to righthand 1st version 2nd version
vacuum switch on control unit red-white rubber molding
Control line from righthand vacuum switch to red
vacuum element on water valve


Special tool
Tester for vacuum systems 116 589 25 21 00

Test Step 1 And 2:

Test Step 3 And 4: