Espresso Pump - Setting The Brewing Pressure - WMF espresso Service Manual

Service
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Espresso pump - Setting the brewing pressure

The pump and brewing pressure is set to 9 +0,5 bar at the factory. If a new espresso pump is being installed or if the desired brewing pressure is different from
the setting, then this can easily be adjusted via the front access panel.
Level of disassembly—right drip tray grid and drip tray, rear cover
Machine is ready for operation
Important note for technicians:
The system and its components are designed for a maximum of 10 bar. This pressure must not be exceeded. The maximum water pressure occurs during cleaning,
when the blind sieve is installed and no water is flowing (back pressure).
Changing the brewing pressure has a substantial effect on the brewing time, extraction times, and beverage quality.
If the brewing pressure must be changed, therefore, the beverage settings absolutely must be checked and may need to be readjusted.
Setting the brewing pressure
 Start an Espresso (with brewimg time of at least 15-30 sec.)
 Read the brewing pressure from the manometer
 Adjust the desired brewing pressure using the bypass screw
 Clockwise
 Counter-clockwise -> Reduced brewing pressure
 Target pressure should be at 9 bar – max. 10 bar

Check settings by initiating an espresso three times
-> Increased brewing pressure
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