Brewing Time Monitoring - WMF espresso Service Manual

Service

2.14 Brewing time monitoring

Description of basic functions
 If brewing time monitoring is activated and larger deviations arise between the ACTUAL and the TARGET contact time (contact time= pre-treatment time
+ brewing time), the customer sees an animated prompt to set the grinding degree coarser or finer and confirm the adjustments.
 Brewing time monitoring can be activated as follows:
System – Operating options
Functions control function
 The beverage recipe marked as the control parameter serves as the "reference beverage" per brewing group
 The ACTUAL contact times of the reference beverage are logged in the ring memory on a continuous basis
 If there are deviations ± 20% between the ACTUAL/TARGET - after subtracting the min/max brewing times - for over 7 brewing cycles in succession,
brewing time monitoring with kick in; via an animation in the display, the customer will be asked to adjust the grinding degree by one notch
 ACTUAL/TARGET deviations greater than +20 % means
- Animation requires that you set the grinding degree to be more coarse by one notch

ACTUAL/TARGET deviations greater than -20 % means
- Animation requires that you set the grinding degree to be more fine by one notch
 Since changing the grinding degree changes the Ground coffee quantity used = the grinding time is adjusted by the software in order to retain the con-
figured grinding volume [g]. This adjustment however is only complete when the grinding degree is ONLY actually changed by one notch AND this was
confirmed in the display.
Important notes for technicians:
 Marking the "reference beverage"/setting the TARGET contact time – see document:
 To make sure that the brewing time monitoring steps in as precisely as possible, the most frequently served beverage recipe is marked as the reference bever-
age for each brewing group. Usually this is the 1x Espresso or 1x Café Crème.

During beverage setting, the TARGET contact time determined from the average of several beverages must be defined under the Reference beverage

If brewing time monitoring is activated, the customer must receive detailed training about the following along with explanations concerning general opera-
tion of the machine:
o NO change to the beverage recipe marked as the "reference beverage"/ NO change to the TARGET contact time
o Grinding level adjustment ONLY when requested by animation
Grinding level adjustment in the correct direction/ by one notch not more! / confirm adjustment >> Follow the animation
– Brewing time control
Contact time too long = grinding degree too fine
Contact time too short = grinding degree too coarse
"WMF espresso Basic beverage settings"
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