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24

FunctionTests

ServiceManualC91/D91 enVersion1.0

Measurin gflowrate(2)

Procedure(continued):

7. Connectpressurehosetopressuretester.

8. Positionmeasuringbeakerunderneath

exittubeofpressuretester.

9. Switchonmachine.

10. Presscoffeebuttonafterheatingup.

11. Openvalvefullytillwaterbeginstoflow.

12. Closevalveslowlyuntil12barareindi

cated.

Themanometermustbeobserved

continuouslyandthepressureregu

latedusingthevalveifnecessary.

Withincreasingtemperaturethe

pressurealsoincreases,ifneces

saryreadjustthepressureto12bar.

13. Performmeasurementforapprox.30sec.

14. Theremustbeatleast60  120 mlwater

inthemeasuringbeaker.

Notice:

 Withaflowof<60mlthepumpisdefective

orthere isaleakinthesystem.

 Largefluctuationsinthepressuregauge

readings(±4bar)duringmeasurementare

indicativeofadefectivepump.

8

7

0

9

13

12

4

Nespresso Essenza C91 User Manual

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