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26

FunctionTests

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

Checkingforleaksandpump

pressure(2)

Procedure(continued):

8. Switchonmachine.Presscoffeebutton

afterheatingup.

9. Openvalveandleavewatertorunoutfor

approx.10sec.

10. Fullyclosevalve.Thepressurewillrise

rapidlyinitiallyandstabilisebetween

1619bar(checkofpumppressure).

Thepressurewillriseslowlydueto

thetemperatureincrease.

Ifthepressureexceeds23bar,the

machinehastobeswitchedoffand

pressurereleasedthroughthepres

surevalve.

11. Performvisualandacousticchecksonall

pressurizedconnections.

Thepumpmustnotbeinoperation

forlo ngerthan50sec.withoutwater

flow.

12. Switchoffmachine.

13. Openvalvetoemptypressuregauge.

8

11

9

10

12

Nespresso Essenza C91 User Manual

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