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52
F I N A L T E S T I N G
Start pressure test
11. Close pressure control valve (A) to
reach 8 bar (+/0.5 bar).
Test is passed if
flow rate is between 95 to 145 ml within 30 sec (190 290 ml/min)
water temperature is between 80 °C to 90 °C (176 °F to 194 °F).
Maximal pressure / leakage check
Continue with existing test setup:
1. Close pressure control valve (A)
completely.
The coffee machine remains
switched ON.
Test is passed if
maximal pressure is between 12 to 15 bars
pressure drop is less than 1.5 bars within 30 sec
no water is leaking (extraction head, housing bottom etc.).
Service manual
12. Check flow rate at 8 bar during
30 sec.
13. Hold temperature sensor approx.
3 mm under control valve and
measure hot water temperature.
14. Continue with maximal pressure test.
3. Watch pressure gauge for 15 sec.
4. Release the pressure by opening the
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