28
Repair
Service Manual EF 473 / EF 474 enVersion 1.0
Measuring flow rate
Procedure:
1. Fill water tank.
2. Insert pressure plug in capsule inlet.
3. Press down closing handle lightly till
pressure plug fits in capsule cage.
4. Pull off holding device. The pressure plug
clamps itself to the capsule cage.
5. Position measuring beaker underneath
exit tube of pressure plug.
6. Switch on machine.
7. Press button "large cup" after heating-up.
8. Open valve fully till water begins to flow.
9. Close valve until 12 bar are indicated.
)
The manometer must be observed
continuously and the pressure
regulated using the valve if
necessary. With increasing
temperature the pressure also
increases, if necessary readjust the
pressure to 12 bar.
10. Perform measurement for approx. 30 sec.
11. 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.
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