Automatic Descaling - Saeco Classic Service Manual

4. FUNCTION/TIMING

5. Automatic descaling

Stage 1)
Solenoid valve EV1: Closed
Solenoid valve EV2: Open
Solenoid valve EV4: Open
55 pulses are generated via pump 1 and 55 pulses via pump 2.
Stage 2)
Solenoid valve EV1: Open
Solenoid valve EV2: Closed
Solenoid valve EV3: Open
30 water pulses are generated via pump 2.
Stage 3)
Solenoid valve EV1: Closed
Solenoid valve EV2: Open
One minute pause is allowed for the descaling solution to take effect. All solenoid valves,
EV1-2-3-4 are open to prevent an increased pressure in the water system caused by the descaling
solution.
All three processes are repeated several times automatically (about 45 minutes).
A final rinse with no descaling solution must be performed.
Page 8/22 REV.4 SEPT.2003
ROYAL
Saeco International Group