Saeco Cappuccino, Service Manual

Page: 54 / 143

4. FUNCTION/TIMING ROYAL
Page 8/22 REV.4 SEPT.2003 Saeco International Group
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.