Saeco Classic, Руководство по обслуживанию

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ROYAL 4. FUNCTION/TIMING
Saeco International Group REV.4 SEPT.2003 Page 7/22
Component Function
13 Sensor (KTY)
System 2 (steam)
Transmits current temperature value to electronic system
14 Thermostat
System 2 (steam)
Alternates current supply for heating system in event of
overheating.
15 Valve plug Opens when brewing unit is aligned with water circuit to
the unit itself.
16 Steam valve For steam dispensing
17 Valve (for cappuccino maker) Solenoid valve/steam dispensing for cappuccino
18 Valve (water) Solenoid valve for water dispensing
19 Valve (steam) Solenoid valve for steam dispensing (turbowater)
20 Valve (by-pass) Solenoid valve for water dispensing
1. General functioning
The electromagnetic valve
EV1
is a by-pass valve located between
pump 2
and
pump 1
. It must be
installed in the opposite direction to the flow.
When coffee and steam are dispensed simultaneously, a pressure difference exists between the two water
circuits (up to 12 bar for the water system as opposed to 4 bar for the steam system), which enables the
electromagnetic valve
EV1
to open.
In the event of a fault, very humid steam and inconsistent coffee quantities are obtained since the quantity of
water, determined by
Turbine 1
, does not completely reach the coffee/steam system.
2. Simultaneous coffee and steam dispensing
Solenoid valve
EV1
: Closed
Solenoid valve
EV2
: Open
Solenoid valve
EV3
: Closed
Solenoid valve
EV4
: Closed or open, depending on whether the steam is dispensed via the
Cappumore or the rotary valve.
Pump 1
functions for coffee production, while
pump 2
pulses the steam.
3. Simultaneous hot water and steam dispensing
Solenoid valve
EV1
: Closed
Solenoid valve
EV2
: Open
Solenoid valve
EV3
: Open
Solenoid valve
EV4
: Closed or open, depending on whether the steam is dispensed via the
Cappumore or the rotary valve.
Pump 1
functions for hot water production, while
pump 2
pulses the steam.
4. Dispensing only hot water
Solenoid valve
EV1
: Open
Solenoid valve
EV2
: Closed
Solenoid valve
EV3
: Open
Solenoid valve
EV4
: Closed
Pump 2
functions to produce hot water. This ensures that both pumps are regularly flushed with
water and no damage is caused by standing dry for too long.