Chapter 3 Functional descriptions
SMSO-2-02.03- 15.07.03 55
Flush system
The flush system is used to compensate for the heat loss
from the coffee. If no coffee is served for 60 seconds, the
water pipe system (pipes and valves) between the hot water
unit and the brewing unit connection are pre-heated with hot
water before the brewing process.
To prevent the hot water from reaching the brewing unit, an
injector nozzle is installed inside the T-piece. The flush valve
downstream is open when at zero current, and the rinsing
water runs into the drip tray. After the flushing operation,
which lasts three seconds, the flush valve closes and the
water now runs into the brewing unit. After the brewing proc-
ess the flush valve opens again, so that the excess water can
flow again when the coffee grounds are repressed.
Additional water (bypass)
This system is used to produce a light-coloured coffee as pre-
pared for, among other things, coffee that is to have an injec-
tion of a spirit added to it. A proportion of the programmed total
quantity of brewing water is bypassed to the brewing unit in
order to dilute the strongly brewed coffee. This water is di-
verted from the instant heater outlet with a separate 2/2 way
valve, and is sent at the brewing unit outlet into the outlet pipe.
The bypass valve is closed at zero current.
1 Open brewing valve
2 Flush valve closes after 3 seconds, then water
flows through the brewing unit
3 The brewing valve closes, the flush valve opens
1 Number of pulses from the flowmeter (=”time”) quantity
dosing.
2 Quantity output
3 Bypass opens, dosing takes place according to number of
pulses.
4 Bypass is closed, the rest of the programmed quantity
runs through the brewing unit.
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