period no cups have been detected the machine will display the “Out of
Cups” message.
N.B. An illustration showing the parts breakdown for the
Cup Drop Unit
is included in Section 13 - Spare Parts (see page 159).
7.7 Waste Level Probes
1. The waste level probes, fitted to the underside of the machine, detect the
water level in the waste tray.
2. The system consists of two springs set at different levels. When the water
level is high enough that both of the springs are immersed in the water a
message is displayed on the machine saying the waste tray is full and the
machine is disabled.
7.8 Brewer Unit (Freshbrew Machines)
The dual brewer unit provides both freshly brewed coffee and tea. The coffee and
tea ingredients are dispensed into the brewer unit via separate canisters.
A 24v DC, 3.5 RPM motor, controlled by an index cam fitted to the drive shaft,
operates the brewer unit. The cam operates a switch which sends a logic signal to
the controller when the brewer is in the correct position. The brewer motor will
timeout after 60 secs if the home switch is not seen.
Coffee Brewing
1. Water and coffee grounds are dispensed into the coffee brewing chamber.
The motor drives the piston up and mixes the coffee and water.
2. The motor drives the piston down and the resulting vacuum pulls filtered
coffee through the filter mesh. As the piston passes the coffee outlet
adaptor, coffee flows to the dispense head. The piston remains in this
position for a while to allow the coffee to drain away.
N.B. There are 4 programmable delay positions which can be set via the
freshbrew coffee selection timers. These delays are at zero by default but
could be increased to gain maximum extraction.
3. A separate mechanism removes the coffee grounds. The coffee wipe arm
wipes the grounds from the filter mesh. They then drop, via a deflector
tray, into a waste bucket. The motor returns the piston to its parked
position.
Tea Brewing
4. Water and tea are dispensed into the tea brewing chamber. The brewer
stays shut until the required amount of water has passed through the
system. When the tea chamber is empty, the motor operates the wiper
arm and the used tea cake is removed from the tea filter mesh.
Technical Manual
80
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