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Section 8 - Espresso System
Espresso machines are capable of producing high quality espresso based drinks through the
CoEx® brewer unit. The machine will also vend high quality freshbrew coffee from pre-
ground product.
8.1 Example Vend
When an Espresso drink is selected the following sequence occurs:
1.
The consumer selects an espresso drink. Fresh beans are delivered into the grinder
and the grinder is operated for a pre-determined time. Ground coffee is deposited
into the CoEx® brewer.
2.
The brewer moves to the vend position. The brewer motor starts running clockwise
causing the filter assembly to cover the piston chamber and the piston to move
upwards forming the ground coffee into a compressed cake as it does so.
3.
When the heater reaches the correct temperature the inlet valve is opened and the
2 way valve closed. The pump will start pumping water through the system and into
the brewer.
4.
Whilst water is passing through the system a water flow meter will send pulses back
to the main controller and the espresso selection will be delivered into the cup.
5.
Once the required amount of water has been pumped through the system the inlet
valve closes and the pumps stop pumping water through the system. The brewer
compresses the used coffee cake, the two way valve is opened and the three way
valve switched off.
6.
The brewer motor reverses and drives the piston back up to the top of the chamber.
The wiper mechanism ejects the used coffee cake into the dry waste container and
the brewer piston moves back to the stand-by position.
8.2 System Overview
Important: The machine must be operated in conjunction with a water filter of food
grade quality. The filter must be capable of removing temporary hardness (scale), heavy
metals (lead, copper, iron, cadmium), chlorine and any organic pollutants/discolouration.
Water Inlet Valve
A 24V DC solenoid water inlet valve. When a drink is selected the inlet valve is opened
and at the same time the pump is operated pumping water through the system.
Reducing Valve
An inline reducing valve that maintains water pressure entering the system at 0.9 bar.
Flow Meter
As water flows through the system the flow meter sends pulses back to the control
board.
Vibration Pump - 110V AC
When a drink is selected the pump switches on at the appropriate moment and will run
until the required amount of water has been pumped through the system.
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