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Technical Manual
Pressure Boiler
The pressure boiler has a capacity of 17 fl oz and is fitted with a 1.1kW heating element.
Cold water is diffused as it enters the boiler and heated water exits the boiler through the
top coupling. A resettable temperature cut-out is mounted externally on the front of the
boiler as a safety feature. A thermistor is mounted in the top of the boiler to measure
water temperature.
3 Way Valve (Espresso Valve)
Supplies heated water to the CoEx® brewer when an espresso or freshbrew drink has been
selected.
2 Way Valve (Pressure Valve)
This valve is normally open exposing the system to the 3 bar mechanical relief valve. It is
closed during vends to allow higher pressures to be achieved within the system.
Relief Valve - 3 Bar (Mechanical)
The 3 bar pressure valve is a mechanical safety valve. The valve allows for heat expansion
while the machine is in stand-by mode.
By-pass Valve - 12 Bar (Mechanical)
The 12 bar valve is a mechanical safety valve. The valve activates and sends water to the
waste tray if the system pressure exceeds 12bar.
Non Return Valve
The non return valve allows water to flow in one direction which smooths the flow which
allows accurate reading of the flow meter.
Grinder Mechanism (Not Shown On Water Flow Diagram)
The grind mechanism consists of a 110V AC conical grinder with a manual adjustment.
When an espresso based drink is selected the grinder will run for the programmed time
grinding beans and feeding the brewer. The grinder is fitted with a manual adjusting
mechanism which allows the engineer to vary the grind of the coffee in order to satisfy
consumers' taste preferences.
CoEx® Brewer (Not Shown On Water Flow Diagram)
The brewer unit is capable of receiving between 5 and 9 grams of ground coffee. Once the
coffee has been ground and dispensed into the brewer unit the 24Vdc brewer motor drives
the brewer to the vend position using current sensing as it's control. The coffee is
compressed into a cake and water is pumped through the brewer. When the required
amount of water has passed through the brewer the now wet coffee cake is squeezed,
removing most of the water from the cake and preventing the brewer becoming
unnecessarily dirty. After the cake has been squeezed the brewer will deposit the cake into
the dry waste container and via a position signal from a micro switch make a timed return
to the stand-by position.
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