Technical Information
36
CVA 4062/CVA 4066/CVA 4068 Coffee Systems
2 Function
2.1 Brew Unit Control
Coffee is dispensed into the hopper of the brew unit by the grinder operation. The
brew unit drive motor is energized and the brew unit drives toward the “brew” position;
the ground coffee is compressed between the filters. Once the brew unit position
switch is actuated, power to the brew unit drive motor is interrupted. Hot water is
pumped into the brew unit, which passes through the filters, mixes with the grounds,
and then exits the brew unit as coffee. The brew unit drive motor is now energized in
the reverse position. This drives the brew unit back toward the home position. The
compressed used grounds are dumped as pucks into the waste container. Once the
brew unit home switch is actuated, power to the brew unit drive motor is interrupted.
2.1.1 Microswitch Locations
The brew unit is controlled by 4 microswitches (Figure 030-1).
The drive system and actuator disk are in the neutral position when the left-hand
actuator of the double cam is activating the upper microswitch (Figure 030-1, Item 3).
This is the initial default position of the brew unit.
When the brew unit is correctly installed, the brew unit present microswitch (Figure
030-1, Item 2) is activated.
After the brew unit has been activated, if one of the two positioning microswitches
(Figure 030-1, Item 3 or 4) has not switched within approximately 10 seconds, fault
F73 will be indicated (see Section 070-3.11).
Figure 030-1: Brew Unit Microswitches
2.1.2 Electronic Grind Amount Compensation
The grind amount compensation balances out variations in grinder settings and coffee
types. The grind amount can be set in the customer programming mode for the various
coffee types (coffee, espresso, cappuccino). The setting range is divided into levels 1
1 Grind amount compensation
microswitch (S51/4)
2 Brew unit present monitoring
microswitch (S87/2)
3 Top position control (home
setting) microswitch (S60/1)
4 Bottom position control
(compressing and drain position)
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