How The Vki Zuma Brewer Works - VKI Technologies Zuma Brewer Operation And Service Manual

Zuma Brewer - Operation & Service Guide

How the VKI Zuma Brewer Works

When the cycle is started, the piston starts moving upwards, while the brew chamber moves down
(closing) to create a seal between the bottom of the chamber and the top of the cylinder.
Coffee, and then water, get dispensed into the brew chamber. The piston continues moving
upwards, forcing air through the coffee grounds and water. The agitation created by the forced air
mixes the coffee and water together, starting the extraction process.
Once the piston reaches its highest position, it pauses to allow more contact time between the
coffee grounds and water. This contact time increases the extraction from the coffee grounds.
The piston then starts moving downwards, creating a vacuum in the brewer cylinder. When it is
just above the pour spout area of the cylinder, the piston then pauses. This pause allows the
vacuum created in the cylinder to pull the liquid (brewed coffee) through the coffee grounds and
through the filter screen at the top of the cylinder.
The piston then moves down just below the pour spout area, dispensing brewed coffee into the
user's cup. At the same time, the brew chamber lifts and a rubber wiper moves from the right side
of the chamber, to the left side.
The brew chamber lowers slightly to bring the wiper onto the top surface of the cylinder and filter
screen. The wiper then moves across the top of the cylinder (and filter screen) wiping the used
coffee grounds off the right edge on the cylinder and into a waste container. The brewer then
moves back to the home (starting) position and is ready to repeat the process for the next user.
NOTE:
The maximum capacity of this brewer is approximately 325 ml (11 oz.). Do not attempt to exceed
this value as doing so may create flooding/overflow problems with the brewer.
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