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ZUMA BREWER - OPERATION & SERVICE MANUAL
Important Information about Using a Zuma Brewer in Vista 2 Machines with D-Series
& G-Series Rear Boards
On newer Zuma brewers with a sealed breather vent on the front of the cylinder, you may
experience some cycle problems if installed in an older Vista 2 with a D-series or G-series rear
board. If a large cup of coffee is brewed on a newer Zuma brewer with a sealed breather vent,
liquid may remain in the cylinder as the brewer cycles back to the home position. After a few cups,
liquid may accumulate in the cylinder and cause inconsistent coffee levels and possibly cup
overflows. The sealed Zuma breather vent causes the brewed coffee to drain out of the cylinder
slower than the older non-modified Zuma brewer (prior to October 1997, without the plugged
breather vent), creating this situation. This may also apply to Vista 3 machines with very early NT1
software (prior to software version 2.6).
To use a Zuma brewer in Vista 2
with a D-series or G-series rear
board, you need to make the
following modifications.
1. Install a vent plug onto
the front of the brew
chamber.
The
number of the vent plug
is M014219.
2. Remove
the
silicone plug from the
vent hole on top of the
brewer cylinder.
3. Remove
the
silicone plug from the
front
of
the
cylinder, cut the depth of
the plug in half, and re-
install it.
This is not a problem on Vista NT2 equipment (with software version 4.3 or higher), as the piston
stops when it goes below the cylinder pour spout. This gives the liquid time to completely drain,
preventing any accumulation.
We recommend that you use the latest software versions for all NT or NT2 equipment. This
ensures that the equipment always uses the correct Zuma brewer cycle, as well as eliminates any
potential problems that may exist with earlier software versions.
Unfortunately, this extra 'pouring pause' feature designed specifically for the Zuma brewer cannot
be incorporated into D-series or G-series boards. However, if a non-modified Zuma brewer (without
a plugged breather vent) is used, the brewed coffee will drain from the cylinder more quickly,
reducing the chances of liquid accumulation. For this reason, we recommend that only Zuma
brewers that have not been modified be used in equipment with D-series and G-series rear boards.
Page 8 of 8
#
part
Remove, cut and re-install
plug in front of cylinder
existing
existing
brewer
0011
"
Remove existing plug
from vent hole
!
Install vent plug to
front of brew chamber
Zuma Brewer (N016352)
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