VKI Technologies Zuma Brewer Manuale operativo

Page 1 of 8 November 24, 2000 p/n – N016352

Zuma

Brewer

Operation and Service Manual

ZUMA BREWER - OPERATION & SERVICE MANUAL

Page 2 of 8 0011 Zuma Brewer (N016352)

OPERATING GUIDELINES

NOTE: The maximum capacity of this brewer is approximately 325 ml (11 oz.). Do not attempt to

exceed this value. Doing so may create flooding/overflow problems with the brewer.

There are certain operating guidelines and preventative maintenance procedures that must be

followed to ensure the Zuma brewer functions properly and efficiently. These guidelines and

procedures are listed below, and are also detailed in this guide. It is important that you read this

guide to familiarize yourself with this brewer and these procedures.

•Over time, coffee oils and fine grounds (the size of dust particles) as well as minerals in the

water will accumulate on the brewer screen assembly. This accumulation will decrease the

porosity of the screen, resulting in brewer flooding. The Zuma brewer screen must be kept

clean to prevent this from occurring.

•The correct removal and installation procedure for the brew chamber is crucial. Although the

assembly can be easily removed for cleaning (by lifting up the latch bar in front of the

chamber), the re-installation requires some precision. The wiper assembly on the chamber

must be inserted between the two stainless steel arms located at the rear of the brewer. These

two arms can be easily located once the brew chamber assembly is removed. Failure to

properly align the brew chamber during installation may result in excessive brewer

damage.

•If a leak develops between the top of the brewer cylinder and the bottom of the brew chamber,

it may be necessary to add small metal shims onto the H-frame to correctly seal the brewer.

•To properly clean and de-stain the brewer without damaging the components, rinse the brewer

using only a VKI approved brewer cleaner. The use of any other types of cleaning agents may

cause damage to plastic and rubber components on the brewer.

•Never, under any circumstances, turn the Zuma brewer in a backwards direction. Doing

so will damage the bearings on the cam.

Lift Latch and Pull

Brew Chamber

Towards You

ZUMA BREWER - OPERATION & SERVICE MANUAL

Zuma Brewer (N016352) 0009 Page 3

The following describes some of the general maintenance procedures that must be followed to

keep the Zuma brewer functioning properly at all times. All of these procedures are simple and can

be done in just minutes.

BREW CHAMBER TENSION ADJUSTMENT

During a brew cycle, if a leak develops between the brew chamber and the screen assembly, some

minor adjustments may be required. This leaking is an indication that the brew chamber is not

closing tightly enough.

If this is the case, the following procedure should

be performed,

1. Press the red “LOAD FILTER TAPE” button

to open the brewer, and remove the

brew chamber by lifting the latch bar

and pulling it towards you.

2. Push down on the H-frame, and lift the

vertical rod (T-bar) out of its recession.

3. Add a stainless steel Zuma brewer shim

(full shim - K011950 or half-shim - K011191)

into the recession, and re-insert the T-

bar.

4. Re-install the brew chamber and test

the brewer by making several cups of

coffee.

NOTE: In most cases, this simple procedure is enough to stop the leaking. However, if the brewer

still leaks at this point, repeat the above procedure and add one more shim. If the problem

is still not corrected, remove all the stainless steel shims, turn the T-bar one complete

rotation clockwise, then re-insert it into the recession on the h-frame.

CAUTION: Do not over-tighten the T-bar as too much pressure will cause damage to

the brewer. If wiper blade throws the coffee patty against the side of the

machine, the T-bar is too tight.

ZUMA BREWER - OPERATION & SERVICE MANUAL

Page 4 of 8 0011 Zuma Brewer (N016352)

ZUMA BREWER SCREEN ASSEMBLY MAINTENANCE

Screen Assembly Extractor Tool

The screen assembly on the Zuma brewer can be very easily removed for cleaning or replacement

with a special screen extraction tool to properly do this. The part number of the Zuma Screen

Extractor Tool is K023029.

Zuma Screen Extractor Tool

Removing the Brewer Screen Assembly

The following describes the correct procedure for removing the Zuma brewer screen assembly. It is

recommended you remove the brewer from the machine to remove the screen assembly. Once the

screen is removed, it should be thoroughly cleaned before it is re-installed.

1. Press the red <LOAD FILTER TAPE> button on the control panel to open the brewer.

2. Remove the brewer from the machine.

3. Remove the brew chamber assembly by lifting the latch bar and pulling the brew

chamber towards you.

4. Insert the Zuma screen extractor tool through the pour spout with the tip pointing

upwards (as illustrated in the diagram on the following page).

5. Gently push the extractor tool against the rear of the cylinder and slide it up until contact

is made with the screen assembly frame.

6. With the tool, push up on the bottom, rear center of the screen assembly to remove the

screen. Please note that some pressure will be required to pop the screen assembly

loose.

ZUMA BREWER - OPERATION & SERVICE MANUAL

Zuma Brewer (N016352) 0009 Page 5

Cleaning the Brewer Screen Assembly

The Zuma brewer filter screen needs to be cleaned periodically to allow liquid to easily flow

through it. Over time, coffee dust, oils and minerals from the water will accumulate on the screen

making it less porous, eventually resulting in brewer flooding. It is recommended that the screen be

cleaned every 1000-2000 cups, even if it appears to be working properly.

Using the Zuma screen extractor tool, remove the screen from the brewer to clean it. We

recommend soaking the screen in a solution of one part bleach to ten parts water for a

maximum of 30 minutes, as prolonged contact with bleach may damage the screen assembly.

Once this is done, the screen should then be thoroughly rinsed with dish soap and warm water to

remove any leftover residue.

NOTE: Periodically performing an automated brewer rinse cycle is still required to clean the brewer

screen as well as other brewer components.

ZUMA BREWER - OPERATION & SERVICE MANUAL

Page 6 of 8 0011 Zuma Brewer (N016352)

Installing the Screen Assembly

1. Line up the screen assembly in the recession on top of the brewer cylinder. Make certain that

the bump on one of the sides of the screen assembly is pointing to the rear of the brewer

cylinder.

NOTE: The screen has to be inserted in a particular way. There are clips on each end of the

screen assembly. These clips must be pointing downwards, and to the right and left sides

of the cylinder. If they do not, the screen assembly cannot be locked in place.

Zuma Brewer Screen Assembly

2. With the clips properly lined up, push down on the screen assembly until it locks in place.

3. Re-install the brew chamber in the brewer. Make certain that the wiper assembly is inserted

between the two stainless steel arms at the rear of the brewer.

4. Re-install the brewer into the machine.

Bump Goes Towards the

Rear of the Cylinder

Clips on Sides of

Screen Assembly

ZUMA BREWER - OPERATION & SERVICE MANUAL

Zuma Brewer (N016352) 0009 Page 7

Using the Brewer Rinse Cycle

The Vista 2/3 is equipped with a rinse cycle for both the brewer and the chocolate components.

This automated feature allows for simple periodic cleaning of these components. To access the

rinse cycles, press the "RINSE CYCLE" button on the control panel inside the door and the following

message will appear on the display,

At this point, the words "CHOCO.” and "COFFEE" will flash, alternating from one to the other. This is

to advise you that it will be necessary to select the type of rinse that is required. To rinse the

brewer, press the "COFFEE" button on the front selection panel.

WARNING: Before proceeding with the rinse cycle, a waterproof container

must be placed below the pour spouts as rinse water will be dispensed from

these spouts.

To rinse the brewer:

1. Add VKI approved brewer cleaner to the brew chamber and activate the brewer rinse cycle by

pressing the "RINSE CYCLE" button on the control panel inside the front door.

NOTE: To cancel the rinse cycle if it was pressed accidentally, press any button (except the

“START” button) on the front selection panel. This will exit the rinse cycle and return the unit

to the “standby” mode.

a) It will now be necessary to select the type of rinse cycle required. For a brewer rinse,

press the "COFFEE" button on the front selection panel to begin the cycle.

b) The piston will now move to the top of the cylinder, water will pour in, and the brewer

will pause for about 5 minutes. During this time, the cleaner will break down all the oils

and stains that have accumulated on the brewer.

NOTE: To cancel the five-minute pause and proceed to the seven rinse cycles, press the “START”

button. For proper brewer cleaning, it is recommended that the full cycle be performed.

c) After the 5 minutes have elapsed, the brewer will cycle, dumping the cleaner into the

waste container in the process. The brewer will then automatically cycle water seven

consecutive times to rinse the cleaner from the brewer. After the rinse cycle is

completed, the brewer will stop and the machine will automatically exit the rinse mode.

NOTE: To cancel the seven rinse cycles, press the “START” button. For proper brewer cleaning, it

is recommended that the full cycle be performed.

d) After the rinse cycle is complete, brew a few cups of coffee to re-lubricate the brewer.

RINSE CYCLE

CHOCO. OR COFFEE

ZUMA BREWER - OPERATION & SERVICE MANUAL

Page 8 of 8 0011 Zuma Brewer (N016352)

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 part

number of the vent plug

is M014219.

2. Remove the existing

silicone plug from the

vent hole on top of the

brewer cylinder.

3. Remove the existing

silicone plug from the

front of the brewer

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.

!Install vent plug to

front of brew chamber

"Remove existing plug

from vent hole

#Remove, cut and re-install

plug in front of cylinder

Zuma – Adjusting & Handling (N016568) December 4, 2001 Page 1

Zuma Brewer Adjusting and Handling Procedures

For the past few weeks, we have been analyzing the Zuma brewers that have been returned to us for

repair. The majority of these brewer were received with damaged bearings and vertical rod housings. Our

analysis indicates that in most cases, too much tension was placed on the brew chambers. When the

chambers are overtightened, there is too much pressure placed on both the bearings and the vertical rod

housings, resulting in damage to these components.

This document was created to guide you through the adjusting and handling procedures that are essential

for keeping the Zuma brewers operating efficiently. Following these procedures will reduce the risk of

damage to the brewers.

It is imperative that this information be shared with all your service staff.

Please post this document in an area that is accessible to everyone.

Brew Chamber Tension Adjustment

•When adjusting the tension on the brewer, add full shims (K011950) or half shims (K011191

between the T-bar and the H-frame, as illustrated below. These shims must be added one at a

time. Do not add several shims at once as the tension may be increased too much.

In most cases, this simple procedure is enough to stop the leaking. However, if the brewer still

leaks at this point, repeat the procedure and add one more shim (start with one half shim – if

that’s not enough, remove the half shim and add one full shim).

•Turning the T-bar should be avoided and should only be done as a last resort. If the brewer

tension is still too loose after installing two full shims, remove the two shims and only once they

are removed should you turn the T-bar one rotation clockwise.

•If the wiper is hitting the coffee paddy as it moves towards the left, this indicates that the brew

chamber is not rising high enough. Either something is interfering with the upward motion of the

chamber, or the chamber tension is too tight.

•If the tension is adjusted properly and the brewer is flooding, do not tighten the brew chamber

even more. Increase the bottom pause, lower the water temperature or replace the filter screen. If

the problem persists, check the brewer to make certain there is no loss of vacuum, usually caused

by a cracked brew chamber or cylinder, a worn or scored cylinder, or a worn Teflon seal.

Zuma – Adjusting & Handling (N016568) December 4, 2001 Page 2

Brew Chamber Installation

•The correct removal and installation procedure for the brew chamber is crucial. Although the assembly

can be easily removed for cleaning (by lifting up the latch bar in front of the chamber), the re-

installation requires some precision. The wiper assembly on the chamber must be inserted between

the two stainless steel arms located at the rear of the brewer. These two arms can be easily located

once the brew chamber assembly is removed. Failure to properly align the brew chamber during

installation may result in excessive brewer damage.

•When re-installing the brew chamber, make certain it is properly locked in position. Gently grip the

top of the brew chamber (not the release latch) and pull it slightly. If it is not properly locked in

place, you will be able to pull it out. Failure to lock the brew chamber in place will result in the

chamber moving forwards, and then coming down on top of the plastic cylinder lip in front

of the filter screen. This can damage the brew chamber, cylinder, the arms and bearings and/or

the vertical rod housing.

General Maintenance and Adjustments

•Never turn the brewer backwards. This will damage the arms and bearings and possibly the

cam.

•Use only the VKI designed screen extraction tool (illustrated below) to remove the re-useable filter

screen. The use of any other tools will damage the brewer.

•When performing a brewer rinse, use only VKI approved powder cleaner. Any other chemicals

or detergents may damage the brewer. Do not, under any circumstances, soak the brewer’s

plastic parts in brewer cleaner for prolonged periods of time (maximum is 30 minutes).

Lift Latch and Pull

Brew Chamber

Towards You

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