Bunn CEZ-APS, CDBC-APS, CEZ-TSR, CDBC-TSR, CDBC-TS User Manual

BUNN

®

CEZ-APS, CDBC-APS,

CEZ-TS, CDBC-TS,

CEZ-TSR, CDBC-TSR

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OPERATING & SERVICE MANUAL

BUNN-O-MATIC CORPORATION

POST OFFICE BOX 3227

SPRINGFIELD, ILLINOIS 62708-3227

PHONE: [phone] FAX: [phone]

www.bunnomatic.com

INTRODUCTION

This equipment will automatically brew a half-gallon batch of coffee into an awaiting server at the press of a
button. A hot water faucet may be included for allied beverage use. Most functions of the brewer are digitally
controlled. It is only for indoor use on a sturdy counter or shelf.

CONTENTS

Introduction & Warranty .................................................................................... 2

User Notices ...................................................................................................... 3

Electrical & Plumbing Requirements ................................................................. 4

Operating Controls............................................................................................. 5

Initial Set-Up, Coffee Brewing, & Cleaning......................................................... 6

CEZ-APS/TS/TSR Adjustments & Optional Settings .......................................... 7

CDBC-APS/TS/TSR Adjustments & Optional Settings ....................................... 8

Troubleshooting................................................................................................. 9

Service............................................................................................................. 20

Wiring Diagrams.............................................................................................. 31

WARRANTY

Bunn-O-Matic Corp. (“Bunn”) warrants the equipment manufactured by it to be commercially free from defects
in material and workmanship existing at the time of manufacture and appearing within one year from the date of
installation. In addition:

1.) Bunn warrants electronic circuit and/or control boards to be commercially free from defects in material and

workmanship for two years from the date of installation.

2.) Bunn warrants the compressor on refrigeration equipment to be commercially free from defects in material

and workmanship for two years from the date of installation.

3.) Bunn warrants that the grinding burrs on coffee grinding equipment will grind coffee to meet original factory

screen sieve analysis for three years from date of installation or for 30,000 pounds of coffee, whichever comes first.

This warranty does not apply to any equipment, component or part that was not manufactured by Bunn or that,
in Bunn’s judgement, has been affected by misuse, neglect, alteration, improper installation or operation, improper
maintenance or repair, damage or casualty.

THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARRANTY, WRITTEN OR
ORAL, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF EITHER
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. The agents, dealers or employees of Bunn are

not authorized to make modifications to this warranty or to make additional warranties that are binding on Bunn.
Accordingly, statements by such individuals, whether oral or written, do not constitute warranties and should not
be relied upon.

The Buyer shall give Bunn prompt notice of any claim to be made under this warranty by telephone at (217)
529-6601 or by writing to Post Office Box 3227, Springfield, Illinois, 62708-3227. If requested by Bunn, the Buyer
shall ship the defective equipment prepaid to an authorized Bunn service location. If Bunn determines, in its sole
discretion, that the equipment does not conform to the warranty, Bunn shall repair the equipment with no charge
for parts during the warranty period and no charge for labor by a Bunn Authorized Service Representative during
the warranty period. If Bunn determines that repair is not feasible, Bunn shall, at its sole option, replace the
equipment or refund the purchase price for the equipment.

THE BUYER’S REMEDY AGAINST BUNN FOR THE BREACH OF ANY OBLIGATION ARISING OUT OF THE SALE
OF THIS EQUIPMENT, WHETHER DERIVED FROM WARRANTY OR OTHERWISE, SHALL BE LIMITED, AS
SPECIFIED HEREIN, TO REPAIR OR, AT BUNN’S SOLE OPTION, REPLACEMENT OR REFUND.

In no event shall Bunn be liable for any other damage or loss, including, but not limited to, lost profits, lost sales,
loss of use of equipment, claims of Buyer’s customers, cost of capital, cost of down time, cost of substitute
equipment, facilities or services, or any other special, incidental or consequential damages.

Page 2

29253 030101

USER NOTICES

Carefully read and follow all notices in this manual and on the equipment. All labels on the equipment should

be kept in good condition. Replace any unreadable or damaged labels.

Page 3

ELECTRICAL REQUIREMENTS

CAUTION - The brewer must be disconnected from the power source until specified in

Model 15 has an attached cordset and requires 2-wire grounded service rated 120 volts ac, 15 amp, single

phase, 60 Hz.

Initial Set-Up.

WHITE

NEUTRAL
L1 BLACK

120V.A.C.

Model 20 requires 2-wire, grounded service rated
120 volts ac, 20 amp, single phase, 60 Hz. Proceed as
follows:

Model 35 requires 3-wire, grounded service rated

120/208 or 120/240 volts ac, 20 amp, single phase, 60
Hz. Proceed as follows:

L2 RED

WHITE

NEUTRAL

L1 BLACK

120V.A.C.

208 or 240V.A.C.

120V.A.C.

Electrical Hook-Up
CAUTION – Improper electrical installation will damage electronic components.

1. An electrician must provide electrical service as specified.

2. Using a voltmeter, check the voltage and color coding of each conductor at the electrical source.

3. Remove the front panel beneath the sprayhead.

4. Feed the cord through the strain relief and connect it to the terminal block.

5. Connect the brewer to the power source and verify the voltage at the terminal block before proceeding.

Replace the front panel.

6. If plumbing is to be hooked up later be sure the brewer is disconnected from the power source. If plumbing

has been hooked up, the brewer is ready for Initial Set-Up.

PLUMBING REQUIREMENTS

These brewers must be connected to a cold water system with operating pressure between 20 and 90 psi (138
and 620 kPa) from a 1⁄2" or larger supply line. A shut-off valve should be installed in the line before the brewer. Install
a regulator in the line when pressure is greater than 90 psi (620 kPa) to reduce it to 50 psi (345 kPa). The water
inlet fitting is 1⁄4" flare. Bunn-O-Matic does not recommend the use of a reverse-osmosis or deionized water supply
to this equipment.

NOTE - Bunn-O-Matic recommends 1⁄4" copper tubing for installations of less than 25 feet and 3⁄8" for more than
25 feet from the 1⁄2" water supply line. A tight coil of copper tubing in the water line will facilitate moving the brewer
to clean the countertop. Bunn-O-Matic does not recommend the use of a saddle valve to install the brewer. The
size and shape of the hole made in the supply line by this type of device may restrict water flow.

This equipment must be installed to comply with the Basic Plumbing Code of the

Building Officials and Code Administrators International, Inc. (BOCA)

and the Food Service Sanitation Manual of the Food and Drug Administration (FDA).

Plumbing Hook-Up

1. Flush the water line.

2. Securely attach it to the flare fitting at the rear of the brewer.

3. Turn on the water supply.

Page 4

29253 011900

OPERATING CONTROLS

Model CEZ-APS/TS/TSR

ON/OFF SWITCH

Placing the "ON/OFF" switch in the "ON" upper position enables the
brew circuit, and energizes the tank refill circuit. Placing the switch
in the "OFF" lower position stops tank refilling and brewing. Stop­ping a brew cycle after it has been started will not stop the flow of
water into the server until the funnel is empty.

NOTE – Hot water will be available at the faucet in a limited amount

P1910

when the switch is in the "OFF" position because the tank will not
refill.

BREW SWITCH

Momentarily pressing and releasing the switch starts a brew cycle when the "ON/OFF" switch is in the "ON" upper

position.

NOTE – The "ON/OFF" switch must be in the "ON" upper position to initiate and complete a brew cycle.

READY INDICATOR

This indicator glows when the preselected brew water temperature has been achieved.

Model CDBC-APS/TS/TSR

ON/OFF SWITCH

Pressing the "ON/OFF" switch (indicator glowing) enables the brew
circuit and energizes the tank refill circuit. Pressing the switch again
(indicator not glowing) stops tank refilling and brewing. Stopping a
brew cycle after it has been started will not stop the flow of water into
the server until the funnel is empty.

NOTE – Hot water will be available at the faucet in a limited amount
when the "ON/OFF" indicator is not glowing because the tank will not

P1911

refill.

BREW SWITCH

Momentarily pressing and releasing the switch starts a brew cycle when the "ON/OFF" indicator is glowing.

NOTE – The "ON/OFF" indicator must be glowing to initiate and complete a brew cycle.

READY INDICATOR

This indicator glows when the preset temperature has been achieved. The word "NOT" above "READY" will glow

in all other instances.

TEMPERATURE INDICATORS (Feature disabled from the factory – refer to page 8.)

The indicator glows to communicate the brew water temperature. Two indicators will glow when the

temperature is between them.

Page 5

INITIAL SET-UP

1. Insert an empty funnel into the funnel rails.

2. Place an empty server under the funnel.

3. Connect the brewer to the power source.

4. Model CDBC-APS/TS/TSR – Press the "ON/OFF" switch (indicator glowing).

Model CEZ-APS/TS/TSR – Place the "ON/OFF" switch in the "ON" upper position.

5. Water will flow into the tank and stop when the tank is filled to its capacity.

6. Wait approximately twenty minutes for the water in the tank to heat to the proper temperature.

7. Place a small vessel beneath the faucet and open the faucet handle. Release it when you hear the tank refilling.

8. Model CDBC-APS/TS/TSR – Press the "ON/OFF" switch (indicator glowing) then momentarily press and

release the "BREW" switch.
Model CEZ-APS/TS/TSR – Place the "ON/OFF" switch in the "ON" upper position then momentarily press and
release the "BREW" switch.

9. Allow the cycle to finish and measure the amount of water in the server. It should be 64 ounces ± 2. Refer

to the adjustments section of this manual should the volume need to be increased or decreased.

The brewer is now ready for use in accordance with the coffee brewing instructions below.

COFFEE BREWING

1. Insert a BUNN® filter into the funnel.

2. Pour the fresh coffee into the filter and level the bed of grounds by gently shaking.

3. Slide the funnel into the funnel rails.

4. Place an empty server beneath the funnel.

5. Model CDBC-APS/TS/TSR – Press the "ON/OFF" switch (indicator glowing) then momentarily press and

release the "BREW" switch.
Model CEZ-APS/TS/TSR – Place the "ON/OFF" switch in the "ON" upper position then momentarily press and
release the "BREW" switch.

6. When brewing is completed, simply discard the grounds and filter.

CLEANING

1. The use of a damp cloth rinsed in any mild, non-abrasive, liquid detergent is recommended for cleaning all

surfaces on Bunn-O-Matic equipment.

2. Check and clean the sprayhead. The sprayhead holes must always remain open.

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29253 071599

CEZ-APS/TS/TSR ADJUSTMENTS & OPTIONAL SETTINGS

Page 7

CDBC-APS/TS/TSR ADJUSTMENTS & OPTIONAL SETTINGS

P1912

Setting Brew Temperature

The brewer is factory set to brew at 200°F(95°C). To change this setting, press and hold the "HIDDEN" switch
beneath the "®". The word "TEMP" above the "ON/OFF" switch will glow to correspond with the temporary function
change of this switch. Repeatedly press and release the "ON/OFF" switch until one of the bank of temperature
indicators shows the approximate desired temperature. When two indicators are glowing, the temperature is
approximately the number between them.

Displaying Brew Temperature

The brewer is factory set with the temperature display disabled. To change this setting, press and hold the "ON/
OFF" switch and the "HIDDEN" switch beneath the "®" for five seconds, the entire bank of temperature indicators
will glow. Release both switches. Pressing and releasing the "ON/OFF" switch will toggle between turning the entire
bank of temperature indicators on-or-off, signifying the "ON" or "OFF" condition of this display. Wait for a few
seconds, the brewer will maintain this last setting.

Setting Brew Lockout

The brewer is factory set with the brew lockout disabled. Brew lockout prevents starting a brew cycle if the ready
indicator is not glowing. When an attempt at brewing cannot be allowed, the word "NOT" and "LOCKOUT" flash for
three seconds to indicate the reason the brew can't begin. To change the condition of the brew lockout, press and
hold the "HIDDEN" switch beneath the "®" and momentarily press the "BREW" switch.

IMPORTANT: The tank must be full and fill solenoid shut off prior to making these adjustments.

Adjusting Brew Volumes

The brewer is factory set to deliver 64 ounces ± 2 for each brew cycle.
BREW VOLUME SET-UP: Use the following steps when the setting is unknown or a different circuit board is being
installed.

1. Place an empty funnel in the funnel rails and an empty server or graduated vessel beneath the funnel.

2. Place the "ON/OFF" switch in the "ON", upper position.

3. Press and hold the brew start button until you hear the brew solenoid click on-and-off three times

(approximately 5 seconds). Release the button.

4. Allow the cycle to continue until the desired amount of water is dispensed and then turn "OFF" the brewer.
The brewer is now set to dispense this amount of water for each subsequent brew cycle.

To increase the amount of water for each brew cycle place an empty funnel in the funnel rails and an empty
server or graduated vessel beneath the funnel. Press the "ON/OFF" switch. Press and hold the "BREW" switch until
you hear the solenoid click on-and-off three times (approximately 5 seconds), then release the "BREW" switch.
Momentarily press and release the "BREW" switch once for each ounce (approximate) of water to be added to the
prior setting and allow the brew cycle to finish.

To decrease the amount of water for each brew cycle place an empty funnel in the funnel rails and an empty
server or graduated vessel beneath the funnel. Press the "ON/OFF" switch. Momentarily press and release the
"BREW" switch once for each ounce (approximate) of water to be removed from the existing setting. Press and
hold the "BREW" switch until you hear the solenoid click on-and-off three times (approximately 5 seconds), then
release the "BREW" switch and allow the cycle to finish.

Page 8

29253 030101

TROUBLESHOOTING

A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems
encountered. If the problem remains after exhausting the troubleshooting steps, contact the Bunn-O-Matic
Technical Service Department.

• Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel.

• All electronic components have 120 volt ac and low voltage dc potential on their terminals. Shorting of

terminals or the application of external voltages may result in board failure.

• Intermittent operation of electronic circuit boards is unlikely. Board failure will normally be permanent. If an

intermittent condition is encountered, the cause will likely be a switch contact or a loose connection at a

terminal or crimp.

• Solenoid removal requires interrupting the water supply to the valve. Damage may result if solenoids are

energized for more than ten minutes without a supply of water.

• The use of two wrenches is recommended whenever plumbing fittings are tightened or loosened. This will help

to avoid twists and kinks in the tubing.

• Make certain that all plumbing connections are sealed and electrical connections tight and isolated.

• This brewer is heated at all times. Keep away from combustibles.

WARNING – • Exercise extreme caution when servicing electrical equipment.

• Unplug the brewer when servicing, except when electrical tests are specified.

• Follow recommended service procedures.

• Replace all protective shields or safety notices.

Before troubleshooting this brewer, check for the following:

A. Control Boards (CDBC-APS/TS/TSR)

1. Make sure ribbon cable is properly attached to the control board (ALL PINS INSERTED INTO PLUG).

2. Make sure there is a nylon insulating washer under each screw head that holds the control board to the plastic
front end cap. This is important for proper operation.

B. Control Boards (CEZ-APS/TS/TSR)

Locate J6 connector on control board. If jumper is across pins 1 & 2, board is set up to operate tea brewer or
a brewer that DOES NOT use a water level probe. If jumper is across pins 2 & 3, board is set up to operate a
coffee brewer or a brewer that uses a water level probe. Look at the bottom side of the control board. Pin 1 of
connector J6 is marked by a square solder pad on the foil side of the board and pins 2,3 & 4 are marked by a
round solder pad.

C. Control Boards (CDBC-APS/TS/TSR & CEZ-APS/TS/TSR)

Make sure before servicing brewer that voltage is present at control board.

On CDBC-APS/TS/TSR models, observe if indicator light is glowing on the control panel. If so, proceed with
testing. If not, check for voltage across pins 1 & 2 of the ten pin J1 connector (black and white wires). If voltage
is present, replace the control board. If voltage is not present, check wiring and voltage across terminal block
(black and white). Correct the problem and retest before proceeding with testing.

On CEZ-APS/TS/TSR models, check for voltage across pins 1 & 7 of the eight pin J1 connector (black and white
wires). If voltage is present, proceed with testing. If voltage is not present, check wiring and voltage across
terminal block (black and white). Correct the problem and retest before proceeding with testing.

Page 9

29253 071599

TROUBLESHOOTING (cont.)

REFILL CIRCUIT

PROBABLE CAUSE REMEDYPROBLEM

Will not fill or refill

1. Power off to brewer (CDBC­APS/TS/TSR & CEZ-APS/TS/TSR)

2. Water shut off (CDBC-APS/TS/
TSR & CEZ-APS/TS/TSR)

3. Display flashing (CDBC-APS/
TS/TSR) or ready light flashing
(CEZ-APS/TS/TSR)

4. ON/OFF Switch (CDBC-APS/TS/
TSR & CEZ-APS/TS/TSR)

5. Lime build up on Probe (CDBC­APS/TS/TSR & CEZ-APS/TS/TSR)

6. Refill Valve or Control Board
(CDBC-APS/TS/TSR & CEZ-APS/
TS/TSR)

Press ON/OFF switch on control
panel to determine if power is ON.

Make sure water is ON.

Brewer has shut down due to
malfunction (See Diagnostic Chart
in manual, Page 19, or under top
lid of brewer).

Make sure ON/OFF Switch is "ON"
and indicator is lit.

Remove the Probe and check for
lime deposit on tip. Clean and
reinstall.

Disconnect the brewer from the
power source and remove wires
from refill valve coil. Check for
continuity across the terminals of
the solenoid coil. If continuity is
not present, replace the refill valve
(See page 30). If continuity is
present, the valve may be stuck
closed. Shut water off to brewer.
Set the ON/OFF switch to the "OFF"
position. Open the faucet and drain
water down in the tank until flow
stops or slows to a trickle. Attach
a voltmeter to the terminals of the
refill solenoid. Connect the brewer
to the power source. Press the
switch "ON". Within five seconds,
voltage should be present at the
solenoid terminals. If voltage is
not present, refer to the wiring
diagrams and check the wiring
harness.

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29253 071599