Bunn CDBC TWIN User Manual

CEZ CDBC TWIN

CAUTION :

OPERATING & SERVICE MANUAL

BUNN-O-MATIC CORPORATION

POST OFFICE BOX 3227

SPRINGFIELD, ILLINOIS 62708-3227

PHONE: (217) 529-6601 FAX: (217) 529-6644

www.bunnomatic.com

INTRODUCTION

This equipment will brew one or two half-gallon batches of coffee simultaneously into awaiting dispensers with just the press of a button. One side may include a hot water faucet 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 Adjustments & Optional Settings................................................................ 7

CDBC Adjustments & Optional Settings............................................................. 8

CDBC Water Sensing Threshold Adjustment Procedure .................................... 9

CDBC Pulse Brew Setup Procedure ................................................................. 10

Troubleshooting ............................................................................................... 11

Diagnostics ...................................................................................................... 21

Service............................................................................................................. 22

Wiring Diagrams.............................................................................................. 34

BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY

Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows:

1) All equipment other than as specified below: 2 years parts and 1 year labor.

2) Electronic circuit and/or control boards: parts and labor for 3 years.

3) Compressors on refrigeration equipment: 5 years parts and 1 year labor.

4) Grinding burrs on coffee grinding equipment to grind coffee to meet original factory screen sieve analysis: parts and labor for 3 years or 30,000 pounds of coffee, whichever comes first. These warranty periods run from the date of installation BUNN warrants that the equipment manufactured by it will be commercially free of defects in material and workmanship existing at the time of manufacture and appearing within the applicable warranty period. This warranty does not apply to any equipment, component or part that was not manufactured by BUNN or that, in BUNN’s judgment, has been affected by misuse, neglect, alteration, improper installation or operation, improper maintenance or repair, damage or casualty. This warranty is conditioned on the Buyer 1) giving 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; 2) if requested by BUNN, shipping the defective equipment prepaid to an authorized BUNN service location; and 3) receiving prior authorization from BUNN that the defective equipment is under warranty.

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. If BUNN determines in its sole discretion that the equipment does not conform to the warranty, BUNN, at its exclusive option while the equipment is under warranty, shall either 1) provide at no charge replacement parts and/or labor (during the applicable parts and labor warranty periods specified above) to repair the defective components, provided that this repair is done by a BUNN Authorized Service Representative; or 2) shall 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, AT BUNN’S SOLE OPTION AS SPECIFIED HEREIN, TO REPAIR, 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.

BUNN, CDBC TWIN, and CDBCF TWIN are either trademarks or registered trademarks of Bunn-O-Matic Corporation.

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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.

# 00986.0000

# 00656.0000

# 00658.0000

! WARNING

DO NOT OVERLOAD CIRCUIT. ALWAYS ELECTRICALLY GROUND THE CHASSIS OR ADAPTOR PLUG. DO NOT DEFORM PLUG OR CORD. FOLLOW NATIONAL AND LOCAL ELECTRICAL CODES. KEEP COMBUSTIBLES AWAY.

FAILURE TO COMPLY RISKS EQUIPMENT

DAMAGE, FIRE OR SHOCK HAZARD.

READ THE ENTIRE

OPERATING MANUAL BEFORE

USING THIS PRODUCT

# 12364.0000

# 10044.0000

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ELECTRICAL REQUIREMENTS

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

L2 RED

WHITE

NEUTRAL

L1 BLACK

120V.A.C.

208 or 240V.A.C.

120V.A.C.

One circuit models require one 3-wire, grounded service rated 120/208

or 120/240 volts ac, 40 amp, single phase, 60 Hz.

Two circuit models require two 3-wire, grounded service rated 120/208

or 120/240 volts ac, 20 amp, single phase, 60 Hz.

Proceed as follows:

Initial Set-Up.

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 5 and 90 psi (34.5 and 620 kPa) for CDBC models and 20 and 90 psi (138 and 620 kPa) for CEZ models 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 3⁄8" 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 3⁄8" copper tubing from a 1⁄2" or larger 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.

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OPERATING CONTROLS

Model CEZ TWIN

ON/OFF BREW FRONT-SIDE-REAR ON/OFF BREW FRONT-SIDE-REAR

ON/OFF SWITCH

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

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

ADDITIONAL WARMER SWITCHES

Placing any additional warmer switch in the "ON" upper position supplies power to the associated warmer.

READY INDICATOR

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

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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.

ADDITIONAL WARMER SWITCHES

Pressing any additional warmer switch so the indicator is glowing, supplies power to the associated warmer.

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.

INITIAL SET-UP

1. Insert an empty funnel into the funnel rails of one of the brew stations.

2. Place an empty decanter under the funnel.

3. Connect the brewer to the power source.

4. Model CDBC – Press the "ON/OFF" switch (indicator glowing). Model CEZ – 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 water once again flowing into the tank.

8. Model CDBC – With the "ON/OFF" switch still in the "ON" position (indicator glowing), momentarily press and release the "BREW" switch. Model CEZ – With the "ON/OFF" switch still in the "ON" (upper position), momentarily press and release the "BREW" switch.

9. Allow the cycle to finish and measure the amount of water in the decanter. It should be 64 ounces ± 2. Refer to the adjustments section of this manual should the volume need to be increased or decreased.

NOTE: Repeat steps 1 through 9 for the other brew station.

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 decanter beneath the funnel.

5. Model CDBC – Press the "ON/OFF" switch (indicator glowing), then momentarily press and release the "BREW" switch. Model CEZ – 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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CEZ ADJUSTMENTS & OPTIONAL SETTINGS

Page 7

CDBC ADJUSTMENTS & OPTIONAL SETTINGS

HIDDEN

SWITCH

HIDDEN

SWITCH

P1871

NOTE: The following adjustments must be performed for each Brew Station.

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.

Adjusting Automatic Warmer Shut-Off

The brewer is factory set with this feature disabled. The automatic warmer shut-off deenergizes all warmers after a predetermined time period after the most recent brew cycle. To change the setting, press and hold the "BREW" switch and the "HIDDEN" switch beneath the "®" for five seconds, the entire bank of temperature indicators will flash on-and-off. Release both switches. Pressing and releasing the "BREW" switch will select the number of temperature indicators from none to five. When no indicators are glowing, this feature is disabled and all warmers will be controlled only by their respective switches. When one to five indicators are glowing, it indicates the approximate number of hours of delay before all warmers will be automatically deenergized after the most recent brew cycle.

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

Sprayhead must be installed while making these adjustments.

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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 decanter or graduated vessel beneath the funnel.

2. Press the "ON/OFF" switch (indicator glowing).

3. Press and hold the brew start button until you hear the brew solenoid click on-and-off three times (approximately 10 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

decanter 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 10 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

decanter 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 10 seconds), then release the "BREW" switch and allow the cycle to finish.

WATER SENSING THRESHOLD ADJUSTMENT PROCEDURE (CDBC TWIN & CDBCF TWIN)

1. Make sure the tank is full of water to be used for calibration. The water must be in contact with the refill probe.

2. Unplug the brewer from the power source, then press and hold the BREW button while power is reapplied.

3. Continue pressing the BREW button until the READY indicator begins to flash. Release the BREW button and then press it again momentarily.

4. The new calibration is automatically completed within a few seconds. If the water is too pure for use with the brewer, the READY indicator will flash very rapidly and the old calibration will be retained.

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PULSE BREW SETUP PROCEDURE (CDBC TWIN & CDBCF TWIN)

The pulse brew parameters (initial fill time, off times, and remaining on times) are entered using the following setby-example process.

1. First set the brew volume using the standard procedure in

2. Position an empty container under the sprayhead. Allow the tank to finish refilling. Make sure that the READY lamp is on, or that the BREW LOCKOUT function is turned off.

3. Press and hold the OFF/ON button. The brew valve will turn on after 10 seconds. Release the button. This begins the initial on-time setting. When the spray has continued for the desired time, momentarily press the OFF/ON button.

4. The spray is now stopped and the off time setting has begun. Press the OFF/ON button momentarily to end the off time.

5. The spray is now on again and the remaining on time setting has begun. Press the OFF/ON button momentarily at the end of the desired remaining on time.

6. The setup is now complete and the parameters are stored in memory. The spray will continue the off and on cycles until the brew volume of step 1 is complete. Pressing the OFF/ON button again will terminate the brewing cycle, with the parameters stored in memory.

7. If only a preinfusion is desired, i.e. an initial on time followed by one off period, use the same procedure, but stop after step 4 and allow the brew to finish the volume set in step 1. This will store the initial on time and off time in memory.

Brew Volume Setup.

Procedure for Disabling Pulse Brew or Preinfusion:

1. Position an empty container under the sprayhead. Allow the tank to finish refilling. Make sure that the READY lamp is on, or that the BREW LOCKOUT function is turned off.

2. Press and hold the OFF/ON button. The brew valve will turn on after 10 seconds. Release the button.

3. Allow the spray to continue and press no buttons until spray stops. The pulse and preinfusion functions are now disabled.

NOTE: When the brewer has been set up for pulse or preinfusion, the adjustment of brew volume is done the same as always and has no effect on the pulse brew parameters. The pulsing is temporarily disabled while adjusting the brew volume and automatically returns during normal brewing.

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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 TWIN)

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 TWIN)

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 TWIN & CEZ TWIN)

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

On CDBC TWIN models, press any warmer switch or observe if any indicator lights are 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 TWIN 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.

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+ 25 hidden pages

Bunn CDBC TWIN User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual