Bunn CDBC User Manual
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CDBC, CDBCF
CDBC APS, CDBCF APS
CDBC TC, CDBCF TC
(Dual Voltage Models
Starting at Serial #CDBC024477)
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OPERATING & SERVICE MANUAL
INTRODUCTION
This equipment will brew a half-gallon batch of coffee into an awaiting dispenser. It can be easily configured for 120V
15 amp, 120/208V 20 amp or 120/240V 20 amp. The brewer may have a hot water faucet for allied beverage use. It is only
for indoor use on a sturdy counter or shelf.
CONTENTS
Introduction & Warranty .................................................................................... 2
User Notices ...................................................................................................... 3
Electrical Requirements ..................................................................................... 5
Plumbing Requirements, Initial Set-Up & Coffee Brewing ................................. 6
Cleaning & Operating Controls .......................................................................... 7
Adjustments & Optional Settings ....................................................................... 8
Pulse Brew Setup Procedure ............................................................................. 9
Water Sensing Threshold Adjustment Procedure .............................................. 9
Troubleshooting ............................................................................................... 10
Diagnostics ...................................................................................................... 20
Service............................................................................................................. 21
Wiring Diagrams.............................................................................................. 31
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.
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29707.1 021804
USER NOTICES
Optional Field Wiring
120/208-240 V, 13.0-15.0 A, 2680-3550 W
1PH, 3-Wire, 60HZ
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.
Optional Field Wiring
120 V, 15.0 A, 1800 W
1PH, 2-Wire, 60HZ
#29710.0005 (3 Warmers)
CDBC(F)-DV BREWERS
#00658.0000
#00831.0000
! CAUTION
When re-wiring the machine for operation on
120/208V or 120/240V, the replacement Power
Supply Cord must be UL Listed Flexible Cord Type
SO, SJO, SJTO, HSJO or SJOW, No. 12 AWG, 4
Conductor, Rated 90° C. Attachment Plug Cap
must be UL Listed, NEMA 14-20P or L14-20P
Configuration, Rated 125/250V, 20 AMPS. The
Power Supply Cord must be at least 3 feet long
and maximum 6 feet long (measured from Strain
Relief to end of the Attachment Plug Cap.)
Optional Field Wiring
120 V, 12.5 A, 1500 W
1PH, 2-Wire, 60HZ
#29710.0006 (No Warmer)
CDBC(F) APS-DV BREWERS
Optional Field Wiring
120/208-240 V, 15.6-17.5 A, 2980-3850 W
1PH, 3-Wire, 60HZ
#29710.0007 (3 Warmers)
CDBC(F)-DV BREWERS
#34072.0000
Page 3
#29710.0008
CDBC(F) APS-DV & TC-DV
BREWERS
29707.1 082803
USER NOTICES (CONT.)
#02765.0000
#12364.0000
#00656.0000
Page 4
29707.1 082803
Models CDBC-DV, CDBC-APS DV & CDBCF TC-DV
ELECTRICAL REQUIREMENTS
CAUTION - The brewer must be disconnected from the power source until specified in
Requirements for brewers without an attached cord set are as follows:
Initial Set-Up.
120V VERSION
Requires 2-wire,
grounded service
rated 120 volts ac,
15 amp, single
phase, 60 Hz.
ELECTRICAL HOOK-UP
CAUTION – Improper electrical installation will damage electronic components.
1. An electrician must provide electrical service.
2. Determine the available on-site electrical service.
3. Select the desired unit voltage based on the available on-site electrical service.
4. Using a voltmeter, check the voltage and color coding of each conductor at the electrical source.
5. Remove the front access panel beneath the sprayhead to gain access to the terminal block.
6. Feed the supply leads through the rear of the brewer.
7. Using the above diagrams, connect the desired electrical service to the field wiring terminal block.
8. If wiring the machine for operation on 120/208 or 120/240 volts with a Power Supply Cord, the Power Supply
Cord must be UL Listed Flexible Cord Type SO, SJO, SJTO, HSJO or SJOW, No. 12 AWG, 4 Conductor, Rated
90° C. Attachment Plug Cap must be UL Listed, NEMA 14-20P or L14-20P Configuration, Rated 125/250V,
20 AMPS. The Power Supply Cord must be at least 3 feet long and maximum 6 feet long (measured from Strain
Relief to end of the Attachment Plug Cap).
9. Before proceeding, verify the voltage at the field wiring terminal block.
10. Set toggle switch on component bracket to the appropriate position and replace the access panel.
11. 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
.
120/208-240V VERSION
Requires 3-wire,
grounded service
rated 120/208-240
volts ac, 20 amp,
single phase, 60 Hz.
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29707.1 082803
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.
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 counter top. 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).
1. Flush the water line and securely attach it to the inlet fitting at the left rear of the brewer.
2. Turn on the water supply.
INITIAL SET-UP
1. Insert an empty funnel into the funnel rails.
2. Place a decanter with a small amount of water under the funnel.
3. Connect the brewer to the power source.
4. Press the "ON/OFF" switch (indicator glowing).
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. FAUCET MODELS:
On faucet models, place a decanter beneath the faucet and open the faucet handle. Release it when you hear
the tank refilling. Empty and place back onto warmer under the funnel.
NON-FAUCET MODELS
On non-faucet models, initiate a brew cycle and allow it to run approximately 20 seconds. Turn the ON/OFF
switch to the "OFF" position. Allow the water to drain and empty the decanter.
8. With the "ON/OFF" switch in the "ON" position (indicator glowing), 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.
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. Press the "ON/OFF" switch (indicator glowing) then momentarily press and release the "BREW" switch.
6. When brewing is completed, simply discard the grounds and filter.
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29707.1 021804
CLEANING
1. The use of a damp cloth rinsed in any mild, nonabrasive, 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.
OPERATING CONTROLS
ON/OFF SWITCH
Pressing the "ON/OFF" switch (indicator glowing) supplies power to
the brew station warmer, enables the brew circuit, and energizes the
tank refill circuit. Pressing the switch again (indicator not glowing)
stops tank refilling and brewing and de-energizes 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.
P1626
NOTE – Hot water will be available at the faucet in a limited amount
when the "ON/OFF" 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" 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 that 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.
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29707.1 021004
ADJUSTMENTS & OPTIONAL SETTINGS
P1866
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.
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 de-energizes 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 de-energized after the most recent
brew cycle.
IMPORTANT: The tank must be full and fill solenoid shut off prior to making these adjustments. The sprayhead
must be installed when making 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 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
Page 8
29707.1 021804
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 5 seconds), then
release the "BREW" switch and allow the cycle to finish.
PULSE BREW SETUP PROCEEDURE
The pulse brew parameters (initial fill time, off times, and remaining on times) are entered using the following
set-by-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.
Brew Volume Setup.
Page 9
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:
Control Boards
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.
3. Make sure before servicing brewer that voltage is present at control board.
4. 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.
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29707.1 082803
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