CDBC-MV, CDBCF-MV
CDBC-MV, CDBCF APS-MV
CDBC-DV, CDBCF-DV
CDBC APS-DV CDBCF APS-DV
(DV Models prior to
Serial #CDBC024477)
DISCONTINUED VERSION
The information in this manual
BUNN
:
N
AUTIO
C
is no longer current.
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
29707.0000H 10/03 ©1999 Bunn-O-Matic Corporation www.bunnomatic.com
INTRODUCTION
This equipment will brew a half-gallon batch of coffee into an awaiting dispenser. It can be easily configured
for 120V 15 amp, 120V 20 amp (MV models only), 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.
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.
Page 2
29707 080503
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.
Optional Field Wiring
120 V, 17.0 A, 2050 W
#00658.0000
1PH, 2-Wire, 60HZ
120/208-240 V, 13.6-15.3 A, 2640-3430 W
1PH, 3-Wire, 60HZ
#29710.0002 (MV models only)
TWO WARMER BREWERS
Optional Field Wiring
120 V, 18.0 A, 2150 W
1PH, 2-Wire, 60HZ
120/208-240 V, 14.4-16.2 A, 2740-3530 W
1PH, 3-Wire, 60HZ
or
or
#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.)
#29710.0000 (MV models only)
THREE WARMER BREWERS
Optional Field Wiring
120/208-240 V, 14.4-16.2 A, 2740-3530 W
1PH, 3-Wire, 60HZ
#29710.0003 (DV models only)
THREE WARMER BREWERS
Optional Field Wiring
120/208-240 V, 12-13.7 A, 2440-3230 W
1PH, 3-Wire, 60HZ
#34072.0000
Page 3
#29710.0004 (DV models only)
APS BREWERS
29707 080503
USER NOTICES (CONT.)
Optional Field Wiring
120 V, 15.0 A, 1800 W
1PH, 2-Wire, 60HZ
#29710.0005 (DV models only)
CDBCF-DV BREWERS
Optional Field Wiring
120/208-240 V, 13.0-15.0 A, 2680-3550 W
1PH, 3-Wire, 60HZ
#29710.0008 (DV models only)
CDBC LPTC-DV BREWERS
Optional Field Wiring
120/208-240 V, 15.6-17.5 A, 2980-3850 W
1PH, 3-Wire, 60HZ
#29710.0007 (DV models only)
NO WARMER BREWERS
Optional Field Wiring
120 V, 16.2 A, 1950 W
1PH, 2-Wire, 60HZ
or
120/208-240 V, 12.7-14.5 A, 2540-3330 W
1PH, 3-Wire, 60HZ
#29710.0001 (MV models only)
ONE WARMER BREWERS
#02765.0000
#12364.0000
#00656.0000
Page 4
29707 080503
Models CDBC-DV, CDBC-APS DV & CDBCF LPTC-DV
ELECTRICAL REQUIREMENTS
CAUTION - The brewer must be disconnected from the power source until specified in
Brewers with an attached cord set require 2-wire, grounded service rated 120 volts ac, 15 amp, single
phase, 60 Hz. Requirements for brewers without an attached cord set are as follows:
1425W VERSION 3180W VERSION
Initial Set-Up.
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. The toggle switch is set to operate
on a 120 volt, 15 amp service (1425W Version).
1. An electrician must provide electrical service.
2. Determine the available on-site electrical service.
3. Select the desired unit wattage 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. If the brewer is to be connected to 120/208 or 120/240 volts, remove the front access panel beneath the
sprayhead and remove the power cord (if provided) from 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 re-wiring the machine for operation on 120/208 or 120/240 volts with a Power Supply Cord, 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).
9. Before proceeding, verify the voltage at the field wiring terminal block.
10. Set toggle switch on component bracket to the appropriate position (120/208-240V) 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
.
Requires 3-wire,
grounded service
rated 120/240 volts
ac, 20 amp, single
phase, 60 Hz.
Page 5
29707 080503
Models CDBC-MV & CDBC-APS MV
ELECTRICAL REQUIREMENTS
CAUTION - The brewer must be disconnected from the power source until specified in
TANK HEATER TERMINAL BLOCK WIRING DIAGRAM
(CDBC-MV MODELS)
1800W @ 120V
1800W
1425W @ 120V
2390W @ 120/208V
3180W @ 120/240V
1800W
or
1800W
Initial Set-Up.
W
H
T
120V A.C.
120V A.C.
1425W
208 or
240V A.C.
WHITE
NEUTRAL
L1 BLACK
1425W
B
B
L
K
W
L
H
U
T
REDWHIBLK
120V A.C.
B
L
K
WHITE
NEUTRAL
L1 BLACK
B
L
U
1425W
W
H
T
REDWHIBLK BLK WHIRED
L2 REDL2 REDL2 RED
WHITE
120V A.C.
NEUTRAL
L1 BLACK
B
B
L
L
K
U
FIELD WIRING TERMINAL BLOCK DIAGRAM
1800W VERSION 1425W VERSION 2390W VERSION 3180W VERSION
Requires 2-wire,
grounded service
rated 120 volts ac,
20 amp, single
phase, 60 Hz.
Requires 2-wire,
grounded service
rated 120 volts ac,
15 amp, single
phase, 60 Hz.
Requires 3-wire,
grounded service
rated 120/208 volts
ac, 20 amp, single
phase, 60 Hz.
Requires 3-wire,
grounded service
rated 120/240 volts
ac, 20 amp, single
phase, 60 Hz.
P1888
ELECTRICAL HOOK-UP
CAUTION – Improper electrical installation will damage electronic components. This unit is factory wired for
operation on a 120 volt, 15 amp service (1425W Version).
1. An electrician must provide electrical service and verify that the tank heater connections are connected as
specified in the above diagram.
2. Determine the available on-site electrical service.
3. Select the desired unit wattage 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 panel beneath the sprayhead.
6. Feed the supply leads through the rear panel of the brewer.
7. Using the above diagrams, connect the desired electrical service to the field wiring terminal block and remove
the top cover of the brewer to verify the tank heater terminal block connections.
8. The electrical service connections at the field wiring terminal block must agree with the tank heater terminal
block connections as specified in the above diagram.
9. Before proceeding, verify the voltage at the field wiring terminal block. Replace the panel and top cover.
10. 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
Page 6
.
29707 112801
PLUMBING REQUIREMENTS
These brewers must be connected to a cold water system with operating pressure between 20 and 90 psi (138
1
and 620 kPa) from a
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
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
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
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.
⁄2" or larger supply line. A shut-off valve should be installed in the line before the brewer. Install
⁄4" flare.
1
⁄2" water supply line. A tight coil of copper tubing in the water line will facilitate moving the brewer
Building Officials and Code Administrators International, Inc. (BOCA)
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. 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.
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.
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.
Page 7
29707 112801
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.
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 8
29707 112801
ADJUSTMENTS & OPTIONAL SETTINGS
HIDDEN
SWITCH
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.
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 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).
Page 9
29707 112801
ADJUSTMENTS & OPTIONAL SETTINGS (CONT.)
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
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 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
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.
WATER SENSING THRESHOLD ADJUSTMENT PROCEDURE
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.
Page 10
29707 102803
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.
Page 11
29707 112801
TROUBLESHOOTING (cont.)
REFILL CIRCUIT
PROBABLE CAUSE REMEDYPROBLEM
Will not fill or refill
1. Power off to brewer
2. Water shut off
3. Display flashing
4. ON/OFF Switch
5. Lime build up on Probe
6. Refill Valve or Control Board
Press warmer switches 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 20, or under top lid of
brewer).
Make sure ON/OFF Switch is "ON"
and indicator is lit.
Remove the Level 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 29). If continuity is present,
the coil 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.
Page 12
29707 112801
TROUBLESHOOTING (cont.)
REFILL CIRCUIT (cont.)
PROBLEM
Fill or refill does not shut "OFF" (ON/
OFF Switch "ON")
Fill or refill does not shut "OFF" (ON/
OFF Switch "OFF")
PROBABLE CAUSE REMEDY
1. Lime build up on probe
Remove Level Probe and check for
lime deposits on tip. Clean and reinstall.
2. Water Level Probe Sensing System
Disconnect the brewer from the
power source. Disconnect the J3
connector from the control board.
Check for continuity from the nut
on top of the level probe to pin 1 of
the plug, continuity should be
present. Pull the temperature probe
up about an inch from the grommet. Check for continuity from the
outside surface of the temperature
probe and pin 4 of the plug, continuity should be present. Connect
the J3 plug to the control board and
proceed to step 3.
3. Refill valve or control board
Press ON/OFF switch to "ON" (Indi-
cator lamp should be lit). If water
continuously flows out of air vent
tube, disconnect the brewer from
the power source. If water flow
stops, replace the control board. If
water flow does not stop, repair or
replace the refill solenoid. (See page
29)
1. Refill valve or control board
If water continuously flows out of
air vent tube, disconnect the brewer
from the power source. If water
flow does not stop, repair or replace
the refill solenoid. If the valve closes
when power is removed, replace
the control board. (See page 22)
Page 13
29707 112801
TROUBLESHOOTING (cont.)
HEATING CIRCUIT
PROBLEM PROBABLE CAUSE REMEDY
Water does not heat to proper temperature
IMPORTANT: Make sure no temperature tests are taken before the
ready light is "ON". Tank temperature must be stabilized before readings are taken.
1. Display flashing
2. Water not touching temperature
probe
3. Water Level Probe Sensing System
Brewer has shut down due to malfunction (See Diagnostic Chart in
manual, Page 20, or under top lid).
Remove temperature probe and
grommet. Look into hole on tank
lid. Water must be within one inch
from top of tank.
Disconnect the brewer from the
power source. Disconnect the J3
connector from the control board.
Check for continuity from the tank
mounting screw where the green
wire mounts, to pin 2 of the plug,
continuity should be present. Pull
the temperature probe up about an
inch from the grommet. Check for
continuity from the outside surface
of the temperature probe and pin 4
of the plug, continuity should be
present. Connect the J3 plug to the
control board and proceed to step
4.
4. Temperature Probe
5. Limit Thermostat
Remove the probe from the grommet and submerge in a water bath
of approximately 70°F(21°C). Con-
nect an ohmmeter to pins 3 and 4 of
the J3 connector. At 60°F(16°C) the
reading should be 15.3k ± 2k OHMS,
at 70°F(21°C) the reading should
be 11.8k ± 2k OHMS, and at
80°F(27°C) the reading should be
9.3k ± 2k OHMS. If the probe is
within these parameters, reconnect
the J3 plug to the control board.
Disconnect the brewer from the
power source. Check for continuity
across the limit thermostat terminals. Continuity should be present.
If not replace the limit thermostat.
(See page 25)
Page 14
29707 112801
TROUBLESHOOTING (cont.)
HEATING CIRCUIT (cont.)
PROBLEM PROBABLE CAUSE REMEDY
Water does not heat to proper temperature (cont.)
IMPORTANT: Make sure no temperature tests are taken before the
ready light is "ON". Tank temperature must be stabilized before readings are taken.
6. Tank Heater
7. Fuse Holder & Fuse (MV models
only)
8. Thermal Fuse (MV models only)
Disconnect the brewer from the
power source. Check for continuity
between the white terminal of the
terminal block (or red terminal on
208/240volt models) and the black
wire on the relay on the control
board (Toggle Switch must be in
120/208-240V position on 208V &
240V models). There should be a
low OHM reading. If no continuity is
present, check for a wiring problem, then replace the tank heater if
no wiring problem is found. (See
page 26)
Check fuse and replace if necessary. (See page 31)
Check thermal fuse for continuity
and replace if necessary. (See page
32)
Page 15
29707 112801
TROUBLESHOOTING (cont.)
HEATING CIRCUIT (cont.)
PROBLEM PROBABLE CAUSE REMEDY
Spitting or excessive steaming
(cont.)
1. Lime build up on temperature
probe, tank or tank heater
2. Temperature Probe
3. Control Board
Inspect probe and tank assembly
for excessive lime deposits. Delime
as required.
Remove the probe from the grommet and submerge in a water bath
of approximately 70°F(21°C). Con-
nect an ohmmeter to pins 3 and 4 of
the J3 connector. At 60°F(16°C) the
reading should be 15.3k ± 2k OHMS,
at 70°F(21°C) the reading should
be 11.8k ± 2k OHMS, and at
80°F(27°C) the reading should be
9.3k ± 2k OHMS. If the probe is
within these parameters, reconnect
the J3 plug to the control board.
Set the temperature to 200°F(93°C).
Let tank temperature stabilize. If
temperature in tank is above tem-
perature setting by more than 7°F,
replace the control board. (See page
22)
Brewer is making unusual noises
1. Plumbing lines
2. Water supply
3. Lime build up
Plumbing lines should not rest on
the counter top.
The brewer must be connected to a
cold water supply.
Remove the tank lid and clean inside of tank with a deliming agent, if
necessary.
Page 16
29707112801
TROUBLESHOOTING (cont.)
BREWING CIRCUIT
PROBLEM PROBABLE CAUSE REMEDY
Brew cycle will not start 1. Display flashing
2. No water
3. No power or incorrect voltage to
the brewer
4. ON/OFF switch not in the "ON"
position
5. Low water temperature (Brew
lockout is enabled)
6. Water not touching refill probe
inside tank
Brewer has shut down due to malfunction (See Diagnostic Chart in
manual, Page 20, or under top lid of
brewer).
Water lines and valves to the brewer
must be open.
Check for voltage across the terminals at the terminal block.
The indicator lamp must be lit
Allow brewer to heat until ready
lamp is lit, or disable the brew lockout feature. (See page 8)
Press ON/OFF switch (indicator
must be lit). Brewer will refill until
water touches probe inside tank.
Water must be in contact with refill
probe before brew cycle will start.
7. Switch panel
Disconnect the brewer from the
power source. Disconnect the ribbon connector from the control
board. Check for continuity between
pins 1 & 2 (An arrow on the connector indicates pin 1). No continuity
should be present. Press the BREW
switch. Continuity should be present
for as long as the switch is held
down. If no continuity is present,
replace the switch membrane decal. (See page 23)
Page 17
29707 112801
TROUBLESHOOTING (cont.)
BREWING CIRCUIT (cont.)
PROBLEM PROBABLE CAUSE REMEDY
Brew cycle will not start (cont.)
Consistently low beverage level in
the dispenser or beverage overflows
dispenser
8. Control board or dispense valve
1. Brew volume
NOTE: Volume adjustments must
be made with sprayhead installed.
If the switch panel is operating properly, proceed as follows. Attach a
voltmeter to the terminals of the
dispense solenoid. Connect the
brewer to the power source. Turn
on the brewer and press the BREW
switch. Voltage should be present
at the solenoid terminals. If voltage
is not present, refer to the wiring
diagrams and check the wiring harness. If voltage is present, check for
continuity across the terminals of
the solenoid coil. If continuity is not
present, replace the solenoid (See
page 24). If continuity is present,
the valve may be stuck closed.
Set up brewer according to instructions in section
Volumes
Adjustments-Brew
. (See page 8) Using a stop
watch or second hand, time the
length of the brew cycle. Record
this time inside the top lid. If service
is ever needed again, use the time
as reference to determine if time
has changed.
2. Lime build up
3. Dispense Valve
Inspect the dispense valve and
sprayhead for excessive lime deposits. Delime as required.
Remove dispense valve and clear
any obstructions. Rebuild or replace valve if necessary. (See page
24)
Page 18
29707 112801
TROUBLESHOOTING (cont.)
BREWING CIRCUIT (cont.)
PROBLEM PROBABLE CAUSE REMEDY
Dripping from sprayhead
Weak beverage
1. Lime build up
2. Dispense valve
1. Sprayhead
2. Water temperature
3. Filter type
Inspect the tank assembly for excessive lime deposits. Delime as
required.
Remove the dispense valve and clear
any obstructions. Rebuild or replace the valve if necessary. (See
page 24)
A six-hole stainless steel sprayhead
must be used for proper extraction.
Place an empty brew funnel on an
empty decanter beneath the sprayhead. Initiate brew cycle and check
the water temperature immediately
below the sprayhead with a thermometer. The reading must not be
less than 195°F (91°C). Adjust the
temperature setting to increase the
water temperature. Refer to
Set-up
instructions.
Initial
BUNN® paper filters must be used
for proper extraction.
4. Coffee grind
5. Funnel loading
A fine drip or grind must be used for
proper extraction.
The BUNN® paper filter must be
centered in the funnel and the bed
of grounds leveled by shaking gently.
Page 19
29707 112801
TROUBLESHOOTING (cont.)
BREWING CIRCUIT (cont.)
PROBLEM PROBABLE CAUSE REMEDY
Dry coffee grounds remain in the
funnel
Low beverage serving temperature
1. Sprayhead
2. Funnel loading
1. Warmer
Make sure sprayhead is present and
holes are clear and unobstructed.
There should be six separate
streams of water coming out of the
sprayhead.
The BUNN® paper filter must be
centered in the funnel and the bed
of grounds leveled by shaking gently.
Disconnect the brewer from the
power source. Remove the warmer
plate and turn upside down to expose the warmer terminals. Remove
the two wires. Check for continuity
across the two warmer terminals. If
continuity is not present, replace
the warmer element (See page 30).
If continuity is present, reconnect
the wires to the warmer element.
Check for voltage at the warmer
terminals. Turn the warmer switch
"ON". The indicator light will come
on. Voltage should be present at the
terminals. If not, disconnect power
supply and check wiring and switch.
Page 20
29707 112801
DIAGNOSTICS
Intermittent flashing of the bank of temperature indicators, indicates that a fault exists. Count the number of flashes
between pauses and use this chart as a guide to investigating the fault.
FLASHES CAUSE THINGS TO CHECK
1 Dry Plug - In Fault - Water Pressure (Is water shut "OFF"?)
Sheath of temperature probe dry for 10 minutes after power-up Temperature probe wiring
Fill valve wiring, function, & strainer
Green wire between tank and circuit board
2 Low Tank Level Fault - Water pressure (Is water shut "OFF"?)
Level probe dry for 7 minutes after fill valve is energized Level probe wiring
Temperature probe wiring
Fill valve wiring, function, & strainer
3 Low Water Temperature Fault - Tank heater wiring & function
Sensor in tank is calling for heat for 30 minutes or more Temperature probe wiring
4 Tank Sensor Disagreement - Temperature probe wiring
Level probe detects water, but dry plug-in probe dry Level probe wiring
Green wire between tank and circuit board
5 Temp Sensor Out-of-Range - High Sensor not connected to circuit board
6 Temp Sensor Out-of-Range - Low Sensor wires shorted together or to chassis
Page 21
29707 112801
SERVICE
This section provides procedures for testing and
replacing various major components used in this
brewer should service become necessary. Refer to
Troubleshooting
cause of any problem.
WARNING - Inspection, testing, and repair of electrical equipment should be performed only by qualified
service personnel. The brewer should be unplugged
when servicing, except when electrical tests are required and the test procedure specifically states to
plug in the brewer.
COMPONENT ACCESS
WARNING - Disconnect the brewer from the power
source before the removal of any panel or the replacement of any component.
All components are accessible by the removal of
the top cover or warmer housing, front access panel
and warmer plate(s).
for assistance in determining the
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The top cover is attached with one #4-40 screw.
The front access panel is attached with four #6-32
screws.
Each warmer assembly is attached with three #4-
40 screws.
Contents
Control Board .................................................... 22
Switch Panel ...................................................... 23
Dispense Valve .................................................. 24
Limit Thermostat ............................................... 25
Tank Heaters...................................................... 26
Voltage Selector Switch ..................................... 28
Refill Valve .........................................................29
Warmer Elements ..............................................30
Fuse Holder and Fuse ........................................ 31
Thermal Fuse .....................................................32
Wiring Diagrams............................................... 33
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Page 22
P1889
FIG. 1 COMPONENT ACCESS
29707 112801
SERVICE (cont.)
CONTROL BOARD
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A
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:
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P1846
FIG. 2 CONTROL BOARD
Location:
The Control Board is located inside the top cover
behind the front end cap.
Test Procedures:
The test procedures for the control board will vary
depending upon the problems experienced by the
brewer. Refer to the Troubleshooting guide beginning
on page 10. The troubleshooting guide is divided into
three sections, Refill Circuit, Heating Circuit, and Brewing Circuit.
Removal and Replacement:
1. Disconnect the black wire and blue wire from the
relay on the control board.
2. Disconnect the 10-pin connector and the 4-pin
connector from the main wiring harness.
3. Disconnect the 11-pin connector from the control
panel.
4. Remove the four #6 screws and four nylon washers and the two #4-40 screws securing the control
board to the end cap assembly.
5. Install a new control board and secure with the
four #6 screws and nylon washers and the two #440 screws to the end cap assembly.
NOTE: The four nylon washers must be installed
under the heads of the four #6 screws to prevent
a possible shorting of the control board circuits.
6. Connect the 11-pin connector from the control
panel.
7. Connect the 10-pin connector and the 4-pin connector from the main wiring harness.
8. Connect the blue wire and black wire to the relay on
the control board.
9. Refer to
Adjustments and Optional Settings
(See
page 9) to program the new control board.
Page 23
29707 112801
SERVICE (cont.)
SWITCH PANEL
FIG. 3 SWITCH PANEL
Location:
The Switch Panel is located in the front of the
hood.
P1848
Removal and Replacement:
1. Disconnect the 11-pin connector to the switch
panel from the control board.
2. Remove the four #6 screws, nylon washers and
the two #4-40 screws securing the control board
to the end cap assembly and set aside.
3. Gently pry the switch panel from the end cap
assembly.
4 Remove any adhesive that remains on the end cap.
5. Remove the adhesive backing from the new switch
panel. Insert the ribbon connector through the slot
in the end cap and apply the switch panel to the end
cap.
6. Install the control board to the back side of the end
cap using the four #6 screws, nylon washers and
the two #4-40 screws to the end cap assembly.
NOTE: The four nylon washers must be installed
under the heads of the four #6 screws to prevent
a possible shorting of the control board circuits.
7. Reconnect the 11-pin connector from the switch
panel to the control board making sure every pin
on the control board is inserted into the ribbon
cable plug.
Test Procedures:
The test procedures for the switch panel and the
control board will vary depending upon the problems
experienced by the brewer. Refer to the Troubleshooting guide beginning on page 10. The troubleshooting
guide is divided into three sections, Refill Circuit,
Heating Circuit, and Brewing Circuit.
Page 24
29707 112801
SERVICE (cont.)
DISPENSE VALVE
6. Connect the voltmeter lead ends to the dispense
valve coil terminals. Connect the brewer to the
power source. Brewer temperature lockout must
be disabled. Place "ON/OFF" Switch in the "ON"
position. Press and release the brew switch. The
indication must be 120 volts ac.
7. Disconnect the brewer from the power source.
If voltage is present as described, but no coil action is
observed, nor "clicking" heard, dispense valve is defective. Replace valve and test again to verify repair.
OT
RE H
RFACES A
MERS AND SU
AR
W
:
N
O
I
T
U
A
C
If voltage is not present as described, refer to
Diagrams
and check the brewer wiring harness. Also
Wiring
check the control board for proper operation. See
Pages 22 and 23.
P1852
FIG. 4 DISPENSE VALVE
Location:
The dispense valve is located inside the top cover
behind the front end cap.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Check the water level in the tank to confirm that it
is within 1/2" from the top of the tank.
3. Connect the brewer to the power source. If the
brewer has been set for brewer temperature lockout, this feature must be disabled. See Page 9 for
procedure.
4. Check the dispense valve for coil action. Place the
ON/OFF switch in the "ON" position, press and
release the BREW switch. Listen carefully in the
vicinity of the dispense valve for a "clicking" sound
as the coil magnet attracts and repels the plunger.
5. Disconnect the brewer from the power source.
Removal and Replacement:
1. Disconnect wires from the dispense valve.
2. Drain enough water from the tank so the dispense
valve is above the water level.
3. Remove water lines from the dispense valve.
4. Remove the two #8-32 nuts securing the dispense
valve to the sprayhead panel.
5. Install a new dispense valve using the two #8-32
nuts.
6. Reconnect water lines to the dispense valve and
secure in place with clamps.
7. Refer to FIG. 5 when reconnecting wires.
WHI/GRN from
Control Board
WHI from Terminal
Block
If the sound is heard as described, there may be a
blockage in the dispense valve or the water line to the
sprayhead. Remove the dispense valve and inspect for
wear, and remove waterborne particles.
If the sound is not heard as described, proceed to #6.
Page 25
P1853
FIG. 5 DISPENSE VALVE WIRING
29707 112801
SERVICE (cont.)
LIMIT THERMOSTAT
Removal and Replacement:
1. Remove the black and blue wires from limit thermostat terminals.
2. Carefully slide the limit thermostat out from under
the retaining clip and remove limit thermostat.
3. Carefully slide the new limit thermostat into the
retaining clip.
4. Refer to FIG. 7 when reconnecting the wires.
T
RFACES ARE HO
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RS AN
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:
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U
A
C
P1854
BLU from Control
Board
FIG. 6 LIMIT THERMOSTAT
Location:
The limit thermostat is located inside the front
access panel on the front side of the tank.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Disconnect the blue and black wires from the limit
thermostat.
3. With an ohmmeter, check for continuity across the
limit thermostat terminals.
If continuity is present as described, the limit thermostat is operating properly.
If continuity is not present as described, replace the
limit thermostat.
BLK from Terminal
Block
P1800
FIG. 7 LIMIT THERMOSTAT WIRING
Page 26
29707 112801
SERVICE (cont.)
TANK HEATERS
Location:
The tank heaters are located inside the tank and
secured to the tank bottom.
DV models only Test Procedures :
1. Disconnect the brewer from the power source.
2. With a voltmeter, check voltage across the white
wire from the terminal block and black wire from
the control board. Connect brewer to the power
source. The indication must be 120 volts ac.
3. Disconnect the brewer from the power source.
4. Check voltage across the red wire from the terminal block and black wire from the control board.
Connect brewer to the power source. The indication must be 240 volts ac.
5. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #6
If voltage is not present as described, refer to the
Wiring Diagrams
and check wiring harness.
6. Disconnect the black and blue wires or the red and
brown wires from the tank heater terminals.
7. Check for continuity across tank heater terminals.
If continuity is present as described, reconnect the
wires, the tank heater is operating properly.
If continuity is not present as described, replace the
tank heater.
NOTE- If the tank heater remains unable to heat,
remove and inspect heater for cracks in the sheath.
MV models only Test Procedures:
1. Disconnect the brewer from the power source.
2. With a voltmeter, check voltage across the white
or red wire from the terminal block and black wire
from the control board. Connect brewer to the
power source. The indication must be 120 volts ac
for two wire 120 volt models or 208-240 volts ac
for three wire 120/208-240 volt models.
3. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #4
If voltage is not present as described, refer to the
Wiring Diagrams
and check wiring harness.
Page 27
P1890
FIG. 8 TANK HEATERS
4. Disconnect the black wire and the white wire or red
wire from the tank heater terminals.
5. Check for continuity across tank heater terminals.
If continuity is present as described, reconnect the
wires, the tank heater is operating properly.
If continuity is not present as described, replace the
tank heater.
NOTE- If the tank heater remains unable to heat,
remove and inspect heater for cracks in the sheath.
All models Removal and Replacement:
1. Remove the top cover or top warmer housing and
front access panel as previously described.
2. Disconnect the vent hose from the top of the tank
by pulling the elbow fitting from the grommet in
the top of the tank lid.
3. Drain water from the tank.
4. Disconnect the water supply tube to the dispense
valve from the side of the tank.
5. Disconnect the water supply tube to the solenoid
valve from the bottom of the tank.
6. On brewers with faucet, disconnect the outlet
water line to the faucet from the side of the tank.
7. Disconnect the temperature probe from the top of
the tank by pulling the probe from the grommet in
the top of the tank lid.
8. Disconnect the pink wire from the level probe.
9. Disconnect the green wire from the top of the tank.
10. Disconnect the limit thermostat from the side of
the tank.
29707 012502
SERVICE (cont.)
TANK HEATERS (cont.)
11. Disconnect the two white wires from the tank
warmer blanket.
12. Disconnect the black, white and blue wires from
the tank heater terminals. DV models only, disconnect the brown and red wires from tank heater
terminals.
13. Remove the four #8-32 nuts securing the tank to
the mounting brackets and remove the tank assembly.
14. Remove the eight #8-32 nuts securing the tank lid
to the tank.
15. Remove the two hex nuts securing the tank heater
to the bottom of the tank. Remove tank heater with
gaskets and discard.
16. Install new tank heater with gaskets to the bottom
of the tank and secure with two hex nuts.
17. Install tank assembly onto mounting brackets and
secure in place with four #8-32 nuts.
18. Install tank lid and secure in place with eight #8-32
nuts.
19. Connect the two white wires of the tank warmer
blanket.
20. Connect the limit thermostat to the front of the tank
assembly.
21. Connect the green wire to the tank mounting
bracket using #8-32 nut.
22. Connect the pink wire to the level probe.
23. Insert the temperature probe through the grommet in the tank lid.
24. Install the elbow fitting of the vent hose into the
grommet in the tank lid.
25. On brewers with faucet, connect the outlet water
line of the faucet to the side of the tank and secure
with clamp.
26. Connect the water supply tube from the solenoid
to the bottom of the tank and secure with clamp.
27. Connect the water supply tube from the dispense
valve to the side of the tank and secure with clamp.
28. DV models only - Refer to the
Wiring Diagrams
when reconnecting the tank heater wires.
MV models only - Refer to FIG. 9 when reconnecting the tank heater wires.
29. Install access panels and covers and refer to
Set-up
for refill and operation.
Initial
TANK HEATER TERMINAL BLOCK WIRING DIAGRAM
(CDBC-MV MODELS)
1800W @ 120V
B
L
K
WHITE
NEUTRAL
L1 BLACK
2390W @ 120/208V
1425W @ 120V
1800W
1425W
B
W
L
H
U
T
REDWHIBLK
120V A.C.
B
L
K
WHITE
NEUTRAL
L1 BLACK
B
L
U
1800W
1425W
W
H
T
REDWHIBLK BLK WHIRED
120V A.C.
3180W @ 120/240V
L2 REDL2 REDL2 RED
WHITE
NEUTRAL
L1 BLACK
or
B
B
L
K
W
L
H
U
T
120V A.C.
120V A.C.
1800W
1425W
208 or
240V A.C.
FIG. 9 TANK HEATER TO TERMINAL BLOCK WIRING
Page 28
P1888
29707 012502
SERVICE (cont.)
VOLTAGE SELECTOR SWITCH - DV models only
WARMERS AND SURFACES ARE HOT
:
N
O
I
T
U
A
C
P2503
FIG. 10 VOLTAGE SELECTOR SWITCH
7. Disconnect the white/violet wire from the selector
switch. With the selector switch in the 120/208240V position, check for continuity between the
center terminal and the white/violet wire terminal.
If continuity is present as described, the dual voltage
selector switch is operating properly.
If continuity is not present as described, replace the
dual voltage selector switch.
Removal and Replacement:
1. Disconnect the brewer from the power source.
2. Disconnect the three wires from the selector switch.
3. Remove the switch mounting nut from the under
side of component mounting bracket; remove
switch from bracket.
4. Install new switch in component mounting bracket
and secure with mounting nut.
5. Refer to FIG. 11 when reconnecting wires to the
switch.
Location:
The voltage selector switch is located on the
component mounting bracket behind the front
access panel.
Test Procedure:
1. Disconnect the brewer from the power source.
2. With the voltage selector switch in the 120V posi-
tion, connect a voltmeter between the black termi-
nal of the terminal block and the center terminal of
the selector switch.
3. Connect the brewer to the power source. The
indication must be 120 volts ac.
4. Move the voltage selector switch to the 120/208-
240V position, the indication must be 240 volts ac.
5. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #6.
If voltage is not present as described, refer to the
Wiring Diagrams
and check the brewer wiring har-
ness.
6. Disconnect the white and blue wires from the
selector switch. With the selector switch in the
120V position, check for continuity between the
two empty terminals of the switch.
Page 29
WHI/VIO to Tank Heater
Blue to Tank Heater
White to Terminal Block
P2504
FIG. 11 VOLTAGE SELECTOR
SWITCH TERMINALS
29707 050902
SERVICE (cont.)
REFILL VALVE
WARMERS AND SURFACES ARE HOT
:
N
O
I
T
U
A
C
P1857
FIG. 12 REFILL VALVE
Location:
The refill valve is located inside the trunk on the
lower center part of the component bracket.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Disconnect the white and white/blue wires from
the refill valve. Set the "ON/OFF" switch in the "ON"
upper position.
3. With a voltmeter, check the voltage across the coil
wires. Connect the brewer to the power source.
The indication must be 120 volts ac for two wire
120 volt models and three wire 120/208 and 120/
240 volt models.
4. Disconnect the brewer from the power source.
If continuity is not present as described, replace the
refill valve.
6. Check the refill valve for coil action. Connect the
brewer to the power source. With "ON/OFF" switch
in the "ON' upper position press start switch and
listen carefully in the vicinity of the refill valve for
a" clicking" sound as the coil magnet attracts.
7. Disconnect the brewer from the power source.
If the sound is heard as described and water will not
pass through the refill valve, there may be a blockage
in the water line before the refill valve or, the solenoid
valve may require inspection for wear, and removal of
waterborne particles.
If the sound is not heard as described, replace the refill
valve.
Removal and Replacement:
1. Remove both wires from the refill valve.
2. Turn off the water supply to the brewer and drain
the tank.
3. Disconnect the water lines to and from the refill
valve.
4. Remove the two 1/4"-20 screws securing the refill
valve mounting bracket to the component bracket.
Remove bracket and valve as an assembly.
5. Using two 1/4"-20 screws install the new refill
valve and bracket to the component bracket.
6. Securely fasten the water lines to and from the
valve.
7. Refer to FIG. 13 when reconnecting the wires.
8. Install access panels and covers and refer to
Set-up
for refill and operation.
Initial
If voltage is present as described, proceed to #5.
If voltage is not present as described, refer to
Diagrams
and check brewer wiring harness.
Wiring
5. Check for continuity across the refill valve coil
terminals.
If continuity is present as described, reconnect the
white and white/blue wires from the circuit board.
Page 30
WHI from Terminal
Block
WHI/BLU from
Control Board
FIG. 13 REFILL VALVE WIRING
P1858
29707 112801
SERVICE (cont.)
WARMER ELEMENT(S)
R
E
T
N
N
A
O
C
I
E
T
D
D
U
R
A
A
C
C
S
I
D
:
!
IF
FIG. 14 WARMER ELEMENTS
Location:
The warmer element(s) is located under the
warmer plate.
P1859
4. Check the continuity across the two terminals on
the warmer element.
If continuity is present as described, reconnect the two
wires to the warmer element.
If continuity is not present as described, replace the
warmer element.
Removal and Replacement:
1. Remove the three #4-40 screws securing the
warmer assembly to the brewer.
2. Lift the warmer assembly from the brewer.
3. Disconnect the two wires from the warmer element terminals.
4. Remove the two #8-32 nuts securing the warmer
element to the warmer plate.
5. Securely install new warmer element.
6. Reconnect the two wires to warmer element terminals.
7. Securely install warmer assembly on the brewer.
8. Refer to the
Wiring Diagrams
when reconnecting
the wires.
Test Procedures:
1. Disconnect the brewer from the power source.
2. With a voltmeter, check voltage across the two
wires at the warmer element with the "ON/OFF"
switch in the "ON" position. Connect the brewer to
the power source. The indication must be 120
volts ac for two wire 120 volt models and three
wire 120/208 and 120/240 volt models.
3. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #4.
If voltage is not present as described, refer to
Diagrams
and check brewer wiring harness.
Wiring
Page 31
29707 112801
SERVICE (cont.)
FUSE HOLDER/FUSE ASSEMBLY MV models only
J1
1
M
TR
2
TRM
J2
J3
J5
J4
J6
J7
RFACES ARE HOT
SU
ARMERS AND
W
:
N
IO
T
U
A
C
P1937
FIG. 15 FUSE HOLDER AND FUSE ASSEMBLY
Removal and Replacement:
1. Remove the cap from the holder.
2. Remove fuse from the fuse holder and discard.
3. Install new 20 amp fuse in the holder.
4. Reinstall fuse holder cap.
Location:
The fuse holder and fuse assembly is located on
the left rear side of the brewer.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Remove the cap from the fuse holder and remove
the fuse.
3. With an ohmmeter, check for continuity through
the fuse.
If continuity is present as described, reinstall the fuse,
the fuse is operating properly.
If continuity is not present as described, replace the
fuse.
Page 32
29707 112801
SERVICE (cont.)
THERMAL FUSES MV models only
J1
1
M
R
T
2
M
R
T
J2
J3
J5
J4
J6
J7
P1938
FIG. 16 THERMAL FUSES
Location:
The thermal fuses are included with the wiring
harness from the tank heater terminals to the terminal
block located inside the top cover.
Removal and Replacement:
1. Disconnect the thermal fuse wiring harness from
the right tank heater terminal tank heater terminal
block or the thermal fuse from the left tank heater
terminal and the tank heater terminal block.
2. Remove the wiring harness and discard.
3. Connect new wiring harness to right tank heater
terminal tank heater terminal block or the left thermal fuse to the left tank heater terminal and the tank
heater terminal block.
4. Refer to Fig. 16 when reconnecting the thermal fuse
wiring harness.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Disconnect the thermal fuse from the right tank
heater terminal and tank heater terminal block or
the thermal fuse from the left tank heater terminal
and the tank heater terminal block.
3. With an ohmmeter, check for continuity across the
thermal fuse terminals.
If continuity is present as described, the thermal fuse is
operating properly.
If continuity is not present as described, replace the
thermal fuse.
Page 33
29707 112801
SCHEMATIC WIRING DIAGRAM CDBC DV
L1
LIMIT
C
O
N
T
R
O
L
P
C
B
O
A
R
D
BLK
J1-1
J1-2
J1-1
J1-5
J1-10
J2-1
COM
N.O.
BLK-14
BLK
BLK
BLU-14
BLK-14
WHI
BLK
BRN/BLK
WHI/BLU
WHI/RED
YEL
WHI/VIO
VIO
WHI/GRN
BREW SW
THERMOSTAT
BLU-14
WHI
COUNTER
(OPTIONAL)
CONTROL PANEL ASSY
LT FRNT SW
BLK-14
"KEEP WARM" HEATER
LT REAR SW
GRN
TANK HEATER
1425W
BRN/BLK
VIO
YEL YEL
SELECTOR
SWITCH
BLU-14
WHI/VIO-14
WHI/RED
DISPENSE
WHI/GRN
P2
P3
P2
SOL
WARMER ASSY "A"
FRONT WARMER
BRN/BLK
(SEE TABLE BELOW FOR USAGE)
REAR WARMER
VIO
WARMER ASSY "B"
FRONT WARMER
WHI-14
TANK HEATER
1800W
BREW STATION WARMER
(CONTROLLED BY ON/OFF SW)
WHI/BLU
WHI
W
H
I
WHI
REFILL
SOL
P1
P1, P2, &
P3 ARE
PINS OF A
POLARIZED
THREE-PIN
CONNECTOR.
P1
RED-14
WHI
WHI
WHI
WHI
WHI
WHI
WHI
N L2
N L2
TOP REAR SW
RT FRNT SW
LEVEL
PROBE
J2-6
J2-11
J3-1
J3-4
PNK
GRN
WHI
BLK
ON/OFF SW
HIDDEN SW
STATIC
SHIELD
TOP FRNT SW
RT REAR SW
(NOTE – ALL WARMERS ARE NOT
AVAILABLE ON ALL MODELS!)
t°
29685.0002D 05/02 ©2001 BUNN-O-MATIC CORPORATION
WHI/VIO
(SEE TABLE BELOW FOR USAGE)
P3
WHI/VIO
(ALL CONFIGURATIONS INCLUDE BREW STATION WARMER)
WITH TOP WARMERS
WITH LEFT WARMERS
WITH RIGHT WARMERS
WITH LEFT & RIGHT WARMERS
WITH LEFT & TOP WARMERS
WITH RIGHT & TOP WARMERS
REAR WARMER
WARMER WIRING REFERENCE
W
H
I
LEFT
"B"
"B"
"B"
TOP
–
"A"
–
"A"
–
"A"
120V AC 2 WIRE
120/208V AC 3 WIRE
120/240V AC 3 WIRE
SINGLE PHASE
RIGHT
–
–
–
–
–
"A"
"A"
–
"B"
Page 34
29707 050902
SCHEMATIC WIRING DIAGRAM CDBC APS-DV
CDBCF APS/TC/LPTC-DV
L1
LIMIT
C
O
N
T
R
O
L
P
C
B
O
A
R
D
BLK
J1-1
J1-2
J1-1
J1-5
J1-10
J2-1
BLK-14
BLK
BLK
BLU-14
COM
BLK-14
N.O.
BLK
WHI/BLU
WHI/GRN
CONTROL PANEL ASSY
THERMOSTAT
BLU-14
WHI
COUNTER
(OPTIONAL)
BREW SW
BLK-14
"KEEP WARM" HEATER
WHI/BLU
GRN
TANK HEATER
1425W
REFILL
SOL
BLU-14
WHI/GRN
SELECTOR
SWITCH
DISPENSE
SOL
WHI-14
WHI/VIO-14
TANK HEATER
1800W
RED-14
WHI
WHIWHI
WHI
WHI
N L2
N L2
J2-6
J2-11
J3-1
J3-4
PNK
GRN
WHI
BLK
ON/OFF SW
HIDDEN SW
STATIC
SHIELD
120V AC 2 WIRE
120/208V AC 3 WIRE
LEVEL
PROBE
120/240V AC 3 WIRE
SINGLE PHASE
t°
29685.0003E 08/03 ©2001 BUNN-O-MATIC CORPORATION
Page 35
29707 080503
SCHEMATIC WIRING DIAGRAM CDBC MV
L1
GRN
N L2
N L2
C
O
N
T
R
O
L
P
C
B
O
A
R
D
BLK
J1-1
J1-2
J1-1
J1-5
J1-10
J2-1
COM
N.O.
20
AMP
BLU-14
WHI
WHI/BLU
WHI/RED
WHI/VIO
VIO
WHI/GRN
BLK-14BLK-14
BLK
BLK
BLK-14
BLK
BRN/BLK
YEL
LIMIT
THERMOSTAT
WHI
COUNTER
(OPTIONAL)
CONTROL PANEL ASSY
BREW SW
BLU-14
LT FRNT SW
"KEEP WARM" HEATER
LT REAR SW
THERMAL
WHI/GRN
BRN/BLK
P2
P3
VIO
P2
YEL YEL
TANK HEATER
FUSE
BLK-14
WHI/RED
DISPENSE
BRN/BLK
(SEE TABLE BELOW FOR USAGE)
VIO
BLU-14
TANK HEATER
BLK-14
BREW STATION WARMER
(CONTROLLED BY ON/OFF SW)
SOL
WARMER ASSY "A"
FRONT WARMER
REAR WARMER
WARMER ASSY "B"
FRONT WARMER
WHI-14
WHI/BLU
WHI
W
H
I
WHI
REFILL
SOL
P1
P1, P2, &
PINS OF A
POLARIZED
THREE-PIN
CONNECTOR.
P1
THERMAL
FUSE
RED-14
WHI-14
WHI
WHI
WHI
WHI
WHI
WHI
P3 ARE
WHI
TOP REAR SW
RT FRNT SW
LEVEL
PROBE
J2-6
J2-11
J3-1
J3-4
PNK
GRN
WHI
BLK
ON/OFF SW
HIDDEN SW
STATIC
SHIELD
TOP FRNT SW
RT REAR SW
(NOTE – ALL WARMERS ARE NOT
AVAILABLE ON ALL MODELS!)
t°
29685.0000A 4/99 ©1999 BUNN-O-MATIC CORPORATION
WHI/VIO
(SEE TABLE BELOW FOR USAGE)
P3
WHI/VIO
(ALL CONFIGURATIONS INCLUDE BREW STATION WARMER)
WITH TOP WARMERS
WITH LEFT WARMERS
WITH RIGHT WARMERS
WITH LEFT & RIGHT WARMERS
WITH LEFT & TOP WARMERS
WITH RIGHT & TOP WARMERS
REAR WARMER
WARMER WIRING REFERENCE
W
H
I
LEFT
–
"B"
–
"B"
"B"
–
120V AC 2 WIRE
120/208V AC 3 WIRE
120/240V AC 3 WIRE
SINGLE PHASE
TOP
"A"
–
–
–
"A"
"A"
RIGHT
–
–
"A"
"A"
–
"B"
Page 36
29707 112801
L1
C
O
N
T
R
O
L
P
C
B
O
A
R
D
BLK
J1-1
J1-2
J1-1
J1-5
J1-10
J2-1
SCHEMATIC WIRING DIAGRAM CDBC - APS MV
GRN
BLK-14BLK-14
20
AMP
WHI
BLK
BLK
BLU-14
COM
BLK-14
N.O.
WHI
BLK
WHI/BLU
WHI/GRN
CONTROL PANEL ASSY
BREW SW
LIMIT
THERMOSTAT
COUNTER
(OPTIONAL)
BLU-14
"KEEP WARM" HEATER
WHI/BLU
REFILL
SOL
WHI/GRN
THERMAL
FUSE
BLK-14
BLK-14
DISPENSE
SOL
TANK HEATER
BLU-14
TANK HEATER
WHI-14
THERMAL
FUSE
RED-14
WHI-14
WHI
WHI
WHI
WHI
N L2
N L2
J2-6
J2-11
J3-1
J3-4
PNK
GRN
WHI
BLK
ON/OFF SW
HIDDEN SW
STATIC
SHIELD
BLK
GRN
WHI
120V AC 2 WIRE
120/208V AC 3 WIRE
120/240V AC 3 WIRE
LEVEL
PROBE
29685.0001A 4/99 ©1999 BUNN-O-MATIC CORPORATION
t°
SINGLE PHASE
Page 37
29707 112801
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