CDBC, CDBCF
CDBC APS, CDBCF APS
CDBC TC, CDBCF TC
(Dual Voltage Models
Starting at Serial #CDBC024477)
DISCONTINUED VERSION
The information in this manual
is no longer current.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
29707.0001B 02/04 ©2003 Bunn-O-Matic Corporation
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, 15.0 A, 1800 W
1PH, 2-Wire, 60HZ
#29710.0005 (3 Warmers)
CDBC(F)-DV BREWERS
Optional Field Wiring
#00658.0000
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
#00831.0000
#29710.0007 (3 Warmers)
CDBC(F)-DV BREWERS
! CAUTION
Optional Field Wiring
120/208-240 V, 13.0-15.0 A, 2680-3550 W
1PH, 3-Wire, 60HZ
#34072.0000
#29710.0008
CDBC(F) APS-DV & TC-DV
BREWERS
29707.1 082803
Page 3
USER NOTICES (CONT.)
#02765.0000
#12364.0000
#00656.0000
29707.1 082803
Page 4
Models CDBC-DV, CDBC-APS DV & CDBCF TC-DV
ELECTRICAL REQUIREMENTS
CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up.
Requirements for brewers without an attached cord set are as follows:
120V VERSION
120/208-240V VERSION
Requires 2-wire,
groundedservice
rated120voltsac,
15 amp, single
phase, 60 Hz.
Requires 3-wire,
grounded service
rated 120/208-240
volts ac, 20 amp,
singlephase,60Hz.
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,
20AMPS.ThePowerSupplyCordmustbeatleast3feetlongandmaximum6feetlong(measuredfromStrain
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.
29707.1 082803
Page 5
PLUMBING REQUIREMENTS
These brewers must be connected to a cold water system with operating pressure between 20 and 90 psi (138
1
and620kPa)froma ⁄2"orlargersupplyline. Ashut-offvalveshouldbeinstalledinthelinebeforethebrewer. 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
1
inlet fitting is ⁄4" flare.
1
3
NOTE - Bunn-O-Matic recommends ⁄4" copper tubing for installations of less than 25 feet and ⁄8" for more than
1
25 feet from the ⁄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.
29707.1 021804
Page 6
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
thebrewstationwarmer,enablesthebrewcircuit,andenergizesthe
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.
29707.1 021004
Page 7
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.
Setting Brew Lockout
Thebrewerisfactorysetwiththebrewlockoutdisabled.Brewlockoutpreventsstartingabrewcycleiftheready
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"switchandthe"HIDDEN"switchbeneaththe"®"forfiveseconds, theentirebankoftemperatureindicators
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
29707.1 021804
Page 8
ADJUSTMENTS & OPTIONAL SETTINGS (CONT.)
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 Brew Volume Setup.
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. PressandholdtheOFF/ONbutton.Thebrewvalvewillturnonafter10seconds.Releasethebutton.Thisbegins
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. Thesprayisnowonagainandtheremainingontimesettinghasbegun. PresstheOFF/ONbuttonmomentarily
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
cyclesuntilthebrewvolumeofstep1iscomplete. PressingtheOFF/ONbuttonagainwillterminatethebrewing
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.
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.
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.
29707.1 021804
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, andrepairofelectricalequipmentshouldbeperformedonlybyqualifiedservicepersonnel.
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.
Theuseoftwowrenchesisrecommendedwheneverplumbingfittingsaretightenedorloosened. Thiswillhelp
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. Makesurethereisanyloninsulatingwasherundereachscrewheadthatholdsthecontrolboardtotheplastic
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.
29707.1 082803
Page 10
TROUBLESHOOTING (cont.)
REFILL CIRCUIT
PROBLEM
PROBABLE CAUSE
REMEDY
Will not fill or refill
1. Power off to brewer
Press OFF/ON switch on control
panel to determine if power is ON.
2. Water shut off
3. Display flashing
Make sure water is ON.
Brewer has shut down due to mal-
function (See Diagnostic Chart in
manual, Page 20, or under top lid of
brewer).
Make sure ON/OFF Switch is "ON"
and indicator is lit.
4. ON/OFF Switch
Remove the Level Probe and check
for lime deposit on tip. Clean and
reinstall.
5. Lime build up on Probe
Disconnect the brewer from the
power source and remove wires
from refill valve coil. Check for con-
tinuity 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
terminalsoftherefillsolenoid.Con-
nectthebrewertothepowersource.
Press the switch "ON". Within five
seconds, voltageshouldbepresent
at the solenoid terminals. If voltage
is not present, refer to the wiring
diagrams and check the wiring har-
ness.
6. Refill Valve or Control Board
29707.1 021804
Page 11
TROUBLESHOOTING (cont.)
REFILL CIRCUIT (cont.)
PROBLEM
PROBABLE CAUSE
REMEDY
Fill or refill does not shut "OFF" (ON/ 1. Lime build up on probe
OFF Switch "ON")
Remove Level Probe and check for
limedepositsontip.Cleanandrein-
stall.
2. Water Level Probe Sensing Sys-
tem
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.Pullthetemperatureprobe
up about an inch from the grom-
met. Check for continuity from the
outside surface of the temperature
probe and pin 4 of the plug, conti-
nuity 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
replacetherefillsolenoid.(Seepage
29)
Fill or refill does not shut "OFF" (ON/
OFF Switch "OFF")
1. Refill valve or control board
If water continuously flows out of
airventtube,disconnectthebrewer
from the power source. If water
flowdoesnotstop,repairorreplace
therefillsolenoid.Ifthevalvecloses
when power is removed, replace
the control board. (See page 22)
29707.1 082803
Page 12
TROUBLESHOOTING (cont.)
HEATING CIRCUIT
PROBLEM
PROBABLE CAUSE
REMEDY
Water does not heat to proper tem- 1. Display flashing
perature
Brewer has shut down due to mal-
function (See Diagnostic Chart in
manual, Page 20, or under top lid).
IMPORTANT: Make sure no tem-
perature tests are taken before the
ready light is "ON". Tank tempera-
ture must be stabilized before read-
ings are taken.
Remove temperature probe and
grommet. Look into hole on tank
lid. Water must be within one inch
from top of tank.
2. Water not touching temperature
probe
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.
3. Water Level Probe Sensing Sys-
tem
Remove the probe from the grom-
met and submerge in a water bath
of approximately 70°F(21°C). Con-
nectanohmmetertopins3and4of
theJ3connector.At60°F(16°C)the
readingshouldbe15.3k 2kOHMS,
at 70°F(21°C) the reading should
4. Temperature Probe
be 11.8k
2k OHMS, and at
80°F(27°C) the reading should be
9.3k 2k OHMS. If the probe is
withintheseparameters, reconnect
the J3 plug to the control board.
5. Limit Thermostat
Disconnect the brewer from the
power source. Check for continuity
across the limit thermostat termi-
nals. Continuity should be present.
If not replace the limit thermostat.
(See page 25)
29707.1 082803
Page 13
TROUBLESHOOTING (cont.)
HEATING CIRCUIT (cont.)
PROBLEM
PROBABLE CAUSE
REMEDY
Water does not heat to proper tem- 6. Tank Heater
perature (cont.)
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
lowOHMreading.Ifnocontinuityis
present, check for a wiring prob-
lem, then replace the tank heater if
no wiring problem is found. (See
page 26)
IMPORTANT: Make sure no tem-
perature tests are taken before the
ready light is "ON". Tank tempera-
ture must be stabilized before read-
ings are taken.
29707.1 082803
Page 14
TROUBLESHOOTING (cont.)
HEATING CIRCUIT (cont.)
PROBLEM
PROBABLE CAUSE
REMEDY
Spitting or excessive steaming 1. Lime build up on temperature Inspect probe and tank assembly
(cont.)
probe, tank or tank heater
for excessive lime deposits. Delime
as required.
2. Temperature Probe
Remove the probe from the grom-
met and submerge in a water bath
of approximately 70°F(21°C). Con-
nectanohmmetertopins3and4of
theJ3connector.At60°F(16°C)the
readingshouldbe15.3k 2kOHMS,
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
withintheseparameters, reconnect
the J3 plug to the control board.
3. Control Board
Setthetemperatureto200°F(93°C).
Let tank temperature stabilize. If
temperature in tank is above tem-
perature setting by more than 7°F,
replacethecontrolboard.(Seepage
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 in-
sideoftankwithadelimingagent, if
necessary.
29707.1 082803
Page 15
TROUBLESHOOTING (cont.)
BREWING CIRCUIT
PROBLEM
PROBABLE CAUSE
1. Display flashing
REMEDY
Brew cycle will not start
Brewer has shut down due to mal-
function (See Diagnostic Chart in
manual, Page 20, or under top lid of
brewer).
Waterlinesandvalvestothebrewer
must be open.
2. No water
Check for voltage across the termi-
nals at the terminal block.
3. No power or incorrect voltage to
the brewer
The indicator lamp must be lit
4. ON/OFF switch not in the "ON"
position
Allow brewer to heat until ready
lamp is lit, or disable the brew lock-
out feature. (See page 8 & 9)
5. Low water temperature (Brew
lockout is enabled)
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.
6. Water not touching refill probe
inside tank
Disconnect the brewer from the
power source. Disconnect the rib-
bon connector from the control
board.Checkforcontinuitybetween
pins1&2(Anarrowontheconnec-
tor indicates pin 1). No continuity
should be present. Press the BREW
switch.Continuityshouldbepresent
for as long as the switch is held
down. If no continuity is present,
replace the switch membrane de-
cal. (See page 23)
7. Switch panel
29707.1 082803
Page 16
TROUBLESHOOTING (cont.)
BREWING CIRCUIT (cont.)
PROBLEM
PROBABLE CAUSE
REMEDY
Brew cycle will not start (cont.)
8. Control board or dispense valve
Iftheswitchpanelisoperatingprop-
erly, 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 har-
ness.Ifvoltageispresent,checkfor
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.
Consistently low beverage level in 1. Brew volume
Set up brewer according to instruc-
thedispenserorbeverageoverflows NOTE: Volume adjustments must tions in section Adjustments-Brew
dispenser
be made with sprayhead installed.
Volumes. (Seepage8)Usingastop
watch or second hand, time the
length of the brew cycle. Record
thistimeinsidethetoplid. Ifservice
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 de-
posits. Delime as required.
Remove dispense valve and clear
any obstructions. Rebuild or re-
place valve if necessary. (See page
24)
29707.1 082803
Page 17
TROUBLESHOOTING (cont.)
BREWING CIRCUIT (cont.)
PROBLEM
PROBABLE CAUSE
1. Lime build up
REMEDY
Dripping from sprayhead
Inspect the tank assembly for ex-
cessive lime deposits. Delime as
required.
2. Dispense valve
Removethedispensevalveandclear
any obstructions. Rebuild or re-
place the valve if necessary. (See
page 24)
Weak beverage
1. Sprayhead
Acleansprayheadmustbeusedfor
proper extraction.
2. Water temperature
Place an empty brew funnel on an
empty decanter beneath the spray-
head. Initiate brew cycle and check
the water temperature immediately
below the sprayhead with a ther-
mometer. The reading must not be
less than 195°F (91°C). Adjust the
temperature setting to increase the
water temperature. Refer to Initial
Set-up instructions.
BUNN® paper filters must be used
for proper extraction.
3. Filter type
4. Coffee grind
5. Funnel loading
Afinedriporgrindmustbeusedfor
proper extraction.
The BUNN® paper filter must be
centered in the funnel and the bed
of grounds leveled by shaking gen-
tly.
29707.1 082803
Page 18
TROUBLESHOOTING (cont.)
BREWING CIRCUIT (cont.)
PROBLEM
PROBABLE CAUSE
REMEDY
Dry coffee grounds remain in the 1. Sprayhead
funnel
Makesuresprayheadispresentand
holes are clear and unobstructed.
(See Weak Beverage Page 18)
2. Funnel loading
The BUNN® paper filter must be
centered in the funnel and the bed
of grounds leveled by shaking gen-
tly.
1. Warmer
Disconnect the brewer from the
power source. Remove the warmer
plate and turn upside down to ex-
posethewarmerterminals.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.Voltageshouldbepresentatthe
terminals. If not, disconnect power
supplyandcheckwiringandswitch.
Low beverage serving temperature
29707.1 082803
Page 19
DIAGNOSTICS
Intermittentflashingofthebankoftemperatureindicators, indicatesthatafaultexists. Countthenumberofflashes
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 -
Level probe dry for 7 minutes after fill valve is energized
Water pressure (Is water shut "OFF"?)
Level probe wiring
Temperature probe wiring
Fill valve wiring, function, & strainer
3
4
Low Water Temperature Fault -
Sensor in tank is calling for heat for 30 minutes or more
Tank heater wiring & function
Temperature probe wiring
Tank Sensor Disagreement -
Level probe detects water, but dry plug-in probe dry
Temperature probe wiring
Level probe wiring
Green wire between tank and circuit board
5
6
Temp Sensor Out-of-Range - High
Temp Sensor Out-of-Range - Low
Sensor not connected to circuit board
Sensor wires shorted together or to chassis
29707.1 082803
Page 20
SERVICE
This section provides procedures for testing and
replacing various major components used in this
brewer should service become necessary. Refer to
Troubleshooting for assistance in determining the
cause of any problem.
WARNING - Inspection, testing, and repair of electri-
cal equipment should be performed only by qualified
service personnel. The brewer should be unplugged
when servicing, except when electrical tests are re-
quired and the test procedure specifically states to
plug in the brewer.
.
R
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TS
E
N
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TE
IS
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19
-
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85
F
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R
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A
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8
5
6
:
N
P
COMPONENT ACCESS
WARNING - Disconnect the brewer from the power
source before the removal of any panel or the replace-
ment of any component.
All components are accessible by the removal of
the top cover or warmer housing, front access panel
and warmer plate(s).
The top cover is attached with one #4-40 screw.
D
S
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F
A
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E
S
A
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E
H
O
T
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
Wiring Diagrams............................................... 31
/
B
MANUFAC
TURED BY -I
SPRINGFIELD, ILLII...
MODEL
VOLTS A.C.
PHASE
AMP
WA
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WIRE
COVERED UNDER ONE OR MOREOF THE I
ONE OR MORE OTHE
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P1889
FIG. 1 COMPONENT ACCESS
29707.1 082803
Page 21
SERVICE (cont.)
CONTROL BOARD
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 wash-
ers 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 #4-
40 screws to the end cap assembly.
E
HOT
R
S
A
E
AC
F
D
SUR
N
A
S
R
E
RM
A
W
UTION
:
CA
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.
P1846
FIG. 2 CONTROL BOARD
7. Connect the 10-pin connector and the 4-pin con-
nector from the main wiring harness.
8. Connectthebluewireandblackwiretotherelayon
the control board.
Location:
The Control Board is located inside the top cover
behind the front end cap.
9. Refer to Adjustments and Optional Settings (See
page 9) to program the new control board.
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
threesections,RefillCircuit,HeatingCircuit,andBrew-
ing Circuit.
29707.1 082803
Page 22
SERVICE (cont.)
SWITCH PANEL
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 Removeanyadhesivethatremainsontheendcap.
5. Removetheadhesivebackingfromthenewswitch
panel. Inserttheribbonconnectorthroughtheslot
intheendcapandapplytheswitchpaneltotheend
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.
P1848
FIG. 3 SWITCH PANEL
Location:
The Switch Panel is located in the front of the
hood.
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 Troubleshoot-
ing guide beginning on page 10. The troubleshooting
guide is divided into three sections, Refill Circuit,
Heating Circuit, and Brewing Circuit.
29707.1 082803
Page 23
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 de-
fective. Replace valve and test again to verify repair.
If voltage is not present as described, refer to Wiring
Diagrams and check the brewer wiring harness. Also
check the control board and switch panel for proper
operation. (See Pages 22 and 23.)
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CAUTION
:
P1852
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.
FIG. 4 DISPENSE VALVE
Location:
The dispense valve is located inside the top cover
behind the front end cap.
Test Procedures:
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.
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 lock-
out, 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.
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. Removethedispensevalveandinspectfor
wear, and remove waterborne particles.
P1853
FIG. 5 DISPENSE VALVE WIRING
If the sound is not heard as described, proceed to #6.
29707.1 082803
Page 24
SERVICE (cont.)
LIMIT THERMOSTAT
Removal and Replacement:
1. Remove the black and blue wires from limit ther-
mostat 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.
BLU from Control
Board
P1854
FIG. 6 LIMIT THERMOSTAT
BLK from Terminal
Block
P1800
Location:
FIG. 7 LIMIT THERMOSTAT WIRING
The limit thermostat is located inside the top
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. Withanohmmeter,checkforcontinuityacrossthe
limit thermostat terminals.
If continuity is present as described, the limit thermo-
stat is operating properly.
If continuity is not present as described, replace the
limit thermostat.
29707.1 082803
Page 25
SERVICE (cont.)
TANK HEATERS
Location:
The tank heaters are located inside the tank and
secured to the tank bottom.
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
powersource. Theindicationmustbe120voltsac
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.
4. Check voltage across the red wire from the termi-
nal block and black wire from the control board.
Connect brewer to the power source. The indica-
tion must be 208 or 240 volts ac.
P1890
FIG. 8 TANK HEATERS
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. Disconnectthegreenwirefromthetopofthetank.
10. Disconnect the limit thermostat from the side of
the tank.
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
white/violet wires from the tank heater terminals.
7. Check for continuity across tank heater terminals.
11. Disconnect the two white wires from the tank
warmer blanket.
12. Disconnect the black, blue, white/violet 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 as-
sembly.
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.
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.
NOTE- If the tank heater remains unable to heat,
remove and inspect heater for cracks in the sheath.
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.
16. Install new tank heater(s) 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.
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
19. Connect the two white wires of the tank warmer
blanket.
29707.1 082803
Page 26
SERVICE (cont.)
TANK HEATERS (cont.)
20. Connectthelimitthermostattothefrontofthetank
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 grom-
met 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
valvetothesideofthetankandsecurewithclamp.
28. Refer to the Wiring Diagrams when reconnecting
the tank heater wires.
29. Install access panels and covers and refer to Initial
Set-up for refill and operation.
29707.1 082803
Page 27
SERVICE (cont.)
VOLTAGE SELECTOR SWITCH
If continuity is not present as described, replace the
voltage selector switch.
Removal and Replacement:
1. Disconnect the brewer from the power source.
2. Disconnectthethreewiresfromtheselectorswitch.
3. Remove the switch mounting nut from the under
side of component mounting bracket; remove
switch from bracket.
4. Installnewswitchincomponentmountingbracket
and secure with mounting nut.
5. Refer to FIG. 10 when reconnecting wires to the
switch.
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CAUTION
:
P2503
FIG. 9 VOLTAGE SELECTOR SWITCH
Location:
The voltage selector switch is located on the
component mounting bracket behind the front
access panel.
Test Procedure:
WHI/VIO to Tank Heater
Blue to Tank Heater
1. Disconnect the brewer from the power source.
2. 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.
White to Terminal Block
If continuity is present as described, reconnect the
white wire and continue to Step 3.
If continuity is not present as described, replace the
voltage selector switch.
3. With the selector switch in the 120/208-240V
position, disconnect the white/violet wire from the
selector switch. check for continuity between the
two empty terminals.
P2504
FIG. 10 VOLTAGE SELECTOR
SWITCH TERMINALS
If continuity is present as described, the voltage selec-
tor switch is operating properly.
29707.1 082803
Page 28
SERVICE (cont.)
REFILL VALVE
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.
OT
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CAUTION
:
Ifthe soundis notheardas described, replacetherefill
valve.
P1857
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
valvemountingbracket tothecomponentbracket.
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.
FIG. 11 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.
7. Refer to FIG. 12 when reconnecting the wires.
8. Install access panels and covers and refer to Initial
Set-up for refill and operation.
4. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #5.
If voltage is not present as described, refer to Wiring
Diagrams and check brewer wiring harness.
WHI from Terminal
Block
5. Check for continuity across the refill valve coil
terminals.
WHI/BLU from
Control Board
If continuity is present as described, reconnect the
white and white/blue wires from the circuit board.
P1858
FIG. 12 REFILL VALVE WIRING
29707.1 082803
Page 29
SERVICE (cont.)
WARMER ELEMENT(S)
4. Check the continuity across the two terminals on
the warmer element.
Ifcontinuityispresentasdescribed, reconnectthetwo
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 ele-
ment terminals.
4. Remove the two #8-32 nuts securing the warmer
element to the warmer plate.
5. Securely install new warmer element.
6. Reconnectthetwowirestowarmerelementtermi-
nals.
7. Securely install warmer assembly on the brewer.
8. Refer to the Wiring Diagrams when reconnecting
the wires.
P1859
FIG. 13 WARMER ELEMENTS
Location:
The warmer element(s) is located under the
warmer plate.
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 Wiring
Diagrams and check brewer wiring harness.
29707.1 082803
Page 30
SCHEMATIC WIRING DIAGRAM CDBC DV
L1
N
L22
GRN
SELECTOR
SWITCH
LIMIT
THERMOSTAT
WHI-14
TANK HEATER
1425W
BLU-14
BLK-14
TANK HEATER
2268W
BLU-14
BLK-14
WHI/VIO-14
RED-14
WHI
"KEEP WARM" HEATER
WHI
BREW STATION WARMER
(CONTROLLED BY ON/OFF SW)
BLK
WHI/RED
WHI
WHI
COUNTER
(OPTIONAL)
REFILL
SOL
BLK
BLK
BLU-14
BLK-14
WHI/BLU
J1-1
J1-2
DISPENSE
SOL
C
O
N
T
R
O
L
WHI
WHI
WHI/GRN
P2
COM
N.O.
WHI
BLK
J1-1
WARMER ASSY "A"
FRONT WARMER
P1
BRN/BLK
BRN/BLK
BRN/BLK
WHI
WHI
P
C
WHI/BLU
WHI/RED
YEL
J1-5
W
H
I
P1, P2, &
P3 ARE
PINS OF A
POLARIZED
THREE-PIN
CONNECTOR.
(SEE TABLE BELOW FOR USAGE)
WHI/VIO
B
O
A
R
D
P3
REAR WARMER
VIO
VIO
YEL
VIO
WHI/GRN
J1-10
J2-1
WARMER ASSY "B"
CONTROL PANEL ASSY
BREW SW
LT FRNT SW LT REAR SW
P2
P1
FRONT WARMER
YEL
WHI
WHI
(SEE TABLE BELOW FOR USAGE)
ON/OFF SW TOP FRNT SW TOP REAR SW
HIDDEN SW RT REAR SW RT FRNT SW
W
H
I
REAR WARMER
WHI/VIO
P3
WHI/VIO
J2-6
WARMER WIRING REFERENCE
(ALL CONFIGURATIONS INCLUDE BREW STATION WARMER)
LEFT
–
"B"
–
"B"
"B"
–
TOP
"A"
–
–
–
"A"
"A"
RIGHT
–
–
"A"
"A"
–
(NOTE – ALL WARMERS ARE NOT
AVAILABLE ON ALL MODELS!)
STATIC
SHIELD
WITH TOP WARMERS
WITH LEFT WARMERS
WITH RIGHT WARMERS
WITH LEFT & RIGHT WARMERS
WITH LEFT & TOP WARMERS
WITH RIGHT & TOP WARMERS
J2-11
J3-1
PNK
GRN
WHI
BLK
LEVEL
PROBE
"B"
J3-4
J5-1
BLK
120V AC 2 WIRE
120/208V AC 3 WIRE
120/240V AC 3 WIRE
SINGLE PHASE
t°
29707.1 021804
Page 31
SCHEMATIC WIRING DIAGRAM CDBC APS-DV
CDBCF APS/TC/LPTC-DV
L1
N
L22
GRN
SELECTOR
SWITCH
LIMIT
THERMOSTAT
WHI-14
TANK HEATER
1425W
BLK-14
BLU-14
TANK HEATER
2268W
BLU-14
BLK-14
WHI/VIO-14
RED-14
WHI
"KEEP WARM" HEATER
WHI
BLK
COUNTER
(OPTIONAL)
BLK
BLK
BLU-14
BLK-14
WHI
BLK
J1-1
J1-2
C
O
N
T
R
O
L
COM
N.O.
WHI
WHI
J1-1
REFILL
P
C
WHI/BLU
WHI/BLU
SOL
J1-5
B
O
A
R
D
DISPENSE
SOL
WHI
WHI/GRN
WHI/GRN
J1-10
J2-1
CONTROL PANEL ASSY
BREW SW
ON/OFF SW
HIDDEN SW
J2-6
STATIC
SHIELD
J2-11
J3-1
PNK
GRN
WHI
120V AC 2 WIRE
120/208V AC 3 WIRE
120/240V AC 3 WIRE
SINGLE PHASE
LEVEL
PROBE
BLK
J3-4
J5-1
BLK
t°
29707.1 021804
Page 32
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