Bunn Coffeemaker CDBCF APS DV User Manual

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  
is no longer current.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  
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  
1PH, 2-Wire, 60HZ  
or  
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  
#00658.0000  
120 V, 18.0 A, 2150 W  
1PH, 2-Wire, 60HZ  
or  
120/208-240 V, 14.4-16.2 A, 2740-3530 W  
1PH, 3-Wire, 60HZ  
#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  
#00831.0000  
#29710.0003 (DV models only)  
THREE WARMER BREWERS  
! CAUTION  
Optional Field Wiring  
120/208-240 V, 12-13.7 A, 2440-3230 W  
1PH, 3-Wire, 60HZ  
#34072.0000  
#29710.0004 (DV models only)  
APS BREWERS  
29707 080503  
Page 3  
USER NOTICES (CONT.)  
Optional Field Wiring  
Optional Field Wiring  
120/208-240 V, 15.6-17.5 A, 2980-3850 W  
1PH, 3-Wire, 60HZ  
120 V, 15.0 A, 1800 W  
1PH, 2-Wire, 60HZ  
#29710.0005 (DV models only)  
CDBCF-DV BREWERS  
#29710.0007 (DV models only)  
NO WARMER BREWERS  
Optional Field Wiring  
Optional Field Wiring  
120 V, 16.2 A, 1950 W  
1PH, 2-Wire, 60HZ  
120/208-240 V, 13.0-15.0 A, 2680-3550 W  
1PH, 3-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  
#29710.0008 (DV models only)  
CDBC LPTC-DV BREWERS  
#02765.0000  
#12364.0000  
#00656.0000  
29707 080503  
Page 4  
Models CDBC-DV, CDBC-APS DV & CDBCF LPTC-DV  
ELECTRICAL REQUIREMENTS  
CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up.  
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  
Requires 2-wire,  
groundedservice  
rated120voltsac,  
15 amp, single  
phase, 60 Hz.  
Requires 3-wire,  
grounded service  
rated120/240volts  
ac, 20 amp, single  
phase, 60 Hz.  
ELECTRICAL HOOK-UP  
CAUTION Improperelectricalinstallationwilldamageelectroniccomponents. Thetoggleswitchissetto 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. Ifre-wiringthemachineforoperationon120/208or120/240voltswithaPowerSupplyCord,thereplacement  
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.  
29707 080503  
Page 5  
Models CDBC-MV & CDBC-APS MV  
ELECTRICAL REQUIREMENTS  
CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up.  
TANK HEATER TERMINAL BLOCK WIRING DIAGRAM  
(CDBC-MV MODELS)  
2390W @ 120/208V  
or  
1800W @ 120V  
1425W @ 120V  
3180W @ 120/240V  
1800W  
1800W  
1425W  
1800W  
1425W  
1425W  
B
L
K
B
L
U
B
L
K
B
L
U
B
L
K
B
L
U
W
H
T
W
H
T
W
H
T
BLK  
WHI RED  
BLK WHI RED  
BLK RED  
WHI  
L2 RED  
L2 RED  
L2 RED  
120V A.C.  
WHITE  
WHITE  
WHITE  
208 or  
240V A.C.  
120V A.C.  
NEUTRAL  
NEUTRAL  
NEUTRAL  
120V A.C.  
120V A.C.  
L1 BLACK  
L1 BLACK  
L1 BLACK  
FIELD WIRING TERMINAL BLOCK DIAGRAM  
P1888  
1800W VERSION  
Requires 2-wire,  
grounded service  
rated 120 volts ac,  
20 amp, single  
phase, 60 Hz.  
1425W VERSION  
Requires 2-wire,  
groundedservice  
rated120voltsac,  
15 amp, single  
phase, 60 Hz.  
2390W VERSION  
Requires 3-wire,  
grounded service  
rated120/208volts  
ac, 20 amp, single  
phase, 60 Hz.  
3180W VERSION  
Requires 3-wire,  
grounded service  
rated120/240volts  
ac, 20 amp, single  
phase, 60 Hz.  
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.  
29707 112801  
Page 6  
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. 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.  
29707 112801  
Page 7  
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.  
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.  
29707 112801  
Page 8  
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  
willglow. Releasebothswitches. Pressingandreleasingthe"ON/OFF"switchwilltogglebetweenturningtheentire  
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  
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).  
29707 112801  
Page 9  
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  
untilyouhearthesolenoidclickon-and-offthreetimes(approximately5seconds),thenreleasethe"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.  
29707 102803  
Page 10  
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 112801  
Page 11  
TROUBLESHOOTING (cont.)  
REFILL CIRCUIT  
PROBLEM  
PROBABLE CAUSE  
REMEDY  
Will not fill or refill  
1. Power off to brewer  
Press warmer switches 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 112801  
Page 12  
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 112801  
Page 13  
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  
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.  
4. Temperature Probe  
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 112801  
Page 14  
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.  
7. Fuse Holder & Fuse (MV models Check fuse and replace if neces-  
only) sary. (See page 31)  
8. Thermal Fuse (MV models only) Check thermal fuse for continuity  
and replace if necessary. (See page  
32)  
29707 112801  
Page 15  
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.  
29707112801  
Page 16  
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)  
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 112801  
Page 17  
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 tionsinsection 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 112801  
Page 18  
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  
Asix-holestainlesssteelsprayhead  
must be used for 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 112801  
Page 19  
TROUBLESHOOTING (cont.)  
BREWING CIRCUIT (cont.)  
PROBLEM  
PROBABLE CAUSE  
REMEDY  
Dry coffee grounds remain in the 1. Sprayhead  
funnel  
Makesuresprayheadispresentand  
holes are clear and unobstructed.  
There should be six separate  
streams of water coming out of the  
sprayhead.  
2. Funnel loading  
The BUNN® paper filter must be  
centered in the funnel and the bed  
of grounds leveled by shaking gen-  
tly.  
Low beverage serving temperature 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.  
29707 112801  
Page 20  
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 112801  
Page 21  
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
O
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S
L
T
E
N
KS  
TE  
IS  
N
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Y
CO  
E
T
L
ATIC CORPI
L
O
P
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E
M
O
N
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N
BUNN  
1985  
C
U
F
O
T
E
AR  
UR  
AIL  
F
658  
PN:  
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.  
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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P1889  
FIG. 1 COMPONENT ACCESS  
29707 112801  
Page 22  
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.  
T
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CES AR  
S
AND SURFA  
RMER  
A
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:
N
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T
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C
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 112801  
Page 23  
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 112801  
Page 24  
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 for proper operation. See  
Pages 22 and 23.  
OT  
RE  
H
RFACES  
A
MERS AND SU  
AR  
W
:
N
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U
A
C
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 112801  
Page 25  
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.  
T
RFACES ARE HO  
D
SU  
RS AN  
ARME  
BLU from Control  
Board  
W
:
N
IO  
T
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A
C
P1854  
FIG. 6 LIMIT THERMOSTAT  
BLK from Terminal  
Block  
P1800  
Location:  
FIG. 7 LIMIT THERMOSTAT WIRING  
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. 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 112801  
Page 26  
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 termi-  
nal block and black wire from the control board.  
Connect brewer to the power source. The indica-  
tion must be 240 volts ac.  
P1890  
FIG. 8 TANK HEATERS  
4. Disconnecttheblackwireandthewhitewireorred  
wire from the tank heater terminals.  
5. Disconnect the brewer from the power source.  
5. Check for continuity across tank heater terminals.  
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.  
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.  
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.  
NOTE- If the tank heater remains unable to heat,  
remove and inspect heater for cracks in the sheath.  
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.  
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.  
NOTE- If the tank heater remains unable to heat,  
remove and inspect heater for cracks in the sheath.  
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.  
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  
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.  
8. Disconnect the pink wire from the level probe.  
9. Disconnectthegreenwirefromthetopofthetank.  
10. Disconnect the limit thermostat from the side of  
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.  
the tank.  
29707 012502  
Page 27  
SERVICE (cont.)  
TANK HEATERS (cont.)  
20. Connectthelimitthermostattothefrontofthetank  
assembly.  
11. Disconnect the two white wires from the tank  
warmer blanket.  
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.  
12. Disconnect the black, white and blue wires from  
the tank heater terminals. DV models only, dis-  
connect 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 as-  
sembly.  
25. On brewers with faucet, connect the outlet water  
line of the faucet to the side of the tank and secure  
with clamp.  
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.  
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. DV models only - Refer to the Wiring Diagrams  
when reconnecting the tank heater wires.  
MV models only - Refer to FIG. 9 when reconnect-  
ing the tank heater wires.  
29. Install access panels and covers and refer to Initial  
Set-up for refill and operation.  
19. Connect the two white wires of the tank warmer  
blanket.  
TANK HEATER TERMINAL BLOCK WIRING DIAGRAM  
(CDBC-MV MODELS)  
2390W @ 120/208V  
or  
1800W @ 120V  
1425W @ 120V  
3180W @ 120/240V  
1800W  
1800W  
1800W  
1425W  
1425W  
1425W  
B
L
K
B
L
U
B
L
K
B
L
U
B
L
K
B
L
U
W
H
T
W
H
T
W
H
T
BLK  
WHI RED  
BLK WHI RED  
BLK RED  
WHI  
L2 RED  
L2 RED  
L2 RED  
120V A.C.  
WHITE  
WHITE  
WHITE  
208 or  
240V A.C.  
120V A.C.  
NEUTRAL  
NEUTRAL  
NEUTRAL  
120V A.C.  
120V A.C.  
L1 BLACK  
L1 BLACK  
L1 BLACK  
P1888  
FIG. 9 TANK HEATER TO TERMINAL BLOCK WIRING  
Page 28  
29707 012502  
SERVICE (cont.)  
VOLTAGE SELECTOR SWITCH - DV models only  
7. Disconnect the white/violet wire from the selector  
switch. With the selector switch in the 120/208-  
240V 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. Disconnectthethreewiresfromtheselectorswitch.  
3. Remove the switch mounting nut from the under  
side of component mounting bracket; remove  
switch from bracket.  
WARMERS AND SARE HOT  
:
N
O
I
T
U
A
C
4. Installnewswitchincomponentmountingbracket  
and secure with mounting nut.  
5. Refer to FIG. 11 when reconnecting wires to the  
switch.  
P2503  
FIG. 10 VOLTAGE SELECTOR SWITCH  
Location:  
The voltage selector switch is located on the  
component mounting bracket behind the front  
access panel.  
WHI/VIO to Tank Heater  
Blue to Tank Heater  
White to Terminal Block  
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-  
240Vposition, theindicationmustbe240voltsac.  
5. Disconnect the brewer from the power source.  
P2504  
FIG. 11 VOLTAGE SELECTOR  
SWITCH TERMINALS  
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.  
29707 050902  
Page 29  
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.  
WARMERS AND SURE HOT  
:
N
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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. 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.  
7. Refer to FIG. 13 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. 13 REFILL VALVE WIRING  
29707 112801  
Page 30  
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. 14 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 112801  
Page 31  
SERVICE (cont.)  
Removal and Replacement:  
FUSE HOLDER/FUSE ASSEMBLY MV models only  
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.  
J1  
J2  
J3  
J5  
J4  
J6  
J7  
RFACES ARE HO
SU  
ARMERS AND  
W
:
N
IO  
T
U
A
C
P1937  
FIG. 15 FUSE HOLDER AND FUSE ASSEMBLY  
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.  
29707 112801  
Page 32  
SERVICE (cont.)  
THERMAL FUSES MV models only  
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 ther-  
mal fuse to the left tank heater terminal and the tank  
heater terminal block.  
J1  
1
J2  
J3  
J5  
J4  
J6  
J7  
4. RefertoFig.16whenreconnectingthethermalfuse  
wiring harness.  
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.  
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.  
29707 112801  
Page 33  
SCHEMATIC WIRING DIAGRAM CDBC DV  
L1  
N
L22  
GRN  
SELECTOR  
SWITCH  
LIMIT  
THERMOSTAT  
WHI-14  
TANK HEATER  
1425W  
BLU-14  
BLK-14  
TANK HEATER  
1800W  
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  
120V AC 2 WIRE  
120/208V AC 3 WIRE  
120/240V AC 3 WIRE  
SINGLE PHASE  
t°  
29707 050902  
Page 34  
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  
1800W  
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  
t°  
29707 080503  
Page 35  
SCHEMATIC WIRING DIAGRAM CDBC MV  
L1  
N
L22  
GRN  
TANK HEATER  
THERMAL  
THERMAL  
FUSE  
BLU-14  
FUSE  
TANK HEATER  
WHI-14  
BLK-14  
LIMIT  
THERMOSTAT  
BLU-14  
BLK-14  
BLK-14  
RED-14  
WHI-14  
20  
AMP  
BLK-14  
"KEEP WARM" HEATER  
WHI  
WHI  
BREW STATION WARMER  
(CONTROLLED BY ON/OFF SW)  
BLK  
WHI/RED  
WHI  
COUNTER  
(OPTIONAL)  
REFILL  
SOL  
WHI  
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  
WHI/VIO  
VIO  
J1-5  
W
H
I
P1, P2, &  
P3 ARE  
PINS OF A  
POLARIZED  
THREE-PIN  
CONNECTOR.  
(SEE TABLE BELOW FOR USAGE)  
B
O
A
R
D
P3  
REAR WARMER  
VIO  
VIO  
YEL  
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 RIGHT  
(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  
"A"  
J2-11  
J3-1  
"A"  
"A"  
"A"  
"A"  
PNK  
GRN  
WHI  
LEVEL  
PROBE  
"B"  
BLK  
J3-4  
120V AC 2 WIRE  
120/208V AC 3 WIRE  
120/240V AC 3 WIRE  
SINGLE PHASE  
t°  
29707 112801  
Page 36  
SCHEMATIC WIRING DIAGRAM CDBC - APS MV  
L1  
N
L22  
GRN  
LIMIT  
THERMOSTAT  
TANK HEATER  
THERMAL  
FUSE  
THERMAL  
FUSE  
BLU-14  
BLU-14  
BLK-14  
BLK-14  
20  
AMP  
TANK HEATER  
WHI-14  
WHI  
BLK-14  
BLK  
COUNTER  
(OPTIONAL)  
RED-14  
WHI-14  
BLK  
BLK  
BLU-14  
BLK-14  
J1-1  
J1-2  
"KEEP WARM" HEATER  
WHI  
C
O
N
T
R
O
L
COM  
N.O.  
BLK-14  
WHI  
WHI  
BLK  
J1-1  
REFILL  
SOL  
P
C
WHI  
WHI  
WHI/BLU  
WHI/BLU  
J1-5  
B
O
A
R
D
DISPENSE  
SOL  
WHI/GRN  
WHI/GRN  
J1-10  
J2-1  
CONTROL PANEL ASSY  
BREW SW  
BLK  
WHI  
ON/OFF SW  
HIDDEN SW  
GRN  
J2-6  
STATIC  
SHIELD  
120V AC 2 WIRE  
120/208V AC 3 WIRE  
120/240V AC 3 WIRE  
SINGLE PHASE  
J2-11  
J3-1  
PNK  
GRN  
WHI  
LEVEL  
PROBE  
BLK  
J3-4  
t°  
29707 112801  
Page 37  

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