Bunn Coffeemaker CDBC User Manual

CEZ, CEZF,  
CDBC, CDBCF  
Airpot,  
Thermal Carafe &  
Thermal Server Brewers  
DISCONTINUED VERSION  
The information in this manual  
is no longer current.  
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OPERATING & SERVICE MANUAL  
BUNN-O-MATIC CORPORATION  
POST OFFICE BOX 3227  
SPRINGFIELD, ILLINOIS 62708-3227  
PHONE: (217) 529-6601 FAX: (217) 529-6644  
29253.0000F 02/04 ©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.  
# 00986.0000  
# 00656.0000  
# 00658.0000  
# 10044.0000  
29253 011900  
Page 3  
ELECTRICAL REQUIREMENTS  
CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up.  
Model 15 has an attached cordset and requires 2-wire grounded service rated 120 volts ac, 15 amp, single  
phase, 60 Hz.  
L2 RED  
WHITE  
120V.A.C.  
WHITE  
NEUTRAL  
L1 BLACK  
120V.A.C.  
208 or 240V.A.C.  
120V.A.C.  
NEUTRAL  
L1 BLACK  
Model 20 requires 2-wire, grounded service rated  
Model 35 requires 3-wire, grounded service rated  
120 volts ac, 20 amp, single phase, 60 Hz. Proceed as 120/208 or 120/240 volts ac, 20 amp, single phase, 60  
follows:  
Hz. Proceed as follows:  
Electrical Hook-Up  
CAUTION – Improper electrical installation will damage electronic components.  
1. An electrician must provide electrical service as specified.  
2. Using a voltmeter, check the voltage and color coding of each conductor at the electrical source.  
3. Remove the front panel beneath the sprayhead.  
4. Feed the cord through the strain relief and connect it to the terminal block.  
5. Connect the brewer to the power source and verify the voltage at the terminal block before proceeding.  
Replace the front panel.  
6. If plumbing is to be hooked up later be sure the brewer is disconnected from the power source. If plumbing  
has been hooked up, the brewer is ready for Initial Set-Up.  
PLUMBING REQUIREMENTS  
These brewers must be connected to a cold water system with operating pressure between 5 and 90 psi (34.5  
1
and 620 kPa) for CDBC models and 20 and 90 psi (138 and 620 kPa) for CEZ models from a 2" or larger supply  
line. A shut-off valve should be installed in the line before the brewer. Install a regulator in the line when pressure  
3
is greater than 90 psi (620 kPa) to reduce it to 50 psi (345 kPa). The water inlet fitting is 8" flare. Bunn-O-Matic  
does not recommend the use of a reverse-osmosis or deionized water supply to this equipment.  
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 countertop. Bunn-O-Matic does not recommend the use of a saddle valve to install the brewer. The  
size and shape of the hole made in the supply line by this type of device may restrict water flow.  
This equipment must be installed to comply with the Basic Plumbing Code of the  
Building Officials and Code Administrators International, Inc. (BOCA)  
and the Food Service Sanitation Manual of the Food and Drug Administration (FDA).  
Plumbing Hook-Up  
1. Flush the water line.  
2. Securely attach it to the flare fitting at the rear of the brewer.  
3. Turn on the water supply.  
29253 091603  
Page 4  
OPERATING CONTROLS  
Model CEZ-APS/TS/TSR  
ON/OFF SWITCH  
Placing the "ON/OFF" switch in the "ON" upper position enables the  
brew circuit, and energizes the tank refill circuit. Placing the switch  
in the "OFF" lower position stops tank refilling and brewing. Stop-  
ping a brew cycle after it has been started will not stop the flow of  
water into the server until the funnel is empty.  
NOTE – Hot water will be available at the faucet in a limited amount  
when the switch is in the "OFF" position because the tank will not  
refill.  
P1910  
BREW SWITCH  
Momentarilypressingandreleasingtheswitchstartsabrewcyclewhenthe"ON/OFF"switchisinthe"ON"upper  
position.  
NOTE – The "ON/OFF" switch must be in the "ON" upper position to initiate and complete a brew cycle.  
READY INDICATOR  
This indicator glows when the preselected brew water temperature has been achieved.  
Model CDBC-APS/TC/TS/TSR  
ON/OFF SWITCH  
Pressing the "ON/OFF" switch (indicator glowing) enables the brew  
circuitandenergizesthetankrefillcircuit. Pressingtheswitchagain  
(indicator not glowing) stops tank refilling and brewing. Stopping a  
brewcycleafterithasbeenstartedwillnotstoptheflowofwaterinto  
the server until the funnel is empty.  
NOTE – Hot water will be available at the faucet in a limited amount  
whenthe"ON/OFF"indicatorisnotglowingbecausethetankwillnot  
refill.  
P1911  
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.  
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.  
29253 111103  
Page 5  
INITIAL SET-UP  
1. Insert an empty funnel into the funnel rails.  
2. Place an empty server under the funnel.  
3. Connect the brewer to the power source.  
4. Model CDBC-APS/TC/TS/TSR – Press the "ON/OFF" switch (indicator glowing).  
Model CEZ-APS/TS/TSR – Place the "ON/OFF" switch in the "ON" upper position.  
5. Water will flow into the tank and stop when the tank is filled to its capacity.  
6. Wait approximately twenty minutes for the water in the tank to heat to the proper temperature.  
7. Place a small vessel beneath the faucet and open the faucet handle. Release it when you hear the tank refilling.  
8. Model CDBC-APS/TC/TS/TSR – Press the "ON/OFF" switch (indicator glowing) then momentarily press and  
release the "BREW" switch.  
Model CEZ-APS/TS/TSR – Place the "ON/OFF" switch in the "ON" upper position then momentarily press and  
release the "BREW" switch.  
9. Allow the cycle to finish and measure the amount of water in the server. 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 server beneath the funnel.  
5. Model CDBC-APS/TC/TS/TSR – Press the "ON/OFF" switch (indicator glowing) then momentarily press and  
release the "BREW" switch.  
Model CEZ-APS/TC/TS/TSR – Place the "ON/OFF" switch in the "ON" upper position then momentarily press  
and release the "BREW" switch.  
6. When brewing is completed, simply discard the grounds and filter.  
CLEANING  
1. The use of a damp cloth rinsed in any mild, non-abrasive, liquid detergent is recommended for cleaning all  
surfaces on Bunn-O-Matic equipment.  
2. Check and clean the sprayhead. The sprayhead holes must always remain open.  
29253 111103  
Page 6  
CEZ-APS/TS/TSR ADJUSTMENTS & OPTIONAL SETTINGS  
IMPORTANT: The tank must be full and fill so-  
lenoid shut off prior to making these adjust-  
ments.  
Adjusting Brew Volumes  
Thebrewerisfactorysettodeliver64ounces  
2 for each brew cycle.  
BREWVOLUMESET-UP:Usethefollowingsteps  
whenthesettingisunknownoradifferentcircuit  
board is being installed.  
1. Place an empty funnel in the funnel rails and  
an empty server or graduated vessel be-  
neath the funnel.  
2. Place the "ON/OFF" switch in the "ON", upper  
position.  
3. Press and hold the brew start button until  
you hear the brew solenoid click on-and-off  
three times (approximately 5 seconds). Re-  
lease the button.  
P1864  
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 server or graduated vessel  
beneath the funnel. Place the "ON/OFF" switch in  
the "ON", upper position. Press and hold the  
"BREW" switch until you hear the solenoid click  
on-and-off three times (approximately 5 sec-  
onds), then release the "BREW" switch. Momen-  
tarily 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.  
P1865  
To decrease the amount of water for each  
brew cycle place an empty funnel in the funnel  
rails and an empty server or graduated vessel  
beneath the funnel. Place the "ON/OFF" switch  
in the "ON", upper position. 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 sec-  
onds), then release the "BREW" switch and al-  
low the cycle to finish.  
29253 071599  
Page 7  
CDBC-APS/TC/TS/TSR ADJUSTMENTS & OPTIONAL SETTINGS  
P1912  
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.  
IMPORTANT: The tank must be full and fill solenoid shut off prior to making these 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 server or graduated vessel beneath the funnel.  
2. Place the "ON/OFF" switch in the "ON", upper position.  
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  
server or graduated vessel beneath the funnel. Press the "ON/OFF" switch. Press and hold the "BREW" switch until  
you hear the solenoid click on-and-off three times (approximately 10 seconds), then release the "BREW" switch.  
Momentarily press and release the "BREW" switch once for each ounce (approximate) of water to be added to the  
prior setting and allow the brew cycle to finish.  
To decrease the amount of water for each brew cycle place an empty funnel in the funnel rails and an empty  
server or graduated vessel beneath the funnel. Press the "ON/OFF" switch. Momentarily press and release the  
"BREW" switch once for each ounce (approximate) of water to be removed from the existing setting. Press and  
hold the "BREW" switch until you hear the solenoid click on-and-off three times (approximately 10 seconds),  
then release the "BREW" switch and allow the cycle to finish.  
29253 111103  
Page 8  
CDBC-APS/TC/TS/TSR ADJUSTMENTS & OPTIONAL SETTINGS (cont)  
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.  
Pulse Brew Setup Procedure  
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.  
29253 111103  
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:  
A. Control Boards (CDBC-APS/TC/TS/TSR)  
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.  
B. Control Boards (CEZ-APS/TS/TSR)  
Locate J6 connector on control board. If jumper is across pins 1 & 2, board is set up to operate tea brewer or  
a brewer that DOES NOT use a water level probe. If jumper is across pins 2 & 3, board is set up to operate a  
coffee brewer or a brewer that uses a water level probe. Look at the bottom side of the control board. Pin 1 of  
connector J6 is marked by a square solder pad on the foil side of the board and pins 2,3 & 4 are marked by a  
round solder pad.  
C. Control Boards (CDBC-APS/TC/TS/TSR & CEZ-APS/TS/TSR)  
Make sure before servicing brewer that voltage is present at control board.  
On CDBC-APS/TC/TS/TSR models, observe if indicator light is glowing on the control panel. If so, proceed with  
testing. If not, check for voltage across pins 1 & 2 of the ten pin J1 connector (black and white wires). If voltage  
is present, replace the control board. If voltage is not present, check wiring and voltage across terminal block  
(black and white). Correct the problem and retest before proceeding with testing.  
On CEZ-APS/TS/TSR models, check for voltage across pins 1 & 7 of the eight pin J1 connector (black and white  
wires). If voltage is present, proceed with testing. If voltage is not present, check wiring and voltage across  
terminal block (black and white). Correct the problem and retest before proceeding with testing.  
29253 091603  
Page 10  
TROUBLESHOOTING (cont.)  
REFILL CIRCUIT  
PROBLEM  
PROBABLE CAUSE  
REMEDY  
Will not fill or refill  
1. Power off to brewer (CDBC-APS/ Press ON/OFF switch on control  
TC/TS/TSR & CEZ-APS/TS/TSR) panel to determine if power is ON.  
2. Water shut off (CDBC-APS/TC/ Make sure water is ON.  
TS/TSR & CEZ-APS/TS/TSR)  
3. Display flashing (CDBC-APS/TC/ Brewer has shut down due to  
TS/TSR) or ready light flashing malfunction (See Diagnostic Chart  
(CEZ-APS/TS/TSR)  
inmanual, Page19, orundertoplid  
of brewer).  
4. ON/OFF Switch (CDBC-APS/TC/ Make sure ON/OFF Switch is "ON"  
TS/TSR & CEZ-APS/TS/TSR) and indicator is lit.  
5. Lime build up on Probe (CDBC- Remove the Probe and check for  
APS/TC/TS/TSR & CEZ-APS/TS/  
TSR)  
lime deposit on tip. Clean and  
reinstall.  
Disconnect the brewer from the  
6. Refill Valve or Control Board power source and remove wires  
(CDBC-APS/TC/TS/TSR & CEZ- fromrefillvalvecoil. Checkforcon-  
APS/TS/TSR)  
tinuity across the terminals of the  
solenoid coil. If continuity is not  
present,replacetherefillvalve(See  
page 30). If continuity is present,  
thevalvemaybestuckclosed.Shut  
water off to brewer. Set the ON/OFF  
switch to the "OFF" position. Open  
the faucet and drain water down in  
thetankuntilflowstopsorslowsto  
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  
diagramsandcheckthewiringhar-  
ness.  
Reset the Water Sensing Thresh-  
7.Wateristooconductiveforproper oldAdjustmentProceduresonpage  
operation when using the factory 9.  
settingofsensingthreshold.(CDBC-  
APS/TC/TS/TSR)  
Fill or refill does not shut "OFF"  
(ON/OFF Switch "ON")  
Remove Probe and check for lime  
deposits on tip. Clean and reinstall.  
1. Lime build up on probe (CDBC-  
APS/TC/TS/TSR & CEZ-APS/TS/  
TSR)  
29253 111103  
Page 11  
TROUBLESHOOTING (cont.)  
REFILL CIRCUIT (cont.)  
PROBLEM  
PROBABLE CAUSE  
REMEDY  
Fill or refill does not shut "OFF" (ON/ 2a. Water Level Probe Sensing A) Disconnect the brewer from the  
OFF Switch "ON") (cont)  
System (CDBC-APS/TS/TSR)  
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  
upaboutaninchfromthegrommet.  
Check for continuity from the  
outside surface of the temperature  
probe and pin 4 of the plug,  
continuity should be present.  
Connect the J3 plug to the control  
board and proceed to step 3.  
2b.WaterLevelProbeSensingSys- B) Disconnect the brewer from the  
tem (CEZ-APS/TC/TS/TSR)  
power source. Disconnect the J5  
connector from the control board.  
Check for continuity from the nut  
on top of the level probe to pin 5 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 2 of the plug, conti-  
nuity should be present. Connect  
the J5 plug to the control board and  
proceed to step 3.  
3. Refill valve or control board Press ON/OFF switch to "ON" (Indi-  
(CDBC-APS/TC/TS/TSR & CEZ- cator lamp should be lit). If water  
APS/TS/TSR)  
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  
30)  
4.Wateristooconductiveforproper Reset the Water Sensing Threshold  
operation when using the factory Adjustment Procedures on page 9.  
settingofsensingthreshold.(CDBC-  
APS/TC/TS/TSR)  
Fill or refill does not shut "OFF" (ON/ 1. Refill valve or control board If water continuously flows out of  
OFF Switch "OFF") (CDBC-APS/TC/TS/TSR & CEZ- airventtube,disconnectthebrewer  
APS/TS/TSR)  
from the power source. If water  
flowdoesnotstop,repairorreplace  
therefillsolenoid.Ifthevalvecloses  
when power is removed, replace  
the control board. (See pages 21 &  
22)  
29253 111103  
Page 12  
TROUBLESHOOTING (cont.)  
HEATING CIRCUIT  
PROBLEM  
PROBABLE CAUSE  
REMEDY  
Water does not heat to proper  
temperature  
Brewer has shut down due to  
malfunction (See Diagnostic Chart  
in manual, Page 19, or under top  
lid).  
1. Display flashing (CDBC-APS/TC/  
TS/TSR) or ready light flashing  
(CEZ-APS/TS/TSR)  
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 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  
A) 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  
4a.  
3a. Dry Plug In Probe Sensing Sys-  
tem (CDBC-APS/TC/TS/TSR)  
B) Disconnect the brewer from the  
power source. Disconnect the J5  
connector from the control board.  
Check for continuity from the tank  
mounting screw where the green  
wire mounts, to pin 4 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 2  
of the plug, continuity should be  
present. Connect the J5 plug to the  
control board and proceed to step  
4b.  
3b. Dry Plug In Probe Sensing Sys-  
tem (CEZ-APS/TS/TSR)  
29253 111103  
Page 13  
TROUBLESHOOTING (cont.)  
HEATING CIRCUIT (cont.)  
PROBLEM  
PROBABLE CAUSE  
REMEDY  
Water does not heat to proper 4a.TemperatureProbe(CDBC-APS/ A)Removetheprobefromthegrom-  
temperature (cont.)  
TC/TS/TSR)  
met and submerge in a water bath  
of approximately 70°F(21°C). Con-  
nectanohmmetertopins3and4of  
the J3 connector. At 60°F(16°C)  
the reading should be 15.3k 2k  
OHMS, at 70°F(21°C) the reading  
should be 11.8k 2k OHMS, and at  
80°F(27°C) the reading should be  
9.3k 2k OHMS. If the probe is  
withintheseparameters, reconnect  
the J3 plug to the control board.  
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.  
4b. Temperature Probe (CEZ-APS/  
TS/TSR)  
B)Removetheprobefromthegrom-  
met and submerge in a water bath  
of approximately 70°F(21°C). Con-  
nectanohmmetertopins2and3of  
the J5 connector. At 60°F(16°C)  
the reading should be 15.3k 2k  
OHMS, at 70°F(21°C) the reading  
should be 11.8k 2k OHMS, and at  
80°F(27°C) the reading should be  
9.3k 2k OHMS. If the probe is  
withintheseparameters, reconnect  
the J5 plug to the control board.  
5. Limit Thermostat (CDBC-APS/ Disconnect the brewer from the  
TC/TS/TSR & CEZ-APS/TS/TSR)  
power source. Check for continuity  
across the limit thermostat termi-  
nals. Continuity should be present.  
If not replace the limit thermostat.  
(See page 27)  
6. Tank Heater (CDBC-APS/TC/TS/ Disconnect the brewer from the  
TSR & CEZ-APS/TS/TSR)  
power source. Check for continuity  
between the white terminal of the  
terminalblockandtheblackwireon  
therelayonthecontrolboard.There  
should be a low OHM reading. If no  
continuity is present, check for a  
wiring problem, then replace the  
tank heater if no wiring problem is  
found. (See page 28)  
Spitting or excessive steaming  
1. Lime build up on temperature Inspect probe and tank assembly  
probe, tank or tank heater  
for excessive lime deposits. Delime  
as required.  
29253 111103  
Page 14  
TROUBLESHOOTING (cont.)  
HEATING CIRCUIT (cont.)  
PROBLEM  
PROBABLE CAUSE  
REMEDY  
Spitting or excessive steaming 2a.TemperatureProbe(CDBC-APS/ A)Removetheprobefromthegrom-  
(cont.)  
TC/TS/TSR)  
met and submerge in a water bath  
of approximately 70°F(21°C). Con-  
nectanohmmetertopins3and4of  
the J3 connector. At 60°F(16°C)  
the reading should be 15.3k 2k  
OHMS, at 70°F(21°C) the reading  
should be 11.8k 2k OHMS, and at  
80°F(27°C) the reading should be  
9.3k 2k OHMS. If the probe is  
withintheseparameters, reconnect  
the J3 plug to the control board.  
2b. Temperature Probe (CEZ-APS/ B)Removetheprobefromthegrom-  
TS/TSR)  
met and submerge in a water bath  
of approximately 70°F(21°C). Con-  
nectanohmmetertopins2and3of  
the J5 connector. At 60°F(16°C)  
the reading should be 15.3k 2k  
OHMS, at 70°F(21°C) the reading  
should be 11.8k 2k OHMS, and at  
80°F(27°C) the reading should be  
9.3k 2k OHMS. If the probe is  
withintheseparameters, reconnect  
the J5 plug to the control board.  
3. Control Board (CDBC & CEZ)  
Setthetemperatureto200°F(95°C).  
Let tank temperature stabilize. If  
temperature in tank is above tem-  
perature setting by more than 7°F,  
replace the control board.(See  
pages 21 & 22)  
1. Plumbing lines  
2. Water supply  
3. Lime build up  
Plumbing lines should not rest on  
the counter top.  
Brewer is making unusual noises  
The brewer must be connected to a  
cold water supply.  
Remove the tank lid and clean in-  
sideoftankwithadelimingagent, if  
necessary.  
29253 111103  
Page 15  
TROUBLESHOOTING (cont.)  
BREWING CIRCUIT  
PROBLEM  
PROBABLE CAUSE  
REMEDY  
Brew cycle will not start  
1. Display flashing (CDBC-APS/TC/ Brewer has shut down due to  
TS/TSR) or ready light flashing malfunction (See Diagnostic Chart  
(CEZ-APS/TS/TSR)  
in manual, Page 19, or under top lid  
of brewer).  
2. No water  
Waterlinesandvalvestothebrewer  
must be open.  
3. No power or incorrect voltage to Check for voltage across the black  
the brewer  
and white terminals at the terminal  
block.  
4. ON/OFF switch not in the "ON" The indicator lamp must be lit  
position  
5. Low water temperature (Brew Allow brewer to heat until ready  
lockout is enabled)  
lamp is lit, or disable the brew lock-  
out feature. (See page 7 or 8)  
6. Water not touching refill probe Press ON/OFF switch (indicator  
inside tank  
must be lit). Brewer will refill until  
water touches probe inside tank.  
Water must be in contact with refill  
probe before brew cycle will start.  
7. Switchpanel(CDBC-APS/TC/TS/ Disconnect the brewer from the  
TSR)  
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  
"ON". If no continuity is present,  
replace the switch membrane  
decal.(See page 23)  
29253 111103  
Page 16  
TROUBLESHOOTING (cont.)  
BREWING CIRCUIT (cont.)  
PROBLEM  
PROBABLE CAUSE  
REMEDY  
Brew cycle will not start (cont.)  
8. Control board or dispense valve If the start switch (CEZ-APS/TS/  
(CDBC-APS/TC/TS/TSR & CEZ- TSR) or switch panel (CDBC-APS/  
APS/TS/TSR)  
TC/TS/TSR) is operating properly,  
proceed as follows. Attach a volt-  
meter to the terminals of the dis-  
pense valve 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 valve  
(See page 26). If continuity is  
present, the valve may be stuck  
closed.  
Consistently low beverage level in  
thedispenserorbeverageoverflows  
dispenser  
1.Brewvolume(CDBC-APS/TC/TS/ Set up brewer according to instruc-  
TSR & CEZ-APS/TS/TSR)  
NOTE: All volumes to run with  
sprayhead attached.  
tionsinsection Adjustments-Brew  
Volumes. (See pages 7 or 8) Using  
a stop watch or second hand, time  
thelengthofthebrewcycle.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  
26)  
29253 111103  
Page 17  
TROUBLESHOOTING (cont.)  
BREWING CIRCUIT (cont.)  
PROBLEM  
PROBABLE CAUSE  
REMEDY  
Dripping from sprayhead  
1. Lime build up  
Inspect the tank assembly for ex-  
cessive lime deposits. Delime as  
required.  
2. Dispense valve  
Remove the dispense valve and  
clear any obstructions. Rebuild or  
replace the valve if necessary.(See  
page 26)  
Weak beverage  
1. Sprayhead  
A clean stainless steel spray-head  
must be used for proper extraction.  
2. Water temperature  
Place an empty brew funnel on an  
empty server 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.  
3. Filter type  
BUNN® paper filters must be used  
for proper extraction.  
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.  
29253 111103  
Page 18  
TROUBLESHOOTING (cont.)  
BREWING CIRCUIT (cont.)  
PROBLEM  
PROBABLE CAUSE  
REMEDY  
Dry coffee grounds remain in the  
funnel  
1. Sprayhead  
Makesuresprayheadispresentand  
holes are clear and unobstructed.  
There should be separate streams  
of water coming out of each hole in  
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.  
29253 111103  
Page 19  
DIAGNOSTICS  
Intermittent flashing of the READY indicator (Model CEZ) or the bank of temperature indicators (Model CDBC)  
indicates that a fault exists. Count the number of flashes between pauses and use this chart as a guide to  
investigating the fault.  
FLASHES CAUSE  
THINGS TO CHECK  
1
2
Dry Plug - In Fault -  
Water Pressure  
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  
Low Tank Level Fault -  
Level probe dry for 7 minutes after fill valve is energized  
Water pressure  
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  
29253 091603  
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.  
I
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.
.
.
I
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CTU NG
UFA SPR  
/  
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P
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COV  
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IS  
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B
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EF  
C
LA  
P
E
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 and front access  
panel.  
The top cover is attached with one #4-40 screw.  
The front access panel is attached with four #6-32  
screws.  
I
/
U
NUFACT  
B
MA  
SPRINGFIELD, ILLINO
I
,
.
E
FOLLOW  
O
F
T
H
MODEL  
VOLTS A.C.  
PHASE  
AMP  
W
WATT
NDING  
R
ONE OR MORE  
ED UNDE  
COVER  
E
OR MORE OR
ON  
Contents  
Control Board - CDBC-APS/TC/TS/TSR .............22  
Control Board - CEZ-APS/TS/TSR......................23  
Switch Panel - CDBC-APS/TC/TS/TSR ..............24  
ON/OFF Switch - CEZ-APS/TS/TSR ....................25  
BREW Switch (Start) - CEZ-APS/TS/TSR...........26  
Dispense Valve ..................................................27  
Limit Thermostat ...............................................28  
Tank Heater .......................................................29  
Refill Valve.........................................................31  
Wiring Diagrams............................................... 32  
P1913  
FIG. 1 COMPONENT ACCESS  
29253 111103  
Page 21  
SERVICE (cont.)  
CONTROL BOARD - Model CDBC-APS/TC/TS/TSR  
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.  
I
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.  
.  
.
.
O
I
I
I
I
/
U
T
N  
C
R
A
P
F
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A
B
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.
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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.  
NOTE: The four nylon washers must be installed  
under the heads of the four #6 screws to prevent  
a possible shorting of the control board circuits.  
6. Connect the 11-pin connector from the control  
panel.  
7. Connect the 10-pin connector and the 4-pin con-  
nector from the main wiring harness.  
8. Connectthebluewireandblackwiretotherelayon  
the control board.  
9. Refer to CDBC-APS/TC/TS/TSR Adjustments and  
Optional Settings to program the new control  
board.  
P1914  
FIG. 2 CONTROL BOARD  
Location:  
The Control Board is located inside the top cover  
behind the front end cap.  
Test Procedures:  
The test procedures for the control board will vary  
depending upon the problems experienced by the  
brewer. Refer to the Troubleshooting guide beginning  
on page 9. The troubleshooting guide is divided into  
threesections,RefillCircuit,HeatingCircuit,andBrew-  
ing Circuit.  
29253 111103  
Page 22  
SERVICE (cont.)  
CONTROL BOARD - Model CEZ-APS/TS/TSR  
Removal and Replacement:  
1. Disconnect the black wire and blue wire from the  
relay on the control board.  
2. Disconnect the 8-pin connector and the 6-pin  
connector from the main wiring harness.  
3. Disconnect the 2-pin connector from the ready  
indicator LED.  
J1  
M
J2  
J3  
J5  
4. Remove the four #6-32 screws securing the con-  
trol board to the component mounting bracket.  
5. Remove the four spacers from the control board  
and attach them to the new board.  
J4  
D
S
U
R
F
A
C
E
S
A
R
E
H
O
T
J6  
J7  
:
6. Locate J6 connector on control board. If jumper is  
across pins 1 & 2, board is set to operate tea  
brewer or a brewer that DOES NOT use a water  
level probe. If jumper is across pins 2 & 3, board  
is set to operate a coffee brewer or a brewer that  
uses a water level probe. Look at the bottom side  
of the control board. Pin 1 of connector J6 is  
markedbyasquaresolderpadandpins2,3&4are  
round.  
7. Check the jumper on the brew temperature lock-  
outjackfordesiredfunction(enabledordisabled).  
8. Check the jumper on the temperature jack for  
desired brew temperature. The factory setting  
should be 200°F(95°C)  
P1915  
FIG. 3 CONTROL BOARD  
Location:  
The Control Board is located inside the trunk  
behind the front access panel.  
9. Install a new control board and secure with the  
four #6-32 screws to the component mounting  
bracket.  
10. Connect the 2-pin connector from the ready indi-  
cator LED.  
11. Connect the 8-pin connector and the 6-pin con-  
nector from the main wiring harness.  
12. Connectthebluewireandblackwiretotherelayon  
the 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 9. The troubleshooting guide is divided into  
threesections,RefillCircuit,HeatingCircuit,andBrew-  
ing Circuit.  
13. Refer to CEZ-APS/TS/TSR Adjustments and Op-  
tional Settings to program the new control board.  
29253 091603  
Page 23  
SERVICE (cont.)  
SWITCH PANEL - Model CDBC-APS/TC/TS/TSR  
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.  
.  
MANUFACTURED BY BUN
B
SPRINGFIELD, ILL  
A.C.  
AMP  
W
MODEL  
VOLTS  
PHAS  
E
MAY BE PEN
NTS  
ATE  
ORPEOF THE
COVERED UNDER ONE ORHEM  
R
ONE OR MOR
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.  
P1916  
FIG. 4 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 9. The troubleshooting  
guide is divided into three sections, Refill Circuit,  
Heating Circuit, and Brewing Circuit.  
29253 111103  
Page 24  
SERVICE (cont.)  
ON/OFF SWITCH - Model CEZ-APS/TS/TSR  
6. Check for continuity across the center and lower  
terminal with the switch in the "ON" position.  
Continuity must not be present when the switch is  
in the "OFF" position.  
If continuity is present as described, reconnect the  
black wire to the center terminal and the remaining  
wire to the lower terminal.  
If continuity is not present as described, replace the  
switch.  
/
MANUFACTURED BY BUNN-I
SPRINGFIELD, ILLIN..
B
R
Removal and Replacement:  
FACES ARE HOT  
MODEL  
VOLTS A.C.  
PHASE  
AMP  
WIRE  
WATT
HERTZ  
ONE OR MOREOF THE FOLLOWING PAT
COVERED UNDE  
1. Remove the wires from the switch terminals.  
2. Removethehoseconnectedtothefaucet.Remove  
thenutsecuringthefaucetassemblytothebrewer  
and remove the faucet.  
ORE OTHER
ONE OR  
M
N  
:
WARNING  
!
3. Remove the four nuts securing the end cap to the  
brewer and remove the end cap.  
DISCONNECT FROM POWER SOURCE  
BEFORE REMOVAL OF ANY PANEL OR  
REPLACEMENT OF ANY COMPONENT!  
4. Remove the switch and replace with new switch.  
5. Install the front end cap and faucet assembly.  
6. Refer to FIG. 6 when reconnecting the wires.  
P1917  
FIG. 5 ON/OFF SWITCH  
Location:  
The ON/OFF switch is located on the front of the  
hood.  
WHI to Terminal  
Block (White Insert)  
Test Procedure:  
1. Disconnect the brewer from the power source.  
2. Viewingtheswitchfromthebackremovethewhite  
wire from the upper terminal and the black wire  
from the center terminal.  
BLK to Terminal  
Block (Black Insert)  
3. With a voltmeter, check the voltage across the  
white wire and the black wire. Connect the brewer  
to the power source. The indication must be 120  
volts ac for two wire 120 volt models and three  
wire 120/240 volt models.  
WHI/RED to Control  
Board (J1-8)  
P1918  
4. Disconnect the brewer from the power source.  
FIG. 6 ON/OFF SWITCH WIRING  
If voltage is present as described, reconnect the white  
wire and proceed to #5.  
If voltage is not present as described, refer to the  
Wiring Diagrams and check the brewer wiring har-  
ness.  
5. With the black wire removed, remove the wire  
from the lower terminal.  
29253 091603  
Page 25  
SERVICE (cont.)  
BREW SWITCH (Start) - Model CEZ-APS/TS/TSR  
If continuity is present as described, reconnect the  
white/yellow wire to the top terminal and the white/  
orange to the bottom terminal.  
If continuity is not present as described, replace the  
switch.  
Removal and Replacement:  
1. Remove the white/yellow wire and white/orange  
from the BREW switch.  
2. Compress the clips inside the hood and gently  
push the switch through the opening.  
MANUFACTURED BY BUNNI
B
SPRINGFIELD, ILLINO.  
MODEL  
VOLTS A.C.  
PHASE  
AMP  
WIRE  
WAT
HERT
SURFACES ARE HOT  
COVERED UNDER ONE OR MOREOF THE
ONE OR MORE
N  
:
3. Push new switch into the opening and spread the  
clips to hold the BREW switch in the hood.  
4. Refer to FIG. 8 when reconnecting the wires.  
WARNING  
!
DISCONNECT FROM POWER SOURCE  
BEFORE REMOVAL OF ANY PANEL OR  
REPLACEMENT OF ANY COMPONENT!  
P1917  
FIG. 7 BREW SWITCH  
WHI/YEL from  
Control Board J5-1  
Location:  
The BREW switch is located in the center front of  
the hood.  
WHI/ORA from  
Control Board J5-6  
Test Procedure:  
1. Disconnect the brewer from the power source.  
2. Disconnect the white/yellow wire from the top  
switch terminal and the white/orange from the  
bottom switch terminal.  
P1851  
FIG. 8 BREW SWITCH WIRING  
3. Check for continuity across the two terminals on  
the switch when it is held in the lower position.  
Continuity must not be present across these ter-  
minals when the switch is released.  
29253 091603  
Page 26  
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 for two-wire 120  
volt models and three-wire 120/208 volt models.  
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.  
I
.  
F
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A
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DEL  
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PAT  
D
U
ERE  
V
ER  
CO  
TH  
O
RE  
O
M
R
E
O
ON  
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.  
P1919  
FIG. 9 DISPENSE VALVE  
3. Remove water lines from the dispense valve.  
4. Remove the two #8-32 nuts securing the dispense  
valve to the sprayhead panel.  
5. Install a new dispense valve using the two #8-32  
nuts.  
6. Reconnect water lines to the dispense valve and  
secure in place with clamps.  
7. Refer to FIG. 10 when reconnecting wires.  
Location:  
The dispense valve is located inside the top cover  
behind the front end cap.  
Test Procedures:  
1. Disconnect the brewer from the power source.  
2. Check the water level in the tank to confirm that it  
is within 1/2" from the top of the tank.  
3. Connect the brewer to the power source. If the  
brewer has been set for brewer temperature lock-  
out, this feature must be disabled. See Page 8 for  
procedure.  
WHI/GRN from  
Control Board  
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.  
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. 10 DISPENSE VALVE WIRING  
If the sound is not heard as described, proceed to #6.  
29253 091603  
Page 27  
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. 12 when reconnecting the wires.  
I  
U
T
C
R
A
P
F
S
U
N
A
M
B
L
L
O
.
F
.C  
E
H
T
L
A
E
S
E
R
F
O
D
T
S
O
O
L
A
E
R
M
O
N
V
P
O
O
I
M
N
D
H
N
E
P
E
E
B
Y
A
R
E
M
D
S
T
N
U
N
TE  
D
E
R
PA  
E
V
R
E
O
C
H
T
O
E
R
O
M
R
O
E
N
O
BLU from Control  
Board  
P1920  
BLK from Terminal  
Block  
FIG. 11 LIMIT THERMOSTAT  
P1800  
Location:  
FIG. 12 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.  
29253 091603  
Page 28  
SERVICE (cont.)  
TANK HEATER  
If continuity is present as described, reconnect the  
wires, the tank heater is operating properly.  
If continuity is not present as described, replace the  
tank heater.  
NOTE- If the tank heater remains unable to heat,  
remove and inspect heater for cracks in the sheath.  
Removal and Replacement:  
1. Remove the top cover or top warmer housing and  
front access panel as previously described.  
2. Disconnect the vent hose from the top of the tank  
by pulling the elbow fitting from the grommet in  
the top of the tank lid.  
3. Drain water from the tank.  
4. Disconnect the water supply tube to the dispense  
valve from the side of the tank.  
5. Disconnect the water supply tube to the solenoid  
valve from the bottom of the tank.  
6. On brewers with faucet, disconnect the outlet  
water line to the faucet from the side of the tank.  
7. Disconnect the temperature probe from the top of  
the tank by pulling the probe from the grommet in  
the top of the tank lid.  
8. Disconnect the pink wire from the level probe.  
9. Disconnectthegreenwirefromthetopofthetank.  
10. Disconnect the limit thermostat from the side of  
the tank.  
11. Disconnect the two white wires from the tank  
warmer blanket.  
P1855  
FIG. 13 TANK HEATER  
Location:  
The tank heater is located inside the tank and  
secured to the tank bottom.  
Test Procedures:  
1. Disconnect the brewer from the power supply.  
2. With a voltmeter, check the voltage across the  
white or red wire from the terminal block and the  
black wire from the control board. Connect the  
brewer to the power source. The indication must  
be120voltsacfortwowire120voltmodelsor240  
volts ac for three wire 120/240 volt models.  
3. Disconnect the brewer from the power source.  
12. Disconnecttheblackwireandthewhiteorredwire  
from the tank heater terminals.  
13. Remove the four #8-32 nuts securing the tank to  
the mounting brackets and remove the tank as-  
sembly.  
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.  
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.  
4. Disconnecttheblackwireandthewhitewireorred  
wire from the tank heater terminals.  
5. Check for continuity across the tank heater termi-  
nals.  
16. Install new tank heater with gaskets to the bottom  
of the tank and secure with two hex nuts.  
29253 091603  
Page 29  
SERVICE (cont.)  
TANK HEATER (Cont.)  
17. Install tank assembly onto mounting brackets and  
secure in place with four #8-32 nuts.  
18. Install tank lid and secure in place with eight #8-32  
nuts.  
19. Connect the two white wires of the tank warmer  
blanket.  
20. Connectthelimitthermostattothefrontofthetank  
assembly.  
21. Connect the green wire to the tank mounting  
bracket using #8-32 nut.  
BLK to Control Board  
22. Connect the pink wire to the level probe.  
23. Insert the temperature probe through the grom-  
met in the tank lid.  
WHI or RED to Terminal  
Block  
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.  
P1856  
FIG. 14 TANK HEATER WIRING  
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. RefertoFIG. 14whenreconnectingthetankheater  
wires.  
29. Install access panels and covers and refer to Initial  
Set-up for refill and operation.  
29253 091603  
Page 30  
SERVICE (cont.)  
REFILL VALVE  
If continuity is not present as described, replace the  
refill valve.  
J1  
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.  
J2  
J3  
J5  
J4  
SURFACES ARE HOT  
J6  
J7  
:
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.  
Ifthe soundis notheardas described, replacetherefill  
valve.  
P1915  
FIG. 15 REFILL VALVE  
Removal and Replacement:  
1. Remove both wires from the refill valve.  
2. Turn off the water supply to the brewer.  
3. Disconnect the water lines to and from the refill  
valve.  
Location:  
The refill valve is located inside the trunk on the  
lower center part of the component bracket.  
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.  
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 120/240 volt  
models.  
7. Refer to FIG. 16 when reconnecting the wires.  
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  
P1858  
If continuity is present as described, reconnect the  
white and white/blue wires from the circuit board.  
FIG. 16 REFILL VALVE WIRING  
29253 091603  
Page 31  
SCHEMATIC WIRING DIAGRAM CDBC-APS/TS/TSR  
EARLY MODELS  
L1  
N
L2  
GRN  
LIMIT  
THERMOSTAT  
WHI-14 (MODELS 15 & 20)  
RED-14 (MODEL 35)  
TANK HEATER  
BLU-14  
BLK-14  
BLK-14  
"KEEP WARM" HEATER  
BLK  
WHI  
WHI  
WHI  
BLK  
COUNTER  
(OPTIONAL)  
GRN  
REFILL  
BLK  
BLK  
BLU-14  
BLK-14  
WHI  
J1-1  
J1-2  
COM  
N.O.  
WHI/BLU  
SOL  
C
O
N
T
R
O
L
DISPENSE  
WHI  
WHI  
WHI/GRN  
SOL  
WHI  
BLK  
J1-1  
P
C
WHI/BLU  
J1-5  
B
O
A
R
D
WHI/GRN  
J1-10  
J2-1  
CONTROL PANEL ASSY  
BREW SW  
ON/OFF SW  
HIDDEN SW  
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  
BLK  
LEVEL  
PROBE  
J3-4  
t°  
29253 111103  
Page 32  
SCHEMATIC WIRING DIAGRAM CEZ-APS/TS/TSR  
GRN  
AUXILIARY  
OUTLET  
L1  
N
L2  
BLK  
WHI  
GRN  
LIMIT  
THERMOSTAT  
WHI-14 (MODELS 15 & 20)  
TANK HEATER  
BLK-14  
BLK-14  
"KEEP WARM" HEATER  
BLU-14  
RED-14 (MODEL 35)  
WHI  
WHI  
BLK  
ON/OFF SWITCH  
WHI  
REFILL  
COUNTER (OPTIONAL)  
BLK  
BLK  
WHI/BLU  
WHI  
WHI/RED  
BLK  
BLK  
BLU-14  
BLK-14  
SOL  
TRM-1  
TRM-2  
COM  
DISPENSE  
SOL  
WHI/GRN  
WHI  
WHI  
N.O.  
WHI  
J1-1  
C
WHI/BLU  
WHI/GRN  
O
N
T
R
O
L
BLK  
WHI/RED  
WHI/YEL  
BLK  
WHI  
BREW SWITCH  
WHI/ORA  
J1-8  
J5-1  
B
O
A
R
D
GRN  
PNK  
120V AC 2 WIRE  
WHI/ORA  
J5-6  
120/208V AC 3 WIRE  
120/240V AC 3 WIRE  
SINGLE PHASE  
LEVEL  
PROBE  
GRY  
PNK  
J7-1  
J7-2  
t°  
29253 091603  
Page 33  
SCHEMATIC WIRING DIAGRAM  
CDBC 15, 20 & 35 APS/TC/TS  
LATE MODELS  
L1  
N
L2  
GRN  
LIMIT  
THERMOSTAT  
WHI-14 (MODELS 15 & 20)  
RED-14 (MODEL 35)  
TANK HEATER  
BLU-14  
BLK-14  
BLK-14  
"KEEP WARM" HEATER  
WHI  
WHI  
WHI  
BLK  
COUNTER  
(OPTIONAL)  
REFILL  
BLK  
BLK  
J1-1  
J1-2  
COM  
N.O.  
WHI/BLU  
SOL  
C
O
N
T
R
O
L
DISPENSE  
BLU-14  
BLK-14  
WHI  
WHI  
WHI/GRN  
SOL  
WHI  
BLK  
J1-1  
P
C
WHI/BLU  
J1-5  
B
O
A
R
D
WHI/GRN  
J1-10  
J2-1  
CONTROL PANEL ASSY  
BREW SW  
ON/OFF SW  
HIDDEN SW  
J2-6  
120V AC 2 WIRE  
120/208V AC 3 WIRE  
120/240V AC 3 WIRE  
SINGLE PHASE  
STATIC  
SHIELD  
J2-11  
J3-1  
PNK  
GRN  
WHI  
BLK  
LEVEL  
PROBE  
J3-4  
J5-1  
BLK  
t°  
29253 021604  
Page 34  

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