BUNN
®
CEZ-APS, CDBC-APS,
CEZ-TS, CDBC-TS,
CEZ-TSR, CDBC-TSR
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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
www.bunnomatic.com
INTRODUCTION
This equipment will automatically brew a half-gallon batch of coffee into an awaiting server at the press of a
button. A hot water faucet may be included for allied beverage use. Most functions of the brewer are digitally
controlled. It is only for indoor use on a sturdy counter or shelf.
CONTENTS
Introduction & Warranty .................................................................................... 2
User Notices ...................................................................................................... 3
Electrical & Plumbing Requirements ................................................................. 4
Operating Controls............................................................................................. 5
Initial Set-Up, Coffee Brewing, & Cleaning......................................................... 6
CEZ-APS/TS/TSR Adjustments & Optional Settings .......................................... 7
CDBC-APS/TS/TSR Adjustments & Optional Settings ....................................... 8
Troubleshooting................................................................................................. 9
Service............................................................................................................. 20
Wiring Diagrams.............................................................................................. 31
WARRANTY
Bunn-O-Matic Corp. (“Bunn”) warrants the equipment manufactured by it to be commercially free from defects
in material and workmanship existing at the time of manufacture and appearing within one year from the date of
installation. In addition:
1.) Bunn warrants electronic circuit and/or control boards to be commercially free from defects in material and
workmanship for two years from the date of installation.
2.) Bunn warrants the compressor on refrigeration equipment to be commercially free from defects in material
and workmanship for two years from the date of installation.
3.) Bunn warrants that the grinding burrs on coffee grinding equipment will grind coffee to meet original factory
screen sieve analysis for three years from date of installation or for 30,000 pounds of coffee, whichever comes first.
This warranty does not apply to any equipment, component or part that was not manufactured by Bunn or that,
in Bunn’s judgement, has been affected by misuse, neglect, alteration, improper installation or operation, improper
maintenance or repair, damage or casualty.
THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARRANTY, WRITTEN OR
ORAL, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF EITHER
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. The agents, dealers or employees of Bunn are
not authorized to make modifications to this warranty or to make additional warranties that are binding on Bunn.
Accordingly, statements by such individuals, whether oral or written, do not constitute warranties and should not
be relied upon.
The Buyer shall give Bunn prompt notice of any claim to be made under this warranty by telephone at (217)
529-6601 or by writing to Post Office Box 3227, Springfield, Illinois, 62708-3227. If requested by Bunn, the Buyer
shall ship the defective equipment prepaid to an authorized Bunn service location. If Bunn determines, in its sole
discretion, that the equipment does not conform to the warranty, Bunn shall repair the equipment with no charge
for parts during the warranty period and no charge for labor by a Bunn Authorized Service Representative during
the warranty period. If Bunn determines that repair is not feasible, Bunn shall, at its sole option, replace the
equipment or refund the purchase price for the equipment.
THE BUYER’S REMEDY AGAINST BUNN FOR THE BREACH OF ANY OBLIGATION ARISING OUT OF THE SALE
OF THIS EQUIPMENT, WHETHER DERIVED FROM WARRANTY OR OTHERWISE, SHALL BE LIMITED, AS
SPECIFIED HEREIN, TO REPAIR OR, AT BUNN’S SOLE OPTION, REPLACEMENT OR REFUND.
In no event shall Bunn be liable for any other damage or loss, including, but not limited to, lost profits, lost sales,
loss of use of equipment, claims of Buyer’s customers, cost of capital, cost of down time, cost of substitute
equipment, facilities or services, or any other special, incidental or consequential damages.
Page 2
29253 030101
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.
Page 3
ELECTRICAL REQUIREMENTS
CAUTION - The brewer must be disconnected from the power source until specified in
Model 15 has an attached cordset and requires 2-wire grounded service rated 120 volts ac, 15 amp, single
phase, 60 Hz.
Initial Set-Up.
WHITE
NEUTRAL
L1 BLACK
120V.A.C.
Model 20 requires 2-wire, grounded service rated
120 volts ac, 20 amp, single phase, 60 Hz. Proceed as
follows:
Model 35 requires 3-wire, grounded service rated
120/208 or 120/240 volts ac, 20 amp, single phase, 60
Hz. Proceed as follows:
L2 RED
WHITE
NEUTRAL
L1 BLACK
120V.A.C.
208 or 240V.A.C.
120V.A.C.
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 20 and 90 psi (138
and 620 kPa) from a 1⁄2" or larger supply line. A shut-off valve should be installed in the line before the brewer. Install
a regulator in the line when pressure is greater than 90 psi (620 kPa) to reduce it to 50 psi (345 kPa). The water
inlet fitting is 1⁄4" flare. Bunn-O-Matic does not recommend the use of a reverse-osmosis or deionized water supply
to this equipment.
NOTE - Bunn-O-Matic recommends 1⁄4" copper tubing for installations of less than 25 feet and 3⁄8" for more than
25 feet from the 1⁄2" water supply line. A tight coil of copper tubing in the water line will facilitate moving the brewer
to clean the 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.
Page 4
29253 011900
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. Stopping 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
P1910
when the 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" switch is in the "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/TS/TSR
ON/OFF SWITCH
Pressing the "ON/OFF" switch (indicator glowing) enables the brew
circuit and energizes the tank refill circuit. Pressing the switch again
(indicator not glowing) stops tank refilling and brewing. Stopping 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 "ON/OFF" indicator is not glowing because the tank will not
P1911
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.
READY INDICATOR
This indicator glows when the preset temperature has been achieved. The word "NOT" above "READY" will glow
in all other instances.
TEMPERATURE INDICATORS (Feature disabled from the factory – refer to page 8.)
The indicator glows to communicate the brew water temperature. Two indicators will glow when the
temperature is between them.
Page 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/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/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/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.
6. When brewing is completed, simply discard the grounds and filter.
CLEANING
1. The use of a damp cloth rinsed in any mild, non-abrasive, liquid detergent is recommended for cleaning all
surfaces on Bunn-O-Matic equipment.
2. Check and clean the sprayhead. The sprayhead holes must always remain open.
Page 6
29253 071599
CEZ-APS/TS/TSR ADJUSTMENTS & OPTIONAL SETTINGS
Page 7
CDBC-APS/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
will glow. Release both switches. Pressing and releasing the "ON/OFF" switch will toggle between turning the entire
bank of temperature indicators on-or-off, signifying the "ON" or "OFF" condition of this display. Wait for a few
seconds, the brewer will maintain this last setting.
Setting Brew Lockout
The brewer is factory set with the brew lockout disabled. Brew lockout prevents starting a brew cycle if the ready
indicator is not glowing. When an attempt at brewing cannot be allowed, the word "NOT" and "LOCKOUT" flash for
three seconds to indicate the reason the brew can't begin. To change the condition of the brew lockout, press and
hold the "HIDDEN" switch beneath the "®" and momentarily press the "BREW" switch.
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 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
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 5 seconds), then release the "BREW" switch.
Momentarily press and release the "BREW" switch once for each ounce (approximate) of water to be added to the
prior setting and allow the brew cycle to finish.
To decrease the amount of water for each brew cycle place an empty funnel in the funnel rails and an empty
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 5 seconds), then
release the "BREW" switch and allow the cycle to finish.
Page 8
29253 030101
TROUBLESHOOTING
A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems
encountered. If the problem remains after exhausting the troubleshooting steps, contact the Bunn-O-Matic
Technical Service Department.
• Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel.
• All electronic components have 120 volt ac and low voltage dc potential on their terminals. Shorting of
terminals or the application of external voltages may result in board failure.
• Intermittent operation of electronic circuit boards is unlikely. Board failure will normally be permanent. If an
intermittent condition is encountered, the cause will likely be a switch contact or a loose connection at a
terminal or crimp.
• Solenoid removal requires interrupting the water supply to the valve. Damage may result if solenoids are
energized for more than ten minutes without a supply of water.
• The use of two wrenches is recommended whenever plumbing fittings are tightened or loosened. This will help
to avoid twists and kinks in the tubing.
• Make certain that all plumbing connections are sealed and electrical connections tight and isolated.
• This brewer is heated at all times. Keep away from combustibles.
WARNING – • Exercise extreme caution when servicing electrical equipment.
• Unplug the brewer when servicing, except when electrical tests are specified.
• Follow recommended service procedures.
• Replace all protective shields or safety notices.
Before troubleshooting this brewer, check for the following:
A. Control Boards (CDBC-APS/TS/TSR)
1. Make sure ribbon cable is properly attached to the control board (ALL PINS INSERTED INTO PLUG).
2. Make sure there is a nylon insulating washer under each screw head that holds the control board to the plastic
front end cap. This is important for proper operation.
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/TS/TSR & CEZ-APS/TS/TSR)
Make sure before servicing brewer that voltage is present at control board.
On CDBC-APS/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.
Page 9
29253 071599
TROUBLESHOOTING (cont.)
REFILL CIRCUIT
PROBABLE CAUSE REMEDYPROBLEM
Will not fill or refill
1. Power off to brewer (CDBCAPS/TS/TSR & CEZ-APS/TS/TSR)
2. Water shut off (CDBC-APS/TS/
TSR & CEZ-APS/TS/TSR)
3. Display flashing (CDBC-APS/
TS/TSR) or ready light flashing
(CEZ-APS/TS/TSR)
4. ON/OFF Switch (CDBC-APS/TS/
TSR & CEZ-APS/TS/TSR)
5. Lime build up on Probe (CDBCAPS/TS/TSR & CEZ-APS/TS/TSR)
6. Refill Valve or Control Board
(CDBC-APS/TS/TSR & CEZ-APS/
TS/TSR)
Press ON/OFF switch on control
panel to determine if power is ON.
Make sure water is ON.
Brewer has shut down due to
malfunction (See Diagnostic Chart
in manual, Page 19, or under top
lid of brewer).
Make sure ON/OFF Switch is "ON"
and indicator is lit.
Remove the Probe and check for
lime deposit on tip. Clean and
reinstall.
Disconnect the brewer from the
power source and remove wires
from refill valve coil. Check for
continuity across the terminals of
the solenoid coil. If continuity is
not present, replace the refill valve
(See page 30). If continuity is
present, the valve may be stuck
closed. Shut water off to brewer.
Set the ON/OFF switch to the "OFF"
position. Open the faucet and drain
water down in the tank until flow
stops or slows to a trickle. Attach
a voltmeter to the terminals of the
refill solenoid. Connect the brewer
to the power source. Press the
switch "ON". Within five seconds,
voltage should be present at the
solenoid terminals. If voltage is
not present, refer to the wiring
diagrams and check the wiring
harness.
Page 10
29253 071599
TROUBLESHOOTING (cont.)
REFILL CIRCUIT (cont.)
Fill or refill does not shut "OFF"
(ON/OFF Switch "ON")
PROBABLE CAUSE
1. Lime build up on probe (CDBCAPS/TS/TSR & CEZ-APS/TS/TSR)
2a. Water Level Probe Sensing
System (CDBC-APS/TS/TSR)
2b. Water Level Probe Sensing
System (CEZ-APS/TS/TSR)
REMEDYPROBLEM
Remove Probe and check for lime
deposits on tip. Clean and reinstall.
A) Disconnect the brewer from the
power source. Disconnect the J3
connector from the control board.
Check for continuity from the nut
on top of the level probe to pin 1 of
the plug, continuity should be
present. Pull the temperature
probe up about an inch from the
grommet. Check for continuity
from the outside surface of the
temperature probe and pin 4 of the
plug, continuity should be present.
Connect the J3 plug to the control
board and proceed to step 3.
B) Disconnect the brewer from the
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. 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 3.
Fill or refill does not shut "OFF"
(ON/OFF Switch "OFF")
3. Refill valve or control board
(CDBC-APS/TS/TSR & CEZ-APS/
TS/TSR)
1. Refill valve or control board
(CDBC-APS/TS/TSR & CEZ-APS/
TS/TSR)
Page 11
Press ON/OFF switch to "ON" (Indicator lamp should be lit). If water continuously flows out of air
vent tube, disconnect the brewer
from the power source. If water
flow stops, replace the control
board. If water flow does not stop,
repair or replace the refill solenoid. (See page 30)
If water continuously flows out of
air vent tube, disconnect the
brewer from the power source. If
water flow does not stop, repair or
replace the refill solenoid. If the
valve closes when power is removed, replace the control board.
(See pages 21 & 22)
29253 071599
TROUBLESHOOTING (cont.)
HEATING CIRCUIT
PROBLEM PROBABLE CAUSE
Water does not heat to proper
temperature
1. Display flashing (CDBC-APS/
TS/TSR) or ready light flashing
(CEZ-APS/TS/TSR)
IMPORTANT: Make sure no temperature tests are taken before the
ready light is "ON". Tank temperature must be stabilized before read-
2. Water not touching tempera-
ture probe
ings are taken.
3a. Dry Plug In Probe Sensing
System (CDBC-APS/TS/TSR)
REMEDY
Brewer has shut down due to
malfunction (See Diagnostic Chart
in manual, Page 19, or under top
lid).
Remove probe and grommet. Look
into hole on tank lid. Water must
be within one inch from top of
tank.
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.
3b. Dry Plug In Probe Sensing
System (CEZ-APS/TS/TSR)
Page 12
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.
29253 071599
TROUBLESHOOTING (cont.)
HEATING CIRCUIT (cont.)
PROBLEM PROBABLE CAUSE REMEDY
Water does not heat to proper
temperature (cont.)
IMPORTANT: Make sure no temperature tests are taken before the
ready light is "ON". Tank temperature must be stabilized before readings are taken.
4a. Temperature Probe (CDBCAPS/TS/TSR)
4b. Temperature Probe (CEZ-APS/
TS/TSR)
A) Remove the probe from the
grommet and submerge in a water
bath of approximately 70°F(21°C).
Connect an ohmmeter to pins 3
and 4 of the J3 connector. At
60°F(16°C) the reading should be
15.3k ± 2k OHMS, at 70°F(21°C)
the reading should be 11.8k ± 2k
OHMS, and at 80°F(27°C) the reading should be 9.3k ± 2k OHMS. If
the probe is within these parameters, reconnect the J3 plug to the
control board.
B) Remove the probe from the
grommet and submerge in a water
bath of approximately 70°F(21°C).
Connect an ohmmeter to pins 2
and 3 of 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 within these parameters, reconnect the J5 plug to the
control board.
Spitting or excessive steaming
5. Limit Thermostat (CDBC-APS/
TS/TSR & CEZ-APS/TS/TSR)
6. Tank Heater (CDBC-APS/TS/
TSR & CEZ-APS/TS/TSR)
1. Lime build up on temperature
probe, tank or tank heater
Page 13
Disconnect the brewer from the
power source. Check for continuity across the limit thermostat terminals. Continuity should be
present. If not replace the limit
thermostat.(See page 27)
Disconnect the brewer from the
power source. Check for continuity between the white terminal of
the terminal block and the black
wire on the relay on the control
board. 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)
Inspect probe and tank assembly
for excessive lime deposits. Delime
as required.
29253 030101
TROUBLESHOOTING (cont.)
HEATING CIRCUIT (cont.)
PROBLEM PROBABLE CAUSE REMEDY
Spitting or excessive steaming
(cont.)
2a. Temperature Probe (CDBC-
APS/TS/TSR)
2b. Temperature Probe (CEZ-APS/
TS/TSR)
A) Remove the probe from the
grommet and submerge in a water
bath of approximately 70°F(21°C).
Connect an ohmmeter to pins 3
and 4 of the J3 connector. At
60°F(16°C) the reading should be
15.3k ± 2k OHMS, at 70°F(21°C)
the reading should be 11.8k ± 2k
OHMS, and at 80°F(27°C) the reading should be 9.3k ± 2k OHMS. If
the probe is within these parameters, reconnect the J3 plug to the
control board.
B) Remove the probe from the
grommet and submerge in a water
bath of approximately 70°F(21°C).
Connect an ohmmeter to pins 2
and 3 of 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 within these parameters, reconnect the J5 plug to the
control board.
Brewer is making unusual noises
3. Control Board (CDBC & CEZ)
1. Plumbing lines
2. Water supply
3. Lime build up
Page 14
Set the temperature to 200°F
(95°C). Let tank temperature stabilize. If temperature in tank is
above temperature setting by more
than 7°F, replace the control
board.(See pages 21 & 22)
Plumbing lines should not rest on
the counter top.
The brewer must be connected to
a cold water supply.
Remove the tank lid and clean
inside of tank with a deliming agent,
if necessary.
29253 030101
TROUBLESHOOTING (cont.)
BREWING CIRCUIT
PROBLEM PROBABLE CAUSE REMEDY
Brew cycle will not start 1. Display flashing (CDBC-APS/
TS/TSR) or ready light flashing
(CEZ-APS/TS/TSR)
2. No water
3. No power or incorrect voltage to
the brewer
4. ON/OFF switch not in the "ON"
position
5. Low water temperature (Brew
lockout is enabled)
6. Water not touching refill probe
inside tank
Brewer has shut down due to
malfunction (See Diagnostic Chart
in manual, Page 19, or under top
lid of brewer).
Water lines and valves to the
brewer must be open.
Check for voltage across the black
and white terminals at the terminal block.
The indicator lamp must be lit
Allow brewer to heat until ready
lamp is lit, or disable the brew
lockout feature. (See page 7 or 8)
Press ON/OFF switch (indicator
must be lit). Brewer will refill until
water touches probe inside tank.
Water must be in contact with
refill probe before brew cycle will
start.
7. Switch panel (CDBC-APS/TS/
TSR)
Page 15
Disconnect the brewer from the
power source. Disconnect the ribbon connector from the control
board. Check for continuity between pins 1 & 2 (An arrow on the
connector indicates pin 1). No
continuity should be present. Press
the BREW switch. Continuity
should be present for as long as
the switch is held "ON". If no continuity is present, replace the
switch membrane decal.(See page
23)
29253 071599
TROUBLESHOOTING (cont.)
BREWING CIRCUIT (cont.)
PROBLEM PROBABLE CAUSE REMEDY
Brew cycle will not start (cont.)
8. Control board or dispense valve
(CDBC-APS/TS/TSR & CEZ-APS/
TS/TSR)
If the start switch (CEZ-APS/TS/
TSR) or switch panel (CDBC-APS/
TS/TSR) is operating properly,
proceed as follows. Attach a voltmeter to the terminals of the dispense 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 harness. If voltage is
present, check for 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
the dispenser or beverage overflows dispenser
1. Brew volume (CDBC-APS/TS/
TSR & CEZ-APS/TS/TSR)
NOTE: All volumes to run with
sprayhead attached.
2. Lime build up
3. Dispense Valve
Set up brewer according to instructions in section
Adjustments
Brew Volumes. (See pages 7 or 8)
Using a stop watch or second hand,
time the length of the brew cycle.
Record this time inside the top lid.
If service is ever needed again, use
the time as reference to determine
if time has changed.
Inspect the dispense valve and
sprayhead for excessive lime deposits. Delime as required.
Remove dispense valve and clear
any obstructions. Rebuild or replace valve if necessary. (See page
26)
-
Page 16
29253 071599
TROUBLESHOOTING (cont.)
BREWING CIRCUIT (cont.)
PROBLEM PROBABLE CAUSE REMEDY
Dripping from sprayhead
Weak beverage
1. Lime build up
2. Dispense valve
1. Sprayhead
2. Water temperature
Inspect the tank assembly for excessive lime deposits. Delime as
required.
Remove the dispense valve and
clear any obstructions. Rebuild or
replace the valve if necessary.(See
page 26)
A six-hole stainless steel sprayhead must be used for proper
extraction.
Place an empty brew funnel on an
empty server beneath the sprayhead. Initiate brew cycle and check
the water temperature immediately below the sprayhead with a
thermometer. The reading must
not be less than 195°F(91°C). Adjust the temperature setting to increase the water temperature.
Refer to
Initial Set-up
instructions.
3. Filter type
4. Coffee grind
5. Funnel loading
BUNN® paper filters must be used
for proper extraction.
A fine drip or grind must be used
for proper extraction.
The BUNN® paper filter must be
centered in the funnel and the bed
of grounds leveled by shaking
gently.
Page 17
29253 030101
TROUBLESHOOTING (cont.)
BREWING CIRCUIT (cont.)
PROBLEM PROBABLE CAUSE REMEDY
Dry coffee grounds remain in the
funnel
1. Sprayhead
2. Funnel loading
Make sure sprayhead is present
and holes are clear and unobstructed. There should be six separate streams of water coming out
of the sprayhead.
The BUNN® paper filter must be
centered in the funnel and the bed
of grounds leveled by shaking gently.
Page 18
29253 071599
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 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
2 Low Tank Level Fault - Water pressure
Level probe dry for 7 minutes after fill valve is energized Level probe wiring
Temperature probe wiring
Fill valve wiring, function, & strainer
3 Low Water Temperature Fault - Tank heater wiring & function
Sensor in tank is calling for heat for 30 minutes or more Temperature probe wiring
4 Tank Sensor Disagreement - Temperature probe wiring
Level probe detects water, but dry plug-in probe dry Level probe wiring
Green wire between tank and circuit board
5 Temp Sensor Out-of-Range - High Sensor not connected to circuit board
6 Temp Sensor Out-of-Range - Low Sensor wires shorted together or to chassis
Page 19
29253 071599
SERVICE
This section provides procedures for testing and
replacing various major components used in this
brewer should service become necessary. Refer to
Troubleshooting
cause of any problem.
WARNING - Inspection, testing, and repair of electrical equipment should be performed only by qualified
service personnel. The brewer should be unplugged
when servicing, except when electrical tests are required and the test procedure specifically states to
plug-in the brewer.
COMPONENT ACCESS
WARNING - Disconnect the brewer from the power
source before the removal of any panel or the replacement of any component.
All components are accessible by the removal of
the top cover or warmer housing and front access
panel.
for assistance in determining the
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The top cover is attached with one #4-40 screw.
The front access panel is attached with four #6-32
screws.
Contents
Control Board - CDBC-APS/TS/TSR ...................21
Control Board - CEZ-APS/TS/TSR...................... 22
Switch Panel - CDBC-APS/TS/TSR ................... 23
ON/OFF Switch - CEZ-APS/TS/TSR .................... 24
BREW Switch (Start) - CEZ-APS/TS/TSR........... 25
Dispense Valve .................................................. 26
Limit Thermostat ............................................... 27
Tank Heater .......................................................28
Refill Valve .........................................................30
Wiring Diagrams............................................... 31
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FIG. 1 COMPONENT ACCESS
P1913
Page 20
29253 030101
SERVICE (cont.)
CONTROL BOARD - Model CDBC-APS/TS/TSR
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FIG. 2 CONTROL BOARD
Location:
The Control Board is located inside the top cover
behind the front end cap.
P1914
Removal and Replacement:
1. Disconnect the black wire and blue wire from the
relay on the control board.
2. Disconnect the 10-pin connector and the 4-pin
connector from the main wiring harness.
3. Disconnect the 11-pin connector from the control
panel.
4. Remove the four #6 screws and four nylon washers and the two #4-40 screws securing the control
board to the end cap assembly.
5. Install a new control board and secure with the
four #6 screws and nylon washers and the two #440 screws to the end cap assembly.
NOTE: The four nylon washers must be installed
under the heads of the four #6 screws to prevent
a possible shorting of the control board circuits.
6. Connect the 11-pin connector from the control
panel.
7. Connect the 10-pin connector and the 4-pin connector from the main wiring harness.
8. Connect the blue wire and black wire to the relay on
the control board.
9. Refer to
Optional Settings
CDBC-APS/TS/TSR Adjustments and
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 9. The troubleshooting guide is divided into
three sections, Refill Circuit, Heating Circuit, and Brewing Circuit.
Page 21
29253 011900
SERVICE (cont.)
CONTROL BOARD - Model CEZ-APS/TS/TSR
J1
TRM1
TRM2
J2
J3
J5
J4
J6
J7
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P1915
FIG. 3 CONTROL BOARD
Location:
The Control Board is located inside the trunk
behind the front access panel.
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
three sections, Refill Circuit, Heating Circuit, and Brewing Circuit.
Removal and Replacement:
1. Disconnect the black wire and blue wire from the
relay on the control board.
2. Disconnect the 8-pin connector and the 6-pin
connector from the main wiring harness.
3. Disconnect the 2-pin connector from the ready
indicator LED.
4. Remove the four #6-32 screws securing the control board to the component mounting bracket.
5. Remove the four spacers from the control board
and attach them to the new board.
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
marked by a square solder pad and pins 2,3 & 4 are
round.
7. Check the jumper on the brew temperature lockout jack for desired function (enabled or disabled).
8. Check the jumper on the temperature jack for
desired brew temperature. The factory setting
should be 200°F(95°C)
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 indicator LED.
11. Connect the 8-pin connector and the 6-pin connector from the main wiring harness.
12. Connect the blue wire and black wire to the relay on
the control board.
13. Refer to
tional Settings
CEZ-APS/TS/TSR Adjustments and Op-
to program the new control board.
Page 22
29253 030101
SERVICE (cont.)
SWITCH PANEL - Model CDBC-APS/TS/TSR
S/N
MANUFACTURED BY BUNN-O-MATIC CORPORATION
BUNN
SPRINGFIELD, ILLINOIS, U.S.A.
MODEL
VOLTS A.C. AMP WATTS
PHASE WIRE HERTZ
COVERED UNDER ONE OR MOREOF THE FOLLOWING PATENTS :
ONE OR MORE OTHER PATENTS MAY BE PENDING
FIG. 4 SWITCH PANEL
Location:
The Switch Panel is located in the front of the
hood.
P1916
Removal and Replacement:
1. Disconnect the 11-pin connector to the switch
panel from the control board.
2. Remove the four #6 screws, nylon washers and
the two #4-40 screws securing the control board
to the end cap assembly and set aside.
3. Gently pry the switch panel from the end cap
assembly.
4 Remove any adhesive that remains on the end cap.
5. Remove the adhesive backing from the new switch
panel. Insert the ribbon connector through the slot
in the end cap and apply the switch panel to the end
cap.
6. Install the control board to the back side of the end
cap using the four #6 screws, nylon washers and
the two #4-40 screws to the end cap assembly.
NOTE: The four nylon washers must be installed
under the heads of the four #6 screws to prevent
a possible shorting of the control board circuits.
7. Reconnect the 11-pin connector from the switch
panel to the control board making sure every pin
on the control board is inserted into the ribbon
cable plug.
Test Procedures:
The test procedures for the switch panel and the
control board will vary depending upon the problems
experienced by the brewer. Refer to the Troubleshooting guide beginning on page 9. The troubleshooting
guide is divided into three sections, Refill Circuit,
Heating Circuit, and Brewing Circuit.
Page 23
29253 071599
S/N
MANUFACTURED BY BUNN-O-MATIC CORPORATION
BUNN
SPRINGFIELD, ILLINOIS, U.S.A.
MODEL
VOLTS A.C. AMP WATTS
PHASE WIRE HERTZ
COVERED UNDER ONE OR MOREOF THE FOLLOWING PATENTS :
ONE OR MORE OTHER PATENTS MAY BE PENDING
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Page 24
SERVICE (cont.)
BREW SWITCH (Start) - Model CEZ-APS/TS/TSR
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ANUFACTURED BY BUNN
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SPRINGFIELD, ILLINOIS, U.S.A.
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Location:
The BREW switch is located in the center front of
the hood.
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.
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.
Page 25
SERVICE (cont.)
DISPENSE VALVE
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P1919
FIG. 9 DISPENSE VALVE
Location:
The dispense valve is located inside the top cover
behind the front end cap.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Check the water level in the tank to confirm that it
is within 1/2" from the top of the tank.
3. Connect the brewer to the power source. If the
brewer has been set for brewer temperature lockout, this feature must be disabled. See Page 8 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.
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 defective. Replace valve and test again to verify repair.
If voltage is not present as described, refer to
Diagrams
and check the brewer wiring harness. Also
Wiring
check the control board for proper operation. See
Pages 22 and 23.
Removal and Replacement:
1. Disconnect wires from the dispense valve.
2. Drain enough water from the tank so the dispense
valve is above the water level.
3. Remove water lines from the dispense valve.
4. Remove the two #8-32 nuts securing the dispense
valve to the sprayhead panel.
5. Install a new dispense valve using the two #8-32
nuts.
6. Reconnect water lines to the dispense valve and
secure in place with clamps.
7. Refer to FIG. 10 when reconnecting wires.
WHI/GRN from
Control Board
WHI from Terminal
Block
If the sound is heard as described, there may be a
blockage in the dispense valve or the water line to the
sprayhead. Remove the dispense valve and inspect for
wear, and remove waterborne particles.
If the sound is not heard as described, proceed to #6.
Page 26
P1853
FIG. 10 DISPENSE VALVE WIRING
29253 030101
N
O
I
N
T
A
R
O
P
R
O
C
.
C
I
A
T
.
S
A
N
.
M
U
-
,
O
S
-
I
N
O
N
N
I
U
L
B
L
I
Y
,
S
B
T
D
T
L
D
U
A
E
N
E
I
/
Z
F
W
R
S
T
U
G
R
T
N
:
I
E
C
R
S
H
A
T
P
F
S
N
U
E
N
T
A
P
A
M
P
M
B
A
G
E
N
I
R
I
W
W
O
L
L
O
F
.
C
E
.
H
A
T
L
E
S
F
D
T
O
L
O
E
G
O
M
R
N
E
V
I
O
S
D
M
A
N
H
R
E
P
P
O
E
E
B
N
O
Y
A
R
E
M
D
S
N
T
U
N
E
D
T
E
A
R
P
E
V
R
E
O
H
C
T
O
E
R
O
M
R
O
E
N
O
Page 27
SERVICE (cont.)
TANK HEATER
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
be 120 volts ac for two wire 120 volt models or 240
volts ac for three wire 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 the
Wiring Diagrams
and check wiring harness.
4. Disconnect the black wire and the white wire or red
wire from the tank heater terminals.
5. Check for continuity across the tank heater terminals.
If continuity is present as described, reconnect the
wires, the tank heater is operating properly.
If continuity is not present as described, replace the
tank heater.
NOTE- If the tank heater remains unable to heat,
remove and inspect heater for cracks in the sheath.
Removal and Replacement:
1. Remove the top cover or top warmer housing and
front access panel as previously described.
2. Disconnect the vent hose from the top of the tank
by pulling the elbow fitting from the grommet in
the top of the tank lid.
3. Drain water from the tank.
4. Disconnect the water supply tube to the dispense
valve from the side of the tank.
5. Disconnect the water supply tube to the solenoid
valve from the bottom of the tank.
6. On brewers with faucet, disconnect the outlet
water line to the faucet from the side of the tank.
7. Disconnect the temperature probe from the top of
the tank by pulling the probe from the grommet in
the top of the tank lid.
8. Disconnect the pink wire from the level probe.
9. Disconnect the green wire from the top of the tank.
10. Disconnect the limit thermostat from the side of
the tank.
11. Disconnect the two white wires from the tank
warmer blanket.
12. Disconnect the black wire and the white or red wire
from the tank heater terminals.
13. Remove the four #8-32 nuts securing the tank to
the mounting brackets and remove the tank assembly.
14. Remove the eight #8-32 nuts securing the tank lid
to the tank.
15. Remove the two hex nuts securing the tank heater
to the bottom of the tank. Remove tank heater with
gaskets and discard.
16. Install new tank heater with gaskets to the bottom
of the tank and secure with two hex nuts.
Page 28
29253 030101
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. Connect the limit thermostat to the front of the tank
assembly.
21. Connect the green wire to the tank mounting
bracket using #8-32 nut.
22. Connect the pink wire to the level probe.
23. Insert the temperature probe through the grommet in the tank lid.
24. Install the elbow fitting of the vent hose into the
grommet in the tank lid.
25. On brewers with faucet, connect the outlet water
line of the faucet to the side of the tank and secure
with clamp.
26. Connect the water supply tube from the solenoid
to the bottom of the tank and secure with clamp.
27. Connect the water supply tube from the dispense
valve to the side of the tank and secure with clamp.
28. Refer to FIG. 14 when reconnecting the tank heater
wires.
29. Install access panels and covers and refer to
Set-up
for refill and operation.
Initial
BLK to Control Board
WHI or RED to Terminal
Block
P1856
FIG. 14 TANK HEATER WIRING
Page 29
29253 071599
J1
1
M
R
T
2
M
R
T
J2
J3
J5
J4
J6
J7
Page 30
SCHEMATIC WIRING DIAGRAM CDBC-APS/TS/TSR
N
L1
LIMIT
BLK-14
BLK
J1-1
C
J1-2
O
COM
N
N.O.
T
R
J1-1
O
L
P
J1-5
C
B
O
A
J1-10
R
D
J2-1
THERMOSTAT
WHI
COUNTER
BLK
BLK
BLU-14
BLK-14
WHI
BLK
WHI/BLU
WHI/GRN
CONTROL PANEL ASSY
(OPTIONAL)
BREW SW
BLU-14
BLK-14
"KEEP WARM" HEATER
BLK
DISPENSE
WHI/GRN
TANK HEATER
GRN
SOL
GRN
WHI-14 (MODELS 15 & 20)
RED-14 (MODEL 35)
REFILL
WHI/BLU
SOL
WHI
WHI
WHI
WHI
WHI
L2
J2-6
J2-11
J3-1
J3-4
PNK
GRN
WHI
BLK
ON/OFF SW
HIDDEN SW
STATIC
SHIELD
120V AC 2 WIRE
120/208V AC 3 WIRE
120/240V AC 3 WIRE
LEVEL
PROBE
t°
SINGLE PHASE
29257.0000B 12/99 ©1998 BUNN-O-MATIC CORPORATION
Page 31
29253 071599
SCHEMATIC WIRING DIAGRAM CEZ-APS/TS/TSR
TANK HEATER
WHI
WHI
WHI
BREW SWITCH
29341.0000B 6/99 ©1998 BUNN-O-MATIC CORPORATION
Page 32
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