Bunn CDBCF, CD, CDBCP, CDF User Manual

BUNN

®

INTRODUCTION

This equipment will automatically brew a half-gallon batch of coffee into an awaiting decanter at the press of
a button. A hot water faucet is 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 Adjustments & Optional Settings................................................................ 7

CDBC Adjustments & Optional Settings............................................................. 8

Troubleshooting ................................................................................................. 9

Service............................................................................................................. 20

Wiring Diagrams.............................................................................................. 32

BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY

Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows:

1) All equipment other than as specified below: 2 years parts and 1 year labor.

2) Electronic circuit and/or control boards: parts and labor for 3 years.

3) Compressors on refrigeration equipment: 5 years parts and 1 year labor.

4) Grinding burrs on coffee grinding equipment to grind coffee to meet original factory screen sieve analysis: parts and labor for 3 years
or 30,000 pounds of coffee, whichever comes first.

These warranty periods run from the date of installation BUNN warrants that the equipment manufactured by it will be commercially
free of defects in material and workmanship existing at the time of manufacture and appearing within the applicable warranty period.
This warranty does not apply to any equipment, component or part that was not manufactured by BUNN or that, in BUNN’s judgment,
has been affected by misuse, neglect, alteration, improper installation or operation, improper maintenance or repair, damage or
casualty. This warranty is conditioned on the Buyer 1) giving BUNN prompt notice of any claim to be made under this warranty by
telephone at [phone] or by writing to Post Office Box 3227, Springfield, Illinois 62708-3227; 2) if requested by BUNN, shipping
the defective equipment prepaid to an authorized BUNN service location; and 3) receiving prior authorization from BUNN that the
defective equipment is under warranty.

THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARRANTY, WRITTEN OR ORAL, EXPRESS OR
IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF EITHER MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. The agents, dealers or employees of BUNN are not authorized to make modifications to this warranty or to

make additional warranties that are binding on BUNN. Accordingly, statements by such individuals, whether oral or written, do not
constitute warranties and should not be relied upon.

If BUNN determines in its sole discretion that the equipment does not conform to the warranty, BUNN, at its exclusive option while the
equipment is under warranty, shall either 1) provide at no charge replacement parts and/or labor (during the applicable parts and labor
warranty periods specified above) to repair the defective components, provided that this repair is done by a BUNN Authorized Service
Representative; or 2) shall replace the equipment or refund the purchase price for the equipment.

THE BUYER’S REMEDY AGAINST BUNN FOR THE BREACH OF ANY OBLIGATION ARISING OUT OF THE SALE OF THIS EQUIPMENT,
WHETHER DERIVED FROM WARRANTY OR OTHERWISE, SHALL BE LIMITED, AT BUNN’S SOLE OPTION AS SPECIFIED HEREIN, TO
REPAIR, REPLACEMENT OR REFUND.

In no event shall BUNN be liable for any other damage or loss, including, but not limited to, lost profits, lost sales, loss of use of
equipment, claims of Buyer’s customers, cost of capital, cost of down time, cost of substitute equipment, facilities or services, or any
other special, incidental or consequential damages.

Page 2

29079 042803

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

! WARNING

DO NOT OVERLOAD CIRCUIT.
ALWAYS ELECTRICALLY GROUND
THE CHASSIS OR ADAPTOR PLUG.
DO NOT DEFORM PLUG OR CORD.
FOLLOW NATIONAL AND LOCAL
ELECTRICAL CODES.
KEEP COMBUSTIBLES AWAY.

FAILURE TO COMPLY RISKS EQUIPMENT

DAMAGE, FIRE OR SHOCK HAZARD.

READ THE ENTIRE

OPERATING MANUAL BEFORE

USING THIS PRODUCT

00986.0000E 5/98 ©1994 Bunn-O-Matic Corporation

!

WARNING

DISCARD DECANTER
IF:

° CRACKED
° SCRATCHED
° BOILED DRY
° HEATED WHEN EMPTY

FUNNEL CONTENTS

ARE HOT

° USED ON HIGH FLAME
OR EXPOSED ELECTRIC
ELEMENTS

# 12364.0000

# 10044.0000

READ THE ENTIRE OPERATING MANUAL

BEFORE USING THIS PRODUCT

FAILURE TO COMPLY RISKS INJURY

PN: 00658.0000F 6/98 © 1985 BUNN-O-MATIC CORPORATION

Page 3

29079 041599

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 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 to reduce it to 50 psi. 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

29079 011700

OPERATING CONTROLS

Model CEZ

ON/OFF BREW FRONT-SIDE-REAR

ON/OFF SWITCH

Placing the "ON/OFF" switch in the "ON" upper position supplies
power to the brew station warmer, enables the brew circuit, and
energizes the tank refill circuit. Placing the switch in the "OFF" lower
position stops tank refilling and brewing and deenergizes the brew
station warmer. Stopping a brew cycle after it has been started will
not stop the flow of water into the decanter until the funnel is empty.

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.

Page 5

OPERATING CONTROLS (cont.)

ADDITIONAL WARMER SWITCHES (CDBC only)

Pressing any additional warmer switch so that the indicator is glowing, supplies power to the associated
warmer.

READY INDICATOR

This indicator glows when the preset temperature has been achieved. The word "NOT" above "READY" will glow
in all other instances.

TEMPERATURE INDICATORS (Feature disabled from the factory – refer to page 8.)

The indicator glows to communicate the brew water temperature. Two indicators will glow when the
temperature is between them.

INITIAL SET-UP

1. Insert an empty funnel into the funnel rails.

2. Place an empty decanter under the funnel.

3. Connect the brewer to the power source.

4. Model CDBC – Press the "ON/OFF" switch (indicator glowing).

Model CEZ – 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.

If brewer is not equipped with a faucet, place a empty decanter beneath the funnel and initiate a brew cycle.

8. Model CDBC – Place an empty decanter/server beneath the funnel and press the "ON/OFF" switch (indicator

glowing) then momentarily press and release the "BREW" switch.
Model CEZ – Place an empty decanter beneath the funnel and 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 decanter/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 fresh coffee grounds into the filter and level the bed of grounds by gently shaking.

3. Slide the funnel into the funnel rails.

4. Place an empty decanter/server beneath the funnel.

5. Model CDBC – Press the "ON/OFF" switch (indicator glowing) then momentarily press and release the "BREW"

switch.
Model CEZ – 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.

Page 6

29079 042803

POUR-OVER FEATURE

If the brewer is equipped with a pour-over feature, follow the instructions below.

1. Remove the thumbscrew and pour-in lid from the top cover of the brewer and set aside.

2. Insert a BUNN® filter into the funnel.

3. Pour fresh coffee grounds into the filter and level the bed of grounds by gently shaking.

4. Slide the funnel into the funnel rails.

5. Place an empty decanter beneath the funnel.

6. Measure 64 ounces of cold water in a container and slowly pour the water into the pour-in opening.

7. Press the ON/OFF button to activate the lower warmer (Indicator lamp on).
NOTE: Do not press the Brew Button. It is not necessary when using the pour-over feature.

8. When brewing is completed, simply discard the grounds and filter.

CLEANING

1. The use of a damp cloth rinsed in any mild, non-abrasive, liquid detergent is recommended for cleaning all
surfaces on Bunn-O-Matic equipment.

2. Check and clean the sprayhead. The sprayhead holes must always remain open.

Page 7

29079 042803

CEZ ADJUSTMENTS & OPTIONAL SETTINGS

Page 8

CDBC ADJUSTMENTS & OPTIONAL SETTINGS

HIDDEN

SWITCH

P1866

Setting Brew Temperature

The brewer is factory set to brew at 200°F (93˚C). To change this setting, press and hold the "HIDDEN" switch

beneath the "®". The word "TEMP" above the "ON/OFF" switch will glow to correspond with the temporary function
change of this switch. Repeatedly press and release the "ON/OFF" switch until one of the bank of temperature
indicators shows the approximate desired temperature. When two indicators are glowing, the temperature is
approximately the number between them.

Displaying Brew Temperature

The brewer is factory set with the temperature display disabled. To change this setting, press and hold the "ON/
OFF" switch and the "HIDDEN" switch beneath the "®" for five seconds, the entire bank of temperature indicators
will glow. Release both switches. Pressing and releasing the "ON/OFF" switch will toggle between turning the entire
bank of temperature indicators on-or-off, signifying the "ON" or "OFF" condition of this display. Wait for a few
seconds, the brewer will maintain this last setting.

Setting Brew Lockout

The brewer is factory set with the brew lockout disabled. Brew lockout prevents starting a brew cycle if the ready
indicator is not glowing. When an attempt at brewing cannot be allowed, the word "NOT" and "LOCKOUT" flash for
three seconds to indicate the reason the brew can't begin. To change the condition of the brew lockout, press and
hold the "HIDDEN" switch beneath the "®" and momentarily press the "BREW" switch.

Adjusting Automatic Warmer Shut-Off

The brewer is factory set with this feature disabled. The automatic warmer shut-off deenergizes all warmers
after a predetermined time period after the most recent brew cycle. To change the setting, press and hold the
"BREW" switch and the "HIDDEN" switch beneath the "®" for five seconds, the entire bank of temperature indicators
will flash on-and-off. Release both switches. Pressing and releasing the "BREW" switch will select the number of
temperature indicators from none to five. When no indicators are glowing, this feature is disabled and all warmers
will be controlled only by their respective switches. When one to five indicators are glowing, it indicates the
approximate number of hours of delay before all warmers will be automatically deenergized after the most recent
brew cycle.

IMPORTANT: The tank must be full and fill solenoid shut off prior to making these adjust­ments.
Adjusting Brew Volumes

CDBC & CEZ models are factory set to deliver 64 ounces ± 2 for each brew cycle.

Page 9

29079 042803

ADJUSTMENTS & OPTIONAL SETTINGS (cont.)

BREW VOLUME SET-UP: Use the following steps when the setting is unknown or a different circuit board is being

installed.

1. Place an empty funnel in the funnel rails and an empty decanter/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

decanter/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

decanter/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 10

29079 020103

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)

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)

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 & CEZ)

Make sure before servicing brewer that voltage is present at control board.

On CDBC models, press any warmer switch or observe if any indicator lights are glowing on the control panel.
If so, proceed with testing. If not, check for voltage across pins 1 & 2 of the ten pin J1 connector (black and
white wires). If voltage is present, replace the control board. If voltage is not present, check wiring and voltage
across terminal block (black and white). Correct the problem and retest before proceeding with testing.

On CEZ 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 11

29079 042803

TROUBLESHOOTING (cont.)

REFILL CIRCUIT

PROBABLE CAUSE REMEDYPROBLEM

Will not fill or refill

1. Power off to brewer (all models)

2. Water shut off (all models)

3. Display flashing (CDBC) or ready
light flashing (CEZ)

4. ON/OFF Switch (all models)

5. Lime build up on Probe (all
models)

6. Refill Valve or Control Board
(all models)

Press warmer switches on control
panel to determine if power is ON.

Make sure water is ON.

Brewer has shut down due to
malfunction (See Diagnostic Chart
in manual, Page 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 coil may be stuck
closed. Shut water off to brewer.
Set the ON/OFF switch to the "OFF"
position. Open the faucet and drain
water down in the tank until flow
stops or slows to a trickle. Attach
a voltmeter to the terminals of the
refill solenoid. Connect the brewer
to the power source. Press the
switch "ON". Within five seconds,
voltage should be present at the
solenoid terminals. If voltage is
not present, refer to the wiring
diagrams and check the wiring
harness.

Page 12

29079 042803

TROUBLESHOOTING (cont.)

REFILL CIRCUIT (cont.)

Fill or refill does not shut "OFF"
(ON/OFF Switch "ON")

PROBABLE CAUSE

1. Lime build up on probe (all
models)

2a. Water Level Probe Sensing
System (CDBC)

2b. Water Level Probe Sensing
System (CEZ)

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 (all
models)

1. Refill valve or control board (all
models)

Page 13

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)

29079 042803

TROUBLESHOOTING (cont.)

HEATING CIRCUIT
PROBLEM PROBABLE CAUSE

REMEDY

Water does not heat to proper
temperature

IMPORTANT: Make sure no tem­perature tests are taken before the
ready light is "ON". Tank tempera­ture must be stabilized before read­ings are taken.

1. Display flashing (CDBC) or ready
light flashing (CEZ)

2. Water not touching tempera­ture probe

3a. Dry Plug In Probe Sensing
System (CDBC)

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)

Page 14

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 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 4b.

29079 042803

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 (CDBC)

4b. Temperature Probe (CEZ)

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 (all models)

6. Tank Heater (all models)

1. Lime build up on temperature
probe, tank or tank heater

Page 15

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 (or Red termi­nal on 208/240 volt models) 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.

29079 042803

TROUBLESHOOTING (cont.)

HEATING CIRCUIT (cont.)

PROBLEM PROBABLE CAUSE REMEDY

Spitting or excessive steaming
(cont.)

2a. Temperature Probe (CDBC)

2b. Temperature Probe (CEZ)

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°Cº
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 (all models)

1. Plumbing lines

2. Water supply

3. Lime build up

Page 16

Set the temperature to 200°F
(93°C). Let tank temperature sta-

bilize. If temperature in tank is
above temperature setting by more

than 7°F(-14°C), replace the con-

trol 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.

29079 042803

TROUBLESHOOTING (cont.)

BREWING CIRCUIT

PROBLEM PROBABLE CAUSE REMEDY

Brew cycle will not start 1. Display flashing (CDBC) or ready

light flashing (CEZ)

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)

Page 17

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)

29079 042803

TROUBLESHOOTING (cont.)

BREWING CIRCUIT (cont.)

PROBLEM PROBABLE CAUSE REMEDY

Brew cycle will not start (cont.)

Consistently low beverage level in
the dispenser or beverage over­flows dispenser

8. Control board or dispense valve
(all models)

1. Brew volume (all models)

If the start switch (CEZ) or switch
panel (CDBC) is operating prop­erly, proceed as follows. Attach a
voltmeter to the terminals of the
dispense solenoid. Connect the
brewer to the power source. Turn
on the brewer and press the BREW
switch. Voltage should be present
at the solenoid terminals. If volt­age is not present, refer to the
wiring diagrams and check the
wiring harness. If voltage is
present, check for continuity
across the terminals of the sole­noid coil. If continuity is not
present, replace the solenoid (See
page 26). If continuity is present,
the valve may be stuck closed.

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.

-

2. Lime build up

3. Dispense Valve

Page 18

Inspect the dispense valve and
spray head for excessive lime de­posits. Delime as required.

Remove dispense valve and clear
any obstructions. Rebuild or re­place valve if necessary. (See page

26)

29079 020103

TROUBLESHOOTING (cont.)

BREWING CIRCUIT (cont.)

PROBLEM PROBABLE CAUSE REMEDY

Dripping from spray head

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 decanter beneath the
sprayhead. Initiate brew cycle and
check the water temperature im­mediately below the sprayhead
with a thermometer. The reading

must not be less than 195°F(91°C).

Adjust the temperature setting to
increase the water temperature.
Refer to

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 19

29079 030101

TROUBLESHOOTING (cont.)

BREWING CIRCUIT (cont.)

PROBLEM PROBABLE CAUSE REMEDY

Dry coffee grounds remain in the
funnel

Low beverage serving tempera­ture

1. Sprayhead

2. Funnel loading

1. Warmer

Make sure sprayhead is present
and holes are clear and unob­structed. There should be six sepa­rate streams of water coming out
of the sprayhead.

The BUNN® paper filter must be
centered in the funnel and the bed
of grounds leveled by shaking gen­tly.

Disconnect the brewer from the
power source. Remove the warmer
plate and turn upside down to ex­pose the warmer terminals. Re­move the two wires. Check for
continuity across the two warmer
terminals. If continuity is not
present, replace the warmer ele­ment (See page 31). If continuity
is present, reconnect the wires to
the warmer element. Check for
voltage at the warmer terminals.
Turn the warmer switch "ON". The
indicator light will come on. Volt­age should be present at the ter­minals. If not, disconnect power
supply and check wiring and
switch.

Page 20

29079 041599

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 (Is water shut "OFF")

Sheath of temperature probe dry for 10 minutes after power-up Temperature probe wiring

Fill valve wiring, function, & strainer
Green wire between tank and circuit board

2 Low Tank Level Fault - Water pressure (Is water shut "OFF")

Level probe dry for 7 minutes after fill valve is energized Shorting pin on J6 connector of control board not

on correct set of pins (CEZ only) See page 7.
Level probe wiring
Temperature probe wiring
Fill valve wiring, function, & strainer

3 Low Water Temperature Fault - Tank heater wiring & function

Sensor in tank is calling for heat for 30 minutes or more Temperature probe wiring

4 Tank Sensor Disagreement - Temperature probe wiring

Level probe detects water, but dry plug-in probe dry Level probe wiring

Green wire between tank and circuit board

5 Temp Sensor Out-of-Range - High Sensor not connected to circuit board

6 Temp Sensor Out-of-Range - Low Sensor wires shorted together or to chassis

Page 21

29079 042803

R
E
T

N

N
A

O

C

I

E

T

D

D

U

R
A

A

C

C

IS

D

:

!

IF

C

T
O

H

E

R

A

S
E
C

A

F

R

U

S

D

N

A

S
R
E

M

R

A

W

:

N
TIO
U

A

Page 22

SERVICE (cont.)

CONTROL BOARD - Model CDBC

T

O

H

E

R

A

S

E

C

A

F

R

U

S

D

N

A

S

R

E

M

R

A

W

:

N
O
I

T

U

A

C

P1846

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
three sections, Refill Circuit, Heating Circuit, and Brew­ing Circuit.

Page 23

SERVICE (cont.)

CONTROL BOARD - Model CEZ

A

C

T
O

H

E

R

A

S

E

C

A

F

R

U

S

D

N

A

S

R

E
M
R

A

W

:

N

IO

T

U

WARMERS AND SURFACES ARE HOT

:

N

IO

T

U

A

C

P1847

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.

Page 24

SERVICE (cont.)

SWITCH PANEL - Model CDBC

FIG. 4 SWITCH PANEL - CDBC

Location:

The Switch Panel is located in the front of the

hood.

P1848

Removal and Replacement:

1. Disconnect the 11-pin connector to the switch
panel from the control board.

2. Remove the four #6 screws, nylon washers and
the two #4-40 screws securing the control board
to the end cap assembly and set aside.

3. Gently pry the switch panel from the end cap
assembly.

4 Remove any adhesive that remains on the end cap.

5. Remove the adhesive backing from the new switch
panel. Insert the ribbon connector through the slot
in the end cap and apply the switch panel to the end
cap.

6. Install the control board to the back side of the end
cap using the four #6 screws, nylon washers and
the two #4-40 screws to the end cap assembly.
NOTE: The four nylon washers must be installed
under the heads of the four #6 screws to prevent
a possible shorting of the control board circuits.

7. Reconnect the 11-pin connector from the switch
panel to the control board making sure every pin
on the control board is inserted into the ribbon
cable plug.

Test Procedures:

The test procedures for the switch panel and the
control board will vary depending upon the problems
experienced by the brewer. Refer to the Troubleshoot­ing guide beginning on page 9. The troubleshooting
guide is divided into three sections, Refill Circuit,
Heating Circuit, and Brewing Circuit.

Page 25

29079 042803

SERVICE (cont.)

ON/OFF SWITCHES - Model CEZ

R
A

E

R

-

E
D
I

S

-

T

N

O

R

F

T

E HO

T

R

A

T

S AR

S

CE

R

E

W

O
L
/

N

ND SURFA

O

RMERS A

A

W

:

N

O

I

T

U

A

C

FIG. 5 ON/OFF SWITCHES

Location:

The ON/OFF switches are located on the front of

the hood.

P1849

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.

Removal and Replacement:

1. Remove the wires from the switch terminals.

2. Remove hose connected to faucet. Remove nut
securing faucet to brewer and remove faucet as­sembly.

3. Remove four nuts securing front end cap to brewer
and remove end cap.

4. Remove switch and replace with new switch.

5. Install front end cap and faucet assembly.

6. Refer to FIG. 6 when reconnecting the wires.

Test Procedure:

1. Disconnect the brewer from the power source.

2. Viewing the switch from the back remove the white
wire from the upper terminal and the black wire
from the center terminal.

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.

4. Disconnect the brewer from the power source.

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.

P1850

Page 26

FIG. 6 ON/OFF SWITCH WIRING

29079 071599

Page 27

SERVICE (cont.)

DISPENSE VALVE

WARMERS AND SURFACES ARE HOT

:

N

IO

T

U

A

C

P1852

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.

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.

WHI/GRN from
Control Board

WHI from Terminal
Block

P1853

Page 28

FIG. 10 DISPENSE VALVE WIRING

Page 29

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.

17. Install tank assembly onto mounting brackets and
secure in place with four #8-32 nuts.

Page 30

29079 030101

SERVICE (cont.)

TANK HEATER (Cont.)

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 31

29079 041599

SERVICE (cont.)

REFILL VALVE

P1857

If continuity is not present as described, replace the
refill valve.

6. Check the refill valve for coil action. Connect the
brewer to the power source. With "ON/OFF" switch
in the "ON' upper position press start switch and
listen carefully in the vicinity of the refill valve for
a" clicking" sound as the coil magnet attracts.

7. Disconnect the brewer from the power source.

If the sound is heard as described and water will not
pass through the refill valve, there may be a blockage
in the water line before the refill valve or, the solenoid
valve may require inspection for wear, and removal of
waterborne particles.
If the sound is not heard as described, replace the refill
valve.

Location:

The refill valve is located inside the trunk on the

lower center part of the component bracket.

Test Procedures:

1. Disconnect the brewer from the power source.

2. Disconnect the white and white/blue wires from
the refill valve. Set the "ON/OFF" switch in the "ON"
upper position.

3. With a voltmeter, check the voltage across the coil
wires. Connect the brewer to the power source.
The indication must be 120 volts ac for two wire
120 volt models and three wire 120/240 volt
models.

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

Diagrams

and check brewer wiring harness.

Wiring

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.

4. Remove the two 1/4"-20 screws securing the refill
valve mounting bracket to the component bracket.
Remove bracket and valve as an assembly.

5. Using two 1/4"-20 screws install the new refill
valve and bracket to the component bracket.

6. Securely fasten the water lines to and from the
valve.

7. Refer to FIG. 16 when reconnecting the wires.

5. Check for continuity across the refill valve coil
terminals.

If continuity is present as described, reconnect the
white and white/blue wires from the circuit board.

P1858

FIG. 16 REFILL VALVE WIRING

Page 32

SERVICE (cont.)

WARMER ELEMENT(S)

N

O

I

T

U

A

C

DISCARD DECANTER

!

IF:

P1859

FIG. 15 WARMER ELEMENTS

Location:

The warmer element(s) is located under the warmer

plate.

Test Procedures:

1. Disconnect the brewer from the power source.

2. Use the white wire from the terminal block and the

other bottom wire on the "ON/OFF" switch.

3. With a voltmeter, check voltage across the two

wires with the "ON/OFF" switch in the "ON" posi­tion. Connect the brewer to the power source.The
indication must be 120 volts ac for two wire 120
volt models and three wire 120/240 volt models.

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

Diagrams

and check brewer wiring harness.

Wiring

5. Check the continuity across the two terminals on
the warmer element.

If continuity is present as described, reconnect the two
wires to the warmer element.
If continuity is not present as described, replace the
warmer element.

Removal and Replacement:

1. Remove the three #4-40 screws securing the
warmer assembly to the brewer.

2. Lift the warmer assembly from the brewer.

3. Disconnect the two wires from the warmer ele­ment terminals.

4. Remove the two #8-32 nuts securing the warmer
element to the warmer plate.

5. Securely install new warmer element.

6. Reconnect the two wires to warmer element termi­nals.

7. Securely install warmer assembly on the brewer.

8. Refer to the

Wiring Diagrams

when reconnecting

the wires.

Page 33

29079 041599

SCHEMATIC WIRING DIAGRAM CDBC - 15, 20 & 35

N

L1

LIMIT

THERMOSTAT

WHI

J1-1

C

J1-2

O
N
T
R

J1-1

O
L

P

J1-5

C

B
O
A

J1-10

R
D

BLU-14

WHI/RED

BLU-14

"KEEP WARM" HEATER

BRN/BLK

VIO

WHI/RED

DISPENSE

P2

BRN/BLK

P3

P2

GRN

TANK HEATER

BREW STATION WARMER

(CONTROLLED BY ON/OFF SW)

SOL

FRONT WARMER

REAR WARMER

VIO

FRONT WARMER

WHI-14 (MODELS 15 & 20)

RED-14 (MODEL 35)

WHI

REFILL

SOL

P1

WHI

P1, P2, &

P3 ARE

PINS OF A

POLARIZED

THREE-PIN

CONNECTOR.

P1

WHI

WHI

WHI

WHI

WHI

WHI

WHI

L2

P3

29077.0000C 04/03 ©1998 BUNN-O-MATIC CORPORATION

REAR WARMER

Page 34

L1

BLK-14

SCHEMATIC WIRING DIAGRAM CEZ

GRN

LIMIT

THERMOSTAT

BLU-14

BLK-14

TANK HEATER

WHI-14 (MODELS 15 & 20)

RED-14 (MODEL 35)

N

L2

C
O
N
T
R
O
L

P

C

B
O
A
R
D

BLK

PNK

TRM-1
TRM-2

J1-1

J1-8
J5-1

J5-6

J7-1

J7-2

COM
N.O.

WHI

COUNTER (OPTIONAL)
BLK
BLK

BLU-14

BLK-14

WHI

WHI/BLU

WHI/GRN

BLK

WHI/RED

WHI/YEL
BLK

WHI

GRN

PNK
WHI/ORA

GRY

t°

"KEEP WARM" HEATER

REFILL

WHI/BLU

DISPENSE

WHI/GRN

B
L
K

P
R
O
B
E

BLK

B
L
K

BRN/BLK

VIO

WHI/RED

SOL

WHI/YEL

P2

P3

WHI/RED

SOL

START SWITCH

BRN/BLK

VIO

WHI/ORA

FRONT WARMER

W

REAR WARMER

BREW STATION WARMER

WHI

H

I

WHI

WHI

WHI

WHI

WHI

P1

WHI

WHI

WHI

WHI

P1, P2, & P3 ARE PINS OF A

POLARIZED THREE-PIN

CONNECTOR.

120V AC 2 WIRE
120/208V AC 3 WIRE
120/240V AC 3 WIRE

SINGLE PHASE

29076.0000D 4/99 ©1998 BUNN-O-MATIC CORPORATION

Page 35

29079 030101

SCHEMATIC WIRING DIAGRAM CDBCP/CDBCPF - 15, 20 & 35

N

L1

O
N

R
O

O

R
D

C

T

L

P

C

B

A

BLK

TRM-1
TRM-2

J1-1

J1-5

J1-10

J2-1

BLK-14

COM
N.O.

WHI

RED
BLK

BLU-14

BLK-14

WHI

BLK

BRN/BLK

WHI/BLU

WHI/RED
YEL

WHI/VIO

VIO

WHI/GRN

BREW SW

ON/OFF SW

LIMIT

THERMOSTAT

CONTROL PANEL ASSY

LT FRNT SW

TOP FRNT SW

W/Flashing Lamp (Freshness)

BLU-14

"KEEP WARM" HEATER

LT REAR SW

TOP REAR SW

BLK-14

WHI/GRN

BRN/BLK

P2

P3

VIO

P2

YEL YEL

TANK HEATER

BREW STATION WARMER

WHI/RED

DISPENSE

BRN/BLK

(SEE TABLE BELOW FOR USAGE)

VIO

(CONTROLLED BY ON/OFF SW)

SOL

WARMER ASSY "A"

FRONT WARMER

REAR WARMER

WARMER ASSY "B"

FRONT WARMER

GRN

WHI-14 (MODELS 15 & 20)

RED-14 (MODEL 35)

WHI

REFILL

WHI/BLU

WHI

W

H

I

WHI

SOL

P1

P1, P2, &

P3 ARE

PINS OF A

POLARIZED

THREE-PIN

CONNECTOR.

P1

WHI

WHI

WHI

WHI

WHI

WHI

L2

J2-6

J2-11

J3-1

J3-4

J5-1

HIDDEN SW

STATIC

SHIELD

PNK
GRN
WHI

RT REAR SW

(NOTE – ALL WARMERS ARE NOT

AVAILABLE ON ALL MODELS!)

BLK

BLK

120V AC 2 WIRE
120/208V AC 3 WIRE
120/240V AC 3 WIRE

SINGLE PHASE

RT FRNT SW

t°

(SEE TABLE BELOW FOR USAGE)

P3

WHI/VIO

LEVEL
PROBE

29077.0002B 04/03 ©2002 BUNN-O-MATIC CORPORATION

WHI/VIO

(ALL CONFIGURATIONS INCLUDE BREW STATION WARMER)

WITH TOP WARMERS
WITH LEFT WARMERS
WITH RIGHT WARMERS
WITH LEFT & RIGHT WARMERS
WITH LEFT & TOP WARMERS
WITH RIGHT & TOP WARMERS

REAR WARMER

WARMER WIRING REFERENCE

W

H

I

LEFT

–

"B"

–
"B"
"B"

–

TOP

"A"

–
–

–
"A"
"A"

RIGHT

–

–
"A"
"A"

–
"B"

Page 36

29079 042803