Bunn CDBCP, S-N CDBC020213, CDBCF, CDBCFP User Manual

SCHEMATIC WIRING DIAGRAM

SINGLE CD - 15, 20 & 35

1.16 Mb

CDBC, CDBCF

CDBCP, CDBCFP

S/N CDBC020213 & up

SINGLE CD, SINGLE CDF

CAUTION

DISCONTINUED VERSION

The information in this manual

is no longer current.

OPERATING & SERVICE MANUAL

BUNN-O-MATIC CORPORATION

POST OFFICE BOX 3227

SPRINGFIELD, ILLINOIS 62708-3227

PHONE: (217) 529-6601	FAX: (217) 529-6644
35582.0000C 02/04 ©2003 Bunn-O-Matic Corporation	www.bunnomatic.com

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 .......................................................................................................	6
Pour-Over Feature ............................................................................................................................	7
Cleaning ...........................................................................................................................................	7
CDBC, SINGLE CD Adjustments & Optional Settings .......................................................................	8
CDBC, SINGLE CD Water Sensing Threshold Adjustment Procedure ..............................................	9
CDBC, SINGLE CD Pulse Brew Setup Procedure ...........................................................................	10
Troubleshooting .............................................................................................................................	11
Service...........................................................................................................................................	22
Wiring Diagrams ............................................................................................................................	31
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 (217) 529-6601 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.

BUNN, CDBC, and CDBCF, CDBCP, CDBCFP, SINGLE CD, and SINGLE CDF are either trademarks or registered trademarks of Bunn-O-Matic Corporation.

Page 2	35582 08263

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	! 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

#00656.0000

#00658.0000

!	WARNING
		DISCARD DECANTER
		IF:
		° CRACKED
		° SCRATCHED
		° BOILED DRY
		° HEATED WHEN EMPTY
FUNNEL CONTENTS		° USED ON HIGH FLAME
FUNNEL CONTENTS		OR EXPOSED ELECTRIC
ARE HOT		ELEMENTS

READ THE ENTIRE OPERATING MANUAL

BEFORE USING THIS PRODUCT

FAILURE TO COMPLY RISKS INJURY

# 12364.0000

# 10044.0000

Page 3	35582 041503

ELECTRICAL REQUIREMENTS

CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up.

Model 15 has an attached cordset and requires 2-wire grounded service rated 120 volts ac, 15 amp, single phase, 60 Hz.

WHITE		L2 RED
WHITE
NEUTRAL		120V.A.C.
NEUTRAL	120V.A.C.	WHITE
L1 BLACK	120V.A.C.	208 or 240V.A.C.
		208 or 240V.A.C.
		NEUTRAL
		120V.A.C.
		L1 BLACK

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:

Electrical Hook-Up

CAUTION – Improper electrical installation will damage electronic components.

1.An electrician must provide electrical service as specified.

2.Using a voltmeter, check the voltage and color coding of each conductor at the electrical source.

3.Remove the front panel beneath the sprayhead.

4.Feed the cord through the strain relief and connect it to the terminal block.

5.Connect the brewer to the power source and verify the voltage at the terminal block before proceeding. Replace the front panel.

6.If plumbing is to be hooked up later be sure the brewer is disconnected from the power source. If plumbing has been hooked up, the brewer is ready for Initial Set-Up.

PLUMBING REQUIREMENTS

These brewers must be connected to a cold water system with operating pressure between 5 and 90 psi (34.5 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	35582 091503

OPERATING CONTROLS

P1626

(CDBC models)

ON/OFF SWITCH

Pressing the "ON/OFF" switch (indicator glowing) supplies power to the brew station warmer, enables the brew circuit, and energizes the tank refill circuit. Pressing the switch again (indicator not glowing) 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 "ON/OFF" indicator is not glowing because the tank will not refill.

TEMP

P 2642

(SINGLE CD models)

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.

BATCH SLECTORS (SINGLE CD only)

Pressing a batch size switch (1/2 gal. or 1 gal.) so the indicator is glowing will set the brewer to deliver the desired brew volume.

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

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

Page 5	35582 041503

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 SINGLE CD - Press the "1 gal" switch (indicator glowing) and the "ON/OFF" switch (indicator glowing).

5.Water will flow into the tank and stop when the tank is filled to its capacity.

6.Wait approximately twenty minutes for the water in the tank to heat to the proper temperature.

7.To remove expansion water, 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.Place an empty decanter/server beneath the funnel and press the "ON/OFF" switch (indicator glowing) 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 for CDBC models and 128 ounces ±2 for SINGLE CD models. Refer to the adjustments section of this manual should the volume need to be increased or decreased.

10.Model SINGLE CD only press the "1/2 gal." switch, place an empty server beneath the funnel and press and

release the "BREW" switch. 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 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 SINGLE CD - Select 1/2 or 1 Gallon setting then momentarily press and release the "BREW" switch.

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

Page 6	35582 041503

POUR-OVER FEATURE

Models CDBCP & CDBCFP

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. NOTE: When using pour-over feature to brew a 1 gal. batch, pour in 64 ounces of cold water and wait until drip out of funnel is complete then pour in 64 more ounces of cold water.

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	35582 041503

CDBC, SINGLE CD 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.

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 of 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 models are factory set to deliver 64 ounces ± 2 for each brew cycle.

SINGLE CD models are factory set to deliver 128 ounces ± 2 for each brew cycle when 1 gal. option is selected and 64 ounces ± 2 for each brew cycle when 1/2 gal. option is selected.

Page 8	35582 041503

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 10 seconds). Release the button.

4.Allow the cycle to continue until the desired amount of water is dispensed and then turn "OFF" the brewer. The brewer is now set to dispense this amount of water for each subsequent brew cycle.

To increase the amount of water for each brew cycle place an empty funnel in the funnel rails and an empty decanter/server or graduated vessel beneath the funnel. Press the "ON/OFF" switch. Press and hold the "BREW" switch until you hear the solenoid click on-and-off three times (approximately 10 seconds), then release the "BREW" switch. Momentarily press and release the "BREW" switch once for each ounce (approximate) of water to be added to the prior setting and allow the brew cycle to finish.

To decrease the amount of water for each brew cycle place an empty funnel in the funnel rails and an empty 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 10 seconds), then release the "BREW" switch and allow the cycle to finish.

NOTE: For Model SINGLE CD, set 1/2 gallon and 1 gallon separately.

WATER SENSING THRESHOLD ADJUSTMENT PROCEDURE

1.Make sure the tank is full of water to be used for calibration. The water must be in contact with the refill probe.

2.Unplug the brewer from the power source, then press and hold the BREW button while power is reapplied.

3.Continue pressing the BREW button until the READY indicator begins to flash. Release the BREW button and then press it again momentarily.

4.The new calibration is automatically completed within a few seconds. If the water is too pure for use with the brewer, the READY indicator will flash very rapidly and the old calibration will be retained.

Page 9	35582 021604

PULSE BREW SETUP PROCEDURE (CDBC & SINGLE CD)

The pulse brew parameters (initial fill time, off times, and remaining on times) are entered using the following set- by-example process.

1.First set the brew volume using the standard procedure in Brew Volume Setup.

2.Position an empty container under the sprayhead. Allow the tank to finish refilling. Make sure that the READY lamp is on, or that the BREW LOCKOUT function is turned off.

3.Press and hold the OFF/ON button. The brew valve will turn on after 10 seconds. Release the button. This begins the initial on-time setting. When the spray has continued for the desired time, momentarily press the OFF/ON button.

4.The spray is now stopped and the off time setting has begun. Press the OFF/ON button momentarily to end the off time.

5.The spray is now on again and the remaining on time setting has begun. Press the OFF/ON button momentarily at the end of the desired remaining on time.

6.The setup is now complete and the parameters are stored in memory. The spray will continue the off and on cycles until the brew volume of step 1 is complete. Pressing the OFF/ON button again will terminate the brewing cycle, with the parameters stored in memory.

7.If only a preinfusion is desired, i.e. an initial on time followed by one off period, use the same procedure, but stop after step 4 and allow the brew to finish the volume set in step 1. This will store the initial on time and off time in memory.

Procedure for Disabling Pulse Brew or Preinfusion:

1.Position an empty container under the sprayhead. Allow the tank to finish refilling. Make sure that the READY lamp is on, or that the BREW LOCKOUT function is turned off.

2.Press and hold the OFF/ON button. The brew valve will turn on after 10 seconds. Release the button.

3.Allow the spray to continue and press no buttons until spray stops. The pulse and preinfusion functions are

now disabled.

NOTE: When the brewer has been set up for pulse or preinfusion, the adjustment of brew volume is done the same as always and has no effect on the pulse brew parameters. The pulsing is temporarily disabled while adjusting the brew volume and automatically returns during normal brewing.

Page 10	35582 041503

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:

Control Boards

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.

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

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

Page 11	35582 041503

TROUBLESHOOTING (cont.)
REFILL CIRCUIT
PROBLEM	PROBABLE CAUSE
Will not fill or refill	1.	Power off to brewer
	2.	Water shut off
	3.	Display flashing

4. ON/OFF Switch

5. Lime build up on Probe

6. Refill Valve or Control Board

7. Water is too conductive for proper operation when using the factory setting of sensing threshold.

REMEDY

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 21, 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 29). If continuity is present, the coil may be stuck closed. Shut water off to brewer. Set the ON/OFF switch to the "OFF" position. Open the faucet and drain water down in the tank until flow stops or slows to a trickle. Attach a voltmeter to the 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.

Reset the Water Sensing Threshold Adjustment Procedures on page 9.

Page 12	35582 041503

TROUBLESHOOTING (cont.)

REFILL CIRCUIT (cont.)

PROBLEM

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

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

PROBABLE CAUSE

1.Lime build up on probe

2.Water Level Probe Sensing System

3. Refill valve or control board

4. Water is too conductive for proper operation when using the factory setting of sensing threshold.

1. Refill valve or control board

REMEDY

Remove Probe and check for lime deposits on tip. Clean and reinstall.

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.

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 29)

Reset the Water Sensing Threshold Adjustment Procedures on page 9.

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 page 23)

Page 13	35582 091503

TROUBLESHOOTING (cont.)

HEATING CIRCUIT

PROBLEM

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.

PROBABLE CAUSE

1.Display flashing

2.Water not touching temperature probe

3.Dry Plug In Probe Sensing System

REMEDY

Brewer has shut down due to malfunction (See Diagnostic Chart in manual, Page 21, or under top lid).

Remove probe and grommet. Look into hole on tank lid. Water must be within one inch from top of tank.

Disconnect the brewer from the power source. Disconnect the J3 connector from the control board. Check for continuity from the tank mounting screw where the green wire mounts, to pin 2 of the plug, continuity should be present. Pull the temperature probe up about an inch from the grommet. Check for continuity from the outside surface of the temperature probe and pin 4 of the plug, continuity should be present. Connect the J3 plug to the control board and proceed to step 4.

Page 14	35582 091503

TROUBLESHOOTING (cont.)
HEATING CIRCUIT (cont.)
PROBLEM		PROBABLE CAUSE
Water does not heat to proper		4. Temperature Probe
temperature (cont.)
IMPORTANT: Make sure no tem-
perature tests are taken before the
ready light is "ON". Tank tempera-
ture must be stabilized before read-
ings are taken.

5. Limit Thermostat

6. Tank Heater

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

REMEDY

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.

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 26)

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 27)

Inspect probe and tank assembly for excessive lime deposits. Delime as required.

Page 15	35582 041503

TROUBLESHOOTING (cont.)
HEATING CIRCUIT (cont.)
PROBLEM		PROBABLE CAUSE
Spitting or excessive steaming		2. Temperature Probe
(cont.)

3. Control Board

Brewer is making unusual noises	1.	Plumbing lines
	2.	Water supply
	3.	Lime build up

REMEDY

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.

Set the temperature to 200°F (93°C). Let tank temperature stabilize. If temperature in tank is above temperature setting by more than 7°F(3.9°C), replace the control board.(See page 23)

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.

Page 16	35582 041503

TROUBLESHOOTING (cont.)
BREWING CIRCUIT
PROBLEM		PROBABLE CAUSE
Brew cycle will not start		1. Display flashing

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

7. Switch panel

REMEDY

Brewer has shut down due to malfunction (See Diagnostic Chart in manual, Page 21, 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 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.

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 24)

Page 17	35582 041503

TROUBLESHOOTING (cont.)
BREWING CIRCUIT (cont.)
PROBLEM	PROBABLE CAUSE	REMEDY
Brew cycle will not start (cont.)	8. Control board or dispense valve	If the switch panel is operating
		properly, proceed as follows. At-
		tach 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 sole-
		noid coil. If continuity is not
		present, replace the solenoid (See
		page 25). If continuity is present,
		the valve may be stuck closed.

Consistently low beverage level in	1. Brew volume
the dispenser or beverage over-
flows dispenser

Set up brewer according to instructions in section Adjustments- Brew Volumes. (See page 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	Inspect the dispense valve and
		spray head for excessive lime de-
		posits. Delime as required.
3.	Dispense Valve	Remove dispense valve and clear
		any obstructions. Rebuild or re-
		place valve if necessary. (See page
		25)

Page 18	35582 041503

TROUBLESHOOTING (cont.)
BREWING CIRCUIT (cont.)
PROBLEM	PROBABLE CAUSE	REMEDY
Dripping from spray head	1. Lime build up	Inspect the tank assembly for ex-
		cessive lime deposits. Delime as
		required.
	2. Dispense valve	Remove the dispense valve and
		clear any obstructions. Rebuild or
		replace the valve if necessary.(See
		page 25)
Weak beverage	1. Sprayhead	A clean spray-head must be used
		for proper extraction.
	2. Water temperature	Place an empty brew funnel on an
		empty decanter beneath the
		sprayhead. Initiate brew cycle and
		check the water temperature im-
		mediately 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	BUNN® paper filters must be used
		for proper extraction.
	4. Coffee grind	A fine drip or grind must be used
		for proper extraction.
	5. Funnel loading	The BUNN® paper filter must be
		centered in the funnel and the bed
		of grounds leveled by shaking
		gently.

Page 19	35582 041503

TROUBLESHOOTING (cont.)
BREWING CIRCUIT (cont.)
PROBLEM	PROBABLE CAUSE	REMEDY
Dry coffee grounds remain in the	1. Sprayhead	Make sure sprayhead is present
funnel		and holes are clear and unob-
		structed.
	2. Funnel loading	The BUNN® paper filter must be
		centered in the funnel and the bed
		of grounds leveled by shaking gen-
		tly.
Low beverage serving tempera-	1. Warmer	Disconnect the brewer from the
ture		power source. Remove the warmer
		plate and turn upside down to ex-
		pose the warmer terminals. Re-
		move the two wires. Check for
		continuity across the two warmer
		terminals. If continuity is not
		present, replace the warmer ele-
		ment (See page 30). If continuity
		is present, reconnect the wires to
		the warmer element. Check for
		voltage at the warmer terminals.
		Turn the warmer switch "ON". The
		indicator light will come on. Volt-
		age should be present at the ter-
		minals. If not, disconnect power
		supply and check wiring and
		switch.

Page 20	35582 041503

DIAGNOSTICS

The bank of temperature indicators 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	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	35582 041503

SERVICE

This section provides procedures for testing and replacing various major components used in this brewer should service become necessary. Refer to Troubleshooting for assistance in determining the cause of any problem.

WARNING - Inspection, testing, and repair of 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, front access panel and warmer plate(s).

The top cover is attached with one #4-40 screw.

The front access panel is attached with four #6-32 screws.

Each warmer assembly is attached with three #4- 40 screws.

Contents
Control Board - CDBC & SINGLE CD .................	23
Switch Panel - CDBC & SINGLE CD ..................	24
Dispense Valve ..................................................	25
Limit Thermostat ...............................................	26
Tank Heater .......................................................	27
Refill Valve .........................................................	29
Warmer Elements ..............................................	30
Wiring Diagrams ...............................................	31

P2675

FIG. 1 COMPONENT ACCESS

Page 22	35582 041503

SERVICE (cont.)

CONTROL BOARD

P1846

FIG. 2 CONTROL BOARD

Location:

The Control Board is located inside the top cover behind the front end cap.

Test Procedures:

The test procedures for the control board will vary depending upon the problems experienced by the brewer. Refer to the Troubleshooting guide beginning on page 9. The troubleshooting guide is divided into 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 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 #4- 40 screws to the end cap assembly.

NOTE: The four nylon washers must be installed under the heads of the four #6 screws to prevent a possible shorting of the control board circuits.

6.Connect the 11-pin connector from the control panel.

7.Connect the 10-pin connector and the 4-pin connector from the main wiring harness.

8.Connect the blue wire and black wire to the relay on the control board.

9.Refer to CDBC , SINGLE CD Adjustments and Optional Settings to program the new control board.

Page 23	35582 041503

SERVICE (cont.)

SWITCH PANEL

P1848

FIG. 3 SWITCH PANEL

Location:

The Switch Panel is located in the front of the hood.

Test Procedures:

The test procedures for the switch panel and the control board will vary depending upon the problems experienced by the brewer. Refer to the Troubleshooting guide beginning on page 11. The troubleshooting guide is divided into three sections, Refill Circuit, Heating Circuit, and Brewing Circuit.

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.

4Remove 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.

Page 24	35582 041503

SERVICE (cont.)

DISPENSE VALVE

P1852

FIG. 4 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.

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.

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 Wiring Diagrams and check the brewer wiring harness. Also check the control board for proper operation. See Page 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. 5 when reconnecting wires.

WHI/GRN from

Control Board

WHI from Terminal

Block

P1853

FIG. 5 DISPENSE VALVE WIRING

Page 25	35582 041503

SERVICE (cont.)

LIMIT THERMOSTAT

P1854

FIG. 6 LIMIT THERMOSTAT

Location:

The limit thermostat is located inside the front access panel on the front side of the tank.

Test Procedures:

1.Disconnect the brewer from the power source.

2.Disconnect the blue and black wires from the limit thermostat.

3.With an ohmmeter, check for continuity across the limit thermostat terminals.

If continuity is present as described, the limit thermostat is operating properly.

If continuity is not present as described, replace the limit thermostat.

Removal and Replacement:

1.Remove the black and blue wires from limit thermostat terminals.

2.Carefully slide the limit thermostat out from under the retaining clip and remove limit thermostat.

3.Carefully slide the new limit thermostat into the retaining clip.

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

BLU from Control

Board

BLK from Terminal

Block

P1800

FIG. 7 LIMIT THERMOSTAT WIRING

Page 26	35582 041503

SERVICE (cont.)

TANK HEATER

P1855

FIG. 8 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 27	35582 041503

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. 9 when reconnecting the tank heater wires.

29.Install access panels and covers and refer to Initial Set-up for refill and operation.

BLK to Control Board

WHI or RED to Terminal

Block

P1856

FIG. 9 TANK HEATER WIRING

Page 28	35582 041503

SERVICE (cont.)

REFILL VALVE

P1857

FIG. 10 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 Wiring Diagrams and check brewer wiring harness.

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.

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.

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. 11 when reconnecting the wires.

WHI from Terminal

Block

WHI/BLU from

Control Board

P1858

FIG. 11 REFILL VALVE WIRING

Page 29	35582 041503

SERVICE (cont.)

WARMER ELEMENT(S)

P2675

FIG. 12 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 Wiring Diagrams and check brewer wiring harness.

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 30	35582 041503

SCHEMATIC WIRING DIAGRAM CDBC - 15, 20 & 35

GRN

LIMIT

THERMOSTAT

TANK HEATER

WHI-14 (MODELS 15 & 20)

BLK-14

BLU-14

BLK-14

RED-14 (MODEL 35)

WHI

"KEEP WARM" HEATER

WHI

BLK

BREW STATION WARMER

WHI/RED

(CONTROLLED BY ON/OFF SW)

WHI

COUNTER

REFILL

(OPTIONAL)

WHI

J1-1

BLK

WHI/BLU

SOL

BLK

DISPENSE

J1-2

COM

BLU-14

WHI/GRN

SOL

WHI

N.O.

BLK-14

WHI

J1-1

WARMER ASSY "A"

BLK

BRN/BLK

FRONT WARMER

WHI

J1-5

WHI/BLU

WHI/RED

(SEE TABLE BELOW FOR USAGE)

P1, P2, &

YEL

P3 ARE

WHI/VIO

REAR WARMER

VIO

PINS OF A

VIO

POLARIZED

WHI/GRN

J1-10

THREE-PIN

CONTROL PANEL ASSY

WARMER ASSY "B"

CONNECTOR.

J2-1

BREW SW

LT FRNT SW

LT REAR SW

YEL

FRONT WARMER

WHI

	ON/OFF SW		TOP FRNT SW	TOP REAR SW		(SEE TABLE BELOW FOR USAGE) W
					P3		REAR WARMER	H
J2-6				WHI/VIO	P3	WHI/VIO	REAR WARMER	I
J2-6	HIDDEN SW		RT REAR SW	WHI/VIO		WHI/VIO
	HIDDEN SW		RT REAR SW	RT FRNT SW			WARMER WIRING REFERENCE
							WARMER WIRING REFERENCE
						(ALL CONFIGURATIONS INCLUDE BREW STATION WARMER)
	STATIC	(NOTE – ALL WARMERS ARE NOT						LEFT	TOP	RIGHT
J2-11	SHIELD		AVAILABLE ON ALL MODELS!)			WITH TOP WARMERS		–	"A"	–
						WITH LEFT WARMERS		"B"	–	–
J3-1	PNK					WITH RIGHT WARMERS		–	–	"A"
	PNK					WITH LEFT & RIGHT WARMERS		"B"	–	"A"
	GRN
	GRN
	WHI		LEVEL			WITH LEFT & TOP WARMERS		"B"	"A"	–
J3-4	BLK		LEVEL			WITH RIGHT & TOP WARMERS		–	"A"	"B"
J3-4			PROBE
			PROBE
J5-1	BLK						120V AC 2 WIRE
J5-1							120V AC 2 WIRE
			t°				120/208V AC 3 WIRE
							120/240V AC 3 WIRE
	29077.0000C 04/03			©1998 BUNN-O-MATIC CORPORATION			SINGLE PHASE
	29077.0000C 04/03			©1998 BUNN-O-MATIC CORPORATION

Page 31	35582 041503

SCHEMATIC WIRING DIAGRAM CDBCP/CDBCPF - 15, 20 & 35
L1	W/Flashing Lamp (Freshness)	N	L2
	W/Flashing Lamp (Freshness)	GRN

		LIMIT
		THERMOSTAT	BLU-14	BLK-14	TANK HEATER		WHI-14 (MODELS 15 & 20)
	BLK-14				TANK HEATER		WHI-14 (MODELS 15 & 20)
	BLK-14						RED-14 (MODEL 35)
							RED-14 (MODEL 35)
		WHI		"KEEP WARM" HEATER				WHI
BLK		WHI						WHI
BLK						BREW STATION WARMER
						BREW STATION WARMER
					WHI/RED	(CONTROLLED BY ON/OFF SW)			WHI
					WHI/RED				WHI
								REFILL
	TRM-1	RED					WHI/BLU	SOL	WHI
C	TRM-1	BLK			DISPENSE			SOL
C	TRM-2	BLK			DISPENSE
O	COM	BLU-14		WHI/GRN	SOL				WHI
N	N.O.	BLK-14			SOL
T	N.O.	WHI
R	J1-1	WHI
O	J1-1	BLK
O		BLK
L									WHI

P		BRN/BLK
	J1-5	WHI/BLU

C		WHI/RED

		YEL

BWHI/VIO

OVIO

J1-10

WHI/GRN

CONTROL PANEL ASSY

J2-1

BREW SW

LT FRNT SW

LT REAR SW

ON/OFF SW

TOP FRNT SW

TOP REAR SW

J2-6	RT REAR SW	RT FRNT SW
HIDDEN SW

			WARMER ASSY "A"
	P2	BRN/BLK		FRONT WARMER	WHI	P1	WHI
BRN/BLK		BRN/BLK			WHI		WHI
		(SEE TABLE BELOW FOR USAGE)			W		P1, P2, &
		(SEE TABLE BELOW FOR USAGE)			H		P3 ARE
VIO	P3	VIO		REAR WARMER	I		PINS OF A
	P3			REAR WARMER			PINS OF A
							POLARIZED
							POLARIZED
			WARMER ASSY "B"				THREE-PIN
			WARMER ASSY "B"				CONNECTOR.
							CONNECTOR.
YEL	P2	YEL		FRONT WARMER	WHI	P1	WHI
YEL		YEL			WHI		WHI
		(SEE TABLE BELOW FOR USAGE)			W
WHI/VIO P3		WHI/VIO REAR WARMER			H
WHI/VIO P3		WHI/VIO REAR WARMER			I

J2-11	STATIC	(NOTE – ALL WARMERS ARE NOT
	SHIELD	AVAILABLE ON ALL MODELS!)

J3-1	PNK
J3-1	GRN
	GRN
	WHI	LEVEL
J3-4	BLK	LEVEL
J3-4		PROBE
		PROBE
J5-1	BLK
J5-1
		t°

WARMER WIRING REFERENCE

(ALL CONFIGURATIONS INCLUDE BREW STATION WARMER)

	LEFT	TOP	RIGHT
WITH TOP WARMERS	–	"A"	–
WITH LEFT WARMERS	"B"	–	–
WITH RIGHT WARMERS	–	–	"A"
WITH LEFT & RIGHT WARMERS	"B"	–	"A"
WITH LEFT & TOP WARMERS	"B"	"A"	–
WITH RIGHT & TOP WARMERS	–	"A"	"B"

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

Page 32	35582 041503

LIMIT

THERMOSTAT

TANK HEATER

WHI-14 (MODELS 15 & 20)

BLK-14

BLU-14

BLK-14

RED-14 (MODEL 35)

WHI

"KEEP WARM" HEATER

WHI

BLK

BREW STATION WARMER

WHI/RED

(CONTROLLED BY ON/OFF SW)

WHI

COUNTER

REFILL

(OPTIONAL)

WHI

TRM1

BLK

WHI/BLU

SOL

BLK

DISPENSE

TRM2

COM

BLU-14

WHI/GRN

SOL

WHI

N.O.

BLK-14

WHI

J1-1

BLK

BRN/BLK

WHI

J1-5

WHI/BLU

WHI/RED

VIO

P1, P2, &

YEL

P3 ARE

WHI/VIO

PINS OF A

VIO

POLARIZED

WHI/GRN

J1-10

THREE-PIN

CONTROL PANEL ASSY

YEL

CONNECTOR.

J2-1

BREW SW

WHI/VIO

WHI

ON/OFF SW

NO CONNECTION THIS APPLICATION

J2-6

HIDDEN SW

1 GAL

1/2 GAL

J2-11

STATIC

(NOTE – ALL WARMERS ARE NOT

SHIELD

AVAILABLE ON ALL MODELS!)

J3-1

PNK

120V AC 2 WIRE

GRN

120/208V AC 3 WIRE

WHI

LEVEL

J3-4

BLK

120/240V AC 3 WIRE

PROBE

J5-1

BLK

SINGLE PHASE

t°

BUNN-O-MATIC CORPORATION

Page 33	35582 041503

L1	SCHEMATIC WIRING DIAGRAM
	L2

CDBCP DB/CDBCFP DB

MAIN POWER

GRN

SWITCH

LIMIT

THERMOSTAT

TANK HEATER

RED-14

BLK-14

BLU-14

BLK-14

WHI

"KEEP WARM" HEATER

WHI

BREW STATION WARMER

BLK

WHI/RED

(CONTROLLED BY ON/OFF SW)

RED

COUNTER

WHI

REFILL

(OPTIONAL)

J1-1

BLK

WHI/BLU

SOL

RED

BLK

DISPENSE

J1-2

COM

BLU-14

WHI/GRN

SOL

WHI

N.O.

BLK-14

RED

J1-1

WARMER ASSY "A"

BLK

BRN/BLK

FRONT WARMER

P1 WHI

WHI

J1-5

WHI/BLU

WHI/RED

(SEE TABLE BELOW FOR USAGE)

P1, P2, &

YEL

P3 ARE

WHI/VIO

REAR WARMER

VIO

PINS OF A

VIO

POLARIZED

WHI/GRN

J1-10

THREE-PIN

CONTROL PANEL ASSY

WARMER ASSY "B"

CONNECTOR.

J2-1

BREW SW

LT FRNT SW

LT REAR SW

YEL

FRONT WARMER

WHI

ON/OFF SW

TOP FRNT SW

TOP REAR SW

(SEE TABLE BELOW FOR USAGE) W

REAR WARMER

J2-6

WHI/VIO

HIDDEN SW

RT REAR SW

RT FRNT SW

WARMER WIRING REFERENCE

(ALL CONFIGURATIONS INCLUDE BREW STATION WARMER)

J2-11	STATIC	(NOTE – ALL WARMERS ARE NOT
	SHIELD	AVAILABLE ON ALL MODELS!)

J3-1	PNK
J3-1	GRN
	GRN
	WHI	LEVEL
J3-4	BLK	LEVEL
J3-4		PROBE
		PROBE
J5-1	BLK
J5-1
		t°

	LEFT	TOP	RIGHT
WITH TOP WARMERS	–	"A"	–
WITH LEFT WARMERS	"B"	–	–
WITH RIGHT WARMERS	–	–	"A"
WITH LEFT & RIGHT WARMERS	"B"	–	"A"
WITH LEFT & TOP WARMERS	"B"	"A"	–
WITH RIGHT & TOP WARMERS	–	"A"	"B"

200V AC

2 WIRE

SINGLE PHASE

Page 34	35582 021604

L1	SCHEMATIC WIRING DIAGRAM
	L2

CDBCP DB/CDBCFP DB

MAIN POWER

GRN

SWITCH

LIMIT

THERMOSTAT

TANK HEATER

WHI-14

BLK-14

BLU-14

BLK-14

WHI

"KEEP WARM" HEATER

WHI

BREW STATION WARMER

BLK

WHI/RED

(CONTROLLED BY ON/OFF SW)

WHI

COUNTER

WHI

REFILL

(OPTIONAL)

J1-1

BLK

WHI/BLU

SOL

WHI

BLK

DISPENSE

J1-2

COM

BLU-14

WHI/GRN

SOL

WHI

N.O.

BLK-14

WHI

J1-1

WARMER ASSY "A"

BLK

BRN/BLK

FRONT WARMER

P1 WHI

WHI

J1-5

WHI/BLU

WHI/RED

(SEE TABLE BELOW FOR USAGE)

P1, P2, &

YEL

P3 ARE

WHI/VIO

REAR WARMER

VIO

PINS OF A

VIO

POLARIZED

WHI/GRN

J1-10

THREE-PIN

CONTROL PANEL ASSY

WARMER ASSY "B"

CONNECTOR.

J2-1

BREW SW

LT FRNT SW

LT REAR SW

YEL

FRONT WARMER

WHI

ON/OFF SW

TOP FRNT SW

TOP REAR SW

(SEE TABLE BELOW FOR USAGE) W

REAR WARMER

J2-6

WHI/VIO

HIDDEN SW

RT REAR SW

RT FRNT SW

WARMER WIRING REFERENCE

(ALL CONFIGURATIONS INCLUDE BREW STATION WARMER)

J2-11	STATIC	(NOTE – ALL WARMERS ARE NOT
	SHIELD	AVAILABLE ON ALL MODELS!)

J3-1	PNK
J3-1	GRN
	GRN
	WHI	LEVEL
J3-4	BLK	LEVEL
J3-4		PROBE
		PROBE
J5-1	BLK
J5-1
		t°

	LEFT	TOP	RIGHT
WITH TOP WARMERS	–	"A"	–
WITH LEFT WARMERS	"B"	–	–
WITH RIGHT WARMERS	–	–	"A"
WITH LEFT & RIGHT WARMERS	"B"	–	"A"
WITH LEFT & TOP WARMERS	"B"	"A"	–
WITH RIGHT & TOP WARMERS	–	"A"	"B"

100V AC

2 WIRE

SINGLE PHASE

Page 35	35582 021604