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INTRODUCTION This equipment will brew one or two half-gallon batches of coffee simultaneously into awaiting dispensers with just the press of a button. One side may include a hot water faucet 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 .....................................
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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 U
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ELECTRICAL REQUIREMENTS CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up. L2 RED One circuit models require one 3-wire, grounded service rated 120/208 or 120/240 volts ac, 40 amp, single phase, 60 Hz. 120V.A.C. WHITE 208 or 240V.A.C. Two circuit models require two 3-wire, grounded service rated 120/208 NEUTRAL 120V.A.C. or 120/240 volts ac, 20 amp, single phase, 60 Hz. L1 BLACK Proceed as follows: Electrical Hook-Up CAUTION – Improper electrical i
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BREW SWITCH Momentarily pressing and releasing the switch starts a brew cycle when the "ON/OFF" indicator is glowing. NOTE – The "ON/OFF" indicator must be glowing to initiate and complete a brew cycle. ADDITIONAL WARMER SWITCHES Pressing any additional warmer switch so 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 IND
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CDBC ADJUSTMENTS & OPTIONAL SETTINGS HIDDEN HIDDEN SWITCH SWITCH P1871 NOTE: The following adjustments must be performed for each Brew Station. Setting Brew Temperature The brewer is factory set to brew at 200°F(95°C). To change this setting, press and hold the "HIDDEN" switch beneath the "®". The word "TEMP" above the "ON/OFF" switch will glow to correspond with the temporary function change of this switch. Repeatedly press and release the "ON/OFF" switch until one of the bank of temperature i
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Adjusting Brew Volumes The brewer is factory set to deliver 64 ounces ± 2 for each brew cycle. BREW VOLUME SET-UP: Use the following steps when the setting is unknown or a different circuit board is being installed. 1. Place an empty funnel in the funnel rails and an empty decanter or graduated vessel beneath the funnel. 2. Press the "ON/OFF" switch (indicator glowing). 3. Press and hold the brew start button until you hear the brew solenoid click on-and-off three times (approximately 10 seconds
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PULSE BREW SETUP PROCEDURE (CDBC TWIN & CDBCF TWIN) 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
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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 appl
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TROUBLESHOOTING (cont.) REFILL CIRCUIT PROBLEM PROBABLE CAUSE REMEDY Will not fill or refill 1. Power off to brewer (CDBC & Press warmer switches on control CEZ) panel to determine if power is ON. 2. Water shut off (CDBC & CEZ) Make sure water is ON. 3. Display flashing (CDBC) or Brewer has shut down due to mal- ready light flashing (CEZ) function (See Diagnostic Chart in manual, Page 20, or under top lid of brewer). 4. ON/OFF Switch (CDBC & CEZ) Make sure ON/OFF Switch is "ON" and indicator is
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TROUBLESHOOTING (cont.) REFILL CIRCUIT (cont.) PROBLEM PROBABLE CAUSE REMEDY 2a. Water Level Probe Sensing Sys- A) Disconnect the brewer from the tem (CDBC) 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 grom- met. Check for continuity from the outside surface of the temperature probe and pin 4 of the plug, conti-
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TROUBLESHOOTING (cont.) HEATING CIRCUIT PROBABLE CAUSE PROBLEM REMEDY Water does not heat to proper 1. Display flashing (CDBC) or Brewer has shut down due to temperature ready light flashing (CEZ) malfunction (See Diagnostic Chart in manual, Page 20, or IMPORTANT: Make sure no tem- under top lid). perature tests are taken before the ready light is "ON". Tank tempera- 2. Water not touching tempera- Remove probe and grommet. Look ture must be stabilized before read- ture probe into hole on tank li
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TROUBLESHOOTING (cont.) HEATING CIRCUIT PROBLEM PROBABLE CAUSE REMEDY Water does not heat to proper 4a. Temperature Probe (CDBC) A) Remove the probe from the temperature (cont.) grommet and submerge in a water bath of approximately 70°F(21°C). IMPORTANT: Make sure no tem- Connect an ohmmeter to pins 3 perature tests are taken before the and 4 of the J3 connector. At ready light is "ON". Tank tempera- 60°F(16°C) the reading should be ture must be stabilized before read- 15.3k ± 2k OHMS, at 70°F(2
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TROUBLESHOOTING (cont.) HEATING CIRCUIT PROBLEM PROBABLE CAUSE REMEDY Spitting or excessive steaming 2a. Temperature Probe (CDBC) A) Remove the probe from the (cont.) 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 read- ing should be 9.3k ± 2k OHMS. If the probe is within these param- eters, rec
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TROUBLESHOOTING (cont.) BREWING CIRCUIT PROBLEM PROBABLE CAUSE REMEDY Brew cycle will not start 1. Display flashing (CDBC) or Brewer has shut down due to mal- ready light flashing (CEZ) function (See Diagnostic Chart in manual, Page 20, or under top lid of brewer). 2. No water Water lines and valves to the brewer must be open. 3. No power or incorrect voltage to Check for voltage across the black the brewer and white terminals at the termi- nal block. 4. ON/OFF switch not in the "ON" The indicat
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TROUBLESHOOTING (cont.) BREWING CIRCUIT (cont.) PROBABLE CAUSE REMEDY PROBLEM Brew cycle will not start (cont.) 8. Control board or dispense valve If the start switch (CEZ) or switch (CDBC & CEZ) panel (CDBC) is operating prop- erly, proceed as follows. Attach a voltmeter to the terminals of the dispense solenoid. Connect the brewer to the power source. Turn on the brewer and press the BREW switch. Voltage should be present at the solenoid terminals. If volt- age is not present, refer to the wir
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TROUBLESHOOTING (cont.) BREWING CIRCUIT (cont.) PROBABLE CAUSE REMEDY PROBLEM Dripping from sprayhead 1. Lime build up Inspect the tank assembly for ex- cessive lime deposits. Delime as required. 2. Dispense valve Remove the dispense valve and clear any obstructions. Rebuild or replace the valve if necessary.(See page 27) Weak beverage 1. Sprayhead A six-hole stainless steel spray- head must be used for proper ex- traction. 2. Water temperature Place an empty brew funnel on an empty decanter ben
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TROUBLESHOOTING (cont.) BREWING CIRCUIT (cont.) PROBABLE CAUSE REMEDY PROBLEM Dry coffee grounds remain in the 1. Sprayhead Make sure sprayhead is present funnel and holes are clear and unob- structed. There should be six sepa- rate streams of water coming out of the sprayhead. ® 2. Funnel loading paper filter must be The BUNN 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
