CDBC-MV, CDBCF-MV CDBC-MV, CDBCF APS-MV CDBC-DV, CDBCF-DV CDBC APS-DV CDBCF APS-DV (DV Models prior to Serial #CDBC024477) DISCONTINUED VERSION The information in this manual is no longer current. N C A U T IO N : N U B OPERATING & SERVICE MANUAL BUNN-O-MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD, ILLINOIS 62708-3227 PHONE: (217) 529-6601 FAX: (217) 529-6644 29707.0000H 10/03 ©1999 Bunn-O-Matic Corporation www.bunnomatic.
INTRODUCTION This equipment will brew a half-gallon batch of coffee into an awaiting dispenser. It can be easily configured for 120V 15 amp, 120V 20 amp (MV models only), 120/208V 20 amp or 120/240V 20 amp. The brewer may have a hot water faucet for allied beverage use. It is only for indoor use on a sturdy counter or shelf. BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY Bunn-O-Matic Corp.
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. Optional Field Wiring 120 V, 17.0 A, 2050 W 1PH, 2-Wire, 60HZ or 120/208-240 V, 13.6-15.3 A, 2640-3430 W 1PH, 3-Wire, 60HZ #29710.0002 (MV models only) TWO WARMER BREWERS Optional Field Wiring #00658.0000 120 V, 18.0 A, 2150 W 1PH, 2-Wire, 60HZ or 120/208-240 V, 14.4-16.2 A, 2740-3530 W 1PH, 3-Wire, 60HZ #29710.
USER NOTICES (CONT.) Optional Field Wiring Optional Field Wiring 120 V, 15.0 A, 1800 W 1PH, 2-Wire, 60HZ 120/208-240 V, 15.6-17.5 A, 2980-3850 W 1PH, 3-Wire, 60HZ #29710.0005 (DV models only) CDBCF-DV BREWERS #29710.0007 (DV models only) NO WARMER BREWERS Optional Field Wiring Optional Field Wiring 120/208-240 V, 13.0-15.0 A, 2680-3550 W 1PH, 3-Wire, 60HZ 120 V, 16.2 A, 1950 W 1PH, 2-Wire, 60HZ or 120/208-240 V, 12.7-14.5 A, 2540-3330 W 1PH, 3-Wire, 60HZ #29710.
Models CDBC-DV, CDBC-APS DV & CDBCF LPTC-DV ELECTRICAL REQUIREMENTS CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up. Brewers with an attached cord set require 2-wire, grounded service rated 120 volts ac, 15 amp, single phase, 60 Hz. Requirements for brewers without an attached cord set are as follows: 1425W VERSION 3180W VERSION Requires 2-wire, grounded service rated 120 volts ac, 15 amp, single phase, 60 Hz.
Models CDBC-MV & CDBC-APS MV ELECTRICAL REQUIREMENTS CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up. TANK HEATER TERMINAL BLOCK WIRING DIAGRAM (CDBC-MV MODELS) 1425W @ 120V 1800W @ 120V 1800W 1800W 1425W B L K B L U BLK 1425W 1425W B L K W H T 2390W @ 120/208V or 3180W @ 120/240V 1800W B L U B L K W H T BLK WHI RED WHI RED BLK RED L2 RED L2 RED L2 RED WHITE WHITE WHITE NEUTRAL NEUTRAL NEUTRAL 120V A.C. L1 BLACK 120V A.C.
PLUMBING REQUIREMENTS These brewers must be connected to a cold water system with operating pressure between 20 and 90 psi (138 and 620 kPa) from a 1⁄2" or larger supply line. A shut-off valve should be installed in the line before the brewer. Install a regulator in the line when pressure is greater than 90 psi (620 kPa) to reduce it to 50 psi (345 kPa). The water inlet fitting is 1⁄4" flare.
OPERATING CONTROLS 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 de-energizes 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.
ADJUSTMENTS & OPTIONAL SETTINGS HIDDEN SWITCH P1866 Setting Brew Temperature The brewer is factory set to brew at 200°F (95°C). To change this setting, press and hold the "HIDDEN" switch beneath the "®". The word "TEMP" above the "ON/OFF" switch will glow to correspond with the temporary function change of this switch. Repeatedly press and release the "ON/OFF" switch until one of the bank of temperature indicators shows the approximate desired temperature.
ADJUSTMENTS & OPTIONAL SETTINGS (CONT.) 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.
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.
TROUBLESHOOTING (cont.) REFILL CIRCUIT PROBLEM PROBABLE CAUSE REMEDY Will not fill or refill 1. Power off to brewer Press warmer switches on control panel to determine if power is ON. 2. Water shut off Make sure water is ON. 3. Display flashing Brewer has shut down due to malfunction (See Diagnostic Chart in manual, Page 20, or under top lid of brewer). 4. ON/OFF Switch Make sure ON/OFF Switch is "ON" and indicator is lit. 5.
TROUBLESHOOTING (cont.) REFILL CIRCUIT (cont.) PROBLEM PROBABLE CAUSE REMEDY Fill or refill does not shut "OFF" (ON/ OFF Switch "ON") 1. Lime build up on probe Remove Level Probe and check for lime deposits on tip. Clean and reinstall. 2. Water Level Probe Sensing System 3. Refill valve or control board Fill or refill does not shut "OFF" (ON/ OFF Switch "OFF") 1. Refill valve or control board Page 13 Disconnect the brewer from the power source. Disconnect the J3 connector from the control board.
TROUBLESHOOTING (cont.) HEATING CIRCUIT PROBLEM PROBABLE CAUSE REMEDY Water does not heat to proper temperature 1. Display flashing Brewer has shut down due to malfunction (See Diagnostic Chart in manual, Page 20, or under top lid). 2. Water not touching temperature probe Remove temperature probe and grommet. Look into hole on tank lid. Water must be within one inch from top of tank. 3. Water Level Probe Sensing System Disconnect the brewer from the power source.
TROUBLESHOOTING (cont.) HEATING CIRCUIT (cont.) PROBLEM Water does not heat to proper temperature (cont.) PROBABLE CAUSE REMEDY 6. Tank Heater Disconnect the brewer from the power source. Check for continuity between the white terminal of the terminal block (or red terminal on 208/240volt models) and the black wire on the relay on the control board (Toggle Switch must be in 120/208-240V position on 208V & 240V models). There should be a low OHM reading.
TROUBLESHOOTING (cont.) HEATING CIRCUIT (cont.) PROBLEM PROBABLE CAUSE REMEDY Spitting or excessive steaming (cont.) 1. Lime build up on temperature probe, tank or tank heater Inspect probe and tank assembly for excessive lime deposits. Delime as required. 2. Temperature Probe 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.
TROUBLESHOOTING (cont.) BREWING CIRCUIT PROBLEM PROBABLE CAUSE REMEDY Brew cycle will not start 1. Display flashing Brewer has shut down due to malfunction (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 the brewer Check for voltage across the terminals at the terminal block. 4. ON/OFF switch not in the "ON" position The indicator lamp must be lit 5.
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. 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.
TROUBLESHOOTING (cont.) BREWING CIRCUIT (cont.) PROBLEM PROBABLE CAUSE REMEDY Dripping from sprayhead 1. Lime build up Inspect the tank assembly for excessive 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 24) 1. Sprayhead A six-hole stainless steel sprayhead must be used for proper extraction. 2. Water temperature Place an empty brew funnel on an empty decanter beneath the sprayhead.
TROUBLESHOOTING (cont.) BREWING CIRCUIT (cont.) PROBLEM Dry coffee grounds remain in the funnel Low beverage serving temperature PROBABLE CAUSE REMEDY 1. Sprayhead Make sure sprayhead is present and holes are clear and unobstructed. There should be six separate streams of water coming out of the sprayhead. 2. Funnel loading The BUNN® paper filter must be centered in the funnel and the bed of grounds leveled by shaking gently. 1. Warmer Disconnect the brewer from the power source.
DIAGNOSTICS Intermittent flashing of 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.
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.
SERVICE (cont.) C A U T IO N : W A R M E R S A N D S U R F A C E S A R E H O T 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 10.
SERVICE (cont.) SWITCH PANEL P1848 FIG. 3 SWITCH PANEL Location: The Switch Panel is located in the front of the hood. 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.
SERVICE (cont.) DISPENSE VALVE 6. Connect the voltmeter lead ends to the dispense valve coil terminals. Connect the brewer to the power source. Brewer temperature lockout must be disabled. Place "ON/OFF" Switch in the "ON" position. Press and release the brew switch. The indication must be 120 volts ac. 7. Disconnect the brewer from the power source.
SERVICE (cont.) LIMIT THERMOSTAT A C E S A R E H O T 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. C A U T IO N : W A R M E R S A N D S U R F BLU from Control Board P1854 FIG.
SERVICE (cont.) TANK HEATERS Location: The tank heaters are located inside the tank and secured to the tank bottom. DV models only Test Procedures : 1. Disconnect the brewer from the power source. 2. With a voltmeter, check voltage across the white wire from the terminal block and black wire from the control board. Connect brewer to the power source. The indication must be 120 volts ac. 3. Disconnect the brewer from the power source. 4.
SERVICE (cont.) TANK HEATERS (cont.) 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.
SERVICE (cont.) VOLTAGE SELECTOR SWITCH - DV models only 7. Disconnect the white/violet wire from the selector switch. With the selector switch in the 120/208240V position, check for continuity between the center terminal and the white/violet wire terminal. If continuity is present as described, the dual voltage selector switch is operating properly. If continuity is not present as described, replace the dual voltage selector switch.
SERVICE (cont.) If continuity is not present as described, replace the refill valve. 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.
SERVICE (cont.) WARMER ELEMENT(S) 4. 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. ! ER N IO CANT UT RD DE CA DISCA IF: P1859 FIG. 14 WARMER ELEMENTS Location: The warmer element(s) is located under the warmer plate. Removal and Replacement: 1. Remove the three #4-40 screws securing the warmer assembly to the brewer. 2.
SERVICE (cont.) FUSE HOLDER/FUSE ASSEMBLY MV models only Removal and Replacement: 1. Remove the cap from the holder. 2. Remove fuse from the fuse holder and discard. 3. Install new 20 amp fuse in the holder. 4. Reinstall fuse holder cap. J1 1 TRM 2 TRM J2 J3 J5 J4 J6 C A U T IO N : W A R M E R S A N D S U R F A C E S A R E H O T J7 P1937 FIG. 15 FUSE HOLDER AND FUSE ASSEMBLY Location: The fuse holder and fuse assembly is located on the left rear side of the brewer.
SERVICE (cont.) THERMAL FUSES MV models only J1 Removal and Replacement: 1. Disconnect the thermal fuse wiring harness from the right tank heater terminal tank heater terminal block or the thermal fuse from the left tank heater terminal and the tank heater terminal block. 2. Remove the wiring harness and discard. 3. Connect new wiring harness to right tank heater terminal tank heater terminal block or the left thermal fuse to the left tank heater terminal and the tank heater terminal block. 4.
SCHEMATIC WIRING DIAGRAM CDBC DV L1 N GRN LIMIT THERMOSTAT BLU-14 BLK-14 SELECTOR SWITCH BLK-14 TANK HEATER WHI-14 BLU-14 TANK HEATER WHI/VIO-14 1425W L2 RED-14 1800W "KEEP WARM" HEATER WHI WHI BREW STATION WARMER WHI/RED (CONTROLLED BY ON/OFF SW) BLK COUNTER (OPTIONAL) C O N T R O L BLK J1-1 BLK J1-2 BLU-14 COM BLK-14 N.O.
SCHEMATIC WIRING DIAGRAM CDBC APS-DV CDBCF APS/TC/LPTC-DV L1 N GRN LIMIT THERMOSTAT BLU-14 BLK-14 SELECTOR SWITCH BLK-14 TANK HEATER WHI-14 BLU-14 WHI/VIO-14 1425W L2 TANK HEATER RED-14 1800W "KEEP WARM" HEATER WHI WHI BLK COUNTER (OPTIONAL) C O N T R O L BLK J1-1 BLK J1-2 BLU-14 COM BLK-14 N.O.
SCHEMATIC WIRING DIAGRAM CDBC MV L1 N GRN TANK HEATER THERMAL FUSE 20 AMP TANK HEATER WHI-14 LIMIT THERMOSTAT BLU-14 BLK-14 "KEEP WARM" HEATER WHI BREW STATION WARMER WHI/RED (CONTROLLED BY ON/OFF SW) BLK COUNTER (OPTIONAL) J1-5 C B O A R D J1-10 WHI/BLU WHI/GRN WHI WHI SOL WHI WARMER ASSY "A" BRN/BLK VIO CONTROL PANEL ASSY LT FRNT SW LT REAR SW BREW SW ON/OFF SW HIDDEN SW P2 P3 YEL P2 TOP FRNT SW TOP REAR SW RT REAR SW BRN/BLK FRONT WARMER WHI P1 (SEE TABLE BELOW FOR USAGE) W H
SCHEMATIC WIRING DIAGRAM CDBC - APS MV L1 N L2 GRN BLK-14 20 AMP LIMIT THERMOSTAT BLU-14 BLK-14 THERMAL FUSE TANK HEATER THERMAL FUSE BLU-14 TANK HEATER WHI WHI-14 BLK-14 BLK COUNTER (OPTIONAL) C O N T R O L RED-14 WHI-14 BLK J1-1 BLK J1-2 BLU-14 COM BLK-14 N.O.
