Bunn CDBC Operating & Service Manual
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Bunn CDBC Operating & Service Manual

Bunn cdbc: user guide
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BUNN
®
CEZ, CEZF
CDBC, CDBCF
CDBCP, CDBCFP
S/N prior to CDBC020213
N
IO
U T
C A
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601
FAX: (217) 529-6644
www.bunnomatic.com
29079.0000H
04/03 ©1998 Bunn-O-Matic Corporation

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  • Page 1 BUNN ® CEZ, CEZF CDBC, CDBCF CDBCP, CDBCFP S/N prior to CDBC020213 OPERATING & SERVICE MANUAL BUNN-O-MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD, ILLINOIS 62708-3227 PHONE: (217) 529-6601 FAX: (217) 529-6644 www.bunnomatic.com 29079.0000H 04/03 ©1998 Bunn-O-Matic Corporation...

  • Page 2: Table Of Contents

    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 3: User Notices

    ° HEATED WHEN EMPTY ° USED ON HIGH FLAME FUNNEL CONTENTS OR EXPOSED ELECTRIC ELEMENTS ARE HOT 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...

  • Page 4: Electrical & Plumbing Requirements

    " 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.

  • Page 5: Operating Controls

    Placing any additional warmer switch in the "ON" upper position supplies power to the associated warmer. READY INDICATOR This indicator glows when the preselected brew water temperature has been achieved. Model CDBC OPERATING CONTROLS 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.

  • Page 6: Ready Indicator

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

  • Page 7: Pour-Over Feature

    When brewing is completed, simply discard the grounds and filter. 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. Check and clean the sprayhead. The sprayhead holes must always remain open.

  • Page 8: Cez Adjustments & Optional Settings

    CEZ ADJUSTMENTS & OPTIONAL SETTINGS READY TEMPERATURE TEMPERATURE 205° 205° (200°) (200°) (195°) (190°) (195°) (185°) (190°) (185°) IMPORTANT: The tank must be full and fill solenoid shut off prior to making these ad- justments. Adjusting Brew Volumes The brewer is factory set to deliver 64 ounces ±...

  • Page 9: Cdbc Adjustments & Optional Settings

    IMPORTANT: The tank must be full and fill solenoid shut off prior to making these adjust- ments. Adjusting Brew Volumes CDBC & CEZ models are factory set to deliver 64 ounces ± 2 for each brew cycle. HIDDEN SWITCH P1866...
  • Page 10 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.

  • Page 11: Troubleshooting

    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).
  • Page 12 Will not fill or refill PROBABLE CAUSE 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.
  • Page 13 (ON/OFF Switch "OFF") PROBABLE CAUSE 1. Lime build up on probe (all models) 2a. Water Level Probe Sensing System (CDBC) 2b. Water Level Probe Sensing System (CEZ) 3. Refill valve or control board (all models) 1. Refill valve or control board (all...
  • Page 14 "ON". Tank tempera- ture must be stabilized before read- ings are taken. PROBABLE CAUSE 1. Display flashing (CDBC) or ready light flashing (CEZ) 2. Water not touching tempera- ture probe 3a. Dry Plug In Probe Sensing System (CDBC) 3b.
  • Page 15 "ON". Tank tempera- ture must be stabilized before read- ings are taken. Spitting or excessive steaming PROBABLE CAUSE 4a. Temperature Probe (CDBC) 4b. Temperature Probe (CEZ) 5. Limit Thermostat (all models) 6. Tank Heater (all models) 1. Lime build up on temperature...
  • Page 16 HEATING CIRCUIT (cont.) PROBLEM Spitting or excessive steaming (cont.) Brewer is making unusual noises PROBABLE CAUSE 2a. Temperature Probe (CDBC) 2b. Temperature Probe (CEZ) 3. Control Board (all models) 1. Plumbing lines 2. Water supply 3. Lime build up Page 16...
  • Page 17 TROUBLESHOOTING (cont.) BREWING CIRCUIT PROBLEM Brew cycle will not start PROBABLE CAUSE 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"...
  • Page 18 3. Dispense Valve Page 18 REMEDY If the start switch (CEZ) or switch 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.
  • Page 19 ® 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 20 There should be six sepa- rate 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 gen- tly.
  • Page 21 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...

  • Page 22: Service

    Each warmer assembly is attached with three #4- 40 screws. Contents Control Board - CDBC ... 21 Control Board - CEZ ... 22 Switch Panel - CDBC ... 23 ON/OFF Switches - CEZ ... 24 BREW Switch (Start) - CEZ ... 25 Dispense Valve ...

  • Page 23: Control Board - Cdbc

    7. Connect the 10-pin connector and the 4-pin con- nector from the main wiring harness. 8. Connect the blue wire and black wire to the relay on the control board. 9. Refer to CDBC Adjustments and Optional Settings to program the new control board. Page 23 29079 042803...
  • Page 24 SERVICE (cont.) CONTROL BOARD - Model CEZ /L O FIG. 3 CONTROL BOARD - CEZ 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.

  • Page 25: Switch Panel - Cdbc

    SERVICE (cont.) SWITCH PANEL - Model CDBC FIG. 4 SWITCH PANEL - CDBC 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.
  • Page 26 SERVICE (cont.) ON/OFF SWITCHES - Model CEZ FIG. 5 ON/OFF SWITCHES Location: The ON/OFF switches are located on the front of the hood. 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.
  • Page 27 SERVICE (cont.) BREW SWITCH (Start) - Model CEZ FIG. 7 BREW SWITCH Location: The BREW switch is located in the center front of the hood. Test Procedure: 1. Disconnect the brewer from the power source. 2. Disconnect the white/yellow wire from the top switch terminal and the white/orange from the bottom switch terminal.

  • Page 28: Dispense Valve

    SERVICE (cont.) DISPENSE VALVE FIG. 9 DISPENSE VALVE Location: The dispense valve is located inside the top cover behind the front end cap. Test Procedures: 1. Disconnect the brewer from the power source. 2. Check the water level in the tank to confirm that it is within 1/2"...

  • Page 29: Limit Thermostat

    SERVICE (cont.) LIMIT THERMOSTAT FIG. 11 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.

  • Page 30: Tank Heater

    SERVICE (cont.) TANK HEATER 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.
  • Page 31 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.

  • Page 32: Refill Valve

    SERVICE (cont.) REFILL VALVE FIG. 15 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.

  • Page 33: Warmer Elements

    SERVICE (cont.) WARMER ELEMENT(S) 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.
  • Page 34 SCHEMATIC WIRING DIAGRAM CDBC - 15, 20 & 35 LIMIT THERMOSTAT BLK-14 BLU-14 COUNTER (OPTIONAL) J1-1 J1-2 BLU-14 BLK-14 N.O. J1-1 BRN/BLK WHI/BLU J1-5 WHI/RED WHI/VIO WHI/GRN J1-10 CONTROL PANEL ASSY BREW SW LT FRNT SW J2-1 ON/OFF SW TOP FRNT SW...
  • Page 35 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 TANK HEATER BLK-14 "KEEP WARM" HEATER REFILL WHI/BLU DISPENSE WHI/GRN...
  • Page 36 WITH LEFT WARMERS WITH RIGHT WARMERS WITH LEFT & RIGHT WARMERS WITH LEFT & TOP WARMERS t° WITH RIGHT & TOP WARMERS 29077.0002B 04/03 ©2002 BUNN-O-MATIC CORPORATION Page 36 WHI-14 (MODELS 15 & 20) TANK HEATER RED-14 (MODEL 35) BREW STATION WARMER...

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