Bunn BrewWise DBC Service Manual
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Bunn BrewWise DBC Service Manual

Bunn BrewWise DBC Service Manual

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BrewWISE
®
DBC
BREWERS
®
WITH SMART FUNNEL
®
SERVICE & REPAIR MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
41746.0000D 04/10 ©2008 Bunn-O-Matic Corporation

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  • Page 1 BrewWISE ® BREWERS ® WITH SMART FUNNEL ® SERVICE & REPAIR MANUAL BUNN-O-MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD, ILLINOIS 62708-3227 PHONE: (217) 529-6601 FAX: (217) 529-6644 41746.0000D 04/10 ©2008 Bunn-O-Matic Corporation...

  • Page 2: Warranty

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

  • Page 3: Table Of Contents

    TABLE OF CONTENTS Warranty .............................2 Table of Contents ........................3 Troubleshooting ..........................4 Service Tools ..........................15 Component Access ........................19 Control Board ........................19 Membrane Switch ........................20 Dispense and Bypass Valves....................21 Refill Valves .........................22 Tank Heaters ........................24 Temperature Probe ......................25 Limit Thermostats .......................25 Warmer Elements ........................26 Master Power Switch ......................26 SH Server Timer ........................27 Schematic (Wiring Diagram) .....................28...

  • Page 4: Troubleshooting

    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.
  • Page 5 TROUBLESHOOTING (cont.) Screen Displayed Possible Cause Troubleshooting Procedures 1. SMART FUNNEL not fully inserted Position the funnel so that the sensor NO FUNNEL into the funnel rails. is directly beneath the sensor coil on PRESENT the brewer. 2. Not using a SMART FUNNEL, Disable the FUNNEL DETECT func- and the FUNNEL DETECT function tion.
  • Page 6 TROUBLESHOOTING (cont.) Screen Displayed Possible Cause Troubleshooting Procedures 1. Soft Heat Server was moved out To resume brewing, correctly BREW STOPPED! of position after the brew cycle was position the Soft Heat Server and SERVER REMOVED? press BREW again. The brew cycle started.
  • Page 7 TROUBLESHOOTING (cont.) Possible Cause Troubleshooting Procedures Screen Displayed Check water supply shut-off 1. Water shut off to brewer FILL TIME TOO LONG Service required. See REFILL 2. Inlet Solenoid Valve failure VALVE. Service required. See CONTROL 3. Control Board Failure CHECK WATER BOARD.
  • Page 8 TROUBLESHOOTING (cont.) Problem Possible Cause Troubleshooting Procedure 1. No power or incorrect voltage. Measure the voltage at the terminal Equipment will not operate. block and confirm that it matches the voltage specified on the brewer data plate within +/- 10%. 1.
  • Page 9 TROUBLESHOOTING (cont.) Problem Possible Cause Troubleshooting Procedure Check the sensitivity setting. Refer to 3. Refill Probe or Sensitivity Set- Automatic refill will not operate or ting Refill function. If the left three digit display shows FILL TIME TOO LONG number is less than the right number, (cont.) the machine “thinks”...
  • Page 10 TROUBLESHOOTING (cont.) Power Troubleshooting Procedures Possible Cause Water flows into tank continuously 1. Refill Probe or Sensitivity Set- Check the sensitivity setting. Refer to with power applied to brewer. ting Refill function. If the left three digit number is less than the right number, the machine “thinks”...
  • Page 11 TROUBLESHOOTING (cont.) Troubleshooting Procedures Problem Possible Cause Water will not heat or display shows 3. Triac Remove power from the brewer. HEATING TIME TOO LONG (cont.) Connect a voltmeter across one of the tank heaters. Reapply power to the brewer and refer to Testing Individual Components.
  • Page 12 TROUBLESHOOTING (cont.) Troubleshooting Procedures Problem Possible Cause Perform the previous procedure 3. Electronic control board Spitting or unusual steaming from for testing triacs. If the voltage sprayhead or air vents. (Water too measured is very low or zero, then hot) (cont.) substitute a control board known to be in good working order.
  • Page 13 Dripping from sprayhead. 1. Brew Valve Repair or replace leaky valve. Water overflows filter. BUNN paper filters should be used 1. Type of paper filters for proper extraction. 2. No sprayhead Check sprayhead Beverage overflows server.
  • Page 14 Troubleshooting Procedures 6. Incorrect Recipe Consider adjusting bypass percent- Weak beverage (cont.) age, preinfusion, or pulse brew. Contact Bunn-O-Matic for sugges- tions. 1. Solenoid (Inlet) The nut on back of the solenoid Brewer is making unusual noises. must be tight or it will vibrate during operation 2.

  • Page 15: Service Tools

    TROUBLESHOOTING (cont.) SERVICE TOOLS 6. Press and release YES. The display should read: This function allows the testing of individual com- BREW VALVE on SINGLE brewers ponents and the ability to check switches for proper LEFT BREW VALVE on DUAL brewers. function.
  • Page 16 TROUBLESHOOTING (cont.) SERVICE TOOLS (cont.) SERVICE TOOLS? EXIT TO NEXT FUNCTION SCREEN TEST OUTPUTS? SINGLE DUAL BREWERS BREWERS TEST SWITCHES? PRESS AND RELEASE ® SYMBO L BREW VALVE LEFT BREW VALVE NEXT NEXT NOTHING PRESSED BYPASS LEFT BYPASS NEXT NEXT SINGLE TEST SERVERS? BREWERS...
  • Page 17 TROUBLESHOOTING (cont.) SERVICE TOOLS (cont.) to TEST SWITCHES?. Press and release switch NOTE: The tank heater will automatically turn off if again to advance to TEST SERVERS?. Another left on too long. alternative is to press and release the ON/OFF switch (either on DUAL brewers) located on the 26.
  • Page 18 TROUBLESHOOTING (cont.) SERVICE TOOLS (cont.) 3. Press and hold the upper right hidden switch until the display reads UNITS. Release the switch. Continue pressing and releasing the upper right hidden switch until SERVICE TOOLS appears. 4. Pressing NO will exit this function and advance to the next function screen.

  • Page 19: Component Access

    COMPONENT ACCESS This section provides procedures for testing and replacing various major components used in this If no voltage is present, check wiring to the board. brewer should service become necessary. Refer to If voltage is present, and brewer does not power on, Troubleshooting for assistance in determining the replace board.

  • Page 20: Membrane Switch

    COMPONENT ACCESS (cont) MEMBRANE SWITCH 4. Remove any adhesive that remains on the hood. 5. Remove the adhesive backing from the new mem- brane switch. Insert the ribbon cable through the slot in the hood and apply the membrane switch to the front of the hood.

  • Page 21: Dispense And Bypass Valves

    COMPONENT ACCESS (cont) If the polarity of meter leads are reversed, reading DISPENSE & BYPASS VALVES will indicate -170VDC. (Double these readings for 240 volt coils) If voltage is present as described, but no coil action is observed, valve is defective. Replace valve and test again to verify repair.

  • Page 22: Refill Valves

    COMPONENT ACCESS (cont) REFILL VALVE FIG 6 REFILL VALVE FIG 4 REFILL VALVE (DUAL TF DBC Early Models) (DUAL SH DBC Models) FIG 5 REFILL VALVE FIG 7 REFILL VALVE (SINGLE SH DBC Models) (DUAL TF DBC Late Models) Page 22 41746 112008...
  • Page 23 COMPONENT ACCESS (cont) REFILL VALVE (cont) If voltage is not present, refer to Wiring Diagrams and check main wiring harness. If harness checks ok, replace control board. 4. Check the refill valve for coil action. Briefly activate the refill valve in the test mode and listen carefully near the refill valve for a"clicking"...

  • Page 24: Tank Heaters

    COMPONENT ACCESS (cont) TANK HEATERS Location: Tank Heaters The tank heaters (Fig 9) are located inside the tank, secured to the tank lid. Test Procedures: 1. With a voltmeter, check voltage across the white wire (120V Models) or red wire (120/208 and 120/240V Models) and blue wire on the top of the tank heaters.

  • Page 25: Temperature Probe

    COMPONENT ACCESS (cont) TEMPERATURE PROBE Removal and Replacement: 1. Disconnect the brewer from the power source. 2. Refer to instructions included in Temperature Probe Kit #29327.0000 to replace Temperature Probe. LIMIT THERMOSTAT Temperature Probe Limit Thermostats FIG 10 TEMPERATURE PROBE Location: The temperature probe (Fig 10) is inserted into a grommet in the tank lid assembly.

  • Page 26: Warmer Elements

    COMPONENT ACCESS (cont) WARMER ELEMENTS (GPR MODELS) 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.

  • Page 27: Sh Server Timer

    COMPONENT ACCESS (cont) MASTER POWER SWITCH (cont) If continuity is not present as described, replace the switch. Removal and Replacement: 1. Disconnect the brewer from the power source. 2. Disconnect the wires from the power switch. 3. Remove the switch mounting screws from the under the base.

  • Page 28: Schematic Wiring Diagram

    "Brewer" Center Hidden Button BLU/BLK – "Control" Right Hidden Button – RECTIFIER 120/208 OR 120/240 VOLT A.C. + GND SINGLE PHASE 32043.0000D 01/07 © 2000 BUNN-O-MATIC CORPORATION White Strip-Tac Plus Black Ink Finished Size: 7.0" x 8.5" ~78% Reduction Page 28 41746 112008...
  • Page 29 2 WIRE – Medium Batch RECTIFIER Small Batch SINGLE PHASE "Digital" Left Hidden Button "Brewer" Center Hidden Button 50HZ "Control" Right Hidden Button 32043.0001B 07/05 © 2002 BUNN-O-MATIC CORPORATION NOT A PURCHASED SCHEMATIC Page 29 FOR REFERENCE ONLY 41746 112008...
  • Page 30 2 WIRE – Medium Batch RECTIFIER Small Batch SINGLE PHASE "Digital" Left Hidden Button "Brewer" Center Hidden Button 50/60HZ "Control" Right Hidden Button 32043.0002B 07/05 © 2004 BUNN-O-MATIC CORPORATION NOT A PURCHASED SCHEMATIC Page 30 41746 112008 FOR REFERENCE ONLY...
  • Page 31 120 VOLT A.C. "Brewer" Center Hidden Button – "Control" Right Hidden Button RECTIFIER 2 - WIRE SINGLE PHASE 32043.0004B 07/05 © 2004 BUNN-O-MATIC CORPORATION White Strip-Tac Plus Black Ink Finished Size: 5" x 6" ~55% Reduction Page 31 41746 112008...
  • Page 32 "Brewer" Center Hidden Button – 120/240 VOLT A.C. "Control" Right Hidden Button RECTIFIER 3 WIRE + GND SINGLE PHASE 32043.0005B 02/07 ©2006 BUNN-O-MATIC CORPORATION White Strip-Tac Plus Black Ink Finished Size: 7" x 9" ~75% Reduction Page 32 41746 112008...
  • Page 33 2 WIRE + GND Small Batch "Digital" Left Hidden Button SINGLE PHASE "Brewer" Center Hidden Button "Control" Right Hidden Button 50/60HZ 32043.0006C 06/07 © 2007 BUNN-O-MATIC CORPORATION White Strip-Tac Plus Black Ink Page 33 41746 112008 Finished Size: 7" x 9" ~75% Reduction...
  • Page 34 MODELS WITH MAIN ON/OFF SWITCH ONLY BLK-14 BLK-14 BLK-14 RED-14 RED-14 RED-14 RED-14 RED-14 120/208 OR 120/240 VOLT A.C. + GND SINGLE PHASE 29876.0000D 01/07 © 2001 BUNN-O-MATIC CORPORATION White Strip-Tac Plus Black Ink Finished Size: 8.5" x 11.0" Page 34 ~77% Reduction 41746 112008...
  • Page 35 Left Small Batch LED Left On/Off LED Right On/Off LED 230 VOLTS AC Right Large Batch LED 2 WIRE Right Medium Batch LED Right Small Batch LED SINGLE PHASE 50HZ 29876.0001A 08/02 © 2002 BUNN-O-MATIC CORPORATION Page 35 41746 112008 White Strip-Tac Plus...
  • Page 36 Left Large Batch LED Left Medium Batch LED Left Small Batch LED Left On/Off LED Right On/Off LED Right Large Batch LED Right Medium Batch LED Right Small Batch LED 29876.0003A 06/04 © 2004 BUNN-O-MATIC CORPORATION Page 36 41746 112008...
  • Page 37 Medium Batch SINGLE PHASE Small Batch "Digital" Left Hidden Button "Brewer" Center Hidden Button "Control" Right Hidden Button 32043.0003C 01/07 © 2004 BUNN-O-MATIC CORPORATION White Strip-Tac Plus Black Ink Finished Size: 7.25" x 8.50" ~80% Reduction Page 37 41746 112008...
  • Page 38 J2-5 TEMP PROBE J2-10 J11-18 L. FUNNEL LOCK R. FUNNEL LOCK OPTIONAL RT WARMER WHI/RED LT WARMER WHI/VIO 120/208 OR 120/240 VOLT A.C. + GND SINGLE PHASE 29876.0004B 01/07 © 2004 BUNN-O-MATIC CORPORATION Page 38 41746 112008 White Strip-Tac Plus...
  • Page 39 LED's 3 WIRE + GND Large Batch LED SINGLE PHASE Medium Batch LED Small Batch LED On/Off LED 35726.0000B 02/07 © 2003 Bunn-O-Matic Corporation White Strip-Tac Plus Black Ink Finished Size: 8.0" x 9.5" ~78% Reduction Page 39 41746 112008...
  • Page 40 LED's 230 OR 200 Large Batch LED VOLT A.C. Medium Batch LED Small Batch LED SINGLE PHASE 36883.0000A 05/04 © 2004 Bunn-O-Matic Corporation On/Off LED White Strip-Tac Plus Black Ink Finished Size: 6.0" x 6.9" 60% Reduction Page 40 41746 112008...
  • Page 41 LED's 120 VOLT A.C. Large Batch LED 2 WIRE SINGLE PHASE Medium Batch LED Small Batch LED 60HZ 36883.0002A 11/04 © 2004 Bunn-O-Matic Corporation On/Off LED White Strip-Tac Plus Black Ink Finished Size: 6.0" x 6.9" ?60% Reduction Page 41...
  • Page 42 200,208 or 240 VOLT A.C. Large Batch LED 2 WIRE + GND Medium Batch LED Small Batch LED SINGLE PHASE 50/60HZ 36883.0001B 02/07 © 2004 Bunn-O-Matic Corporation On/Off LED White Strip-Tac Plus Black Ink Finished Size: 7.5" x 9.25" ~75% Reduction...
  • Page 43 PHASE TO PHASE, Large Batch "Control" Right Hidden Button 230 VOLTS AC LED's PHASE TO NEUTRAL Large Batch LED Medium Batch LED 3 PHASE 50/60 HZ Small Batch LED 36883.0003A 02/07 © 2007 Bunn-O-Matic Corporation On/Off LED Page 43 41746 112008...
  • Page 44 Left On/Off LED Right On/Off LED 3 WIRE + GND Right Large Batch LED SINGLE PHASE Right Medium Batch LED 34916.0000B 02/07 © 2002 Bunn-O-Matic Corporation Right Small Batch LED White Strip-Tac Plus Black Ink Finished Size: 8.0" x 9.5" ≈76% Reduction...
  • Page 45 Left Small Batch LED Left On/Off LED Right On/Off LED 120/208 OR 120/240 VOLT A.C. Right Large Batch LED 4 WIRE + GND 3-PHASE Right Medium Batch LED 34916.0001E 06/09 © 2002 Bunn-O-Matic Corporation Right Small Batch LED Page 45 41746 070209...
  • Page 46 200/230 VOLT A.C. Left On/Off LED Right On/Off LED 2 WIRE Right Large Batch LED SINGLE PHASE Right Medium Batch LED 34839.0000B 10/05 © 2003 Bunn-O-Matic Corporation Right Small Batch LED Page 46 41746 112008 White Strip-Tac Plus Black Ink...
  • Page 47 Left On/Off LED SINGLE PHASE Right On/Off LED Right Large Batch LED 50/60 HZ Right Medium Batch LED 34839.0002D 02/07 © 2004 Bunn-O-Matic Corporation Right Small Batch LED White Strip-Tac Plus Black Ink Finished Size: 8" x 10.0" ~78% Reduction...
  • Page 48 230 VOLTS AC Left Small Batch LED Left On/Off LED PHASE TO NEUTRAL Right On/Off LED 3 PHASE 50/60 HZ Right Large Batch LED Right Medium Batch LED 34839.0003C 09/06 © 2005 Bunn-O-Matic Corporation Right Small Batch LED Page 48 41746 112008...
  • Page 49 Right On/Off LED 120/208 OR 120/240 VOLT A.C. Right Large Batch LED 4 WIRE + GND 3-PHASE or 1-PHASE Right Medium Batch LED 34916.0003A 02/10 © 2010 Bunn-O-Matic Corporation Right Small Batch LED Page 49 41746 040410 White Strip-Tac Plus...
  • Page 50 Left On/Off LED Right On/Off LED 208 OR 240 VOLT A.C. Right Large Batch LED 3 WIRE + GND 3-PHASE or 1-PHASE Right Medium Batch LED 34916.0004B 03/10 © 2010 Bunn-O-Matic Corporation Right Small Batch LED Page 50 41746 040210...

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