Bunn FMD DBC-3 Operating & Service Manual
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Bunn FMD DBC-3 Operating & Service Manual

Bunn fmd dbc-3: user guide
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FMD DBC-3

FMDA DBC-3

SN FMD0013000-UP
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
www.bunn.com
29215.0000F 01/06 ©1998 Bunn-O-Matic Corporation

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  • Page 1: Fmda Dbc

    FMD DBC-3 FMDA DBC-3 SN FMD0013000-UP OPERATING & SERVICE MANUAL BUNN-O-MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD, ILLINOIS 62708-3227 PHONE: (217) 529-6601 FAX: (217) 529-6644 www.bunn.com 29215.0000F 01/06 ©1998 Bunn-O-Matic Corporation...
  • Page 2 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 00831.0000 CONTROL THERMOSTAT ADJUSTMENT 200 F APPROXIMATE THERMOSTAT TEMPERATURE SETTINGS 28368.0001A 8/98 © 1998 BUNN-O-MATIC CORPORATION 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).

  • Page 4: Initial Setup

    Bunn-O-Matic does not recommend the use of a saddle valve to install the dispenser. The size and shape of the hole made in the supply line by this type of device may restrict water flow.

  • Page 5: Initial Fill & Heat

    INITIAL FILL & HEAT CAUTION - The dispenser must be disconnected from the power source throughout the initial fill & heat, except when specified in the instructions. 1. Turn on the water supply and connect the dispenser to the power source. 2.

  • Page 6: Dispenser Use

    DISPENSER USE 1. Simply place a cup on the drip tray beneath the desired dispensing tip. 2. a) Momentarily press the appropriate dispense switch to froth and dispense the beverage. The dispenser will automatically dispense the beverage for the programmed dispense time at the programmed hopper dispense rate.
  • Page 7 d. To return the dispense rate to the factory preset, press and hold down stop switch and press the medium switch. When the medium switch is pressed, the L.E.D. on that position will flash on and off to indicate the switch was recognized.

  • Page 8: Draining The Hot Water Tank

    Refer to the decal inside the hopper access door for cleaning recommendations and procedures. 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. ADJUSTMENTS The hot or cold beverage solenoids are preset to dispense approximately be adjusted: 1.

  • Page 9: 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 10 TROUBLESHOOTING (cont.) PROBLEM Product will not dispense (cont.) Water is not hot PROBABLE CAUSE 4. Dispense Solenoid Valve (Hot or Cold) 5. Solenoid Valve (Inlet) 6. Control Board 7. Overflow Protection Switch 8. Auger Drive 9. Water Strainer 10. Lime build-up CAUTION - Tank and tank compo- nents should be delimed regularly depending on local water condi-...
  • Page 11 TROUBLESHOOTING (cont.) PROBLEM Water is not hot (cont.) Spitting or excessive steaming Dripping from dispense tip Water flows into tank continuously PROBABLE CAUSE 2. Control Thermostat 3. Tank Heater 4. Tank Heater Switch 1. Lime build-up CAUTION - Tank and tank compo- nents should be delimed regularly depending on local water condi- tions.
  • Page 12 TROUBLESHOOTING (cont.) PROBLEM Water flows into tank continuously (cont.) Product overflows container Weak product PROBABLE CAUSE 3. Overflow Protection Switch 1. Digital Touch Control Switch 2. Dispense Solenoid Valve (Hot or Cold) 3. Dispense time excessive 1. Water temperature 2. Whipper Motor 3.
  • Page 13 TROUBLESHOOTING (cont.) PROBLEM Weak product (cont.) Dispenser is making unusual noises Excess dust Display not lit PROBABLE CAUSE 7. Auger Motor 8. Rinse/Run Switch 9. Rinse Timer 1. Plumbing Lines 2. Water Supply 3. Tank Heater 1. Fan 2. Control Board 1.
  • Page 14 TROUBLESHOOTING (cont.) PROBLEM Hot water will not dispense Ready lamp will not light Ready lamp lights constantly PROBABLE CAUSE 1. Dispense solenoid valve 2. Digital touch control switch 3. Auxiliary control board 1. Tank heater switch 2. Control thermostat 3. Digital touch control switch 4.

  • Page 15: Table Of Contents

    SERVICE This section provides procedures for testing and replacing various major components used in this dispenser should service become necessary. Refer to Troubleshooting for assistance in determining the cause of any problem. WARNING - Inspection, testing, and repair of electri- cal equipment should be performed only by qualified service personnel.
  • Page 16 SERVICE AUGER DRIVE COMPONENTS (CONT.) 4. Disconnect the dispenser from the power supply. If voltage is present as described and the auger mo- tor does not rotate, replace the auger motor. If voltage is not present as described, refer to the wir- ing diagrams and check the dispenser wiring harness.
  • Page 17 SERVICE AUGER DRIVE COMPONENTS (CONT.) Removal, Cleaning and Replacement: Hopper & Auger (Late Models): 1. Open the dispenser door and raise the top front cover. 2. Lift the front edge of hopper assy (17) over the tab on hopper support plate (16) and slide hop- per assembly out the front of the dispenser.

  • Page 18: Auger Motor

    SERVICE (cont.) AUGER DRIVE COMPONENTS (cont.) Auger Drive Motor (Refer to Figs. 2 & 3) 1. Remove all hopper assemblies (20) and set aside for reassembly. 2. Remove the four #8-32 screws securing the hop- per support plate (19), and hopper locator bracket (21) remove plate and bracket and set aside for reassembly.

  • Page 19: Auxiliary Control Board

    SERVICE (cont.) AUXILIARY CONTROL BOARD FIG. 5 AUXILIARY CONTROL BOARD Location: The auxiliary control board is located behind the lower front access cover, mounted on the rear side of the component bracket. Hot Water Dispense Test Procedure: 1. Disconnect the dispenser from the power source. 2.
  • Page 20 SERVICE (cont.) AUXILIARY CONTROL BOARD (cont.) 5. On the dispenser whipper panel, ensure that the tank heater switch is in the “ON” (lower) position. 6. Disconnect the black wire coming from the control thermostat from the limit thermostat. 7. Remove the control thermostat bulb from the tank. 8.

  • Page 21: Ballast

    SERVICE (cont.) BALLAST FIG. 7 BALLAST Location The front door lamp ballast is located behind the front access panel on the left side of the compo- nent bracket. Test Procedure 1. Disconnect the dispenser from the power source. 2. Disconnect the two black leads on the ballast from the dispenser main harness.

  • Page 22: Control Board

    SERVICE (cont.) CONTROL BOARD FIG. 9 CONTROL BOARD Location: The Control Board is located behind the lower front access cover mounted on the component bracket. Test Procedure: Liquid Level Control Circuitry: 1. Disconnect the dispenser from the power source. 2. Disconnect the eight pin connector from J1 of the control board.
  • Page 23 SERVICE (cont.) CONTROL BOARD (cont.) If voltage is present as described, proceed to step 16. If the voltage is not present as described, replace the control circuit board. 16. Reconnect the eight pin connector of the wiring harness to J1 of the control board. 17.

  • Page 24: Control Thermostat

    SERVICE (cont.) CONTROL BOARD (cont.) 9. Disconnect the dispenser from the power source. 10. With a voltmeter check the voltage across the terminals of the appropriate dispense solenoid. Connect the dispenser to the power source. Press the appropriate dispense switch. The indication must be : a) 120 volts ac for two wire 120 volt models b) 120 volts ac for three wire 120/208 or 120/240...
  • Page 25 SERVICE (cont.) CONTROL THERMOSTAT (cont.) Electronic Thermostat (Optional) 1. Disconnect the dispenser from the power source. 2. Disconnect the black wire of the control thermo- stat from the black wire from the limit thermostat. 3. Remove temperature probe from the tank. 4.

  • Page 26: Digital Touch Control Switch

    SERVICE (cont.) DIGITAL TOUCH CONTROL SWITCH FIG.13 DIGITAL TOUCH CONTROL SWITCH Location: The digital touch control switch is located on the lower outside of the dispenser door. Test Procedure: 1. Disconnect the dispenser from the power source. 2. Open dispenser door and remove the bottom door cover.
  • Page 27 SERVICE (cont.) DIGITAL TOUCH CONTROL SWITCH (cont.) Removal and Replacement: 1. Open the dispenser door. 2. Remove the five #6-32 screws securing the bot- tom door cover and remove cover. 3. Disconnect the wires on the dispense switch to be removed from the door interconnect wiring harness.

  • Page 28: Fan

    SERVICE (cont.) FIG. 15 FAN Location: The fan is located inside the dispenser hous- ing on the right rear of the dispenser base plate. Test Procedures: 1. Disconnect the dispenser from the power source. 2. Disconnect the black and white wires from the fan terminals.
  • Page 29 SERVICE (cont.) FROTHER AND WHIPPER MOTOR (cont.) 4. Press and hold the appropriate dispense switch and check the voltage across the disconnected harness wires with a voltmeter. Connect the dispenser to the power source. The reading must a) 120 volts ac for two wire 120 volt models. b) 120 volts ac for three wire 120/208 or 120/240 volt models.

  • Page 30: Hot/Cold Switch

    SERVICE (cont.) FROTHER AND WHIPPER MOTOR (cont.) 20. Slide whipper chamber receptacle w/seal (8) and O-ring (5) on to the motor shaft. 21. Rotate the receptacle w/seal (8) counterclockwise until it snaps into place on the motor mounting nuts (7). 22.

  • Page 31: Lamp Holder

    SERVICE (cont.) HOT/COLD SWITCH (Optional) (cont.) If continuity is present as described, the hot/cold switch is operating properly. If continuity is not present as described, replace the switch. Removal and Replacement: 1. Remove all wires from the switch terminals. 2. Remove the mounting nut on the front of the whip- per motor mounting panel.

  • Page 32: Lamp

    SERVICE (cont.) LAMP HOLDER Removal and Replacement: (Refer to Fig. 22) 1. Open dispenser door (1). 2. Remove the five #6-32 screws securing lower door panel (5) to the door (1) and remove cover. 3. Disconnect the door wiring harness from the door interconnect wiring harness.

  • Page 33: Limit Thermostat

    SERVICE (cont.) LIMIT THERMOSTAT FIG. 23 LIMIT THERMOSTAT Location: The limit thermostat is located in the center of the tank lid. Test Procedures: 1. Disconnect the dispenser from the power source. 2. Disconnect both black wires from the limit ther- mostat.

  • Page 34: Rinse/Run Switch

    SERVICE (cont.) OVERFLOW PROTECTION SWITCH (cont.) If continuity is present as described, reconnect the red wires to the black wire and the blue wire from the main harness. If continuity is not present as described, replace the overflow protection switch. Removal and Replacement: 1.

  • Page 35: Solenoid (Cold Drink - Optional)

    SERVICE (cont.) RINSE /RUN SWITCH (cont.) 5. Refer to Fig. 28 when connecting the wires to the new switch. 6. Install new switch with wires attached through the hole in the whipper motor mounting panel and secure with facenut. BLU from Control Board J3-8 GRN from Control Board J3-7...

  • Page 36: Solenoid (Dispense)

    SERVICE (cont.) SOLENOID VALVE (COLD WATER - OPTIONAL) (cont.) 4. Disconnect the water lines to and from the sole- noid valve. 5. Loosen the two #8-32 screws and washers se- curing the solenoid mounting bracket to the base. Remove solenoid bracket and solenoid valve as an assembly.

  • Page 37: Solenoid (Hot Water - Optional)

    SERVICE (cont.) SOLENOID VALVES (DISPENSE) (cont.) Removal and Replacement: 1. Remove the white and white/violet, orange or tan wires from the solenoid valve. 2. Turn off the water supply to the dispenser. 3. Drain enough water from the tank (approximately 1.0 gallon) so the water level is below the dispense valve mounting hole.

  • Page 38: Solenoid (Inlet)

    SERVICE (cont.) HOT WATER DISPENSE SOLENOID VALVE (cont.) 6. Check the solenoid valve for coil action. Connect the dispenser to the power source. Listen carefully in the vicinity of the solenoid valve for a “clicking” sound as the coil magnet attracts. 7.

  • Page 39: Tank Heater

    SERVICE (cont.) SOLENOID VALVE (INLET) (cont.) 6. Check the solenoid valve for coil action. Connect the dispenser to the power source. Listen care- fully in the vicinity of the solenoid valve for a "click- ing" sound as the coil magnet attracts. 7.

  • Page 40: Tank Heater Switch

    SERVICE (cont.) TANK HEATER (cont.) 5. Check for continuity across the tank heater termi- nals. 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.

  • Page 41: Tank Heater Switch

    SERVICE (cont.) TANK HEATER SWITCH (cont.) Test Procedure: 1. Disconnect the dispenser from the power source. 2. Disconnect the black or white/brown wires from the main harness. 3. With the switch in the “ON” (lower) position check for continuity between the center and the upper terminal.
  • Page 42 SERVICE (cont.) TRANSFORMER (cont.) 5. Check the voltage between J1-1 and J1-2 on the eight pin connector at the control board. Connect the dispenser to the power source. The indication must be 24 volts ac. If voltage is present as described the transformer is operating properly.
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  • Page 46: Fmda Dbc

    SCHEMATIC WIRING DIAGRAM FMDA DBC-3 TANK HEATER SWITCH BLK-16 BLK-16 BLU/BLK BLK-16 BLK-16 WHI/GRN WHI/GRN WHI/GRN J1-1 TRANSFORMER WHI/BLK WHI/BLK WHI/BLK WHI/ORN J1-5 WHI/BLU WHI/RED J1-8 WHI/VIO J2-1 J2-5 RIGHT DISPENSE WHI/VIO CENTER DISPENSE LEFT DISPENSE RED/BLK J3-1 BRN/BLK WHI/BRN WHI/VIO WHI/BLU J3-5...

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