Bunn TB3 Operating & Service Manual
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Bunn TB3 Operating & Service Manual

Tb3 tb3-lp operating & service manual
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TB3
TB3-LP
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
37235.0000D
05/06 ©2004 Bunn-O-Matic Corporation

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  • Page 1 TB3-LP 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 37235.0000D 05/06 ©2004 Bunn-O-Matic Corporation...

  • Page 2: Table Of Contents

    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 profi ts, 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

    NOTE: When brewing coffee, batch volumes will decrease due to absorption by the coffee grounds. 32540.0000C 09/01 ©1999 Bunn-O-Matic Corporation Page 3 BREWERS 37235 050205...

  • 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 fl ow.

  • Page 5: Initial Set-Up

    CAUTION - The brewer must be disconnected from the power source throughout the initial set-up, except when specifi ed in the instructions. 1. Remove the top lid from the brewer. 2. Rotate the control thermostat knob fully counterclockwise to the "OFF" position and replace the top lid. 3.

  • Page 6: Adjusting Brew Volumes

    26. Reinstall the metal discharge tip into the funnel. 27. Load the funnel with a BUNN® paper fi lter and approximately four ounces of loose tea leaves. 28. Place the ON/OFF switch in the "ON" position, momentarily press the start switch, and allow both the con- centrate and dilution cycles to occur.

  • Page 7: Auto Sweetener Set-Up

    CAUTION - The brewer must be disconnected from the power source throughout the Initial Set-Up, except when specifi ed in the instructions. Remove the top lid and rear panel. Make sure the brewer water supply is off. Connect sweetener hose from the bag in a box delivery system to the rear fi tting marked "Sweetener" . IMPORTANT - System delivery pressure must be regulated between 30-40 psi.

  • Page 8: Cleaning

    1. Begin each brew cycle with a clean empty brew funnel and server. (Be sure the server lid doesn’t interfere with the fl ow of dilution water.) ® 2. Insert a BUNN fi lter into the funnel. 3. Pour the packet of loose fresh tea leaves into the fi lter. Approximately four ounces is recommended.

  • 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 qualifi ed service person- nel.
  • Page 10 TROUBLESHOOTING (cont.) PROBLEM Brew cycle will not start (cont.) Water is not hot Dilution cycle will not start PROBABLE CAUSE 4. ON/OFF Switch 5. Start Switch 6. Brew Timer 7. Brew Solenoid Valve 8. Internal Flow control (.195 GPM) 1. Limit Thermostat CAUTION - Do not eliminate or bypass limit thermostat or thermal cut-off.
  • Page 11 TROUBLESHOOTING (cont.) PROBLEM Dilution cycle will not start (cont.) Inconsistent beverage level in dispenser Consistently high or low beverage level in the dispenser PROBABLE CAUSE 4. Dilution Solenoid Valve 1. Internal Flow Control (.195 GPM) 2. Syphon System 3. Lime Build-up CAUTION - Tank and tank compo- nents should be delimed regularly depending on local water condi-...
  • Page 12 TROUBLESHOOTING (cont.) PROBLEM Spitting or excessive steaming Drip-out time too long Dripping from sprayhead Water flows into tank continu- ously (ON/OFF Switch "ON") or (UNSWEET/OFF/SWEET Switch in "UNSWEET" or "SWEET" position) Water flows into tank continu- ously (ON/OFF Switch "OFF") or (UNSWEET/OFF/SWEET Switch in "OFF"...
  • Page 13 A clean stainless steel sprayhead must be used for proper extrac- tion. The BUNN ® paper fi lter must be centered in the funnel and the bed of tea leaves leveled by gentle shaking.
  • Page 14 2. Flow Adjustment screw is closed 3. Solenoid is defective 4. The Pump is defective Page 14 REMEDY The BUNN ® paper fi lter must be centered in the funnel and the bed of grounds leveled by gently shak- ing.

  • Page 15: Service

    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 electri- cal equipment should be performed only by qualifi...

  • Page 16: Brew Solenoid Valve

    SERVICE (cont.) BREW SOLENOID VALVE FIG. 2 BREW SOLENOID VALVE Location: Viewing the brewer from the rear the brew sole- noid valve is mounted on the left side of the mounting bracket. Test Procedures: 1. Disconnect the brewer from the power source. 2.

  • Page 17: Control Thermostat

    SERVICE (cont.) CONTROL THERMOSTAT FIG. 4 CONTROL THERMOSTAT Location: The control thermostat is located inside hood on the right side just behind the dilution timer. Test Procedures: 1. Disconnect the brewer from the power source. 2. Locate the blue/black wire on the control thermo- stat.

  • Page 18: Digital Brew Timer

    SERVICE (cont.) DIGITAL BREW TIMER FIG. 6 DIGITAL BREW TIMER Location: The timer is located in the hood, on the left side. Test Procedure:. NOTE: Do not remove or install wires while timer board is installed. Pressure applied to one side may cause damage to the board.
  • Page 19 SERVICE (cont.) DIGITAL BREW TIMER (cont.) To increase a brew volume, place the ON/OFF switch in the "ON" position, press and hold the START switch until three clicks are heard. Release the switch and press it again one or more times. (Failure to re- lease the switch within two seconds after the third click causes the volume setting to be aborted and previous volume setting will remain in memory.) Each time the...

  • Page 20: Dilution Timer

    SERVICE (cont.) DILUTION SOLENOID VALVE FIG. 8 DILUTION SOLENOID VALVE Location: Viewing the brewer from the rear the dilution sole- noid is mounted on the center of the solenoid mount- ing bracket which is secured to the trunk base. Test Procedure: 1.

  • Page 21: Dilution Solenoid Valve

    SERVICE (cont.) DILUTION TIMER FIG. 10 DILUTION TIMER Location: The dilution timer is located inside the hood on the right side. It consists of the dial plate with two dials and circuit board. Test Procedure: 1. Disconnect the brewer from the power source and remove the wires from terminals TL3, TL4, &...

  • Page 22: Limit Thermostat

    SERVICE (cont.) LIMIT THERMOSTAT FIG. 12 LIMIT THERMOSTAT Location: The limit thermostat is located inside the hood on the tank lid. Test Procedure: 1. Disconnect the brewer from the power source and remove the black wire from the limit thermostat. 2.

  • Page 23: Start Switch

    SERVICE (cont.) START SWITCH FIG. 14 START SWITCH Location: The start switch is located in the front of the hood, above and to the right of the brew funnel. Test Procedure: 1. Disconnect the brewer from the power source. 2. Remove the wires from all four terminals. 3.

  • Page 24: On/Off Switch

    SERVICE (cont.) ON/OFF SWITCH FIG. 16 ON/OFF SWITCH Location: The ON/OFF switch is located in the front of the hood, above and to the left of the brew funnel. Test Procedure: Brewers W/Out Half Batch Option 1. Disconnect the brewer from the power source. 2.

  • Page 25: Unsweet/Off/Sweet Switch

    SERVICE (cont.) UNSWEET/OFF/SWEET SWITCH (Sweetner Option) FIG. 18 UNSWEET/OFF/SWEET SWITCH Location: The UNSWEET/OFF/SWEET switch is located in the front of the hood, above and to the left of the brew funnel. Test Procedure: 1. Disconnect the brewer from the power source. 2.

  • Page 26: Sweetner Solenoid

    SERVICE (cont.) SWEETNER SOLENOID VALVE FIG. 20 SWEETNER SOLENOID VALVE Location: Viewing the brewer from the front, the sweetener solenoid is mounted on the right side of the solenoid mounting bracket which is secured to the bottom base housing. Test Procedure: 1.

  • Page 27: Tank Heater

    SERVICE (cont.) TANK HEATER FIG. 22 TANK HEATER Location: The tank heater is located inside the tank and secured to the tank lid. Test Procedures: 1. Disconnect the brewer from the power supply. 2. With a voltmeter, check the voltage across the black and white wires on 100 volt and 120 volt models or the black and red wires for 230 volt models.

  • Page 28: Wiring Diagrams

    SCHEMATIC WIRING DIAGRAM TB3, TB3B, TB3-LP OPTIONAL INDICATOR SWITCH & LIMIT THERMOSTAT THERMOSTAT BLU/BLK ON/OFF SWITCH BREW TIMER 5 4 3 2 1 WHI/VIO DILUTION WHI/VIO WHI/VIO WHI/GRN BREW 100 VOLTS AC 120 VOLTS AC 2 WIRE 37234.0000C 05/06 © 2004 BUNN-O-MATIC CORPORATION...
  • Page 29 SCHEMATIC WIRING DIAGRAM TU3, TB3 W/SWEETENER READY INDICATOR BLU/BLK SELECTOR SWITCH UNSWEET/OFF/SWEET WHI/VIO WHI/BLU BRN/WHI WHI/ORN WHI/YEL 120 VOLTS AC 2 WIRE 27432.0000E 08/04 © 1996 BUNN-O-MATIC CORPORATION SINGLE PHASE WHI/BLU Page 29 37235 050205...
  • Page 30 5 4 3 2 1 WHI/VIO DILUTION WHI/VIO WHI/VIO WHI/GRN BREW 230 VOLTS AC 2 WIRE SINGLE PHASE 37234.0005A 05/05 © 2005 BUNN-O-MATIC CORPORATION READY GRN/YEL THERMAL FUSE TANK HEATER "KEEP WARM" HEATER DILUTION TIMER 5 4 3 2 1...
  • Page 31 100 VOLTS AC 120 VOLTS AC 2 WIRE SINGLE PHASE 37235 050205 Page 31...

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