Bunn TU3 Operating & Service Manual
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Bunn TU3 Operating & Service Manual

Bunn corporation operating & service manual tu3
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TU3
!
CAUTION
H O T
L I Q U I D
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
10225.0000N
03/04 ©1987 Bunn-O-Matic Corporation

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  • Page 1 CAUTION H O T L I Q U I D 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 10225.0000N 03/04 ©1987 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 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

    FAILURE TO COMPLY RISKS EQUIPMENT DAMAGE, FIRE, OR SHOCK HAZARD READ THE ENTIRE OPERATING MANUAL BEFORE BUYING OR USING THIS PRODUCT THIS APPLIANCE IS HEATED WHENEVER CONNECTED TO A POWER SOURCE 00831.0000F 3/98 ©1988 BUNN-O-MATIC CORPORATION Page 3 #03408.0002 #03409.0002 10225 031804...

  • 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: Initial Set-Up

    26. Reinstall the metal discharge tip into the funnel. 27. Load the funnel with a BUNN® paper filter 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 concen- trate and dilution cycles to occur.

  • Page 6: Adjusting Brew Volumes

    INITIAL SET-UP (cont.) 29. If not, unplug the brewer and remove the top lid. 30. Adjust the delay knob of the timer on the right side of the hood as required. Replace the top lid and plug in the brewer. 31.

  • Page 7: Operating Controls

    AUTO SWEETENER SET-UP (cont.) Plug brewer into the power source. Place an empty reservoir under the dilution nozzle of the brewer. Close the adjustment valve on the rear of the brewer fully (clockwise), then open (counterclockwise) 1/2 turn. Set the selector switch to the "Sweetened" side and press the "Start" switch momentarily. (After approxi- mately 3 minutes the sweetener will come out of the dilution nozzle.) Run sweetener for 1 minute, then set selector switch to the "Off"...

  • Page 8: Auto Sweetener Cleaning

    This procedure should be performed weekly or as needed to keep the system clear. 1. Begin each brew cycle with a clean empty brew funnel and server. (Be sure the server lid doesn’t interfere with the flow of dilution water.) 2. Insert a BUNN ® filter into the funnel.

  • 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 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 by- pass limit thermostat or thermal cut-off.
  • Page 11 TROUBLESHOOTING (cont.) PROBLEM Dilution cycle will not start (cont.) Inconsistent beverage level in dis- penser 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 continuously (ON/OFF Switch "ON") Water flows into tank continuously (ON/OFF Switch "OFF") PROBABLE CAUSE 1. Lime Build-up CAUTION - Tank and tank compo- nents should be delimed regularly depending on local water condi- tions.
  • Page 13 A clean stainless steel spray-head must be used for proper extrac- tion. The BUNN ® paper filter must be centered in the funnel and the bed of tea leaves leveled by gentle shak- ing.
  • Page 14 1. Solenoid(s) 2. Plumbing Lines 3. Water Supply 4. Tank Heater Page 14 REMEDY The BUNN ® paper filter must be centered in the funnel and the bed of grounds leveled by gently shak- ing. The nut on the solenoid(s) must be tight or it will vibrate during opera- tion.

  • 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 qualified service personnel.

  • 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: Brew Timer (Early Models)

    SERVICE (cont.) BREW TIMER (Early Models) FIG. 4 BREW TIMER Location: The brew timer is located in the hood. It consists of the left dial plate and circuit board. Test Procedure: 1. Disconnect the brewer from the power source. 2. Remove the wires from terminals TL3, TL4, & TL5 of the timer and rotate the dial fully counterclock- wise.

  • Page 18: Digital Brew Timer (Late Models)

    SERVICE (cont.) DIGITAL BREW TIMER (Late Models) 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 (Late Models) (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 pre- vious volume setting will remain in memory.) Each...

  • Page 20: Control Thermostat

    SERVICE (cont.) CONTROL THERMOSTAT FIG. 8 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 21: Dilution Solenoid Valve

    SERVICE (cont.) DILUTION SOLENOID VALVE FIG. 10 DILUTION SOLENOID VALVE Location: Viewing the brewer from the rear the dilution so- lenoid is mounted on the center of the solenoid mount- ing bracket which is secured to the trunk base. Test Procedure: 1.

  • Page 22: Dilution Timer

    SERVICE (cont.) DILUTION TIMER FIG. 12 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 23: Limit Thermostat

    SERVICE (cont.) LIMIT THERMOSTAT FIG. 14 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 24: On/Off Switch

    SERVICE (cont.) ON/OFF SWITCH (SELECTOR SWITCH - OPTIONAL) 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.
  • Page 25 SERVICE (cont.) ON/OFF SWITCH (SELECTOR SWITCH - OPTIONAL)(CONT.) Brewers W/Sweetener Option: 1. Disconnect the brewer from the power source. 2. With a voltmeter, check the voltage across the black wire and white wire on the selector switch. 3. Connect the brewer to the power source. The in- dication must be: a) 120 volts ac for two wire 120 volt models.

  • Page 26: Start Switch

    SERVICE (cont.) START SWITCH FIG. 18 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 27: Sweetener Solenoid Valve (Optional)

    SERVICE (cont.) SWEETENER SOLENOID VALVE (OPTIONAL) FIG. 20 SWEETENER SOLENOID VALVE Location: Viewing the brewer from the rear the sweetener solenoid is mounted on the right side of the solenoid mounting bracket which is secured to the trunk base. Test Procedure: 1.

  • Page 28: Tank Heater

    SERVICE (cont.) TANK HEATER FIG. 22 TANK HEATER Location: The tank heater is located inside the tank and se- cured 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 240 volt models.

  • Page 29: Wiring Diagrams

    10225 071500 Page 29...
  • Page 30 10225 071500 Page 30...
  • Page 31 SCHEMATIC WIRING DIAGRAM TU3 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 27432.0000D 02/04 © 1996 BUNN-O-MATIC CORPORATION SINGLE PHASE Page 31 WHI/BLU 10225 021804...
  • Page 32 10225 071500 Page 32...

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