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Bunn TU3 - page 1
TU3 HOT LIQUID ! CAUTION OPERA TING & SERVICE MANUAL BUNN-O-MA TIC CORPORA TION 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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Bunn TU3 - page 2
Page 2 CONTENTS Introduction ..................................................................... 2 Warranty .......................................................................... 2 User Notices .................................................................... 3 Electrical & Plumbing Requirements ............................... 4 Initia ...
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Bunn TU3 - page 3
Page 3 10225 031804 00831.0000F 3/98 ©1988 BUNN-O-MA TIC CORPORATION READ THE ENTIRE OPERA TING MANU AL BEFORE BUYING OR USING THIS PR ODUCT THIS APPLIANCE IS HEA TED WHENEVER CONNECTED T O A POWER SOURCE F AILURE T O COMPL Y RISKS EQ UIPMENT D AMAGE, FIRE, OR SHOCK HAZARD Fill water tank before turning -on thermostat or connecting appliance to po ...
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Bunn TU3 - page 4
Page 4 ELECTRICAL REQUIREMENTS CAUTION - The brewer must be disconnected from the power sour ce until specified in Initial Set-Up. 120V model brewers require 2-wire, grounded service rated 120 volts ac, 15 amp, single phase, 60 Hz. "A" model brewers require 2-wire, grounded service rated 240 volts ac, 10 amp, single phase, 50 Hz. "B& ...
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Bunn TU3 - page 5
Page 5 INITIAL SET -UP CAUTION - The brewer must be disconnected from the power sour ce throughout the initial set-up, except when specified in the instructions. 1. Remove the top lid from the brewer . 2. Rotate the control thermostat knob fully counter clockwise to the "OFF" position and replace the top lid. 3. Set the delay knob of the ...
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Bunn TU3 - page 6
Page 6 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. Repeat steps 27-30 until the proper dilution timing is achieved. ADJUSTING BREW VOLUMES CAUTION - Disconnect the power sour ce from th ...
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Bunn TU3 - page 7
Page 7 10225 031804 AUTO SWEETENER SET -UP (cont.) 5. Plug brewer into the power sour ce. 6. Place an empty reservoir under the dilution nozzle of the brewer . 7. Close the adjustment valve on the rear of the brewer fully (clockwise), then open (counter clockwise) 1/2 turn. 8. Set the selector switch to the "Sweetened" side and press the ...
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Bunn TU3 - page 8
Page 8 10225 031804 CLEANING (cont.) 2. Place the ON/OFF switch in the "OFF" position. Remove and thoroughly rinse the sprayhead. The holes must be open and clear of any mineral deposits. Wipe the sprayhead panel clean with a damp cloth. 3. Insert the deliming spring into the sprayhead fitting until no more than two inches is visible and ...
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Bunn TU3 - page 9
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 T echnical Service Department. • Inspection, testing, and repair of electrical equipment should be performed only b ...
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Bunn TU3 - page 10
Page 10 TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Brew cycle will not start (cont.) W ater is not hot Dilution cycle will not start 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. Use ...
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Bunn TU3 - page 11
Page 11 TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Dilution cycle will not start (cont.) Inconsistent beverage level in dis- penser Consistently high or low beverage level in the dispenser 4. Dilution Solenoid V alve 1. Internal Flow Control (.195 GPM) 2. Syphon System 3. Lime Build-up CAUTION - T ank and tank compo- nents should be deli ...
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Bunn TU3 - page 12
Page 12 TROUBLESHOOTING (cont.) PROBLEM Spitting or excessive steaming Drip-out time too long Dripping from sprayhead W ater flows into tank continuously (ON/OFF Switch "ON") W ater flows into tank continuously (ON/OFF Switch "OFF") PROBABLE CAUSE 1. Lime Build-up CAUTION - T ank and tank compo- nents should be delimed regularly ...
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Bunn TU3 - page 13
Page 13 TROUBLESHOOTING (cont.) PROBLEM Beverage overflows dispenser W eak beverage PROBABLE CAUSE 1. Dispenser 2. Brew Timer 3. Brew Solenoid Valve 4. Dilution Timer 5. Dilution Solenoid V alve 1. Filter T ype 2. T ea 3. Sprayhead 4. Funnel Loading 5. Water T emperature REMEDY The dispenser must be completely empty before starting a brew cycle. Re ...
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Bunn TU3 - page 14
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. Plumbing lines should not be rest- ing on the counter top. (A) The brewer must be connected to a cold water line. (B) W ater pressure to the brewer ...
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Bunn TU3 - page 15
Page 15 SERVICE This section provides procedures for testing and replacing various major components used in this brewer should service become necessar y . Refer to T roubleshooting 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 ...
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Bunn TU3 - page 16
Page 16 SERVICE (cont.) BREW SOLENOID V AL VE FIG. 2 BREW SOLENOID V AL VE P1277.40 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. Disconnect the white/violet and white/green wires from the solenoid valve. W ...
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Bunn TU3 - page 17
Page 17 SERVICE (cont.) BREW TIMER (Early Models) FIG. 4 BREW TIMER P1276.40 Location: The brew timer is located in the hood. It consists of the left dial plate and circuit board. T est Procedure: 1. Disconnect the brewer from the power sour ce. 2. Remove the wires from terminals TL3, TL4, & TL5 of the timer and rotate the dial fully counter cl ...
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Bunn TU3 - page 18
Page 18 10225 071500 SERVICE (cont.) DIGIT AL BREW TIMER (Late Models) FIG. 6 DIGIT AL BREW TIMER P2202.40 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. 1. Disconnect the brewer from the p ...
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Bunn TU3 - page 19
Page 19 10225 103000 To increase a brew volume, place the ON/OFF switch in the "ON" position, press and hold the ST ART 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- vio ...
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Bunn TU3 - page 20
Page 20 SERVICE (cont.) CONTROL THERMOST A T FIG. 8 CONTROL THERMOST A T P1276.40 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. 3. With a voltmeter , check the voltag ...
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Bunn TU3 - page 21
Page 21 SERVICE (cont.) DILUTION SOLENOID V AL VE FIG. 10 DILUTION SOLENOID V AL VE P1277.40 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. T est Procedure: 1. Disconnect the brewer from the power sour ce. 2. With a voltmeter , check ...
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Bunn TU3 - page 22
Page 22 SERVICE (cont.) DILUTION TIMER FIG. 12 DILUTION TIMER P1276.40 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. T est Procedure: 1. Disconnect the brewer from the power source and remove the wires from terminals TL3, TL4, & TL5 of the timer and rot ...
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Bunn TU3 - page 23
Page 23 SERVICE (cont.) LIMIT THERMOST A T FIG. 14 LIMIT THERMOST A T P1276.40 Location: The limit thermostat is located inside the hood on the tank lid. T est Procedure: 1. Disconnect the brewer from the power source and remove the black wire from the limit thermostat. 2. With a voltmeter , check the voltage across the black wire removed from the ...
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Bunn TU3 - page 24
Page 24 Q U IC K BR E W SERVICE (cont.) ON/OFF SWITCH (SELECTOR SWITCH - OPTIONAL) FIG. 16 ON/OFF SWITCH P1187.40 Location: The ON/OFF switch is located in the front of the hood, above and to the left of the brew funnel. T est Procedure: Brewers W/Out Half Batch Option 1. Disconnect the brewer from the power source. 2. Remove the black and white/vi ...
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Bunn TU3 - page 25
Page 25 Removal and Replacement: 1. Remove the wires from the switch terminals. 2. Compress the clips inside the hood and gently push the switch through the opening. 3. Push the new switch into the opening and spread the clips to hold the switch captive in the hood. 4. Refer to FIG. 17 when reconnecting the wires. SERVICE (cont.) ON/OFF SWITCH (SEL ...
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Bunn TU3 - page 26
Page 26 ST ART SWITCH HOT LIQUID ! CAUTION FIG. 18 ST AR T SWITCH P1187.40 Location: The start switch is located in the front of the hood, above and to the right of the brew funnel. T est Procedure: 1. Disconnect the brewer from the power source. 2. Remove the wires from all four terminals. 3. Check for continuity across the two terminals on the ri ...
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Bunn TU3 - page 27
Page 27 SERVICE (cont.) 10225 031804 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. T est Procedure: 1. Disconnect the brewer from the power sour ce. 2. With a voltmeter , check the voltage across the brown/white and white/violet wir ...
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Bunn TU3 - page 28
Page 28 SERVICE (cont.) T ANK HEA TER FIG. 23 T ANK HEA TER TERMINALS P1284 FIG. 22 T ANK HEA TER Location: The tank heater is located inside the tank and se- cured to the tank lid. T est 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 mod ...
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Bunn TU3 - page 29
Page 29 10225 071500 ...
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Bunn TU3 - page 30
Page 30 10225 071500 ...
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Bunn TU3 - page 31
Page 31 10225 021804 27432.0000D 02/04 © 1996 BUNN-O-MATIC CORPORATION BRN/WHI WHI/BLU WHI/VIO WHI WHI WHI/BLU WHI/YEL WHI/ORN SCHEMATIC WIRING DIAGRAM TU3 W/SWEETENER 120 VOLTS AC 2 WIRE SINGLE PHASE READY INDICATOR BLU/BLK BLK SELECTOR SWITCH UNSWEET/OFF/SWEET ...
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Bunn TU3 - page 32
Page 32 10225 071500 ...
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