Bunn TW Operating & Service Manual
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Bunn TW Operating & Service Manual

Bunn TW Operating & Service Manual

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BUNN
®
TW
TWF
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
TELEPHONE: (217) 529-6601 FAX: (217) 529-6644
10510.0000 11/00 © 1990 Bunn-O-Matic Corporation

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  • Page 1 BUNN ® OPERATING & SERVICE MANUAL BUNN-O-MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD, ILLINOIS 62708-3227 TELEPHONE: (217) 529-6601 FAX: (217) 529-6644 10510.0000 11/00 © 1990 Bunn-O-Matic Corporation...

  • Page 2: Table Of Contents

    SPECIFIED HEREIN, TO REPAIR OR, AT BUNN’S SOLE OPTION, 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 substi- tute equipment, facilities or services, or any other special, incidental or consequential damages.

  • Page 3: User Notices

    USER NOTICES Carefully read and follow all notices on the equipment and in this manual. They were written for your protec- tion. All notices on the equipment should be kept in good condition. Replace any unreadable or damaged labels #00656.0000 #03408.0000 #00831.0000 #02822.0000...

  • Page 4: Electrical 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

    PLUMBING REQUIREMENTS (cont.) P1394 P1392 BREWERS W/FAUCET BREWERS W/OUT FAUCET INITIAL SET-UP CAUTION – The brewer must be unplugged throughout the initial set-up, except when specified in the instruc- tions. 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 Controls

    INITIAL SET-UP (cont.) ADJUSTING BREW VOLUMES CAUTION - Disconnect the power source from the brewer prior to the removal of any panel for the replacement or adjustment of any component. NOTE: Prior to setting or modifying batch sizes, check that the brewer is connected to water supply, the tank is properly filled, and a funnel and server are in place.

  • Page 7: Operating Controls

    1. Begin brewing with a clean empty brew funnel and dispenser. (Be sure the server lid doesn't interfere with the flow of dilution water) ® 2. Insert a BUNN filter into the funnel. 3. Pour the packet of fresh tea leaves or coffee into the filter. Approximately 4 ounces is recommended for tea.

  • Page 8: 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 person- nel.
  • Page 9 TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Brew cycle(s) will not start (cont.) 6. Brew Timer Refer to Service - Brew Timer (Iced A) Iced Tea Tea) for testing procedures. See page 20 or 21 B) Hot Coffee Refer to Service - Brew Timer (Hot Coffee) for testing procedures.
  • Page 10 TROUBLESHOOTING (cont.) PROBABLE CAUSE PROBLEM REMEDY Dilution (Iced Tea) cycle will not 2. Start Switch Refer to Service - Start Switch for start (cont.) testing procedures. See page 27 Refer to Service- Brew Timer (Iced 3. Brew Timer (Iced Tea) Tea) for testing procedures.
  • Page 11 TROUBLESHOOTING (cont.) PROBLEM REMEDY PROBABLE CAUSE Consistently high or low beverage (A) Direction of flow arrow must be 2. External Strainer/Flow Control level in the dispenser. (cont.) (.750 GPM) pointing towards brewer. (B) Remove the strainer/flow con- trol and check for obstructions. Clear or replace.
  • Page 12 TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY 1. Brew Timer Water flows into tank continuously Refer to Service - Brew Timer (Iced A) Iced Tea (TEA/OFF/COFFEE Switch in the Tea) for testing procedures. See "TEA or "COFFEE" position) page 20 or 21 B) Hot Coffee Refer to Service- Brew Timer (Hot Coffee) for testing procedures.
  • Page 13 A six-hole (or seven-hole for Mod- 3. Sprayhead els with 90 oz concentrate option) stainless steel sprayhead must be used for proper extraction. The BUNN ® paper filter must be cen- 4. Funnel Loading tered in the funnel and the bed of tea leaves leveled by gentle shaking.

  • Page 14: 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 15: Brew Solenoid Valve (Hot Coffee)

    SERVICE (cont.) If continuity is not present as described, replace the solenoid valve. BREW SOLENOID VALVE (HOT COFFEE) 6. Check the hot coffee solenoid valve for coil ac- tion. Connect the brewer to the power source. With TEA/OFF/COFFEE switch in the "COFFEE" position press the START switch and listen carefully in the vicinity of the solenoid valve for a "clicking"...

  • Page 16: Brew Solenoid Valve (Iced Tea)

    SERVICE (cont.) If continuity is not present as described, replace the solenoid valve. BREW SOLENOID VALVE (ICED TEA) 6. Check the iced tea solenoid valve for coil action. Connect the brewer to the power source. With TEA/ OFF/COFFEE switch in the "TEA" position press the START switch and listen carefully in the vicin- ity of the solenoid valve for a "clicking"...

  • Page 17: Brew Timer (Hot Coffee- Early Models)

    SERVICE (cont.) If continuity is not present as described, refer to the Wiring Diagrams and check the wiring harness. BREW TIMER (HOT COFFEE- Early Models) 5. With a voltmeter, check the voltage across termi- nals TL1 and TL4 when the TEA/OFF/COFFEE switch is in the “COFFEE”...

  • Page 18: Digital Brew Timer (Hot Coffee-Late Models)

    SERVICE (cont.) DIGITAL BREW TIMER (HOT COFFEE -Late Models) 6. With a voltmeter, check the voltage across termi- nals TL1 and TL4 when the "TEA/OFF/COFFEE" switch is in the "COFFEE" position. Connect the brewer to the power source. The indication must be 0 volts.
  • Page 19 SERVICE (cont.) DIGITAL BREW TIMER (HOT COFFEE - Late ume setting will remain in memory.) Models)(cont.) View the level of the liquid being dispensed. When the desired level is reached, turn the TEA/OFF/COF- 1. Modifying brew volumes. To modify a brew vol- FEE switch to “OFF”.

  • Page 20: Brew Timer (Iced Tea - Early Models)

    SERVICE (cont.) BREW TIMER (ICED TEA - Early Models) 5. With a voltmeter, check the voltage across termi- nals TL1 and TL4 when the TEA/OFF/COFFEE switch is in the “TEA” position and the START switch is momentarily placed in the lower posi- tion.

  • Page 21: Digital Brew Timer (Iced Tea-Late Models)

    SERVICE (cont.) 6. With a voltmeter, check the voltage across termi- nals TL1 and TL4 when the "TEA/OFF/COFFEE" DIGITAL BREW TIMER (ICED TEA - Late Models) switch is in the "TEA" position. Connect the brewer to the power source. The indication must be 0 volts.
  • Page 22 SERVICE (cont.) NOTE: Several ounces of water will continue to sy- DIGITAL BREW TIMER (ICED TEA - Late phon from the tank after turning the switch “OFF”. Models)(cont.) The brewer remembers this volume and will continue 1. Modifying brew volumes. To modify a brew vol- to brew batches of this size until the volume setting ume, first check that the SET/LOCK switch is in the procedure is repeated.

  • Page 23: Control Thermostat

    SERVICE (cont.) 8. Disconnect the brewer from the power source. CONTROL THERMOSTAT If voltage is present as described, reinstall the capil- lary tube into the tank to the line 4.5" above the bulb, the control thermostat is operating properly. If voltage is not present as described, replace the ther- mostat.

  • Page 24: Dilution Solenoid Valve

    SERVICE (cont.) 5. Check the solenoid valve for coil action. Connect the brewer to the power source, place the TEA/ DILUTION SOLENOID VALVE OFF/COFFEE switch in the “TEA” position and mo- mentarily place the START switch in the lower po- sition and release.

  • Page 25: Limit Thermostat

    SERVICE (cont.) LIMIT THERMOSTAT 5. With a voltmeter, check the voltage across the ex- posed terminal of the limit thermostat and the white wire from the power cord or the red wire from the terminal block. Connect the brewer to the power source.

  • Page 26: Tea/Off/Coffee Switch

    SERVICE (cont.) TEA/OFF/COFFEE SWITCH If voltage is present as described, proceed to #6. If voltage is not present as described, refer to the Wir- ing Diagrams and check the wiring harness. 6. Check for continuity across the center and left ter- minals of the top row when switch is in the "TEA"...

  • Page 27: Start Switch

    SERVICE (cont.) START SWITCH 4. Check for continuity across the two terminals on the left side of the switch when it is held in the lower position. Continuity must not be present across these terminals in the upper position. If continuity is present as described, reconnect the wires, the switch is operating properly.

  • Page 28: Tank Heater

    SERVICE (cont.) Removal and Replacement: TANK HEATER 1. Disconnect the black wire and the white or red wire from the tank heater terminals. 2. Remove sprayhead and the hex nut securing the sprayhead tube to the hood. Set aside for reas- sembly.

  • Page 29: Thermal Fuse

    SERVICE (cont.) THERMAL FUSE (Models W/Faucet Only) Removal and Replacement: 1. Disconnect the thermal fuse from the right tank heater terminal and the black lead from the con- trol thermostat. 2. Remove thermal fuse and discard. 3. Connect new thermal fuse to the right tank heater terminal and the black lead from the control ther- mostat 4.

  • Page 30: Half Batch Switch (Optional)

    SERVICE (cont.) HALF BATCH SWITCH (Optional) 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.

  • Page 31: Wiring Diagram

    10510 081599 Page 31...
  • Page 32 READY INDICATOR 10502.0003A 9/00 ©2000 BUNN-O-MATIC CORPORATION 10510 112000 Page 32...

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