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Bunn TWF-EZ manual

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Table of contents for the manual

  • Page 1

    BUNN-O-MA TIC CORPORA TION TWF-EZ POST OFFICE BOX 3227 SPRINGFIELD, ILLINOIS 62708-3227 TELEPHONE: (217) 529-6601 FAX: (217) 529-6644 29466.0000C 8/00 © 1999 Bunn-O-Matic Corporation OPERA TING & SER VICE MANU AL BU N N ®[...]

  • Page 2

    Page 2 CONTENTS Introduction .............................................................. 2 Warranty ................................................................... 2 User Notices ............................................................. 3 Electrical Requirements ............................................ 4 Plumbing Requirements .......[...]

  • Page 3

    Page 3[...]

  • 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. Proceed as follows: Electrical Hook-Up CAUTION – Improper electrical installation will damage electronic components.[...]

  • Page 5

    Page 5 INITIAL SET -UP 1. Insert the funnel (empty) into the funnel rails. 2. Place an empty tea dispenser on the brewer base. Be prepared to empty the dispenser a few times. 3. Plug in the brewer , place the TEA/OFF/COFFEE switch in the “ COFFEE ” position, and momentarily press the start switch. When the flow of water into the tank stops, pre[...]

  • Page 6

    Page 6 OPERA TING CONTROLS A. TEA/OFF/COFFEE Switch TEA- Placing the switch in the full left position allows the start switch to activate a timed brew cycle for a 0.5 gallon of tea concentrate and 2.5 gallons of dillution water into the dispenser. COFFEE- Placing the switch in the full right position allows the start switch to activate a timed brew[...]

  • Page 7

    Page 7 TWF-EZ ADJUSTMENTS & OPTIONAL SETTINGS[...]

  • Page 8

    Page 8 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[...]

  • Page 9

    Page 9 TROUBLESHOOTING (cont.) BREW CIRCUIT PROBLEM PROBABLE CAUSE REMEDY Ready Light Flashing Brew cycle will not start 1. Brewer has shut down due to malfunction. 1. No water 2. No power or incorrect voltage to the brewer 3. TEA/OFF/COFFEE Switch 4. Start Switch 5. Low water temperature (Brew lockout is enabled) 6. Brew solenoid valves 7. Control[...]

  • Page 10

    Page 10 TROUBLESHOOTING (cont.) BREW CIRCUIT PROBLEM PROBABLE CAUSE REMEDY Refer to Adjustments and Optional Settings to set brew volume. See page 7. Using a stop watch or sec- ond hand, time the length of the brew cycle. Record this time inside the top lid. If service is ever needed again, use the time as reference to determine if time has changed[...]

  • Page 11

    Page 11 TROUBLESHOOTING (cont.) BREW CIRCUIT PROBLEM PROBABLE CAUSE REMEDY Dripping from sprayhead Weak beverage Drip out time too long 1. Lime build up 2. Brew Solenoid V alves 1. Sprayhead 2. Water temperatur e 3. Filter type 4. Funnel loading 1. Funnel Tip (T ea brewing) Inspect the tank assembly for ex- cessive lime deposits. Delime as re- quir[...]

  • Page 12

    Page 12 TROUBLESHOOTING (cont.) BREW CIRCUIT PROBLEM PROBABLE CAUSE REMEDY Dry tea leaves or coffee grounds re- main in the funnel 1. Sprayhead 2. Funnel loading Make sure sprayhead is present and holes are clear and unobstructed. There should be seven separate streams of water coming out of the sprayhead. The BUNN ® paper filter must be centered [...]

  • Page 13

    Page 13 TROUBLESHOOTING (cont.) HEATING CIRCUIT PROBLEM PROBABLE CAUSE REMEDY 29466 082200 W ater does not heat to proper temperature IMPORT ANT : Make sure no tem- perature tests are taken before the ready light is "ON". T ank tempera- ture must be stabilized before read- ings are taken. Spitting or excessive steaming Brewer is making un[...]

  • Page 14

    Page 14 DIAGNOSTICS Intermittent flashing of the READY indicator indicates that a fault exists. Count the number of flashes between pauses and use this chart as a guide to investigating the fault. FLASHES CAUSE THINGS TO CHECK 1 Dry Plug - In Fault - Water Pressure (Is water shut off?) Sheath of temperature probe dry for 10 minutes after power-up T[...]

  • 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 per formed only by qualified servic[...]

  • Page 16

    Page 16[...]

  • Page 17

    Page 17 P1960.60 FIG. 4 ICED TEA BREW SOLENOID V AL VE Location: Viewing the brewer from the rear the iced tea brew solenoid valve is mounted in the center of the mount- ing bracket. Test Procedures: 1. Disconnect the brewer from the power sour ce. 2. Disconnect the white/blue and white wires from the iced tea brew and dilution solenoid valves. Wit[...]

  • Page 18

    Page 18[...]

  • Page 19

    Page 19 SERVICE (cont.) LIMIT THERMOST A T FIG. 8 LIMIT THERMOST A T P1960.60 Location: The limit thermostat is located inside the hood on the tank lid. T est Pr ocedure: 1. Disconnect the brewer from the power sour ce and remove the blue wire from the limit thermostat. 2. With a voltmeter , check the voltage across the blue wire removed from the l[...]

  • Page 20

    Page 20 FIG.11 TEA/OFF/COFFEE SWITCH TERMINALS P1525 SERVICE (cont.) TEA/OFF/COFFEE SWITCH FIG. 10 TEA/OFF/COFFEE SWITCH P1808.40 Location: The TEA/OFF/COFFEE switch is located in the front of the hood, above and to the left of the brew funnel. T est Pr ocedure: 1. Disconnect the brewer from the power sour ce. 2. Remove the black and white/violet w[...]

  • Page 21

    Page 21 SERVICE (cont.) ST ART SWITCH FIG. 12 ST ART SWITCH P1808.40 Location: The start switch is located in the front of the hood, above and to the right of the brew funnel. T est Pr ocedure: 1. Disconnect the brewer from the power sour ce. 2. Remove white/yellow and white/orange wires from the Start switch. 3. Check for continuity across the two[...]

  • Page 22

    Page 22 FIG. 14 T ANK HEA TER Location: The tank heater is located inside the tank and se- cured to the tank lid. T est Pr ocedures: 1. Disconnect the brewer from the power supply . 2. With a voltmeter , check the voltage across the black and white wires. Connect the brewer to the power sour ce. The indication must be 120 volts ac. 3. Disconnect th[...]

  • Page 23

    Page 23 SERVICE (cont.) TEMPERA TURE PROBE FIG. 16 TEMPERA TURE PROBE P1960.60[...]

  • Page 24

    Page 24 SERVICE (cont.) THERMAL FUSE FIG. 18 THERMAL FUSE P1960.60 Location: The thermal fuse is located inside the hood con- nected to the right tank heater terminal. T est Pr ocedures: 1. Disconnect the brewer from the power sour ce. 2. Disconnect the thermal fuse from the tank heater terminal and the limit thermostat. 3. With an ohmmeter , check[...]

  • Page 25

    Page 25 SERVICE (cont.) CONTROL BOARD FIG. 20 CONTROL BOARD P1960.50 TRM1 T R M 2 J 6 J 7 J3 J 1 J4 J2 J 5[...]

  • Page 26

    Page 26 29466 082200[...]