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Manafacture: Bunn File size: 935.4 kb File name: 37236.0000.pdf Language of manual:

Test Procedures: 1. Disconnect the brewer from the power source. 2. Disconnect the white/violet and white/green wires from the solenoid valve. With the ON/OFF switch in the "ON" position ("UNSWEET" or "SWEET" position for brewers with sweetener option), press the start switch. 3. With a voltmeter, check the voltage across the white/violet and white/green wires. Connect the brewer to the power source. The indication must be: a) 120 volts ac for two wire 120 volt models. b) 230 volts ac for two wire 230 volt models. c) 100 volts ac for two wire 100 volt models. 4. Disconnect the brewer from the power source, If voltage is present as described, proceed to #5 If voltage is not present as described, refer to Wiring Diagramsand check brewer wiring harness. 5. Check for continuity across the solenoid valve coil terminals. If continuity is present as described, reconnect the white/violet from the brew timer and white/green wire from the brew timer. If continuity is not present as described, replace the solenoid valve. 6. Check the solenoid valve for coil action. Connect the brewer to the power source. With ON/OFF switch in the "ON" position ("UNSWEET" position for brewers with sweetener option), press START switch and listen carefully in the vicinity of the solenoid valve for a "clicking" sound as the coil magnet attracts. 7. Disconnect the brewer from the power source. If the sound is heard as described and water will not pass through the solenoid valve, there may be a blockage in the water line before the solenoid valve or, the solenoid valve may require inspection for wear, and removal of waterborne particles. If the sound is not heard as described, replace the solenoid valve. Removal and Replacement: 1. Remove all wires from solenoid valve. 2. Turn off the water supply to the brewer. 3. Disconnect the water lines to and from the solenoid valve. 4. Remove the two #8-32 keps nuts holding the mounting bracket to the hood. 5. Lift out the bracket. 6. Remove the two #10-32 slotted-head screws holding the solenoid valve to the mounting bracket. 7. Securely install the new solenoid valve to the mounting bracket. 8. Attach the mounting bracket to the hood. 9. Securely fasten the water lines to and from the solenoid valve. 10. Refer to the Fig. 3 when reconnecting the wires WHI/GRN to Brew Timer TL4 BREW SOLENOID P2843 FIG. 3 SOLENOID VALVE TERMINALS WHI/VIO to Brew Timer TL1 37236 080504 Page 16 SERVICE (cont.) DIGITAL BREW TIMER FIG. 4 DIGITAL BREW TIMER P3047 Location: The timer is located inside 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 power source and remove the top cover. 2. Remove the two #8-32 screws securing circuit board to the mounting bracket. 3. Remove circuit board and spacers (as required). 4. With a voltmeter, check the voltage across terminals TL1 and TL2 when the "ON/OFF" switch is in the "ON" position. Connect the brewer to the power source. The indication must be: a) 120 volts ac for two wire 120 volt models b) 230 volts ac for two wire 230 volt models. c) 100 volts ac for two wire 100 volt models. 5. Disconnect the brewer from the power source. If voltage is present as described, proceed to #6. If voltage is not present as described, refer to the Wiring Diagrams and check the brewer wiring harness. 6. With a voltmeter, check the voltage across terminals TL1 and TL4 when the "ON/OFF" switch is in the "ON" position. Connect the brewer to the power source. The indication must be 0 volts. If voltage is as described, proceed to #7. If voltage is not as described, disconnect the brewer from the power source and replace the timer. 7. With a voltmeter, check the voltage across terminals TL1 and TL4 when the "ON/OFF" switch is in the "ON" position. Connect the brewer to the power source and press the "START" switch. The indication must be as follows: a) 120 volts ac for two wire 120 volt models. b) 230 volts ac on two wire 230 volt models. c) 100 volts ac for two wire 100 volt models. If voltage is present as described, the brew timer is operating properly. Reset the timer as required, to obtain the desired brew volume. If voltage is not present as described, disconnect the brewer from the power source and replace the timer. Removal and Replacement: 1. Remove the two #8-32 screws securing circuit board to the mounting bracket. 2. Remove circuit board and spacers (as required). 3. Remove all wires from the timer. 4. Attach all wires to the replacement timer board prior to installation to the component mounting bracket. Refer to FIG. 5 when reconnecting the wires. 5. Install new circuit board with spacers (as required) to the hood. 6. Adjust the timer as described below. Timer Setting: NOTE: Prior to setting or modifying volumes, check that the brewer is connected to water supply, the tank is properly filled, and a funnel and server are in place. ...

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