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See page 16 or 17. Remove the Brew Solenoid Valve and clean any obstruction. Rebuild or replace the valve if necessary. See page 15. BUNN® paper filters must be used for proper extraction. A sufficient quantity of fresh, loose tea leaves should be used for proper extraction. A clean stainless steel sprayhead must be used for proper extraction. 10288 031604 TROUBLESHOOTING (cont.) PROBLEM Weak beverage (cont.) Dry tea leaves remain in the funnel Brewer is making unusual noises PROBABLE CAUSE 4. Funnel Loading 5. Water Temperature 6. Low Brew Water Volume 1. Funnel Loading 1. Solenoid(s) 2. Plumbing Lines 3. Water Supply 4. Tank Heater Page 13 REMEDY The BUNN® paper filter must be centered in the funnel and the bed of tea leaves leveled by gentle shaking. Place an empty funnel on an empty dispenser beneath the sprayhead. Initiate a brew cycle and check the water temperature immediately below the sprayhead with a thermometer. The reading should not be less than 200°F (93°C). Adjust the control thermostat to increase the water temperature. Replace if necessary. Adjust needle valve to achieve 76 oz. water from the sprayhead. To increase volume, turn counterclockwise. To decrease volume, turn clockwise. The BUNN® paper filter must be centered in the funnel and the bed of tea leaves leveled by gently shaking. The nut on the solenoid(s) must be tight or it will vibrate during operation. Plumbing lines should not be resting on the counter top. (A) The brewer must be connected to a cold water line. (B) Water pressure to the brewer must not exceed 90 psi (621 kPa). Install a regulator if necessary to lower the working pressure to approximately 50 psi (345 kPa). Remove and clean lime off the tank heater. See page 23. 10288 031604 SERVICE This section provides procedures for testing and replacing various major components used in this brewer should service become necessary. Refer to Troubleshootingfor assistance in determining the cause of any problem. WARNING -Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel. The brewer should be disconnected from the power source when servicing, except when electrical tests are required and the test procedure specifically states to plug-in the brewer. COMPONENT ACCESS WARNING - Disconnect the brewer from the power source before the removal of any panel or the replacement of any component. All components are accessible by the removal of the top cover and rear inspection panel. The top cover is attached with four #6-32 screws. Removal of the top cover will allow access to ON/OFF (UNSWEET/OFF/SWEET) switch, START switch, brew timer, brew solenoid, control thermostat, limit thermostat and tank heater. Contents Brew Solenoid Valve ............................................ 15 Brew Timer (Early Models) .................................. 16 Digital Brew Timer (Late Models) ........................ 17 Control Thermostat.............................................. 19 Limit Thermostat ................................................. 20 ON/OFF Switch..................................................... 21 Start Switch ......................................................... 22 Tank Heater .......................................................... 23 Sweetener Solenoid Valve.................................... 24 OFF/SELECTOR Switch (Sweetener Option)......... 25 Wiring Diagrams.................................................. 26 Page 14 P2092.40 FIG. 1 COMPONENT ACCESS 10288 031604 SERVICE (cont.) BREW SOLENOID VALVE FIG. 2 BREW SOLENOID VALVE P2087.40 Location: Viewing the brewer from the top, the brew solenoid valve is mounted on the right side of the brewer. 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 ...