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®
TU5Q
BUNN
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
www.bunnomatic.com
10777.0000B 4/00 © 1994 Bunn-O-Matic Corporation
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CONTENTS Introduction ............................................................. 2 Warranty .................................................................. 2 User Notices ............................................................ 3 Electrical Requirements ........................................... 4 Plumbing Requirements .......................................... 4 Initial Set-Up............................................................ 5 Operating Controls............................
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ELECTRICAL REQUIREMENTS CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up. The brewer requires either 2-wire, grounded service rated 120 volts ac, or 3-wire, grounded service rated 120/208 or 120/240 volts ac, 20 amp, single phase, 60 Hz. Refer to the product's dataplate above the dilution nozzle for actual voltage of your particular brewer model. Electrical Hook-Up CAUTION – Improper electrical installation will damage electronic components. 1. An
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INITIAL SET-UP CAUTION - The brewer must be disconnected from the power source 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 counterclockwise to the "OFF" position. Set the three-gallon timer knob at 4 minutes, the five-gallon timer knob at 6 3/4 minutes, and replace the top lid. 3. Insert an empty funnel into the funnel rails. 4. Place an empty dispenser on the brewer base. 5. Connect
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OPERATING CONTROLS A. Lighted ON/OFF Switch ON - Placing the switch in the lighted upper position allows the start switch to activate a timed brew cycle. OFF - Placing the switch in the lower position stops the brew cycle. Stopping a brew cycle after it has been started will not stop the flow of water into the funnel until the tank syphons down to its proper level. The switch should always be placed in this position after a brew cycle and whenever the brewer is unattended. B. Dilution/No Dilut
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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. • All electronic components have 120 volt ac and low voltage dc potential on their terminals. Shorting of terminals or the ap
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TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Brew cycle will not start (cont.) 6. Brew Timer Refer to Service - Brew Timer for testing procedures. See page 15 7. Brew Solenoid Valve Refer to Service - Brew Solenoid Valve for testing procedures. See page 14 1. Limit Thermostat Water is not hot Refer to Service - Limit Thermostat CAUTION - Do not eliminate or by- for testing procedures. See page 19 pass limit thermostat or thermal cut-off. Use only BOM replacement part #29329.1000 2. Co
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TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Inconsistent beverage level in 1. Syphon System The brewer must be level or slightly dispenser lower in front to syphon properly. 2. Lime Build-up Inspect the tank assembly for ex- CAUTION - Tank and tank compo- cessive lime deposits. Delime as nents should be delimed regularly required. depending on local water condi- tions. Excessive mineral build-up on stainless steel surfaces can ini- tiate corrosive reactions resulting in serious leaks.
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TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Dripping from sprayhead 1. Syphon System The brewer must be level or slightly lower in front to syphon properly. Inspect the tank assembly for ex- 2. Lime Build-up CAUTION - Tank and tank compo- cessive lime deposits. Delime as re- quired. nents should be delimed regularly depending on local water condi- tions. Excessive mineral build-up on stainless steel surfaces can ini- tiate corrosive reactions resulting in serious leaks. 3. Brew Solenoi
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TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY ® Weak beverage (cont.) 4. Funnel Loading The BUNN paper filter must be centered in the funnel and the bed of tea leaves leveled by gentle shak- ing. 5. Water Temperature Place an empty funnel on an empty dispenser beneath the sprayhead. Initiate a brew cycle and check the water temperature immediately be- low the sprayhead with a thermom- eter. The reading should not be less than 200°F. Adjust the control ther- mostat to increase the water
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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. The brewer should be disconnected from the power source when servicing, except when electrical tests are required and the test procedure spe- cific
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SERVICE (cont.) BATCH SELECTOR SWITCH 5. Select the 5-gallon setting. 6. Check for continuity between the terminals where the orange and yellow wires connect to the switch. Continuity should be present. If continuity is present as described, reconnect the wires, the switch is operating properly. If continuity is not present as described, replace the switch. Removal and Replacement: 1. Remove the wires from the switch terminals. 2. Compress the clips inside the hood and gently push the switch thr
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SERVICE (cont.) If continuity is present as described, reconnect the white/violet from the brew timer and white/green wire BREW SOLENOID VALVE 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 press start switch and listen carefully in the vicinity of the solenoid valve for a "clicking" sound as the coil magnet attracts. 7. Disco
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SERVICE (cont.) a) 120 volts ac for 2-wire 120 volt models. b) 208 volts ac for 3-wire 120/208 volt models. CONTROL THERMOSTAT c) 240 volts ac for 3-wire 120/240 volt models. 8. Disconnect the brewer from the power source. If voltage is present as described, reinstall the capil- lary tube into the tank to the line 5.5" above the bulb, the control thermostat is operating properly. If voltage is not present as described, replace the ther- mostat. Removal and Replacement: 1. Remove both wires from
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SERVICE (cont.) If continuity is present as described, reconnect the white/blue wire from the dilution switch and white/ DILUTION SOLENOID VALVE green wire from the brew solenoid terminal. 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 press start switch and listen carefully in the vicinity of the solenoid valve for a "clicking" sound as the coil ma
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SERVICE (cont.) DILUTION SWITCH 5. Set Dilution switch to "NO DILUTION". 6. Check for continuity between the terminals where the white/blue and white/violet connect to the switch. Continuity should not be present. If continuity is present as described, reconnect the wires. The switch is operating properly. If continuity is not present as described, replace the switch. Removal and Replacement: 1. Remove the wires from the switch terminals. 2. Compress the clips inside the hood and gently push th
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SERVICE (cont.) white or red wire on the tank heater terminal. Con- nect the brewer to the power source. The indica- LIMIT THERMOSTAT tion must be: a) 120 volts ac for 2-wire 120 volt models. b) 208 volts ac for 3-wire 120/208 volt models. c) 240 volts ac for 3-wire 120/240 volt models. 6. Disconnect the brewer from the power source. If voltage is present as described, reconnect the blue wire to the limit thermostat. The limit thermostat is operating properly. If voltage is not present as descr
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SERVICE (cont.) 5. Disconnect the brewer from the power source. ON/OFF 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 end terminals of the bottom row when the switch is in the “ON” position. If continuity is present as described, replace the wires, the switch is operating properly. If continuity is not present as described, replace the swit
