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BUNN
TU3Q-EZ
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
TELEPHONE: (217) 529-6601 FAX: (217) 529-6644
29460.0000C 8/00 © 1999 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. 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. 1. An electrician must provide electrical service as specified. 2. Using a voltmeter, check the voltage at the electrical source. 3. Connect the brewer to the
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OPERATING CONTROLS A. ON/OFF Switch ON - Placing the switch in the left position allows the start switch to activate a timed brew cycle for three gallons of tea. OFF - Placing the switch in the right 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. Start Swi
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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.) BREWING CIRCUIT PROBABLE CAUSE REMEDY PROBLEM Ready light flashing 1. Brewer has shut down due to Refer to Diagnostic Chart for in- malfunction. formation. See page 13 Brew cycle will not start 1. No water Water lines and valves to the brewer must be open. 2. No power or incorrect voltage to Check for voltage across the black the brewer and white terminals at the terminal block. 3. ON/OFF switch not in the "ON" po- The indicator lamp must be lit. sition 4. Start Switch R
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TROUBLESHOOTING (cont.) BREWING CIRCUIT (cont.) PROBLEM PROBABLE CAUSE REMEDY Consistently low beverage level in 1. Brew volume Refer to Adjustments and Optional the dispenser or beverage over- Settings to set brew volume. See flows dispenser 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. 2. Lime build up Inspect the sprayhead tube and
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TROUBLESHOOTING (cont.) BREWING CIRCUIT (cont.) PROBLEM PROBABLE CAUSE REMEDY Weak beverage 1. Sprayhead A seven-hole stainless steel spray- head must be used for proper ex- traction. 2. Water temperature Place an empty brew funnel on an empty vessel of at least 4 gallons beneath the sprayhead. Initiate brew cycle and check the water temperature immediately below the sprayhead with a thermometer. The reading must not be less than 5°F (3°C) below set temperature. Ad- just the temperature setting
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TROUBLESHOOTING (cont.) HEATING CIRCUIT (cont.) PROBLEM PROBABLE CAUSE REMEDY Water does not heat to proper 1. Water not touching temperature Remove probe and grommet. Look temperature probe into hole on tank lid. Water must be within one inch from top of tank. IMPORTANT: Make sure no tem- perature tests are taken before the 2. Temperature Probe Refer to Service - Temperature ready light is "ON". Tank tempera- Probe for testing procedures. See ture must be stabilized before read- page 20 ings ar
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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 Temperature probe wiring Fill valve wiring, function, & strainer Green wire between tank and circuit board 2 Low Tank Level Fault - Water pressure (Is water sh
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SERVICE (cont.) 6. Check the solenoid valve for coil action. Connect BREW SOLENOID VALVE the brewer to the power source. With ON/OFF switch in the "ON" upper position 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 block- age in the water line before the solenoid val
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SERVICE (cont.) 5. With a voltmeter, check the voltage across the ex- LIMIT THERMOSTAT posed terminal of the limit thermostat and the white wire on the tank heater terminal. Connect the brewer to the power source. The indication must be 120 volts ac for two wire 120 volt mod- els. 6. Disconnect the brewer from the power source. If voltage is present as described, reconnect the black wire to the limit thermostat. The limit thermostat is operating properly. If voltage is not present as described,
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SERVICE (cont.) 6. Check for continuity across the center and end ON/OFF SWITCH terminals of the top 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 switch. 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 a
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SERVICE (cont.) Removal and Replacement: TANK HEATER 1. Disconnect the black wire and the white 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. 3. Disconnect vent tube. 4. Remove the six #10 thread cutting screws secur- ing the tank lid to the tank. Remove the green wire. 5. Remove the tank lid with limit thermostat, spray head tube, tank heater and vent tube. 6. Remove the two hex nuts securing the ta
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SERVICE (cont.) TEMPERATURE PROBE Removal and Replacement: 1. Disconnect the brewer from the power source. 2. Pull the existing probe from the tank lid. 3. Cut the white and black wires close to the probe and discard the probe. Do not disconnect these wires from the electronic control assembly. 4. On the new probe, cut the white and black wires near the terminals. Discard the terminals. Insert the new probe into the tank assembly. 5. Insert the white wire from the new probe and the white wire f
