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®
BUNN
T3,T3A
T6,T6A
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
TELEPHONE: (217) 529-6601 FAX: (217) 529-6644
10145.0000G 7/00 © 1984 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 ............................
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USER NOTICES Carefully read and follow all notices on the equipment and in this manual. They were written for your protec- tion. All notices on the equipment should be kept in good condition. Replace any unreadable or damaged labels. #00831.0000 #00656.0000 #03408.0000 #03409.0000 10145 021599 Page 3
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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. "A" model brewers require 2-wire, grounded service rated 240 volts ac, 10 amp, single phase, 50 Hz. "B" model brewers require 2-wire, grounded service rated 100 volts ac, 15 amp, single phase, 60 Hz. Proceed as follows: Electrical Hook-Up CAUTION – Improper electrical install
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INITIAL SET-UP (FILL & HEAT) CAUTION - The brewer must be disconnected from the power source throughout the Initial Set-Up, except when specified in the instructions. 1. Complete the electrical and plumbing instructions prior to starting this procedure. 2. Remove the top panel and check that the thermostat dial is rotated fully counterclockwise to the “OFF” position. 3. Set the delay dial at eight minutes. Replace top panel. Plug in brewer. 4. Remove the filter screen and metal ferrule from the
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INITIAL TIMER ADJUSTMENT (cont.) ® 10. Install the ferrule and screen in the funnel. Load the funnel with a BUNN paper filter and approximately four ounces of loose tea leaves. Depress the start button to brew tea and observe the funnel drip out and the dilution streams near the end of the cycle. The dilution stream should stop approximately thirty seconds after the drip out has stopped. 11. If this does not happen, load the funnel with a fresh filter and tea, rotate the delay dial up or down ac
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OPERATING CONTROLS (cont.) B. SELECTOR SWITCH (T6 ONLY) Placing the selector switch in the "ON" (left or right) position allows the start switch to activate a timed brew cycle for three gallons of tea. It also selects into which reservoir dilution water will be introduced. This switch should always be in the "OFF" (center) position after a brew cycle or when the brewer is unattended. C. START SWITCH Starts a brew cycle when the ON/OFF or SELECTOR switch is in the "ON" position. CLEANING CAUTION
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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.) 5. Start Switch Refer to Service - Start Switch for testing procedures. See page 26 6. Brew Timer Refer to Service - Brew Timer for testing procedures. See page 17 or 18 Refer to Service - Brew Solenoid 7. Brew Solenoid Valve Valve for testing procedures. See page 15 8. Internal Flow control (.195 GPM) (A) Direction of flow arrow must be pointing towards brewer. (B) Remove the flow control and check for obs
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TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Dilution cycle will not start (cont.) 4. Dilution Solenoid Valve Refer to Service - Dilution Solenoid Valve for testing procedures. See page 21 Inconsistent beverage level in dis- 1. Internal Flow Control (.195 GPM) (A) Direction of flow arrow must be penser pointing towards the brewer. (B) Remove the flow control and check for obstruction. Clear or re- place. 2. Syphon System The brewer must be level or slightly lower in front to syphon prop
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TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY 1. Lime Build-up Spitting or excessive steaming Inspect tank assembly for excessive CAUTION - Tank and tank compo- lime deposits. Delime as required. 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. 2. Control Thermostat Refer to Service - Control Thermo- stat for testing procedures. See page 20 Drip-ou
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TROUBLESHOOTING (cont.) PROBABLE CAUSE REMEDY PROBLEM Beverage overflows dispenser 1.Dispenser The dispenser must be completely empty before starting a brew cycle. 2. Brew Timer Refer to Service - Brew Timer for testing procedures. See page 17 or 18 3. Brew Solenoid Valve Remove the Brew Solenoid Valve and clean any obstruction. Rebuild or replace the valve if necessary. See page 15 4. Dilution Timer Refer to Service - Dilution Timer for testing procedures. See page 22 5. Dilution Solenoid Valve
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TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY ® Dry tea leaves remain in the funnel 1. Funnel Loading The BUNN paper filter must be centered in the funnel and the bed of grounds leveled by gently shak- ing. Brewer is making unusal noises 1. Solenoid(s) The nut on the solenoid(s) must be tight or it will vibrate during opera- tion. 2. Plumbing Lines Plumbing lines should not be rest- ing on the counter top. 3. Water Supply (A) The brewer must be connected to a cold water line. (B) Water p
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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.) BREW SOLENOID VALVE If continuity is present as described, reconnect the white/violet from the switch 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 or SELECTOR switch in the "ON" (T3 left, T6 left or right) position press start switch and listen care- fully in the vicinity of the solenoid valve for a "click- ing" soun
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SERVICE (cont.) BREW SOLENOID VALVE (cont.) BRN/BLK to Selector Switch WHI/BLU to Dilution Timer TL4 WHI/BLU to Dilution Timer TL4 YEL to Selector Switch WHI/GRN to BREW WHI/VIO to Brew Solenoid WHI/GRN to Brew Timer TL4 WHI/VIO to Brew Timer TL1 Timer TL4 WHI/VIO to WHI/VIO to Brew Dilution Timer TL1 Solenoid DILUTION SOLENOID LT RESERVOIR DILUTION DILUTION SOLENOID SOLENOID RT RESERVOIR BREW BREW SOLENOID SOLENOID T3 T6 P1834 FIG.3 SOLENOID VALVE TERMINALS 10145 072600 Page 16
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Wiring Diagrams and check the wiring harness. SERVICE (cont.) BREW TIMER 5. Check the voltage across terminals TL1 and TL4 with a voltmeter when the ON/OFF or SELECTOR switch is in the “ON” (T3 left, T6 left or right) po- sition and the start switch is momentarily placed in the lower position. Connect the brewer to the power source. The indication must be: a) 120 volts ac for two wire 120 volt models for approximately twenty seconds and then return to its previous indication. b) 240 volts ac fo
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SERVICE (cont.) If voltage is not present as described, refer to the DIGITAL BREW TIMER (Late Models) Wiring Diagrams and check the brewer wiring har- ness. 6. With a voltmeter, check the voltage across termi- nals 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
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SERVICE (cont.) DIGITAL BREW TIMER (Late Models)(cont.) NOTE: When brewing coffee, volume will decrease due to absorption by the coffee grounds. 1. Modifying brew volumes. To modify a brew vol- ume, first check that the SET/LOCK switch is in the 3. Setting programming disable feature. If it be- “SET” position on the circuit board. comes necessary to prevent anyone from changing brew time once programmed, you can set the SET/ To increase a brew volume, place the ON/OFF LOCK switch to the “LOCK” p
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SERVICE (cont.) 240 volt two wire models when the control ther- CONTROL THERMOSTAT mostat is turned fully clockwise. Connect the brewer to the power source. The indication must be: a) 120 volts ac for two wire 120 volt models. b) 240 volts ac for two wire 240 volt models. c) 100 volts ac for two wire 100 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 4.5" above the bulb, the control thermos
