BUNN ® TNT-3 TNTF-3 DISCONTINUED VERSION The information in this manual is no longer current. OPERATING & SERVICE MANUAL BUNN-O-MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD, ILLINOIS 62708-3227 TELEPHONE: (217) 529-6601 FAX: (217) 529-6644 28201.
CONTENTS Introduction ............................................................. 2 Warranty .................................................................. 2 User Notices ............................................................ 3 Electrical Requirements ........................................... 4 Plumbing Requirements .......................................... 4 Initial Set-Up ............................................................ 5 Adjusting Brew Volumes ..................................
USER NOTICES Carefully read and follow all notices on the equipment and in this manual. They were written for your protection. All notices on the equipment should be kept in good condition. Replace any unreadable or damaged labels. #00831.0000 #00656.0000 #03408.0000 #03409.
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 volt ac, 15 amp, single phase, 60 Hz. 120/208V model brewers require 3-wire, grounded service rated 120/ 208 volt, 20 amp, single phase, 60 Hz. L2 RED WHITE 120V.A.C. 208V.A.C. NEUTRAL L1 BLACK 120V.A.C. Electrical Hook-Up CAUTION – Improper electrical installation will damage electronic components. 1.
PLUMBING REQUIREMENTS (cont.) P1394 BREWERS W/OUT FAUCET BREWERS W/FAUCET P1392 1. Remove the shipping cap(s) from the bulkhead fitting(s) on the rear of the brewer. 2. Attach the flare fitting from the short piece of tubing on the strainer/flow control (supplied) to the water inlet fitting(s) at the rear of the brewer. 3. Flush the water line and securely attach it to the flare fitting on the tee or strainer/flow control. 4. Turn on the water supply. 5.
INITIAL SET-UP (cont.) 13. Empty the dispenser. 14. Plug in the brewer and wait for the water in the tank to heat to brewing temperature (approximately 20 minutes). Some water will drip from the funnel during this time; this is due to expansion and should not occur thereafter. 15. Place the ICED/OFF/HOT switch in the “HOT” position and begin another brew cycle. Empty the reservoir after water has stopped flowing from the funnel. 16.
CLEANING CAUTION – Do not keep brewed tea overnight. Clean and sanitize your iced tea dispenser daily 1. Remove and thoroughly clean the brew funnel. The funnel tip and screen must be free from any tea particles or residue. Reassemble the funnel. 2. Unplug the brewer. Remove and thoroughly rinse the sprayhead. The holes must be open and clear of any mineral deposits. Wipe the sprayhead panel clean with a damp cloth. 3.
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 personnel. All electronic components have 120 volt ac and low voltage dc potential on their terminals.
TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE Brew cycle(s) will not start (cont.) 6. Brew Timer A) Iced Tea B) Hot Tea 7. Brew Solenoid Valve A) Iced Tea B) Hot Tea 8. Internal Flow control (.222 GPM) (Hot Tea Only) REMEDY Refer to Service - Brew Timer (Iced Tea) for testing procedures. See page 20 or 21 Refer to Service - Brew Timer (Hot Tea) for testing procedures. See page 17 or 18 Refer to Service - Brew Solenoid Valve (Iced Tea) for testing procedures.
TROUBLESHOOTING (cont.) PROBLEM Dilution (Iced Tea) cycle will not start (cont.) Inconsistent beverage level in dispenser (Hot Tea) PROBABLE CAUSE REMEDY 2. Start Switch Refer to Service - Start Switch for testing procedures. See page 27 3. Brew Timer (Iced Tea) Refer to Service- Brew Timer (Iced Tea) for testing procedures. See page 20 or 21 4. Brew Solenoid Valve (Iced Tea) Refer to Service - Brew Solenoid Valve (Iced Tea) for testing procedures. See page 16 5.
TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE REMEDY Consistently high or low beverage level in the dispenser. (cont.) 2. External Strainer/Flow Control (.750 GPM) (A) Direction of flow arrow must be pointing towards brewer. (B) Remove the strainer/flow control and check for obstructions. Clear or replace. Spitting or excessive steaming 1. Lime Build-up CAUTION - Tank and tank components should be delimed regularly depending on local water conditions.
TROUBLESHOOTING (cont.) PROBLEM PROBABLE CAUSE Water flows into tank continuously (ICED/OFF/HOT Switch in the "ICED or "HOT" position) 1. Brew Timer A) Iced Tea B) Hot Tea Water flows into tank continuously (ICED/OFF/HOT Switch in the "OFF" position) 1. Brew Solenoid Valve A) Iced Tea B) Hot Tea Beverage overflows dispenser REMEDY Refer to Service - Brew Timer (Iced Tea) for testing procedures. See page 20 Refer to Service- Brew Timer (Hot Tea) for testing procedures.
TROUBLESHOOTING (cont.) PROBABLE CAUSE 1. Filter Type REMEDY BUNN® paper filters must be used for proper extraction. 2. Tea A sufficient quantity of fresh, loose tea leaves should be used for proper extraction. 3. Sprayhead A six-hole stainless steel sprayhead must be used for proper extraction. 4. Funnel Loading The BUNN® paper filter must be centered in the funnel and the bed of tea leaves leveled by gentle shaking. 5.
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 electrical equipment should be performed only by qualified service personnel.
SERVICE (cont.) BREW SOLENOID VALVE (HOT TEA) If continuity is not present as described, replace the solenoid valve. 6. Check the hot tea solenoid valve for coil action. Connect the brewer to the power source. With ICED/OFF/HOT switch in the "HOT" position press the 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.
SERVICE (cont.) If continuity is not present as described, replace the solenoid valve. BREW SOLENOID VALVE (ICED TEA) 6. Check the iced tea solenoid valve for coil action. Connect the brewer to the power source. With ICED/OFF/HOT switch in the "ICED" position press the 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.
SERVICE (cont.) If continuity is not present as described, refer to the Wiring Diagram and check the wiring harness. BREW TIMER (HOT TEA - EARLY MODELS) 5. Check the voltage across terminals TL1 and TL4 with a voltmeter when the ICED/OFF/HOT switch is in the “HOT” position and the start switch is momentarily placed in the lower position. Connect the brewer to the power source.
SERVICE (cont.) BREW TIMER (HOT TEA - LATE MODELS) 6. With a voltmeter, check the voltage across terminals TL1 and TL4 when the "ON/OFF" switch is in the "ON" position and the ICED/OFF/HOT switch is in the "HOT" 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.
SERVICE (cont.) BREW TIMER (HOT TEA - LATE MODELS)(cont.) 1. Modifying brew volumes. To modify a brew volume, first check that the SET/LOCK switch is in the “SET” position on the circuit board. To increase a brew volume, place the ON/OFF switch in the “ON” position, press and hold the START switch until three clicks are heard. Release the switch and press it again one or more times.
SERVICE (cont.) If continuity is present as described, reconnect the wires to terminals TL3, TL4, & TL5 of the timer board and proceed to #5. If continuity is not present as described, refer to the Wiring Diagram and check the wiring harness. BREW TIMER (ICED TEA - EARLY MODELS) 5. With a voltmeter, check the voltage across terminals TL1 and TL4 when the ICED/OFF/HOT switch is in the “ICED” position and the start switch is momentarily placed in the lower position. Connect the brewer to the power source.
SERVICE (cont.) BREW TIMER (ICED TEA - LATE MODELS) 6. With a voltmeter, check the voltage across terminals TL1 and TL4 when the "ON/OFF" switch is in the "ON" position and the ICED/OFF/HOT switch is in the "ICED" 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.
SERVICE (cont.) BREW TIMER (ICED TEA - LATE MODELS)(cont.) 1. Modifying brew volumes. To modify a brew volume, first check that the SET/LOCK switch is in the “SET” position on the circuit board. To increase a brew volume, place the ON/OFF switch in the “ON” position, press and hold the START switch until three clicks are heard. Release the switch and press it again one or more times.
SERVICE (cont.) b) 208 volts ac for three wire 120/208 volt models 8. Disconnect the brewer from the power source. CONTROL THERMOSTAT If voltage is present as described, reinstall the capillary tube into the tank to the line 4.5" above the bulb, the control thermostat is operating properly. If voltage is not present as described, replace the thermostat. NOTE – The capillary tube must be clear of any electrical termination and not kinked. If voltage is present as described, proceed to #4.
5. Check the solenoid valve for coil action. Connect the brewer to the power source, place the ICED/ OFF/HOT switch in the “ICED” position and momentarily place the start switch in the lower position and release. Listen carefully in the vicinity of the solenoid valve for a “clicking” sound as the coil magnet attracts. 6. Disconnect the brewer from the power source. SERVICE (cont.
SERVICE (cont.) 5. With a voltmeter, check the voltage across the exposed terminal of the limit thermostat and the white wire from the power cord or the red wire from the terminal block. Connect the brewer to the power source. The indication must be: a) 120 volts ac for two wire 120 volt models. b) 208 volts ac for three wire 120/208 volt models. 6. Disconnect the brewer from the power source. LIMIT THERMOSTAT If voltage is present as described, reconnect the blue wire to the limit thermostat.
If voltage is present as described, proceed to #6. If voltage is not present as described, refer to the Wiring Diagram and check the wiring harness. SERVICE (cont.) ICED/OFF/HOT SWITCH 6. Check for continuity across the center and left terminals of the top row when switch is in the "ICED" position and the center and right terminals of the top row when the switch is in the "HOT” position. If continuity is present as described, replace the wires, the switch is operating properly.
SERVICE (cont.) 4. Check for continuity across the two terminals on the left side of the switch when it is held in the lower position. Continuity must not be present across these terminals in the upper position. START SWITCH 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.
SERVICE (cont.) TANK HEATER FIG. 24 TANK HEATER P2213.60 Location: The tank heater is located inside the tank and secured to the tank lid. Test Procedures: 1. Disconnect the brewer from the power supply. 2. With a voltmeter, check the voltage across the black and white wires on 120 volt models or the black and red wires for 120/208 volt models with a voltmeter. Connect the brew to the power source. The indication must be: a) 120 volts ac for two wire 120 volt models .
SERVICE (cont.) THERMAL FUSE (Models W/Faucet Only) Removal and Replacement: 1. Disconnect the thermal fuse from the right tank heater terminal and the black lead from the control thermostat. 2. Remove thermal fuse and discard. 3. Connect new thermal fuse to the right tank heater terminal and the blaclead from the control thermostat 4. Refer to Fig. 27 when reconnecting wires. BLK Lead from Control Thermostat Thermal Fuse P2213.60 FIG.
Page 30 28201 081598
