Instruction/ maintenance manual of the product Dual TF Bunn
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OPERA TING & SER VICE MANU AL BUNN-O-MA TIC CORPORA TION POST OFFICE BOX 3227 SPRINGFIELD, ILLINOIS 62708-3227 PHONE: (217) 529-6601 FAX: (217) 529-6644 27124.
Page 2 INTRODUCTION This equipment will brew two half-gallon, gallon, or gallon and three forths batches of coffee into awaiting servers at the push of a button. The brewer is also equipped with a hot water faucet for allied beverage use and is designed to interface with a BUNN ® Grinder.
Page 3 Requires 2-wire, grounded service rated 200 to 240 volts ac, 30 amp, single phase 50 or 60 Hz. Requires 3-wire, grounded ser- vice rated 120/208 or 120/240 volts ac, 30 amp, single phase, 60 Hz. 120V A.C. 120V A.C. 120V A.C. 208 or 240V A.C. L2 RED L2 RED WHITE NEUTRAL L1 BLACK L1 BLACK 200 or 240V A.
Page 4 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 and color coding of each conductor at the electrical source.
Page 5 INITIAL SET-UP (cont.) 4. Wait approximately twenty minutes for the water in the tank to heat to the proper temperature. 5. Place an empty server beneath either of the brew stations. Place its associated Selector switch in the desired position, the On/Off switch in the upper position and initiate a brew cycle.
Page 6 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.
Page 7 Remedy (A) Direction of flow arrow must be pointing towards brewer. (B) Remove the strainer/flow con- trol and check for obstructions. Clear or replace. Refer to Service - ON/OFF switch for testing procedures. See page 28 Refer to Service - Start switch for testing procedures.
Page 8 4. Overflow protection switch 5. (A) Level control board & level probe. (Electro/mechanical con- trolled) (B) Electronic controls 1. Brew Selector switch 1. Solenoid valve 2. (A) Level control board and level probe (Electro/mechanical) (B) Control assembly (Electronic) 3.
Page 9 TROUBLESHOOTING (cont.) (B) Control assembly (Electronic) 3. Contactor (Brewers with Recov- ery booster) 4. Tank heaters 5. Triac assembly (Electronic) 6. Relay (Brewers with Recovery Booster) 1. (A) Control thermostat (Electro/ mechanical) (B) Control assembly (Electronic) 2.
Page 10 TROUBLESHOOTING (cont.) Inconsistent beverage level in server. (cont.) Consistently high or low beverage level in server. Dripping from sprayhead. Water overflows filter. Beverage overflows server 2. Improper water pressure 3. Dispense valve 4.
Page 11 TROUBLESHOOTING (cont.) Weak beverage Brewer is making unusual noises. 1. Type of paper filters 2. Coffee 3. Sprayhead 4. Funnel loading 5. Water temperature 1. Solenoid (Inlet) 2. Plumbing lines 3. Water supply 4. Tank Heaters 5. Contactor BUNN ® paper filters should be used for proper extraction.
Page 12 SERVICE This section provides procedures for testing and replacing various major components used in this brewer should service become necessary.
Page 13 SERVICE (cont.) BYPASS VALVE Location: The bypass valves are located inside the right front and the center front of the hood. Test Procedures: 1. Disconnect the brewer from the power source and place 1-3/4 gallon server under funnel. 2. Disconnect the white/green wire and the white/ violet wire on the bypass valve.
Page 14 SERVICE (cont.) BREW SELECTOR SWITCH Location: The brew selector switches are located in the front left and right side of the hood. Test Procedure: Timer: Left or Right 1. Disconnect the brewer from the power supply. 2. Separate the connector on the selector switch harness from the brew timer circuit board.
Page 15 SERVICE (cont.) BREW SELECTOR SWITCH (cont.) P991 TAN GRY PNK To Left or Right Timer WHI/VIO to Left or Right By-Pass Valve WHI/RED to Left or Right Dispense Valve GRY from Left or Right Selec.
Page 16 SERVICE (cont.) CONTACTOR ASSEMBLY Location: The contactor assembly is located inside the hood just to the rear of the right dispense valve. Test Procedures: Mechanical Thermostat (Brewers with or without Recovery Booster) 1. Disconnect the brewer from the power source.
Page 17 SERVICE (cont.) CONTACTOR ASSEMBLY (cont.) Test Procedures : Electronic Control (Brewers w/Recovery Booster) 1. Disconnect the brewer from the power source. 2. Disconnect the gray wire from the black wire on the contactor coil and white /brown wire from the remaining black wire on the contactor coil.
Page 18 6. Gently remove the capillary bulb and grommet from the tank. 7. Check the voltage across the black wires of the control thermostat and the white insert on the three pole 120/208V, 120/240V t.
Page 19 SERVICE (cont.) CONTROL THERMOSTAT (cont.) BLU to Left & Right Ready Lights BLU to RED Lead From Liquid Level Switch BLK to BLK Lead of Contactor Coil BLK toLeft & Right Ready Lights P780 DISPENSE VALVE P975 Location: Dispense valves are located inside the hood in the center of each sprayhead panel.
Page 20 SERVICE (cont.) DISPENSE VALVE (cont.) ELECTRONIC CONTROL ASSEMBLY 10. Recovery Booster Relay 11. Contactor Assembly 12. Bypass Valve 13. Ready Light 14. Solenoid Valve 15. LED 16. Temperature adjust- ment 17. Triac Assy 18. Server Sensor 1. Electronic Control 2.
Page 21 SERVICE (cont.) PROBLEM: LIQUID LEVEL CONTROL SYSTEM DOES NOT REFILL PROBLEM: LIQUID LEVEL CONTROL OVERFLOWS RETRY NO YES YES NO YES REPLACE CONTROL ASSEMBLY (1) DRAIN CUP (4) OVERFLOW ? OVERF.
Page 22 YES YES YES YES NO NO NO NO YES NO NO MEASURE VOLTAGE AT TANK HEATER (5) VOLTAGE PRESENT REPLACE TANK HEATER (5) LIMIT THERMOSTAT (6) OK ? REPLACE LIMIT THERMOSTAT (6) REPLACE CONTROL ASSEMBLY.
Page 23 SERVICE (cont.) ELECTRONIC CONTROLS (cont.) PROBLEM: WATER BOILS YES NO NO NO NO REPLACE CONTROL ASSEMBLY (1) REPLACE TRIAC (17) CHECK FOR SPLIT TANK HEATER (5) DRAIN CUP (4) RETRY LED (13)(15.
Page 24 SERVICE (cont.) ELECTRONIC CONTROL ASSEMBLY (cont.) O N CAUTION ! Failure To Comply Voids Warranty! Hot W ater System s – W ater Tank W ill Fill Automatically W hen Unit Is Connected To Powe.
Page 25 Test Procedure: 1. Disconnect the brewer from the power source. 2. Remove all wires from the switch terminals. 3. Place the selector switch in the left position. 4 Check for continuity across the center and right terminals on the rear of the switch.
Page 26 Location: The level control board is located inside the front of the brewer just left of center on the component bracket Test Procedure: 1. Disconnect the brewer from the power source. 2. Remove the violet wire from terminal 1 & pink wire from terminal 4 of the circuit board.
Page 27 SERVICE (cont.) LEVEL CONTROL BOARD AND LEVEL PROBE (Electro/mechanical only) (cont.) els and three wire 120/240 volt models. b.) 200 to 240 volts ac for two wire 200 or 240 volt models.
Page 28 SERVICE (cont.) Location: The ON/OFF switches are located on the front of the hood just to the left and right of the start switches. Test Procedure: 1. Disconnect the brewer from the power source. 2. Viewing the switch from the back remove the white or red wire from the upper right terminal and the black wire from the center terminal.
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Page 30 Location: The overflow protection switch is located in- side the hood on the center of the tank inside the copper overflow cup. To test the overflow protection switch, access will also be needed to the level control board or electronic control assembly and terminal block.
Page 31 Location: Electro/mechanical Controlled Brewers The relays are located inside the hood, the right relay just to the right of the contactor in front of the tank and left relay is just left of the component bracket in front of the tank.
Page 32 RED BLK to BLK Lead on Contactor Coil BLK to BLK Lead on Thermostat WHI/RED to Left Dispense Valve WHI/BRN to Left Dispense Valve WHI/GRN to Right Dispense Valve BLU to BLU Lead from Thermosta.
Page 33 SERVICE (cont.) SOLENOID VALVE (Inlet) Location: The solenoid valve is located inside the lower right front of the brewer. Test Procedure: 1. Disconnect the brewer from the power source and draw 1/4 gallon of water from faucet. 2. Remove both wires from the solenoid valve coil terminals.
Page 34 SERVICE (cont.) SOLENOID VALVE (Inlet) (cont.) P799 VIO to Level Control Board T1 (Electro/mechanical) WHI/BLU to Control Assy #1 (Electronic) WHI to Level Control Board T3 (120/208V or 120/24.
Page 35 wires, the tank heaters are operating properly. If continuity is not present as described, replace the tank heater(s). NOTE - If the tank heater remains unable to heat, remove and inspect the heater for cracks in the sheath. Electronic Control Models: 1.
Page 36 Location: The timers are located inside the left front of the brewer on the upper part of the component bracket. Test Procedures: 1. Disconnect the brewer from the power source. 2. Disconnect the wires from the timer terminals TL3, TL4 and TL5 and rotate the dial(s) fully counterclockwise.
Page 37 SERVICE (cont.) Timers (Early Models)(cont.) P1070 2 2 2 1.5 1 1 1 .5 2.5 MINUTES MINUTES MINUTES P/N 24486-0000 120 VAC BUNN-O-MATIC 3 3 3 4 4 5 5 6 6 7 8 2 2 2 1.5 1.5 1 1 1 .5 .5 2 .5 2.5 MINUTES MINUTES MINUTES MINUTES MINUTES MINUTES P/N 24486-0000 120 VAC P/N 24486-0000 120 VAC BUNN-O-MATIC BUNN-O-MATIC 3 3 3 4 4 5 5 6 6 7 8 2 2 2 1.
Page 38 SERVICE (cont.) TIMERS (Late Models) P2194 Location: The timers are located inside the left front of the brewer on the upper part of the component bracket. Test Procedures: NOTE: Do not remove or install wires while timer board is installed. Pressure applied to one side may cause damage to the board.
Page 39 J1 J2 TL3 TL5 TL4 TL2 TL1 SET LOCK SET LOCK P2037 SERVICE (cont.) TIMERS (Late Models)(cont.) LEFT TIMER RIGHT TIMER YEL WHI/YEL wire to TL5 WHI/BRN WHI/GRN wire to TL4 PNK PNK wire to TL3 WHI.
Page 40 27201.0001B 5/96 © 1996 BUNN-O-MATIC CORPORATION 120/208 VOLTS AC OR 120/240 VOLTS AC 3 WIRE VIO PROBE PIN-20 1 4 3 2 LIQUID LEVEL BOARD BLK WHI LIMIT THERMOSTAT WHI WHI OVERFLOW PROTECTION SW RED RED SW. & THERMOSTAT READY INDICATORS OPTIONAL RECOVERY BOOSTER BLK BLU K2 N.
Page 41 27201.0002B 5/96 © 1996 BUNN-O-MATIC CORPORATION 200 OR 240 VOLTS AC 2 WIRE VIO PROBE PIN-20 1 4 3 2 LIQUID LEVEL BOARD BLK LIMIT THERMOSTAT OVERFLOW PROTECTION SW RED RED SW. & THERMOSTAT READY INDICATORS OPTIONAL RECOVERY BOOSTER BLK BLU K2 N.
Page 42 GRY 27201.0003B 5/96 © 1996 BUNN-O-MATIC CORPORATION 120/208 VOLTS AC OR 120/240 VOLTS AC 3 WIRE DUAL -TF BREWER ECA W/SERVER SENSOR & TWO-GRINDER INTERFACE BLK RIGHT SW.
Page 43 GRY 27201.0004B 5/96 © 1996 BUNN-O-MATIC CORPORATION 200 OR 240 VOLTS AC 2 WIRE DUAL -ATF BREWER ECA W/SERVER SENSOR & TWO-GRINDER INTERFACE BLK RIGHT SW.
Page 44 27201.0005B 5/96 © 1996 BUNN-O-MATIC CORPORATION 120/208 VOLTS AC OR 120/240 VOLTS AC 3 WIRE VIO PROBE PIN-20 1 4 3 2 LIQUID LEVEL BOARD.
Page 45 GRY 27201.0006B 5/96 © 1996 BUNN-O-MATIC CORPORATION 120/208 VOLTS AC OR 120/240 VOLTS AC 3 WIRE DUAL -TF BREWER ECA W/SERVER SENSOR & ONE-GRINDER INTERFACE BLK RIGHT SW.
Page 46 27201.0007B 5/96 © 1996 BUNN-O-MATIC CORPORATION 200 OR 240 VOLTS AC 2 WIRE VIO PROBE PIN-20 1 4 3 2 LIQUID LEVEL BOARD BLK LIMIT THERMOSTAT OVERFLOW PROTECTION SW RED RED SW. & THERMOSTAT READY INDICATORS OPTIONAL RECOVERY BOOSTER BLK BLU K2 N.
Page 47 GRY 27201.0008B 5/96 © 1996 BUNN-O-MATIC CORPORATION 200 OR 240 VOLTS AC 2 WIRE DUAL -ATF BREWER ECA W/SERVER SENSOR & ONE-GRINDER INTERFACE BLK RIGHT SW.
An important point after buying a device Bunn Dual TF (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Bunn Dual TF yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Bunn Dual TF - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Bunn Dual TF you will learn all the available features of the product, as well as information on its operation. The information that you get Bunn Dual TF will certainly help you make a decision on the purchase.
If you already are a holder of Bunn Dual TF, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Bunn Dual TF.
However, one of the most important roles played by the user manual is to help in solving problems with Bunn Dual TF. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Bunn Dual TF along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
