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Bunn Dual TF - page 1
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 27124.0000 6/00 ©1996 Bunn-O-Matic Corporation BU N N ® DUAL ™ TF 1.75 GALLON B U N N M A N U F A C T U R E D B Y B U N N - O - M A T I C C O R P O R A T I O N S P R I N G F I E L D , I L L ...
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Bunn Dual TF - page 2
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. The brewer is specifically designed for use with BUNN ® .5 ...
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Bunn Dual TF - page 3
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.C. 00831.0000 ELECTRICAL REQUIREMENTS CAU ...
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Bunn Dual TF - page 4
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. 3. Remove the front panel beneath the sprayheads. Models with electronic contro ...
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Bunn Dual TF - page 5
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. 6. Place the On/Off switch in t ...
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Bunn Dual TF - page 6
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. • Inspection, testing, and repair of electrical equipment should be performed only by ...
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Bunn Dual TF - page 7
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. See page 34 Refer to Service - Timer for testing procedures. See ...
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Bunn Dual TF - page 8
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. Overflow protection switch 1. Timer 1. Limit thermostat CAUTION - ...
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Bunn Dual TF - page 9
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. Triac assembly (Electronic) 3. Lime build-up CAUTION - Tank and t ...
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Bunn Dual TF - page 10
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. Bypass valve 1. Timer adjustment 1. Dispense valve 1. Bypass valve 2. Needle Valve 3. Type of pap ...
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Bunn Dual TF - page 11
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. A sufficient quantity of fresh drip or re ...
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Bunn Dual TF - page 12
Page 12 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 pe ...
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Bunn Dual TF - page 13
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. NOTE: ECA MODELS ONLY - B ...
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Bunn Dual TF - page 14
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. 3. Carefully slide the plastic co ...
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Bunn Dual TF - page 15
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 Selector Switch to GRY Lead on Interface Socket PNK from Left Selector Switch to Grinder Switch (Lower Left) PNK from Right Selector Switch to Grinder Swit ...
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Bunn Dual TF - page 16
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. 2. Disconnect the red wire of the two pole 200V or 240V terminal block ...
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Bunn Dual TF - page 17
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. NOTE: ECA MODELS ONLY - Brewer must be a ...
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Bunn Dual TF - page 18
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 terminal blocks and the red insert on two pole 200V, 240V terminal blocks with a voltmeter when the control thermo- stat is turned "ON" (full ...
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Bunn Dual TF - page 19
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. Test Procedures: 1. Disconnect th ...
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Bunn Dual TF - page 20
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. Terminal Block 3. Timers 4. Liquid Level Switch & Overflow Cup 5. Tank Hea ...
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Bunn Dual TF - page 21
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 ? OVERFLOW ? NO OVERFLOW ? REPLACE SOLENOID VALVE (14) DRAIN CUP (4) DISCONNECT WIRE SOLENOID VALVE (14) FROM RETRY REPLACE PROBE (7) DRAIN CUP (4) DISCONNEC ...
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Bunn Dual TF - page 22
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 (1) MEASURE VOLTAGE AT TANK HEATER (5) VOLTAGE PRESENT REPLACE TRIAC (17) CHECK FOR SPLIT TANK HEATER (5) REINSTALL ORIGINAL CONTROL ASSEMBLY (1) REC ...
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Bunn Dual TF - page 23
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) ON WHILE BOILING DISCONNECT BLUE WIRE FROM CONTROL BOARD PIN #7 RETRY STILL BOILING ? REPLACE CONTROL ASSEMBLY (1) the temperature sensor (8) and th ...
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Bunn Dual TF - page 24
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 Power! Coffee Brewers – Fill The Water Tank In Accordance W ith The Installation Instructions! D O NO T Turn O n The Tank H eater Sw itch Until W ater C ...
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Bunn Dual TF - page 25
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. 5. Continuity must not be present across the center and left terminals on the rear of the sw ...
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Bunn Dual TF - page 26
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. 3. Check the voltage across terminals 2 & 3 with a voltme ...
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Bunn Dual TF - page 27
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. 17. Disconnect the brewer from the power source. If voltage is present as described, reinstall the probe, the level control board and level probe are opera ...
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Bunn Dual TF - page 28
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. 3. Ch ...
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Bunn Dual TF - page 29
Page 29 ...
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Bunn Dual TF - page 30
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. Test Procedure: 1. Disconnect the brewer from the power source. 2. Re ...
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Bunn Dual TF - page 31
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. Electronic Controlled Brewers The relay is located inside the hood just to the right of the contactor in fr ...
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Bunn Dual TF - page 32
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 Thermostat BLU to BLU Lead from Liquid Level Board WHI/VIO to Right Dispense Valve RIGHT LEFT GRY to BLK Lead from Contactor Coil WHI/VIO to Right Dispense Val ...
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Bunn Dual TF - page 33
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. 3. Check the voltage across the removed wires: a.) Vi ...
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Bunn Dual TF - page 34
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 120/240V Electro/mechanical) WHI to Terminal Block (120/208V or 120/240V Electronic) Red to Level Control Board T3 (200 or 240V Electro/mechanical or Contro ...
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Bunn Dual TF - page 35
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. Disconnect the brewer from the power source. 2. Disconnect wires from heater(s). 3. Che ...
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Bunn Dual TF - page 36
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. 3. Check the voltage across terminals TL1 and TL2 w ...
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Bunn Dual TF - page 37
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 1.5 ...
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Bunn Dual TF - page 38
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. 1. Disconnect the brewer from the power ...
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Bunn Dual TF - page 39
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 WHI wire to TL2 (120V Two Pole, 120/208V or 120/240V Three Pole Terminal Block) RED RED wire to TL2 (200V or 240V Two Pole Terminal Block) WHI/RED WH ...
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Bunn Dual TF - page 40
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.O. K3 N.O. RED DUAL-TF BREWER W/SERVER SENSOR & TWO-GRINDER ...
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Bunn Dual TF - page 41
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.O. K3 N.O. RED DUAL-ATF OR BTF BREWER W/SERVER SENSOR & TWO-GRINDER INTERFACE BLU BLK L1 ...
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Bunn Dual TF - page 42
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. GRY TAN PNK GRINDER INTERFACE CONNECTOR YEL FRACTIONAL BATCHES (CONNECT AS REQUIRED) FULL BATCH (NO CONNECTION) TAN GRY PNK 1/4 BATCH 1/3 BATCH 1/2 BATCH 2/3 BATCH 3/ ...
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Bunn Dual TF - page 43
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. GRY TAN PNK GRINDER INTERFACE CONNECTOR YEL FRACTIONAL BATCHES (CONNECT AS REQUIRED) FULL BATCH (NO CONNECTION) TAN GRY PNK 1/4 BATCH 1/3 BATCH 1/2 BATCH 2/3 BATCH 3/4 BATCH BATCH CO ...
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Bunn Dual TF - page 44
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 ...
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Bunn Dual TF - page 45
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. YEL FRACTIONAL BATCHES (CONNECT AS REQUIRED) FULL BATCH (NO CONNECTION) TAN GRY PNK 1/4 BATCH 1/3 BATCH 1/2 BATCH 2/3 BATCH 3/4 BATCH BATCH COMMON R T S E L E C T O R ...
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Bunn Dual TF - page 46
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.O. K3 N.O. RED DUAL-ATF OR BTF BREWER W/SERVER SENSOR & ONE-GRINDER INTERFACE BLU BLK L1 ...
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Bunn Dual TF - page 47
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. YEL FRACTIONAL BATCHES (CONNECT AS REQUIRED) FULL BATCH (NO CONNECTION) TAN GRY PNK 1/4 BATCH 1/3 BATCH 1/2 BATCH 2/3 BATCH 3/4 BATCH BATCH COMMON R T S E L E C T O R S W WHI/VIO WHI ...
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