Bunn DUAL TM (Serial # DUAL010000 - Up) User Manual

BUNN-O-MATIC CORPORATIONPOST OFFICE BOX 3227SPRINGFIELD, ILLINOIS 62708-3227PHONE: (217) 529-6601 FAX: (217) 529-6644www.bunnomatic.comOPERATING &a

Page 10TROUBLESHOOTING (cont.)ProblemWater from tank is not hot (cont.).Server warmer is not hot.Spitting or unusual steaming fromsprayhead or airvent

Page 11TROUBLESHOOTING (cont.)ProblemInconsistent beverage level inserver (cont.).Consistently high or low beveragelevel in server.Dripping from spray

Page 12TROUBLESHOOTING (cont.)ProblemWeak beverage (cont.)Brewer is making unusual noises.Probable Cause3. Sprayhead4. Funnel loading5. Water temperat

Page 13SERVICEThis section provides procedures for testing andreplacing various major components used in thisbrewer should service become necess

Page 14SERVICE (cont.)BYPASS VALVELocation:The bypass valves are located inside the right frontand the center front of the hood.Test Procedures:1. Dis

Page 15SERVICE (cont.)BREW SELECTOR SWITCHLocation:The brew selector switches are located in the frontleft and right side of the hood.Test Procedure:1

Page 16SERVICE (cont.)P77627040 032201To Left or Right TimerTANGRYPNKWHI/VIO to Left or Right By-Pass ValveWHI/RED to Left or Right Dispense ValveGRY

Page 17SERVICE (cont.)CONTACTOR ASSEMBLYLocation:The contactor assembly is located inside the hoodjust to the rear of the right dispense valve.Test Pr

Page 18SERVICE (cont.)CONTACTOR ASSEMBLY (cont.)P77827040 032201Test Procedures : Electronic Control (Brewers w/Recovery Booster)1. Disconnect the bre

Page 19b.) 200 to 240 volts ac for two wire 200 or 240 voltmodels.4. Disconnect the brewer from the power source.If voltage is present as described, p

Page 2INTRODUCTIONThis equipment will brew two half-gallon, gallon, or gallon and a half batches of coffee into awaiting serversat the push of a butto

Page 20P780SERVICE (cont.)27040 032201Removal and Replacement:1. Remove wires from the control thermostat.2. Remove the thermostat capillary bulb by

Page 21.MINUTESBUNN-O-MATICP/N 2620- 120 VAC.MINUTESBUNN-O-MATICP/N 2620- 120 VAC

Page 22SERVICE (cont.)Location:The electronic control assembly (1) is locatedinside the lower left front on the component bracket ofthe brewer.

Page 23SERVICE (cont.)PROBLEM:LIQUID LEVEL CONTROL SYSTEM DOES NOT REFILLPROBLEM:LIQUID LEVEL CONTROL OVERFLOWSRETRYNOYESYESNOYESREPLACE CONTROL ASSEM

Page 24YESYESYESYESNONONONOYESNONOMEASURE VOLTAGEAT TANK HEATER (5)VOLTAGE PRESENTREPLACE TANKHEATER (5)LIMIT THERMOSTAT (6)OK?REPLACE LIMITTHERMOSTAT

Page 25SERVICE (cont.)ELECTRONIC CONTROLS (cont.)PROBLEM:WATER BOILSYESNONONONOREPLACE CONTROLASSEMBLY (1)REPLACE TRIAC (17) CHECK FOR SPLITTANK

Page 26SERVICE (cont.)ELECTRONIC CONTROL ASSEMBLY (cont.)ONCAUTION!Failure To Comply Voids Warranty!Hot Water Systems – Water Tank Will FillAutomatica

Page 27P787SERVICE (cont.)ELECTRONIC CONTROL ASSEMBLY (cont.)11. Install new triac/heat sink assembly on right tankmounting bracket.12. Route the wire

Page 28

Page 29SERVICE (cont.)LEVEL CONTROL BOARD AND LEVEL PROBE (Electro/mechanical only) (cont.)15. Move the probe's flat end to the brewer housing.Th

Page 3Requires 2-wire, groundedservice rated 200 to 240volts ac, 30 amp, singlephase 50 or 60 Hz.Requires 3-wire, groundedservice rated 120/208 or 120

Page 30SERVICE (cont.)If voltage is present as described, reconnect the blackwire to the limit thermostat from the terminal block,the limit thermostat

Page 31SERVICE (cont.)Location:The ON/OFF switches are located on the front ofthe hood just to the left and right of the start switches.Test Procedure

Page 32Location:The overflow protection switch is located insidethe hood on the center of the tank inside the copperoverflow cup.To test the overflow

Page 33!CAUTIONHOT WATER.MINUTESBUNN-O-MATICP/N 2620- 120 VAC.MINUTESBUNN-O-MATICP/N 2620- 120 VACSTART ON / WARMERSELECTORREADYREADYON / WARMERST

Page 34REDBLK to BLK Lead on Contactor CoilBLK to BLK Lead on ThermostatWHI/RED to Left Dispense Valve WHI/BRN to Left Dispense ValveWHI/GRN to Right

Page 35SERVICE (cont.)SOLENOID VALVE (Inlet)!CAUTIONHOT WATER.MINUTESBUNN-O-MATICP/N 2620- 120 VAC.MINUTESBUNN-O-MATICP/N 2620- 120 VACSTARTREADYO

Page 36STARTON / WARMERSELECTORREADYREADYON / WARMERSTART1 1⁄2 gal1 gal1⁄2 galSELECTOR1 1⁄2 gal1 gal1⁄2 galP792START SWITCHESLocation:The momentary st

Page 37tank heater(s).NOTE - If the tank heater remains unable to heat,remove and inspect the heater for cracks in the sheath.Electronic Mode

Page 38Location:The timers are located inside the left front of thebrewer on the upper part of the component bracket.Test Procedures:1. Disconnect the

Page 39.MINUTESBUNN-O-MATICP/N 2620- 120 VAC.MINUTESBUNN-O-MATICP/N 2620- 120 VACWHI/VIO TL1 to Right ON/OFF Switch WHI/VIO TL1 to Right Warmer El

Page 4CAUTION – Improper electrical installation will damage electronic components.1. An electrician must provide electrical service as specified.2. U

Page 40SERVICE (cont.)Timers (Early Models)(cont.)P847.MINUTESBUNN-O-MATICP/N 2620- 120 VAC.MINUTESBUNN-O-MATICP/N 2620- 120 VACWHI/VIO TL1 to Rig

Page 4127040 032201SERVICE (cont.)TIMERS (Late Models)P2194Location:The timers are located inside the left front of thebrewer on the upper part of the

Page 4227040 032201P2037SERVICE (cont.)TIMERS (Late Models)(cont.)LEFT TIMER RIGHT TIMERYEL WHI/YEL wire to TL5WHI/BRN WHI/GRN wire to TL4ORA WHI/ORA

Page 43SERVICE (cont.)WARMER ELEMENTSWHI/VIO to Right Timer TL1WHI to Terminal Block (White Insert onThree Pole Terminal Blocks or Red Insert on Two P

Page 44120/208 VOLTS AC OR120/240 VOLTS AC3 WIRERTSELECTORSWVIOPROBEPIN-201432LIQUIDLEVELBOARDBLUBLKK1WHILIMIT THERMOSTATSOLWHIWHIOVERFLOWPROTECTION S

Page 45RTSELECTORSWVIOPROBEPIN-201432LIQUIDLEVELBOARDBLUK1REDSOLREDREDSW. & THERMOSTATREADY INDICATORSOPTIONALRECOVERY BOOSTERBLKBLUK2 N.O. K3 N.O

Page 46BLK-12BLU-12SCHEMATIC WIRING DIAGRAM DUAL BREWER ECA(W/TWO-GRINDER INTERFACE)RTSELECTORSWWHIWHI/ORAWHI/VIOWHI/GRNWHI/YELWHIWHI/REDWHI/GRNL1NTAN

Page 47SCHEMATIC WIRING DIAGRAM DUAL-A & -B BREWER ECA(W/TWO-GRINDER INTERFACE)RTSELECTORSWREDWHI/ORAWHI/VIOWHI/GRNWHI/YELREDWHI/REDWHI/GRNL1GRN/Y

Page 48120/208 VOLTS AC OR120/240 VOLTS AC3 WIRERTSELECTORSWVIOPROBEPIN-201432LIQUIDLEVELBOARDBLUBLKK1WHILIMIT THERMOSTATSOLWHIWHIOVERFLOWPROTECTION S

Page 49BLK-12BLU-12SCHEMATIC WIRING DIAGRAM DUAL BREWER ECA(W/ONE-GRINDER INTERFACE)RTSELECTORSWWHIWHI/ORAWHI/VIOWHI/GRNWHI/YELWHIWHI/REDWHI/GRNL1NTAN

Page 527040 032201Models with electro/mechanical thermostats:Rotate the control thermostat knob fully clockwise to the “ON” position and replace the f

Page 50RTSELECTORSWVIOPROBEPIN-201432LIQUIDLEVELBOARDBLUK1REDSOLREDREDSW. & THERMOSTATREADY INDICATORSOPTIONALRECOVERY BOOSTERBLKBLUK2 N.O. K3 N.O

Page 51SCHEMATIC WIRING DIAGRAM DUAL-A & -B BREWER ECA(W/ONE-GRINDER INTERFACE)RTSELECTORSWREDWHI/ORAWHI/VIOWHI/GRNWHI/YELREDWHI/REDWHI/GRNL1GRN/Y

Page 52WHI/GRNWHI/GRNWHI/REDWHI/REDRT START SWBLK BLKLT START SWBLKGRNBLKYELBLKREDBLKPNKTANGRYWHIWHIREDREDGRYPNKPNKREDWHIPNKREDORAYELVIOBLUWHI/REDWHI/

Page 627040 032201OPERATING CONTROLSBREW SELECTOR SWITCH (Triple - set timer models only)Placing the switch in the 1⁄2 Gal, 1 Gal, or 11⁄2 Gal positio

Page 7TROUBLESHOOTINGA troubleshooting guide is provided to suggest probable causes and remedies for the most likely problemsencountered. If the prob

Page 8TROUBLESHOOTING (cont.)ProblemBrew cycle will not start (cont.)Automatic refill will not operateRemedyRefer to Service - ON/OFF switch fortestin

Page 9TROUBLESHOOTING (cont.)ProblemBeverage level will not adjust(Selector switch in any position)Water flows into tank continuously.Water flows into