Bunn CDBC, Operating & Service Manual

Page 1: ...FUN NE L CO NTE NTS AR E HO T CA UT IO N DIS CA RD DE CA NTE R IF CRA CKE D SCR ATC HED BOI LED DRY HEA TED WHE N EMP TY USE D ON HIG H FLA ME OR EXP OSE D ELE CTR IC ELE MEN TS FAI LUR E TO CO MP LY...

Page 2: ...y claim to be made under this warranty by telephone at 217 529 6601 or by writing to Post Office Box 3227 Springfield Illinois 62708 3227 2 if requested by BUNN shipping the defective equipment prepai...

Page 3: ...00656 0000 00658 0000 12364 0000 10044 0000 WARNING DO NOT OVERLOAD CIRCUIT ALWAYS ELECTRICALLY GROUND THE CHASSIS OR ADAPTOR PLUG DO NOT DEFORM PLUG OR CORD FOLLOW NATIONAL AND LOCAL ELECTRICAL CODE...

Page 4: ...stall a regulator in the line when pressure is greater than 90 psi 620 kPa to reduce it to 50 psi 345 kPa The water inlet fitting is 3 8 flare Bunn O Matic does not recommend the use of a reverse osmo...

Page 5: ...te and complete a brew cycle ADDITIONAL WARMER SWITCHES Placing any additional warmer switch in the ON upper position supplies power to the associated warmer READY INDICATOR This indicator glows when...

Page 6: ...ethandle Releaseitwhenyouhearwateronceagainflowing into the tank 8 Model CDBC With the ON OFF switch still in the ON position indicator glowing momentarily press and release the BREW switch Model CEZ...

Page 7: ...erisnowsettodispensethisamount of water for each subsequent brew cycle To increase the amount of water for each brew cycle place an empty funnel in the funnel rails and an empty decanter or graduated...

Page 8: ...isfactorysetwiththebrewlockoutdisabled Brewlockoutpreventsstartingabrewcycleiftheready indicator is not glowing When an attempt at brewing cannot be allowed the word NOT and LOCKOUT flash for three se...

Page 9: ...lease the BREW switch once for each ounce approximate of water to be added to the prior setting and allow the brew cycle to finish To decrease the amount of water for each brew cycle place an empty fu...

Page 10: ...emory The spray will continue the off and on cyclesuntilthebrewvolumeofstep1iscomplete PressingtheOFF ONbuttonagainwillterminatethebrewing cycle with the parameters stored in memory 7 If only a preinf...

Page 11: ...notices Before troubleshooting this brewer check for the following A Control Boards CDBC TWIN 1 Make sure ribbon cable is properly attached to the control board ALL PINS INSERTED INTO PLUG 2 Makesure...

Page 12: ...check for lime deposit on tip Clean and rein stall Disconnect the brewer from the power source and remove wires from refill valve coil Check for con tinuity across the terminals of the solenoid coil I...

Page 13: ...ctor from the control board Check for continuity from the nut on top of the level probe to pin 5 of the plug continuity should be present Pullthetemperatureprobe up about an inch from the grom met Che...

Page 14: ...e up about an inch from the grommet Check for continuity from the outside surface of the temperature probe and pin 4 of the plug continuity should be present Connect the J3 plug to the control board a...

Page 15: ...probe from the grommetandsubmergeinawater bathofapproximately70 F 21 C Connect an ohmmeter to pins 2 and 3 of the J5 connector At 60 F 16 C the reading should be 15 3k 2k OHMS at 70 F 21 C the readin...

Page 16: ...board B Remove the probe from the grommetandsubmergeinawater bathofapproximately70 F 21 C Connect an ohmmeter to pins 2 and 3 of the J5 connector At 60 F 16 C the reading should be 15 3k 2k OHMS at 7...

Page 17: ...ss the black and white terminals at the termi nal block The indicator lamp must be lit Allow brewer to heat until ready lamp is lit or disable the brew lockout feature See page 7 or 8 Press ON OFF swi...

Page 18: ...inuity across the terminals of the sole noid coil If continuity is not present replace the solenoid See page 27 If continuity is present the valve may be stuck closed Set up brewer according to in str...

Page 19: ...for proper ex traction Place an empty brew funnel on an empty decanter beneath the sprayhead Initiate brew cycle and check the water temperature im mediately below the sprayhead with a thermometer The...

Page 20: ...t the brewer from the powersource Removethewarmer plate and turn upside down to ex pose the warmer terminals Re move the two wires Check for continuity across the two warmer terminals If continuity is...

Page 21: ...pressure is water shut off Level probe dry for 7 minutes after fill valve is energized Shorting pin on J6 connector of control board not on correct set of pins CEZ boards only See page 7 Level probe w...

Page 22: ...sistance 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 unplugged w...

Page 23: ...and Replacement 1 Disconnect the black wire and blue wire from the relay on the control board 2 Disconnect the 10 pin connector and the 4 pin connector from the main wiring harness 3 Disconnect the 1...

Page 24: ...Remove the four 6 32 screws securing the con trol board to the component mounting bracket 5 Remove the four spacers from the control board and attach them to the new board 6 Locate J6 connector on con...

Page 25: ...CH PANELS CDBC Removal and Replacement 1 Disconnect the 11 pin connector to the switch panel from the control board 2 Remove the four 6 screws nylon washers and the two 4 screws securing the control b...

Page 26: ...described refer to the Wiring Diagrams and check the brewer wiring har ness 5 With the black wire removed remove the wire from the lower terminal 6 Check for continuity across the center and lower ter...

Page 27: ...Check for continuity across the two terminals on the switch when it is held in the lower position Continuity must not be present across these ter minals when the switch is released P1851 P1849 FIG 7 B...

Page 28: ...or wear and remove waterborne particles If the sound is not heard as described proceed to 6 P1877 P1853 WHI GRN from PC Control Board WHI from Terminal Block FIG 10 DISPENSE VALVE WIRING FIG 9 DISPENS...

Page 29: ...el on the front side of the tanks Test Procedures 1 Disconnect the brewer from the power source 2 Disconnect the blue and black wires from the limit thermostat 3 Withanohmmeter checkforcontinuityacros...

Page 30: ...hose from the top of the tank by pulling the elbow fitting from the grommet in the top of the tank lid 3 Drain water from the tank 4 Disconnect the water supply tube to the dispense valve from the si...

Page 31: ...the grom met in the tank lid 24 Install the elbow fitting of the vent hose into the grommet in the tank lid 25 If installing left tank on brewers with faucet connect the outlet water line of the fauce...

Page 32: ...continuity is not present as described replace the refill valve 6 Check the refill valve for coil action Connect the brewer to the power source With ON OFF switch in the ON upper position press start...

Page 33: ...4 Disconnect the brewer from the power source If voltage is present as described proceed to 5 If voltage is not present as described refer to Wiring Diagrams and check brewer wiring harness 5 Check th...

Page 34: ...YEL WHI YEL WHI ORA WHI ORA PNK WHI GRN COUNTER OPTIONAL PNK GRY t BLK BLK 14 WHI 120 208V AC 3 WIRE 120 240V AC 3 WIRE SINGLE PHASE P1 P2 P3 ARE PINS OF A POLARIZED THREE PIN CONNECTOR WHI SOL WHI W...

Page 35: ...IRE SINGLE PHASE 120 208V AC 3 WIRE 120 240V AC 3 WIRE SINGLE PHASE YEL WHI VIO WHI VIO WHI VIO BLK WHI YEL YEL W H I LEFT CONTROL PANEL ASSY J2 1 J2 6 J2 11 BREW SW STATIC SHIELD ON OFF SW HIDDEN SW...

Page 36: ...OPTIONAL 120 208V AC 3 WIRE 120 240V AC 3 WIRE SINGLE PHASE 120 208V AC 3 WIRE 120 240V AC 3 WIRE SINGLE PHASE VIO VIO BLK WHI LEFT CONTROL PANEL ASSY J2 1 J2 6 J2 11 BREW SW STATIC SHIELD ON OFF SW...