BUNN DUAL™ SH ® DBC W/ FUNNEL LOCKS, FUNNEL SENSOR & SERVER DETECT W A R N IN G CE UR OR SO NEL ENT! N WER PA PO PO ANY OM ! OM L OF Y C T FROVA F AN O EC NN REM T CO RE EMEN DIS FO LAC BE EP R ! N IO ER NT CA DE D AR SC DI Y IF: KED D PT ACTCHEY EMAMEIC UT CA FL . CRRA D DR EN H ECTR . SC ILEED WH HIG EL . BOAT ONSED . HEED PO . US EXENTS .
WARRANTY Bunn-O-Matic Corp. (“Bunn”) warrants the equipment manufactured by it to be commercially free from defects in material and workmanship existing at the time of manufacture and appearing within one year from the date of installation. In addition: 1.) Bunn warrants electronic circuit and/or control boards to be commercially free from defects in material and workmanship for two years from the date of installation. 2.
INTRODUCTION This brewer utilizes BUNN® DBC™ technology to control most of its functions. The controller is factory set to brew in accordance with accepted coffee industry standards, yet may be customized by the owner to achieve a variety of coffee flavor profiles. All user-accessible features of the controller are viewed and entered using the display unit, an internal box permanently attached to the brewer.
ELECTRICAL REQUIREMENTS CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up. Requires 3-wire, grounded service rated 120/208 or 120/240 volts ac, 30 amp, single phase, 60 Hz. 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.
INITIAL SET-UP CAUTION – The brewer must be disconnected from the power source throughout the initial set-up, except when specified in the instructions. 1. Insert an empty funnel into the funnel rails of one of the brew stations. 2. Place an empty server under the funnel. 3. Connect the brewer to the power source. Water will begin flowing into the tank and stop when the tank is filled to its capacity. Display will show FAULT 7 until tank is filled with water. 4.
DBC CONTROLLER General This brewer utilizes BUNN® DBC™ technology to control most of its functions. The controller is factory set to brew in accordance with accepted coffee industry standards, yet may be customized by the owner to achieve a variety of coffee flavor profiles. All user-accessible features of the controller are viewed and entered using the display unit. The brewer operating settings are stored in the controller and will remain even in the event of power failure.
Setting or adjusting the brewer’s controls Refer to the function list for the accessible screen numbers and their values. Scroll to the desired function screen and change the value by pressing either the “+” or “–“ keys. The change will not be entered into the programming until you move to another screen by scrolling either up-or-down with the “FUNC” key. Setting or adjusting the tank’s water temperature At the home screen, the actual temperature of the water in the tank is displayed.
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. • • • • • • • WARNING • • • • Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel. All electronic components have 120 - 240 volt ac and low voltage dc potential on their terminals.
TROUBLESHOOTING (cont.) Problem Brew cycle will not start (cont.) Automatic refill will not operate Probable Cause 4. Start switch Remedy Refer to Service - Start switch for testing procedures. See page 30 5. Dispense valve Refer to Service - Dispense valve for testing procedures. See page 20 6. Brew selector switch Refer to Service - Brew selector switch for testing procedures. See page 16 7. Defective DBC Refer to Service - DBC Controller for testing procedures. See page 19 1.
TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Water flows into tank continuously . 1. Solenoid valve Refer to Service - Solenoid valve for testing procedures. See page 29 2. Defective DBC Refer to Service - DBC Controller for testing procedures. See page 19 3. Overflow protection switch Refer to Service - Overflow protection switch for testing procedures. See page 26 1. Limit thermostat CAUTION - Do not eliminate or bypass limit thermostat. Use only B.O.M. part #23717.
TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Spitting or unusual steaming from sprayhead or airvents. 1. Lime build-up Inspect the tank assembly for excessive lime deposits. Delime as required. CAUTION - Tank and tank components should be delimed regularly depending on local water conditions. Excessive mineral build-up on stainless steel surfaces can initiate corrosive reactions resulting in serious leaks. Inconsistent beverage level in server. 1.
TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Water overflows filter (cont.) 2. Type of paper filters BUNN® paper filters should be used for proper extraction. 3. No sprayhead Check sprayhead 1. Beverage left in server The brew cycle should be started only with an empty server under the funnel. 2. Volume adjustment needed Refer to Setting or Adjusting Batch Volumes, page 7 3. Dispense valve Refer to Service - Dispense valve for testing procedures. See page 20 1.
TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Brewer is making unusual noises. 1. Solenoid valve The nut on back of the solenoid must be tight or it will vibrate during operation 2. Plumbing lines Plumbing lines should not be resting on the counter top. 3. Water supply (A) The brewer must be connected to a cold water line. (B) Water pressure to the brewer must not be higher than 90 psi (620 kPa).
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. The brewer should be unplugged when servicing, except when electrical tests are required and the test procedure specifically states to plug in the brewer.
SERVICE (cont.) 6. Connect the voltmeter lead ends to the bypass valve coil terminals. Connect the brewer to the power source. With the selector switch in the 1.5 or 1.75 gallon position, place "ON/OFF" Switch in the "ON" position. Press and release the brew switch. The indication must be 120 volts ac for three wire 120/208 volt models and three wire 120/240 volt models. BYPASS SOLENOID VALVE 7. Disconnect the brewer from the power source.
SERVICE (cont.) BREW SELECTOR SWITCH Grinder Interface: Left or Right: 7. Disconnect the gray and tan wires on the selector switch from the gray and tan wires on the interface socket. 8. Disconnect the pink wire on the selector switch from the grinder switch. 9. Check for continuity across the pink wire and tan wire on the selector switch when the switch is in the 1/2 gallon position. Continuity must not be present in any other position. 10.
SERVICE (cont.) BREW SELECTOR SWITCH (cont.) Removal and Replacement: 1. Disconnect the connector on the selector switch harness from the DBC controller. 2. Disconnect wires from the selector switch, interface socket and dispense valve. 3. Loosen the set screw on the switch knob. 4. Remove the 9/16" nut and washer holding the switch to the hood. 5. Remove the switch. 6. Install the new switch. The positioning tab must be in the hole in the hood for proper switch and knob alignment. 7.
SERVICE (cont.) CIRCUIT BREAKERS Removal and Replacement: 1. Remove the wires from the circuit breaker. 2. Compress the clips on the back side of the server platform and gently push the circuit breaker through the opening in the server platform. 3. Push the new circuit breaker into the opening in the server platform until the clips snap into position. 4. Reconnect the wires to the circuit breaker. 5. Refer to Fig. 7 when reconnecting the wires.
SERVICE (cont.) DBC DISPLAY G D B IS ! R EF CO E O N P R N LA E E C R CT E E M M F E O RO N V T A M O L P F O O A F W N A E Y N R C Y S O PA O M N U P E R O L C N O E E R N T! R WA NIN N IO UT ! CA RD CA DIS D IF: ER NT CA DE KE D AC HE PTY . CRRATCDRY EM ME EN . SC ILED WH H FLA RIC CT . BOATED HIG ELE D . HE ONSE ED PO Y . US EX S UR N NT INJ . OR ME ATIO TS POR ELE KS EN COR RIS NT TIC LY CO T -MA N-O MP EL HO BUN CO NN E 1985 FU AR TO RE ILU FA 658 PN: R TE T WA HO ! FIG.
If continuity is present as described, reconnect the wires to the dispense valve(s) and proceed to #7 If continuity is not present as described, replace the dispense valve. SERVICE (cont.) DISPENSE SOLENOID VALVES 7. Check the dispense valve for coil action. Connect the brewer to power source. Place the ON/OFF" switch in the "ON" position, press and release the start switch. Listen carefully in the vicinity of the dispense valve for a "clicking" sound as the coil magnet attracts and repels the plunger. 8.
SERVICE (cont.) FUNNEL SENSOR SWITCH Removal and Replacement: 1. Remove the two wires from the switch. 2. Remove the two #4-40 screws securing the switch to the switch bracket and remove the switch. 3. Install the new switch to the bracket and secure with two #4-40 screws. 4. Refer to Fig. 13 when reconnecting wires. BLK to DBC Controller J3-8 FIG. 12 FUNNEL SENSOR SWITCH P2232 Location: The Funnel Sensor switches are located inside the hood and to the right of each dispense valve.
SERVICE (cont.) FUNNEL LOCK SOLENOID FIG. 14 FUNNEL LOCK SOLENOID P2232 Location: The Funnel Lock Solenoids are located inside the hood and to the front right of each dispense valve. Test Procedures: 1. Disconnect the dispenser from the power source.
SERVICE (cont.) GRINDER INTERFACE CIRCUIT BOARD P2232 FIG. 16 GRINDER INTERFACE CIRCUIT BOARD Location: The Grinder Interface Circuit Board is located inside the trunk housing on a bracket just below the Tank Assy. Test Procedures: 1. Disconnect the dispenser from the power source.
SERVICE (cont.) GRINDER SELECTOR SWITCH 7. Place the selector switch in the right position. 8. Check for continuity across the center and left terminals on the rear of the switch. 9. Continuity must not be present across the center and right terminals on the rear of the switch. 10. Check the bottom row, then the top row.
SERVICE (cont.) LIMIT THERMOSTAT Removal and Replacement: 1. Remove all wires from the limit thermostat terminals. 2. Carefully remove the two #8-32 nuts securing the limit thermostat to tank lid and remove limit thermostat. 3. Carefully secure new limit thermostat to tank lid. 4. Refer to Fig. 21 when reconnecting the wires. FIG.
SERVICE (cont.) Removal and Replacement: 1. Disconnect the red leads from the overflow protection switch at the wire nuts. 2. Remove the nut beneath the copper overflow cup. 3. Remove the entire switch assembly from the cup. 4. Place the new switch assembly into the cup, wires first. Make sure that the gasket is in place around the threaded switch stem. NOTE - The magnets must be at the top of float and there must be NO adjusting washers installed for the overflow protection switch to operate properly. 5.
SERVICE (cont.) RECEPTACLE ASSEMBLIES BLK to (-) Terminal on Right Rectifier RED to (+) Terminal on Right Rectifier G D B IS ! R EF CO E O N P R N LA E E C R CT E E M M F E O RO N V T A M O L P F O O A F W N A E Y N R C Y S O PA O M N U P E R O L C N O E E R N T! WA IN RN RIGHT BLK to (-) Terminal on Left Rectifier RED to (+) Terminal on Left Rectifier N IO UT ! CA RD CA DIS D IF: ER NT CA DE D KE ED AC HE PTY TC Y EM . CRRATCH ME DR EN IC . SC ILED WH H FLA RIC CT CTR D ED HIG ELE .
Removal and Replacement: 1 Disconnect the wires from the rectifier. 2. Remove the #6-32 truss head screw securing the rectifier to the brew base plate. 3. Remove the rectifier and discard. 4. Install new rectifier on base plate and secure with a #6-32 truss head screw. 5. Refer to Fig. 27 & 28 when reconnecting the wires. SERVICE (cont.
SERVICE (cont.) 6. Check the solenoid valve for coil action. Connect the brewer to the power source. Listen carefully in the vicinity of the solenoid valve for a "clicking" sound after approximately 1 second, as the coil magnet attracts. 7. Disconnect the brewer from the power source.
SERVICE (cont.) START/STOP SWITCHES Removal and Replacement: 1. Remove all wires from the switch terminals. 2. Compress the clips inside the hood and gently push the switch through the opening. 3. Push the new switch into the opening and spread the clips to hold the switch in the hood. 4. Refer to Fig. 32 when reconnecting the wires.
If continuity is present as described, reconnect the 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. SERVICE (cont.) TANK HEATERS Removal and Replacement: 1. Remove wires from tank heater. 2. Remove the four #8-32 nuts securing tank heater to tank lid. 3. Remove tank heater and gasket. 4.
SERVICE (cont.) TRANSFORMERS 5. Disconnect the blue/black wires from terminals #7 and #12 on the transformer. 6. With a voltmeter check the voltage across the blue/ black wires. Connect the brewer to the power source. The indication must be 24 volts ac. If voltage is present as described the transformer is operating properly. If voltage is not present as described, replace the transformer. Removal and Replacement: 1. Disconnect all the wires from the transformer that is to be replaced. 2.
SERVICE (cont.) TRANSFORMERS (cont.) FIG.
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