BUNN ® ! ER N IO CANT UT D DE CA DISCAR IF: Y D PT KE D ACTCHEY EMAMEIC FL . CRRA D DR EN H ECTR . SC ILEED WH HIG EL . BOAT ONSED . HEED PO . US EXENTS OR . EM RY EL JU ON ION AT ATI TS S IN OR RP EN SK CO NT Y RI MATIC CO T -OMPL EL HO NN CO NN E 5 BU 198 FU AR E TO ILUR FA : 658 PN OPERATING & SERVICE MANUAL BUNN-O-MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD, ILLINOIS 62708-3227 PHONE: (217) 529-6601 FAX: (217) 529-6644 www.bunnomatic.
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).
ER N IO CANT UT RD DE ! CA CA DIS IF: D 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 . BOATE AT D ED . HE ONSE ED PO OS Y . US EXP EX S UR N NT NTS INJ .
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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.
CIRCUIT BREAKERS Page 18
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.
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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.
GRINDER SELECTOR SWITCH ER N IO CANT UT RD DE ! CA CA DIS D IF: ED KE ED CK TY AC PTY CH Y RA MP EM . CRRATCH ME DR EN . SC ILED WH H FLA IC CTR D . BOATE HIG ELE . HE ON ED ED OS Y . US EXP UR N NTS 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 FIG.
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.
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SERVICE (cont.
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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.
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FIG.
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