Bunn DUAL SH Operating & Service Manual
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Bunn DUAL SH Operating & Service Manual

Bunn DUAL SH Operating & Service Manual

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BUNN
DISCONTINUED VERSION
The information in this manual
OPERATING & SERVICE MANUAL
32248.0000B 3/01 ©2000 Bunn-O-Matic Corporation
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BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
®
DUAL
DBC W/ FUNNEL LOCKS, FUNNEL
SENSOR & SERVER DETECT
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www.bunnomatic.com

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  • Page 1 R IS IL U : 65 The information in this manual is no longer current OPERATING & SERVICE MANUAL BUNN-O-MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD, ILLINOIS 62708-3227 PHONE: (217) 529-6601 FAX: (217) 529-6644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.com 32248.0000B 3/01 ©2000 Bunn-O-Matic Corporation...
  • Page 2 The Buyer shall give Bunn prompt notice of any 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. If requested by Bunn, the Buyer shall ship the defective equipment prepaid to an authorized Bunn service location.
  • Page 3 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.
  • Page 4 " water supply line. A tight coil of copper tubing in the water line will facilitate moving the brewer to clean the counter top. Bunn-O-Matic does not recommend the use of a saddle valve to install the brewer. The size and shape of the hole made in the supply line by this type of device may restrict water flow.
  • Page 5 1. Select the desired batch size. ® 2. Insert a BUNN filter into the funnel. 3. Pour the proper amount of fresh ground coffee into the filter and level the bed of grounds by gently shaking. 4. Slide the funnel into the funnel rails.
  • Page 6 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.
  • Page 7 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”...
  • Page 8 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 qualified service personnel.
  • Page 9 TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Brew cycle will not start (cont.) 4. Start switch Refer to Service - Start switch for testing procedures. See page 30 Refer to Service - Dispense valve for 5. Dispense valve testing procedures. See page 20 6.
  • Page 10 TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Refer to Service - Solenoid valve for Water flows into tank continuously 1. Solenoid valve testing procedures. See page 29 2. Defective DBC Refer to Service - DBC Controller for testing procedures. See page 19 3.
  • Page 11 TROUBLESHOOTING (cont.) Probable Cause Problem Remedy Spitting or unusual steaming from 1. Lime build-up Inspect the tank assembly for ex- sprayhead or airvents. cessive lime deposits. Delime as re- CAUTION - Tank and tank compo- quired. nents should be delimed regularly depending on local water conditions.
  • Page 12 B.O.M. Sprayhead #01082.0002 should be used to properly wet the bed of ground coffee in the funnel. ® 4. Funnel loading The BUNN paper filter should be centered in the funnel and the bed of ground coffee leveled by gentle shak- ing.
  • Page 13 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 rest- ing on the counter top. 3.

  • Page 14: Table Of Contents

    SERVICE The top cover is attached with four #4-40 slotted head screws. This section provides procedures for testing and The front inspection panel is attached with eleven replacing various major components used in this #6-32 slotted head screws. brewer should service become necessary. Refer to Troubleshooting for assistance in determining the The server platform is attached with four #6-32 cause of any problem.

  • Page 15: Bypass Solenoid Valves

    SERVICE (cont.) 6. Connect the voltmeter lead ends to the bypass BYPASS SOLENOID VALVE 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.

  • Page 16: Brew Selector Switches

    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.
  • Page 17 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, inter- face socket and dispense valve. 3. Loosen the set screw on the switch knob. 4.

  • Page 18: Circuit Breakers

    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.

  • Page 19: Dbc Display

    SERVICE (cont.) DBC DISPLAY N TE N TE D IS D IS IF : IF : . CR . CR . SC . SC IL ED IL ED W HE W HE . BO . BO . HE . HE .

  • Page 20: Dispense Solenoid Valves

    If continuity is present as described, reconnect the SERVICE (cont.) wires to the dispense valve(s) and proceed to #7 DISPENSE SOLENOID VALVES If continuity is not present as described, replace the dispense valve. 7. Check the dispense valve for coil action. Connect the brewer to power source.

  • Page 21: Funnel Sensor Switch

    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.

  • Page 22: Funnel Lock Solenoid

    SERVICE (cont.) FUNNEL LOCK SOLENOID P2232 FIG. 14 FUNNEL LOCK SOLENOID 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. Removal and Replacement: Page 22 32248 100500...

  • Page 23: Grinder Interface Circuit Board

    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. Removal and Replacement: Page 23 32248 100500...

  • Page 24: Grinder Selector Switch

    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.

  • Page 25: Limit Thermostat

    SERVICE (cont.) LIMIT THERMOSTAT Removal and Replacement: 1. Remove all wires from the limit thermostat termi- nals. 2. Carefully remove the two #8-32 nuts securing the limit thermostat to tank lid and remove limit ther- mostat. 3. Carefully secure new limit thermostat to tank lid. 4.

  • Page 26: Overflow Protection Switch

    SERVICE (cont.) Removal and Replacement: 1. Disconnect the red leads from the overflow pro- OVERFLOW PROTECTION SWITCH tection switch at the wire nuts. 2. Remove the nut beneath the copper overflow cup. 3. Remove the entire switch assembly from the cup. 4.

  • Page 27: Receptacles (Spring Contacts)

    SERVICE (cont.) BLK to (-) Terminal on Right Rectifier RECEPTACLE ASSEMBLIES RED to (+) Terminal on Right Rectifier RIGHT BLK to (-) Terminal on Left Rectifier RED to (+) Terminal on Left Rectifier N TE N TE D IS D IS IF : IF : .

  • Page 28: Rectifiers

    Removal and Replacement: SERVICE (cont.) 1 Disconnect the wires from the rectifier. RECTIFIERS 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.

  • Page 29: Refill Solenoid Valve

    SERVICE (cont.) 6. Check the solenoid valve for coil action. Connect the brewer to the power source. Listen carefully in REFILL SOLENOID VALVE the vicinity of the solenoid valve for a "clicking" sound after approximately 1 second, as the coil magnet attracts.

  • Page 30: Start/Stop Switches

    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.

  • Page 31: Tank Heaters

    SERVICE (cont.) If continuity is present as described, reconnect the wires, the tank heaters are operating properly. TANK HEATERS 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.

  • Page 32: Transformer

    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.
  • Page 33 SERVICE (cont.) TRANSFORMERS (cont.) P1383 FIG. 36 TRANSFORMER TERMINALS Page 33 32248 100500...
  • Page 34 Page 34 32248 100500...

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