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Bunn Single Operating & Service Manual

Bunn single: user guide
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BUNN
OPERATING & SERVICE MANUAL
To ensure you have the latest revision of the manual or to obtain the illustrated parts catalog, please visit the Bunn-O-Matic website, at
www.bunn.com. This is absolutely FREE, and the quickest way to obtain the latest catalog and manual updates. Contact Bunn-O-Matic
Corporation at 1-800-286-6070 to obtain a paper copy of the required Illustrated Parts Catalog mailed via U.S. Postal Service.
27038.0000F
11/07 ©1996 Bunn-O-Matic Corporation
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
®
SINGLE
(Serial # SNG0005000 - Up)
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  • Page 1 BUNN-O-MATIC CORPORATION To ensure you have the latest revision of the manual or to obtain the illustrated parts catalog, please visit the Bunn-O-Matic website, at www.bunn.com. This is absolutely FREE, and the quickest way to obtain the latest catalog and manual updates. Contact Bunn-O-Matic Corporation at 1-800-286-6070 to obtain a paper copy of the required Illustrated Parts Catalog mailed via U.S.
  • Page 2 SOLE OPTION AS SPECIFIED HEREIN, TO REPAIR, REPLACEMENT OR REFUND. In no event shall BUNN be liable for any other damage or loss, including, but not limited to, lost profits, lost sales, loss of use of equipment, claims of Buyer’s customers, cost of capital, cost of down time, cost of substitute equipment, facilities or services, or any other special, incidental or consequential damages.
  • Page 3 USER NOTICES The notices on this brewer should be kept in good condition. Replace unreadable or damaged labels. 00656.0000 00831.0000 37881.0000 20201.5600 00658.0000 12364.0000 Page 3 27038 100407...

  • Page 4: Plumbing Requirements

    " 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 PLUMBING HOOK-UP NOTE: When the brewer is being connected to a water supply with a back flow preventer, it is recom- mended that a "Water Hammer Arrestor" be added between the brewer and the back flow preventer. 1. Attach the flare fitting from the short piece of tubing on the strainer/flow control (supplied) to the water inlet fitting on the bottom of the brewer.
  • Page 6 CE REQUIREMENTS • This appliance must be installed in locations where it can be overseen by trained personnel. • For proper operation, this appliance must be installed where the temperature is between 0°C to 35°C. • Appliance shall not be tilted more than 10° for safe operation. •...
  • Page 7 COFFEE BREWING 1. Select the desired batch size. 2. Insert a BUNN filter into the funnel. 3. Pour the proper amount of fresh coffee into the filter and level the bed of grounds by gently shaking. 4. Slide the funnel into the funnel rails.
  • 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 Brew cycle will not start (cont.) Automatic refill will not operate Probable Cause 3. ON/OFF switch 4. Start switch 5. Timer 6. Dispense Valve 7. Control Assembly (Electronic) 1. No water 2. Water strainer/flow control (.330 GPM) 3.
  • Page 10 TROUBLESHOOTING (cont.) Problem Beverage level will not adjust (Selec- tor switch in any position) Water flows into tank continuously (ON/OFF Switch "ON") Water flows into tank continuously (ON/OFF Switch "OFF") Water from tank is not hot Probable Cause 1. Selector switch 1.
  • Page 11 TROUBLESHOOTING (cont.) Problem Water from tank is not hot (cont.) Server warmer is not hot. Spitting or unusual steaming from sprayhead or airvent. Inconsistent beverage level in server. Probable Cause 5. Triac assembly (Electronic) 1. ON/OFF switch 2. Warmer element 1.
  • Page 12 See page Refer to Adjustments on page 5 step #7. For test procedures see page 15. BUNN paper filters should be used for proper extraction. Check sprayhead The brew cycle should be started only with an empty server under the funnel.
  • Page 13 3. Water supply 4. Tank heater 5. Contactor Page 13 Remedy The BUNN paper filter should be centered in the funnel and the bed of ground coffee leveled by gentle shaking. Empty the server, remove its cover, and place the server on the warmer.

  • Page 14: Table Of Contents

    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 electri- cal equipment should be performed only by qualified service personnel.

  • Page 15: Bypass Valve

    SERVICE (cont.) BYPASS VALVE 22978.0000 FIG. 1 BYPASS VALVE Location: The bypass valve is located inside the right front of the hood. Test Procedures: 1. Disconnect the brewer from the power source and place a server beneath the funnel. 2. Check the water level in the tank to confirm that it is within 1/2"...

  • Page 16: Brewer Selector Switch

    SERVICE (cont.) BREW SELECTOR SWITCH 22978.0000 FIG. 3 BREW SELECTOR SWITCH Location: The brew selector switch is located in the front of the hood on the right side. Test Procedure: 1. Disconnect the brewer from the power supply. 2. Separate the connector on the selector switch harness from the brew timer circuit board.
  • Page 17 SERVICE (cont.) BREW SELECTOR SWITCH (cont.) WHI/VIO to By-Pass Valve WHI/RED to Dispense Valve GRY to GRY Lead on Interface Socket PNK to PNK Lead on Interface Socket TAN to TAN Lead on Interface Socket FIG. 4 BREW SELECTOR SWITCH TERMINALS Page 17 To Timer P827...

  • Page 18: Contactor Assembly

    SERVICE (cont.) CONTACTOR ASSEMBLY (W/MECHANICAL THER- MOSTAT ONLY) 22978.0000 FIG. 5 CONTACTOR ASSEMBLY Location: The contactor assembly is located inside the hood just behind the dispense valve. Test Procedures: Mechanical Thermostat 1. Disconnect the brewer from the power source. 2. Disconnect the white wire of the two pole 120V ter- minal block, white wire of the three pole 120/208V or 120/240V or the red wire of the two pole 200V or 240V terminal block and the black wire of the...
  • Page 19 SERVICE (cont.) CONTACTOR ASSEMBLY (W/ MECHANICAL THER- MOSTAT ONLY) (cont.) If continuity is present as described, the contactor is operating properly. If continuity is not present as described, replace the contactor. Removal and Replacement: 1. Remove all wires from the contactor. 2.

  • Page 20: Control Thermostat

    SERVICE (cont.) CONTROL THERMOSTAT 22978.0000 FIG. 7 CONTROL THERMOSTAT Location: The control thermostat is located inside the lower left front of the brewer on the component bracket. 1. Disconnect the brewer from the power source. 2. Locate the blue wires on the control thermostat. 3.
  • Page 21 SERVICE (cont.) CONTROL THERMOSTAT (cont.) NOTE - The capillary tube must be clear of any electri- cal termination and not kinked. 7. Using a #8-32 slotted head screw fasten the control thermostat to the component bracket. 8. Refer to Fig. 8 when reconnecting the wires. 9.

  • Page 22: Dispense Valve

    SERVICE (cont.) DISPENSE VALVE 22978.0000 FIG. 9 DISPENSE VALVE Location: Dispense valve is located inside the hood directly above the sprayhead. Test Procedures: 1. Disconnect the brewer from the power source. 2. Disconnect the wires from the dispense valve and check the voltage across the white/violet wire and white/green wire.
  • Page 23 SERVICE (cont.) ELECTRONIC CONTROL ASSEMBLY 22978.0000 IN G FIG. 11 ELECTRONIC CONTROL ASSEMBLY 8. Temperature Sensor 1. Electronic Control 9. Dispense Valve 2. Terminal Block 10. Bypass Valve 3. Timer 11. Ready Light 4. Liquid Level Switch 12. Solenoid Valve &...
  • Page 24 SERVICE (cont.) ELECTRONIC CONTROL ASSEMBLY (cont.) a.) 120 volts ac for two wire 120 volt models, three wire 120/208 volt models and three wire 120/240 volt models after a delay of approximately 1 second. b.) 200 to 240 volts ac for two wire 200 or 240 volt models after a delay of approximately 1 second.
  • Page 25 SERVICE (cont.) ELECTRONIC CONTROLS (cont.) PROBLEM WATER NOT HOT ENOUGH TURN TEMPERATURE LED ON CONSTANTLY ADJUSTING SCREW (14) CLOCKWISE CONTINUOUSLY MEASURE VOLTAGE LED ON AT TANK HEATER (5) REPLACE CONTROL ASSEMBLY (1) VOLTAGE PRESENT REPLACE TANK HEATER (5) LIMIT THERMOSTAT (6) REPLACE LIMIT THERMOSTAT (6) REPLACE CONTROL...
  • Page 26 If voltage was present as described, the temperature control of the system is operating properly. If voltage was not present as described, contact Bunn- O-Matic to order an electronic control assembly (1), temperature sensor (8), and triac assembly (15) for evaluation and proceed to #9.

  • Page 27: Electronic Control

    NOTE - Each triac installation requires the use of an approved silicone heat sink compound. Bunn-O-Matic recommends the use of Dow Corning 340 compound or equivalent. It can be purchased direct from Bunn- O-Matic (part number M2522.1000). 1. Place the tank heater switch on the electronic control assembly in the “OFF”...

  • Page 28: Level Control Board And Level Probe

    SERVICE (cont.) LEVEL CONTROL BOARD AND LEVEL PROBE (Elec- tro/mechanical only) 22978.0000 FIG. 14 LIQUID LEVEL CONTROL BOARD Location: The level control board is located inside the front in center of the brewer on the component bracket. The level probe is located inside the hood on the center rear of the tank lid.
  • Page 29 SERVICE (cont.) LEVEL CONTROL BOARD AND LEVEL PROBE (Electro/ mechanical only)(cont.) Move the probe's flat end away from the brewer housing. The indication should again be a.) 120 volts ac for two wire 120 volt models, three wire 120/208 volt models and three wire 120/240 volt models.

  • Page 30: Limit Thermostat

    SERVICE (cont.) LIMIT THERMOSTAT FIG. 16 LIMIT THERMOSTAT Location: The limit thermostat is located inside the hood on the tank lid just to the left of the tank heater. Test Procedure: 1. Disconnect the brewer from the power supply. 2. Disconnect both black wires from the limit ther- mostat.

  • Page 31: On/Off Switch (Warmer)

    SERVICE (cont.) ON/OFF SWITCH (Warmer) FIG. 18 ON/OFF SWITCH Location: The ON/OFF switch is located on the front of the hood in the center to the right of the start switch. Test Procedure: 1. Disconnect the brewer from the power source. 2.

  • Page 32: Overflow Protection Switch

    SERVICE (cont.) OVERFLOW PROTECTION SWITCH 22978.0000 FIG. 20 OVERFLOW PROTECTION SWITCH Location: The overflow protection switch is located inside the hood on the tank inside the copper overflow cup. To test the overflow protection switch, access will also be needed to the level control board or electronic control assembly and terminal block.

  • Page 33: Solenoid (Inlet)

    SERVICE (cont.) SOLENOID VALVE (Inlet) FIG. 22 SOLENOID VALVE Location: The inlet solenoid valve is located inside the hood on the right side of the upper component bracket. Test Procedure: 1. Disconnect the brewer from the power source. 2. Remove both wires from the solenoid valve coil terminals.

  • Page 34: Start Switch (Brew)

    SERVICE (cont.) START SWITCH FIG. 24 START SWITCH Location: The momentary start switch is located in front of hood just to the left of the ON/OFF switch. Test Procedure: 1. Disconnect the brewer from the power source and remove the wires from both terminals of the switch.

  • Page 35: Tank Heater

    SERVICE (cont.) TANK HEATER FIG. 26 TANK HEATER Location: The tank heater is located inside the hood on the right rear of the tank lid. Test Procedure: Electro/Mechanical Models. 1. Disconnect the brewer from the power supply. 2 Check the voltage across the black and the red wire on 120V, 208 or 240V models on the tank heaters.

  • Page 36: Timer (Early Models)

    SERVICE (cont.) TIMER (First Type) FIG. 28 TIMER Location: The timer is located inside the left front of the brewer on the upper part of the component bracket. Test Procedures: 1. Disconnect the brewer from the power source. 2. Disconnect the wires from the timer terminals TL3, TL4 and TL5 and rotate the dial(s) fully counter- clockwise.
  • Page 37 SERVICE (cont.) TIMER (First Type)(cont.) WHI/VIO TL1 to ON/OFF Switch WHI/VIO TL1 to Warmer Element WHI TL2 To Terminal Block and Warmer Element (120V Two Pole, 120/208V or 120/240V Three Pole Terminal Block) RED TL2 to Terminal Block and Warmer Element (200V or 240V Two Pole Terminal Block) WHI/ORA TL3 to Start Switch (Top) WHI/GRN TL4 to Dispense Valve (Upper Front)

  • Page 38: Digital Timer (Late Models)

    SERVICE (cont.) DIGITAL TIMER (SecondType) FIG. 30 DIGITAL TIMER Location: The timer is located inside the left front of the brewer on the upper part of the component bracket. Test Procedure. NOTE: Do not remove or install wires while timer board is installed.
  • Page 39 SERVICE (cont.) TIMERS (Late Models)(cont.) Timer Setting: NOTE: Check that the brewer is connected to water sup- ply, the tank is properly filled, and a funnel and server are in place, prior to setting or modifying volumes. NOTE: All volume settings must be done with the sprayhead installed.

  • Page 40: Warmer Element

    SERVICE (cont.) WARMER ELEMENT FIG. 32 WARMER ELEMENT Location: The warmer element is located in the base of the brewer under the warmer plate. Test Procedures: 1. Disconnect the brewer from the power source. 2. Use the white wire or red wire to the terminal block and the white/violet wire to the warmer element.
  • Page 41 3/4 BATCH WHI/YEL BATCH COMMON WATER BYPASS WHI/GRN ON/OFF SWITCH GRINDER WHI/VIO 26885.0001D 01/07 © 1996 BUNN-O-MATIC CORPORATION White Strip-Tac Plus Black Ink Finished Size: 5.0" x 5.75" ?65% Reduction Page 41 RED-12 (208 OR 240V) WHI-12 (120V) WHI-12 (120V) N.O.
  • Page 42 SCHEMATIC WIRING DIAGRAM SINGLE BREWER ECA LIMIT THERMOSTAT TANK HEATER BLK-12 BLK-12 READY L.E.D. OVERFLOW PROTECTION SW OPTIONAL 3-SET SELECTOR SWITCH SHOWN WITH GRINDER INTERFACE OPTION 1/4 BATCH 1/3 BATCH FRACTIONAL BATCHES 1/2 BATCH (CONNECT 2/3 BATCH AS REQUIRED) FULL BATCH...
  • Page 43 SCHEMATIC WIRING DIAGRAM SINGLE-A & -B BREWER LIMIT THERMOSTAT BLK-12 BLK-12 OVERFLOW PROTECTION SW OPTIONAL 3-SET SELECTOR SWITCH SHOWN WITH GRINDER INTERFACE OPTION FRACTIONAL BATCHES (CONNECT AS REQUIRED) FULL BATCH (NO CONNECTION) WHI/VIO INTERFACE CONNECTOR 200 OR 240 VOLTS AC...
  • Page 44 SCHEMATIC WIRING DIAGRAM SINGLE-A & -B BREWER ECA LIMIT THERMOSTAT TANK HEATER BLK-12 BLK-12 READY L.E.D. OVERFLOW PROTECTION SW OPTIONAL 3-SET SELECTOR SWITCH SHOWN WITH GRINDER INTERFACE OPTION 1/4 BATCH 1/3 BATCH FRACTIONAL BATCHES 1/2 BATCH (CONNECT 2/3 BATCH AS REQUIRED)

  • Page 45: Schematic Wiring Diagram

    SINGLE BREWER W/DIGITAL BREWER CONTROL SCHEMATIC WIRING DIAGRAM WHI/RED J1-1 WHI/RED ON/OFF SW REFILL BREW WHI/BLU J1-24 J3-1 WHI/VIO OVERFLOW PROTECTION SWITCH N.C. J3-40 White Strip-Tac Plus LOWER WARMER WHI/RED WHI/RED TRIAC WHI/VIO LIMIT THERMOSTAT TANK HEATER AUXILIARY OUTLET OPTIONAL...

  • Page 46: Wiring Diagrams

    SINGLE BREWER W/DIGITAL BREWER CONTROL SCHEMATIC WIRING DIAGRAM WHI/RED J1-1 WHI/RED BREW WHI/BLU J1-24 J3-1 PROBE, DRY PLUG WHI/VIO PREVENTION OVERFLOW PROTECTION SWITCH J3-40 ON/OFF LOWER WARMER WHI/RED WHI/RED TRIAC REFILL WHI/VIO LIMIT THERMOSTAT TANK HEATER START SW OPTIONAL DAY/NIGHT...

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