BUNN ® DG-2 WDG-2 02328.0000(4) INSTALLATION & OPERATING MANUAL BUNN-O-MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD, ILLINOIS 62708-3227 PHONE: (217) 529-6601 FAX: (217) 529-6644 10854.
CONTENTS Introduction .............................................................................. 2 Warranty ................................................................................... 2 User Notices ............................................................................. 3 Electrical Requirements ............................................................ 4 Operating Controls .................................................................... 4 Initial Set-Up .............................
USER NOTICES Carefully read and follow all notices on the grinder and in this manual. They were written for your protection. All notices on the grinder are to be kept in good condition. Replace any unreadable or damaged labels. #05876.0000 #24237.0000 #20545.0000 #05942.
ELECTRICAL REQUIREMENTS This grinder has an attached cordset and requires 2-wire, grounded service rated 120 volts ac, 15 amp, single phase, 60 Hz. OPERATING CONTROLS Off/On/Start Switch OFF - (upper position) Switching to this position stops all operation of the grinder. ON - (middle position) The switch will return to this position after a grind cycle has begun and will remain in this position after grinding has ceased.
DG-2 INITIAL SET-UP 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. WARNING - Unplug grinder before removal of any panel. Read NOTICE attached to upper front inspection panel. Remove upper front inspection panel located below control switches and the rear panel. Remove shipping bracket, materials and discard. Reinstall upper front inspection panel and rear panel. Open the top lid(s). Clear all foreign objects and shipping material from the hopper compartments and the entrance to the grind chambers.
SPECIAL SET-UP FOR FLAVORED COFFEE BEANS LY E MB B E MP UG EIN E NOT I CMOVR B E H RE B HL O P P E R B E F O R E A M H YC LEAN GRIND C TY R COA S SSE R. G F T O H R IS E R COV EA U R COA S E FIN SE AR CO THORO 7. E FIN SE AR CO LY 5. 6. E MB 4. SSE R. 3. B 2. WARNING - Unplug grinder before removal of any panel. Select the hopper to be used for flavored coffee beans. Remove upper front inspection panel located below control switches.
10854 030300
CLEANING EXTERIOR SURFACES The use of a damp cloth rinsed in any mild, nonabrasive, liquid detergent is recommended for cleaning all surfaces on Bunn-O-Matic equipment. Care should be taken not to scratch the hopper or windows with any abrasive material. Regular cleaning will keep your grinder looking new for years. GRIND CHAMBER 1. WARNING - Unplug grinder before removal of any panel or grind chamber housing parts. 2. Empty all beans from both hoppers. 3.
ADJUSTMENTS The grind can be set from fine to very coarse. The grind may be adjusted for use in most commercial coffee brewers. The following procedures should be used to make adjustments. NOTE - On DG-2 grinders a change in the burr adjustment will also change the amount dispensed. Any adjustment to the burrs should be followed by an adjustment of the timer, C Burr Adjustment -F RSE INE A 1. Unplug the grinder and empty all beans from the hopper(s). O 2.
Coffee Weight/Timer Settings Approx. 4.0 seconds per ounce, Medium Roast, Drip Grind. Approx. 5.5 seconds per ounce, Dark Roast, Drip Grind. Time will vary depending on bean density & grind size. Check samples by weight. DIGITAL CONTROL DISPLAY ASSEMBLY FUNCTION LIST - WDG-2 FUNCTION NO. FUNCTION Place funnel with filter into rails, press (Func) button to advance to Function One. RANGE MIN. MAX. 1. When entering this function, load sensor is tared.
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. • All electronic components have 120 volt ac and low voltage dc potential on their terminals.
TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Grinder will not start. (cont.) 5. Motors Refer to Service - Motors for testing procedures. See page 14. 6. Fuse Refer to Service - Fuse for testing procedures. See page 20. 1. Off/On/Start switch A) Place the switch in the “OFF" upper position. Grinder will not shut off. (B) Refer to Service - Off/On/Start Switch for testing procedures. See page 13. Grinder starts, but will not dispense from either hopper.
TROUBLESHOOTING (cont.) Problem Probable Cause Remedy LED will not come on when motor is running. 1. No power Check timer and for loose connections. 2. Faulty LED Refer to Service - LED. See page 21. Weigh control assembly leaking oil. WDG-2 Replace - See removal and replacement page 23 Incorrect amount of coffee. WDG-2 Check function list on setting the weight to be ground (page 8), if settings are ok replace weigh control assembly. See page 23 for removal and replacement.
SERVICE This section provides procedures for testing and replacing various major components used in this grinder should service become necessary. Refer to Troubleshooting for assistance in determining the cause of any problem. WARNING Use only on a properly protected circuit capable of the rated load. Electrically ground the chassis. Follow national/local electrical codes. Do not use near combustibles.
the switch. SERVICE (cont.) 4. )2(0000.61752 )4(4000.82320 0000.31752 )01(1000.11310 Check for continuity across the terminals on the left side of the switch when it is in the center "ON" position. Continuity must not be present in the upper "OFF" position. If continuity is present as described, reconnect the wires, the switch is operating properly. If continuity is not present as described, replace the switch. P739 The hopper is attached with ten #8-32 x .25” slotted head locking screws.
SERVICE (cont.) Hopper Selector Switch (cont.) PNK TO OPTIONAL MULTISET SWITCH Test Procedure: 1. Disconnect grinder from the power supply. 2. Remove all wires from the switch terminals. 3. Place the selector switch in the left position. 4. Check for continuity across the center and right terminals on the rear of the switch. 5. Continuity must not present across the center and left terminals on the rear of the switch. 6. Check the bottom row, then the top row of terminals.
SERVICE (cont.) Motor (cont.) Test Procedure: 1. Disconnect grinder from the power supply. 2. Remove upper front inspection panel. 3. Remove the two 1/4"-20 screws (A) holding the front cover (B). 4. Remove load disc (C) from burr auger rotor/assembly (D). 5. Remove burr auger rotor/spring assembly 6. 7. 8. 9. (D) from the burr housing (H). Remove rear panel. Disconnect the red, black and blue wires from the left or right motor to the motor circuit assembly (1).
SERVICE (cont.) Motor Circuit Assembly Motor (cont.) Removal and Replacement - GRIND CHAMBER H G D C C O NE E MP UG THORO - FI SE G F T O H R IS E R COV EA S E R. E S R A MBL Y E FIN SE AR CO B EIN E NOT I CMOBVRUBN N TY E H RE B HL O P P E R B E F O R E A M H YC LEAN GRIND C 20667.0000 20666.0000 P750 Location: The motor circuit assembly is located on the rear of motor mounting bracket. E FIN 2. 3. 4. 5. 6. 7. 8.
SERVICE (cont.) Timer - DG-2 (cont.) Test Procedure: 1. Disconnect grinder from the power source. 2. Slide timer with wires connected from housing. 3. Place the hopper selector switch in the left position. 4. Disconnect eight pin plug J4 from timer board. 5. Check the voltage between J4-1 and J4-2 with a voltmeter. Connect the grinder to the power source. The indication must be 120 volts AC. 6. Disconnect grinder from the power source. If voltage is present as described, proceed to #7.
SERVICE (cont.) Timer - DG-2 (cont.
SERVICE (cont.) Grinders with One or Two Brewer Optional Interface Weigh Control Board - WDG-2 (cont.) 1. Set the brewer selector switch on one third batch with grinder "OFF/ON/START" switch in the "ON" position. 2. Select the two third's batch, if the readout is not different then adjust the settings and return selector switch to one third batch. The readout should now be different. 3.
SERVICE (cont.) Fan Fuse NOTICE For connection to Bunn-Omatic Coffee Brewer Models: Dual, OT, Single, & System III only. (24 volt N.E.C. Class 2 circuit only.) BUNN MANUFACTURED BY BUNN-O-MATIC CORPORATION SPRINGFIELD, ILLINOIS, U.S.A. MODEL S/N VOLTS A.C. AMP WATTS PHASE WIRE HERTZ COVERED UNDER ONE OR MOREOF THE FOLLOWING PATENTS : ONE OR MORE OTHER PATENTS MAY BE PENDING P748 WARNING Use only on a properly protected circuit capable of the rated load. Electrically ground the chassis.
SERVICE (cont.) Weigh Control Assembly - WDG-2 L.E.D P749 Location: The L.E.D is located on the front of the grinder just above hopper selector switch. Test Procedure: 1. Unplug the grinder. 2. Remove the wire nuts from both sets of wires. 3. With a voltmeter set to read DC volts. Attach the positive (+) lead to the black and pink wires and the negative (-) lead to the gray wires. 4. Connect grinder to the power supply. 5. Initiate a grind cycle. Voltage should be approximately 2 volts DC. 01593.
SERVICE (cont.) Weigh Control Assembly - WDG-2 (cont.) 01593.0000 00718.0000 6 8 7 1 5 3 4 2 P941 1. 2. 3. 4. Front Inspection Panel Weigh Control Board and Mounting Bracket Weigh Control Mounting Bracket Weigh Control Assembly 5. 6. 7. 8.
SERVICE (cont.) Weigh Control Assembly - WDG-2 (cont.) Removal and Replacement 1. Disconnect grinder from the power source. 2. Remove the four #6-32 truss head screws securing lower front inspection panel (1). Remove panel with digital control display assembly attached. 3. Remove the one #6-32 truss head screw securing the weigh control board mounting bracket (2) to the weigh assembly mounting bracket (3). 4.
WIRING DIAGRAMS SCHEMATIC WIRING DIAGRAM DG2 L1 N GRN OFF/ON START SW 10 AMP TIMER J4-1 BLK WHI VIO ORA WHI/RED RED WHI ORA ORA YEL ORA PNK SELECTOR SW PNK J4-8 RED YEL GRN TAN GRY TAN GRY J1-1 BLU VIO WHI/BLU (OPTIONAL) MULTI-SET SW GRN J1-10 (OPTIONAL) BREWER INTERFACE CONNECTOR PNK BLK PNK 4 3 2 1 GRY PNK TAN BREWER 4 INTERFACE 3 CONNECTOR 2 1 GRY PNK TAN 120 VOLTS AC 2 WIRE SINGLE PHASE 60 HZ PNK GRINDING PNK BLK BLU WHI/RED WHI BLK BLK MOTOR CIRCUIT ASSY FAN WHI/BLU T1 T2 T3 T4
WIRING DIAGRAMS SCHEMATIC WIRING DIAGRAM WDG2 L1 N GRN 10 AMP J4-1 CIRCUIT BOARD OFF/ON START SW BLK WHI VIO ORA WHI/RED RED WHI ORA ORA ORA PNK SELECTOR SW YEL PNK J4-8 J1-1 BLU RED YEL GRN TAN GRY TAN GRY VIO WHI/BLU (OPTIONAL) MULTI-SET SW GRN J1-10 J3-1 J3-4 PNK BLK PNK PNK BLK RED GRY ORA GRINDING PNK BLK BLU MOTOR BLU CIRCUIT BLK ASSY RED J5-1 WHI RED BLK BLU J5-6 J1-1 WHI/BLU CONTROL ASSY WHI/RED WHI BLK BLK GRY GRY BLU RT BLU MOTOR BLK RED (D.C.