Bunn WDG-2 User Manual 2

BUNN

®

DG-2

WDG-2

02328.0000(4)

INSTALLATION & OPERATING MANUAL

BUNN-O-MATIC CORPORATION

POST OFFICE BOX 3227

SPRINGFIELD, ILLINOIS 62708-3227

PHONE: [phone] FAX: [phone]

10854.0000 3/00 ©1995 Bunn-O-Matic Corporation

CONTENTS

Introduction .............................................................................. 2

Warranty ................................................................................... 2

User Notices ............................................................................. 3

Electrical Requirements ............................................................ 4

Operating Controls .................................................................... 4

Initial Set-Up .............................................................................5

Cleaning .................................................................................... 6

Coffee Grinding .........................................................................6

Adjustments .............................................................................. 7

Trouble Shooting ...................................................................... 9

Service ....................................................................... 12 thru 23

Wiring Diagrams ................................................................24,25

INTRODUCTION

This equipment will store up-to six pounds of whole bean coffee in each of two hoppers and grind it to a preset
grind and amount into an awaiting funnel and filter from most commercial drip coffee brewers. The equipment is only
for indoor use on a sturdy counter or shelf. Adequate space must be available above the grinder to raise the lids when
adding beans. Use only with whole bean coffee.

The grind is preset at the factory to drip specifications as set forth by the United States Department of Commerce
and adopted by the Coffee Brewing Center of the Pan American Coffee Bureau. Adjustments may be made to alter both
the amount and grind from the factory setting.

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.) Bunn warrants the compressor on refrigeration equipment to be commercially free from defects in mate-

rial and workmanship for two years from the date of installation.

3.) Bunn warrants that the grinding burrs on coffee grinding equipment will grind coffee to meet original
factory screen sieve analysis for three years from date of installation or for 30,000 pounds of coffee, whichever
comes first.

This warranty does not apply to any equipment, component or part that was not manufactured by Bunn or
that, in Bunn’s judgement, has been affected by misuse, neglect, alteration, improper installation or operation,
improper maintenance or repair, damage or casualty.

THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARRANTY, WRITTEN OR
ORAL, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF EITHER MER­CHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. The agents, dealers or employees of Bunn are not

authorized to make modifications to this warranty or to make additional warranties that are binding on Bunn.
Accordingly, statements by such individuals, whether oral or written, do not constitute warranties and should not
be relied upon.

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. If Bunn determines, in
its sole discretion, that the equipment does not conform to the warranty, Bunn shall repair the equipment with no
charge for parts during the warranty period and no charge for labor by a Bunn Authorized Service Representative
during the warranty period. If Bunn determines that repair is not feasible, Bunn shall, at its sole option, replace
the equipment or refund the purchase price for the equipment.

THE BUYER’S REMEDY AGAINST BUNN FOR THE BREACH OF ANY OBLIGATION ARISING OUT OF THE
SALE OF THIS EQUIPMENT, WHETHER DERIVED FROM WARRANTY OR OTHERWISE, SHALL BE LIMITED, AS
SPECIFIED HEREIN, TO REPAIR OR, AT BUNN’S SOLE OPTION, 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.

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10854 030300

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

#05942.0000
DG-2 ONLY

3

10854 030300

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.

START - (lower, momentary position) Pressing the switch to this position and releasing initiates

a grind cycle.

Hopper Selector Switch
LEFT - Switching to this position allows beans to be ground from the left

hopper.
RIGHT - Switching to this position allows beans to be ground from the
right hopper.

P734

Dispense Timer - DG-2

The dispense timer controls the amount of beans that will be ground in a cycle. The timer can be adjusted
to dispense a different amount from each hopper. The scale is from 0.1 to 60.0 seconds. Refer to the
Adjustments section for timer setting chart. See page 7.

+/Increase - (left momentary push-button)

DISPENSE TIME (Seconds)

I 0.0

DISPLAY

Increase Decrease

+

Readout will be displayed for 5 minutes.

Timer can only be adjusted
while readout is displayed.

WARNING

HAZARDOUS VOLTAGE

Pressing this button will increase the dispense interval on the timer while
the readout is displayed. The interval will change slowly for the first second’s
indication, then speed-up for the next fifteen second’s indication, and increase
very fast after that until it reaches the limit on the scale.

DISPLAY - (center momentary push-button)

Pressing this button will display the current timer readout. The timer can
only be adjusted while the readout is displayed. The indication on the display
will last for five minutes.

UNPLUG GRINDER

BEFORE REMOVING!

–/Decrease - (right momentary push-button)

P595

Pressing this button will decrease the dispense interval on the timer while
the readout is displayed. The interval will change slowly for the first second’s

indication, then speed-up for the next fifteen second’s indication, and increase very fast after that until it reaches
the limit on the scale.

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10854 030300

NOTICE

DG-2 INITIAL SET-UP

1. WARNING - Unplug grinder before removal of any panel.

2. Read NOTICE attached to upper front inspection panel.

3. Remove upper front inspection panel located below control switches and
the rear panel.

4. Remove shipping bracket, materials and discard.

5. Reinstall upper front inspection panel and rear panel.

6. Open the top lid(s). Clear all foreign objects and shipping material from the
hopper compartments and the entrance to the grind chambers.

7. Remove the lower front inspection panel.

8. Plug-in the grinder.

9. Select either the left or right hopper with the selector switch. Do not press
the start switch.

10. The dispense timer panel readout will indicate the present timer setting in
seconds and will remain displayed for five minutes.

11. Increase or decrease the timer setting to obtain the desired amount of cof­fee for the hopper selected by pressing the appropriate button (+ or –).

12. Repeat steps 9 thru 11 for the other hopper. The display will go out on its
own. Reinstall lower front inspection panel.

13. Fill the hopper compartments with whole bean coffee. (Capacity 6 pounds
each). The grinder is now ready for use.

DISPENSE TIME (Seconds)

I 0.0

DISPLAY

Increase Decrease

+

Readout will be displayed for 5 minutes.

Timer can only be adjusted
while readout is displayed.

WARNING

HAZARDOUS VOLTAGE

UNPLUG GRINDER

BEFORE REMOVING!

P734

WDG-2 INITIAL SET-UP

1. WARNING - Unplug grinder before removal of any panel.

2. Read NOTICE attached to the upper front inspection panel.

3. Remove upper front inspection panel located below control switches and
the rear panel.

4. Remove shipping bracket, materials and discard.

5. Reinstall upper front inspection panel and rear panel.

6. Open the top lid(s). Clear all foreign objects and shipping material from the
hopper compartments and the entrance to the grind chambers.

7. Remove the four screws securing the lower front inspection panel and care­fully pull out far enough to view and operate the digital control display
assembly.

8. Plug-in the grinder.

9. Select either the left or right hopper with the selector switch. Do not press
the start switch.

10. The digital control display assembly screen displays selected weight when
idle. When grinding - display resets to 0.00 and shows increasing weight.
Display shows final weight for ten seconds and returns to selected weight.

11. Use (+) or (-) buttons and left or right hopper selector switch to set selected
weights, .50 oz minimum - 16 oz maximum.
NOTE: Refer to function list on page 8 for recalibration of weigh control
assembly if necessary.

NOTICE

The Shipping Bracket and

All Packing Material

Behind This Panel
MUST be Discarded
Before Using Grinder!

(Refer to the Operating & Service Manual for

Additional Set-up Information.)

NOTICE

For connection to Bunn-Omatic

Coffee Brewer Models:
Dual, OT, Single, & System III only.
(24 volt N.E.C. Class 2 circuit only.)

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5

10854 030300

SPECIAL SET-UP FOR FLAVORED COFFEE BEANS

1. WARNING - Unplug grinder before removal of

any panel.

2. Select the hopper to be used for flavored coffee
beans.

3. Remove upper front inspection panel located
below control switches.

4. Locate dechaffer blade lever for hopper(s) se­lected in step #2.

5. Rotate lever clockwise approximately 90°.

6. Remove clip(s) from bag inside of grinder hous­ing and clip to the right of the lever. This will
hold the dechaffer open.

7. Reinstall upper front inspection panel.

25705.0000

02311.0000(4)

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10854 030300710854 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. Remove upper front inspection panel located below control switches.

4. Remove the two nuts holding dispense chute cover. Carefully wipe inside surface of dispense chute and

cover with a dry clean cloth.

5. Select a grind chamber to clean first. Each grind chamber should be disassembled, cleaned and reassembled

before cleaning the opposite side.

6. Remove the two screws holding front cover to burr housing. Carefully remove burr housing front cover.

Clean the inside surface with a dry stiff nonmetallic bristle brush and wipe with a dry clean cloth.

7. Carefully remove rotor button, rotor, brass bushing and steel washer from grinder. Clean all parts with a dry

stiff nonmetallic bristle brush and wipe with a dry clean cloth.

8. Clean the grind chamber with a dry stiff nonmetallic bristle brush and wipe with a dry clean cloth. Use a small

screw driver to dislodge coffee packed in the discharge chute at the base of the grind chamber and wipe
clean. Use care not to damage dechaffer blade.

9. Reinstall steel washer, brass bushing (flanged end first), rotor, rotor button and front cover to burr housing.

10. Repeat steps 6 through 9 on remaining grind chamber.

11. Reinstall dispense chute cover.

12. Reinstall upper front inspection panel.

13. Refer to adjustments section below to vary the grind dispensed from each grind chamber.

COFFEE GRINDING

1. Select (either left or right hopper) with selector switch and visually inspect the desired hopper for an ample

supply of whole bean coffee.

2. Place a paper filter into the brew funnel. The filter must not be folded-over or tilted to one side.

3. Insert the funnel into the funnel rails and push until it stops.

4. Momentarily press off/on/start switch to the "START" lower position and release. The grinding action will stop

automatically after the preset amount of ground coffee is dispensed into the funnel.

5. Remove the funnel from the grinder and level the bed of grounds by gently shaking.

6. The loaded funnel is now ready for use in any commercial drip coffee brewer according to the manufacturer’s

instructions.

P934

STEP #5

P935

STEP #1

P931

STEP #2

P932 P933

STEP #3

STEP #4

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10854 030300

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,

Burr Adjustment

1. Unplug the grinder and empty all beans from the hopper(s).

2. Plug-in the grinder, place funnel with filter into the funnel rails. Momentarily

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press the off/on/start switch to the “START” (lower) position (with desired
hopper selected) and release, run a few grind cycles until all of the coffee in the
grind chamber is dispensed.

3. Remove the upper front inspection panel.

4. Loosen the burr adjustment screw from its locked position.

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5. Hand loosen the adjustment locking nut around the screw approximately one
turn.

N

P581

P581

6. Make sure funnel with filter is still in place in the funnel rails. Press the off/on/start switch to the “START”
(lower) position and release,slowly turn the adjusting screw in a clockwise direction until a metallic whine is
heard due to the rubbing of the grinding burrs. (It may be necessary to start more than one grind cycle to
obtain this sound.)

7. Make a mark with a pen on the decal to note the position of the arrow on the grind adjustment screw.

8. The following settings approximately correspond to the CBC recognized grinds. All are referenced from the
arrow position marked in step #7.

FINE GRIND: Rotate the adjusting screw 7 hash marks in a counterclockwise direction.
DRIP GRIND: Rotate the adjusting screw 8 hash marks in a counterclockwise direction.
REGULAR (COARSE) GRIND: Rotate the adjusting screw 12 hash marks in a counterclockwise direction.
NOTE: Exact adjustment will vary according to bean roast or added flavoring.

9. Hold the adjusting screw in its set position with a screwdriver while tightening the lock nut to a snug position
by hand. The lock nut should now be tight against the burr housing front cover.

10. Repeat steps 1 thru 9 for remaining hopper if desired.

11. Reinstall upper front inspection panel.

Timer Adjustment - DG-2

1. Unplug the grinder and remove the lower front inspection panel.

2. Determine the grind setting. (The factory setting is drip, to determine other settings, refer to the previous
section.)

3. Use the instructions below to find the approximate timer setting for the grind and amount of coffee desired.

4. Plug-in grinder and select (left or right) desired hopper. Momentarily press the “DISPLAY” (center) button.
The display will indicate the current timer setting and will allow adjustment. Press the “+” or “-” buttons as
required to obtain the desired grind time. The interval will change slowly for the first second’s indication,
then speed-up for the next fifteen second’s indication, and increase very fast after that until it reaches the
limit on the scale. Set the timer for the desired amount of coffee to be ground.

5. Verify the setting by weighing a few samples. Use the chart on page 10 as an approximate guide only.

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10854 030300