Bunn G9-2T HD, G9-2 HD-S User Manual

OPERATING & SERVICE MANUAL

BUNN-O-MATIC CORPORATION

POST OFFICE BOX 3227

SPRINGFIELD, ILLINOIS 62708-3227

PHONE: [phone] FAX: [phone]

10218.0000R 05/03 ©1994 Bunn-O-Matic Corporation www.bunnomatic.com

CONTENTS

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

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

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

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

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

Initial Set-Up ............................................................................. 4

Cleaning .................................................................................... 5

Coffee Grinding ......................................................................... 5

Adjustments ..............................................................................6

Troubleshooting ........................................................................ 7

Service .................................................................................... 10

Wiring Diagram .......................................................................22

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.

BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY

Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows:

1) All equipment other than as specified below: 2 years parts and 1 year labor.

2) Electronic circuit and/or control boards: parts and labor for 3 years.

3) Compressors on refrigeration equipment: 5 years parts and 1 year labor.

4) Grinding burrs on coffee grinding equipment to grind coffee to meet original factory screen sieve analysis: parts and
labor for 3 years or 30,000 pounds of coffee, whichever comes first.
These warranty periods run from the date of installation BUNN warrants that the equipment manufactured by it will be
commercially free of defects in material and workmanship existing at the time of manufacture and appearing within the
applicable warranty period. This warranty does not apply to any equipment, component or part that was not manufactured
by BUNN or that, in BUNN’s judgment, has been affected by misuse, neglect, alteration, improper installation or operation,
improper maintenance or repair, damage or casualty. This warranty is conditioned on the Buyer 1) giving BUNN prompt
notice of any claim to be made under this warranty by telephone at [phone] or by writing to Post Office Box 3227,
Springfield, Illinois 62708-3227; 2) if requested by BUNN, shipping the defective equipment prepaid to an authorized
BUNN service location; and 3) receiving prior authorization from BUNN that the defective equipment is under warranty.

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.
If BUNN determines in its sole discretion that the equipment does not conform to the warranty, BUNN, at its exclusive
option while the equipment is under warranty, shall either 1) provide at no charge replacement parts and/or labor (during
the applicable parts and labor warranty periods specified above) to repair the defective components, provided that this
repair is done by a BUNN Authorized Service Representative; or 2) shall 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, AT BUNN’S 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.

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10218 051603

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.

#05942.0000

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ELECTRICAL REQUIREMENTS

This grinder has an attached cordset and requires 2-wire, grounded service rated 120 volts ac, 15 amp,
single phase, 60 Hz for 120V models and 230 volts ac, 10 amp single phase, 50 Hz for 230V models..

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 initiates a timed grind cycle.

Hopper Selector Switch

Left - Switching to this position allows beans to be dispensed from

the left hopper.

Right - Switching to this position allows beans to be dispensed

from the right hopper.

Batch Selector Switch (Optional)

Urn - Switching to this position allows the correct amount of beans

to be dispensed when grinding a large batch.

P633

beans to be dispensed when grinding a small batch.

CARAFE - Switching to this position allows the correct amount of

Dispense Timer

The dispense timer controls the amount of beans that will leave the hopper in a grind cycle. The timer can be
adjusted to dispense a different amount from each hopper. The scale is from 0.4 to 150.0 seconds. Refer to the
Adjustments section for timer setting chart (page 7).

INITIAL SET-UP

1. Open the top lid. Clear all foreign objects and shipping material from the hopper

compartment and the entrance to the grind chamber.

2. Remove the lower front inspection panel.

3. Plug-in the grinder.

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

the start switch.

5. If grinder has an analog timer, proceed to step 6. If grinder has a digital

timer, momentarily press the center (DISPLAY) button on the dispense timer

panel. The readout will indicate the present timer setting in seconds and will

remain displayed for five minutes.

6. Adjust the timer setting to obtain the desired amount of coffee for the se-

lected hopper.

7. Repeat steps 4 thru 6 for the other hopper.

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

for use.

P596

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10218 051603

CLEANING

The use of a damp cloth rinsed in any mild, non-abrasive, 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.

COFFEE GRINDING

P598P597 P599 P600 P601

STEP 1 STEP 2 STEP 3 STEP 4 STEPS 5 & 6

1. Visually inspect the selected 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 the start switch. 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.

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10218 091599

ADJUSTMENTS

The grind can be set from very fine to very coarse. The amount may be adjusted for use in most commercial

coffee brewers. The following procedures should be used to make adjustments. A change in the burr adjustment
will also change the amount dispensed. Any adjustment of the burrs should be followed by an adjustment of the
timer.

Burr Adjustment

1. Unplug the grinder and empty all beans from the hoppers.

2. Plug-in the grinder, momentarily press the off/on/start switch to the “START”
(lower) position (with either hopper selected) and release, run a few grind
cycles until all of the coffee in the grind chamber is used-up.

3. Remove the upper front inspection panel.

4. Early Models only, loosen the burr adjustment screw from its locked position.

5. Early Models only, hand loosen the adjustment locking nut around the screw
approximately one turn.

6. 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 noted in #7.

P581

P581

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.

9. Early Models only, hold the adjusting screw in its set position with a screwdriver while tightening the lock nut
to a snug position by hand. Slightly loosen the adjusting screw and retighten it to its prior position. The lock
nut should now be tight against the burr housing front cover.

Timer Adjustment

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.)

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ADJUSTMENTS (cont.)

3. Use the table on the next page to find approximate timer setting for the grind and amount of coffee desired.

4. Plug-in the grinder. Select either the right or left hopper with the selector switch. Do not press the start

switch.

5. If grinder has an analog timer, proceed to step 6. If grinder has a digital timer, momentarily press the center

(DISPLAY) button on the dispense timer panel. The readout will indicate the present timer setting in seconds
and will remain displayed for five minutes.

6. Adjust the timer setting to obtain the desired amount of coffee for the selected hopper.

7. Verify the setting by weighing a few samples. Use the following table as an approximate guide only.

8. Repeat steps 4 thru 7 for the other hopper.

APPROXIMATE TIMER SETTINGS IN SECONDS

Weight Fine Drip Regular
(ounces) (7*) (8*) (12*)

1.5 0.5 0.5 0.5

1.75 0.7 0.6 0.6

2.0 1.0 0.8 0.8

2.25 1.4 1.4 1.2

2.5 1.9 1.8 1.6

2.75 2.4 2.2 2.0

3.0 2.9 2.7 2.5

3.25 3.3 3.1 2.9

4.0 4.8 4.4 4.0

6.0 8.6 7.9 7.5

8.0 12.0 11.5 10.9

10.0 15.7 15.1 14.1

12.0 19.6 18.5 17.5

14.0 23.5 22.0 20.9

16.0 27.0 25.3 24.3

*Hash mark settings. Refer to

Adjustment-Burr

section.

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 ac voltage and dc voltage potential on their terminals. Shorting
of terminals or the application of external voltages may result in board failure.

• Intermittent operation of electronic circuit boards is unlikely. Board failure will normally be per­manent. If an intermittent condition is encountered, the cause will likely be a switch contact or a
loose connection at a terminal or crimp.

• Make certain that all electrical connections are tight and isolated.

WARNING

• Exercise extreme caution when servicing electrical equipment.

•Turn power OFF when servicing, except when electrical tests are specified.

• Follow recommended service procedures.

• Replace all protective shields or safety notices.

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10218 051603