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G9WD-RH
INSTALLATION & OPERATING GUIDE
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
To ensure you have the latest revision of the Operating Manual, or to view the Illustrated Parts
Catalog, Programming Manual, or Service Manual, 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. For Technical Service, contact Bunn-O-Matic Corporation at 1-800-286-6070.
41451.0001C 06/10 ©2009 Bunn-O-Matic Corporation
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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 (217) 529-6601 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.
AutoPOD, AXIOM, BrewLOGIC, BrewMETER, Brew Better Not Bitter, BrewWISE, BrewWIZARD, BUNN Espress, BUNN
Family Gourmet, BUNN Gourmet, BUNN Pour-O-Matic, BUNN, BUNN with the stylized red line, BUNNlink, Bunn-OMatic,
Bunn-O-Matic, BUNNserve, BUNNSERVE with the stylized wrench design, Cool Froth, DBC, Dr. Brew stylized Dr. design,
Dual, Easy Pour, EasyClear, EasyGard, FlavorGard, Gourmet Ice, Gourmet Juice, High Intensity, iMIX, Infusion Series,
Intellisteam, My Café, PowerLogic, Quality Beverage Equipment Worldwide, Safety-Fresh, savemycoffee.com, Scale-Pro,
Silver Series, Single, Smart Funnel, Smart Hopper, SmartWAVE, Soft Heat, SplashGard, The Mark of Quality in Beverage
Equipment Worldwide, ThermoFresh, 392, A Partner You Can Count On, Air Brew, Air Infusion, Beverage Bar Creator, Beverage Profit Calculator, Brew better, not bitter., BUNNSource, Coffee At Its Best, Cyclonic Heating System, Digital Brewer
Control, Nothing Brews Like a BUNN, Pouring Profits, Respect Earth, Respect Earth with the stylized leaf and coffee cherry
design, Signature Series, Tea At Its Best, Phase Brew, The Horizontal Red Line, Titan, trifecta, Ultra, Velocity Brew are
either trademarks or registered trademarks of Bunn-O-Matic Corporation.
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CONTENTS
KEEP FINGERS AND
FOREIGN OBJECTS
OUT OF HOPPER
OR CHUTE OPENING.
PERSONAL INJURY
HAZARD.
Introduction ........................................................................................................................................3
User Notices .......................................................................................................................................3
Electrical Requirements ......................................................................................................................4
Operating Controls ..............................................................................................................................4
Coffee Grinding ...................................................................................................................................5
Adjustments ........................................................................................................................................5
Cleaning ..............................................................................................................................................6
Glossary ..............................................................................................................................................7
Ground Counter ..................................................................................................................................8
Grinder Scale Calibration ....................................................................................................................8
Batch Size Setting ...............................................................................................................................8
Coffee Calibration ................................................................................................................................8
Communicating With The Grinder .......................................................................................................9
Troubleshooting ..................................................................................................................................13
Electrical Schematic ............................................................................................................................15
INTRODUCTION
This equipment will store up-to six pounds of whole bean coffee in the hopper 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.
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
00824.0000
USER NOTICES
#37881.0000
#20545.0000
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ELECTRICAL REQUIREMENTS
This grinder has an attached cord set and requires 2-wire, grounded service rated 120 volts ac, 15 amp,
single phase, 60 Hz.
OPERATING CONTROLS
d
e
c
b
a
Grind Pad (a)
Pressing initiates a grind cycle.
Stop Pad (b)
Pressing ends the operation of the grinder.
® Pad (c)
Pressing the copyright pad allows programming access.
Pads (d)
“Hidden” buttons used to navigate setup and programming menus.
Pads (e)
Press button to select small, medium or large batch size.
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COFFEE GRINDING
1. Visually inspect the 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 until it stops.
4. Select batch size desired (e).
5. Momentarily press the “START” switch (a). The grinding will begin after a moment. The actual weight of the
coffee being ground into the funnel will be shown on the display during grinding. The grinder will automatically stop when the correct weight is reached. DO NOT TOUCH THE FUNNEL OR FUNNEL HANDLE DURING
GRINDING. THIS WILL CAUSE THE INCORRECT WEIGHT OF COFFEE TO BE GROUND.
6. Remove the funnel from the grinder and level the bed of grounds by gently shaking.
7. The loaded funnel is now ready for use in any commercial drip coffee brewer according to the manufacturer’s instructions.
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.
Burr Adjustment
1. Unplug the grinder and remove the hopper by pulling forward with the handle.
2. Plug-in the grinder, place funnel with filter into the funnel rails. Momentarily press the “START” button and
release, run grind cycles until all of the coffee in the grind chamber is dispensed.
3. Remove two black screws from the lower control panel bezel.
4. Remove the control panel and hang the control panel on front of grinder by inserting metal tabs on the back
of control panel into slots on the front of grinder.
5. Make sure funnel with filter is still in place in the funnel rails. Go to the “GRIND MOTOR” menu under the
level 1 “SERVICE TOOL?” menu, and press the button under “ON” to start the motor. Slowly turn the adjusting screw in a clockwise direction until a metallic whine is heard due to the rubbing of the grinding burrs.
Reverse the adjusting screw just until the whining stops. Turn off the motor and exit to home screen.
6. Remove the white plastic cap, and replace it on the end of the grinder with the “0” aligned with the adjusting
screw slot.
7. The following settings approximately correspond to the CBC recognized grinds.
FINE GRIND: Rotate the adjusting screw to the “7” in a counterclockwise direction.
DRIP GRIND: Rotate the adjusting screw to the “8” in a counterclockwise direction.
REGULAR (COARSE) GRIND: Rotate the adjusting screw to the “12” counterclockwise direction.
NOTE: Exact adjustment will vary according to bean roast or added flavoring
8. Reinstall front control panel.
Tabs into slots on
front of grinder.
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CLEANING
WARNING – Unplug grinder before the removal of any panel or grind chamber-housing parts.
1. Clean all exterior surfaces using a damp cloth rinsed in any mild, nonabrasive, liquid detergent. Care should
be taken not to scratch the grinder with any abrasive material.
2. Remove the hopper by sliding all the way forward.
3. Remove the lid from the hopper, and empty of beans.
4. Clean and sanitize the hopper and lid. Care should be taken not to scratch the hoppers with any abrasive
material.
5. Place an empty funnel with filter in the funnel rails. Press and release the “GRIND” button. Run a few cycles
until all coffee in the grind chamber is dispensed and disconnect the grinder from the power source.
6. Remove the funnel and filter and discard any remaining coffee grounds.
7. Remove two black screws from the lower control panel bezel.
8. Remove the control panel and hang the control panel on front of grinder by inserting metal tabs on the back
of control panel into slots on the front of grinder.
9. Remove the two screws holding the front cover to the burr housing. Carefully remove the burr housing front
cover. Clean inside surface with a dry stiff non-metallic bristle brush and wipe with a dry clean cloth.
10. Carefully remove the rotor cup, shear plate, burr rotor and motor shaft extension from the grinder. Clean all
parts with a dry stiff non-metallic bristle brush and wipe with a dry clean cloth.
11. Clean the grind chamber with a dry stiff non-metallic bristle brush and wipe with a dry clean cloth.
12. Reinstall the motor shaft extension, burr rotor, shear plate, rotor cup and front cover to the burr housing.
13. Reinstall the front control panel.
14. Refer to the “Adjustment” section of the Operating and Service manual for burr adjustment.
15. Reinstall the cleaned hopper on the grinder.
Align rear of hopper
with rails for proper
installation.
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GLOSSARY
GRIND OZ: ##.##
(-) DONE (+)
SET GRIND TIME?
NO YES
GRIND SEC: #.#
(-) DONE (+)
3 BATCHES DONE?
NO YES
SERVICE TOOLS?
NO YES
TEST GRIND MOTOR
NO NEXT YES
Adjust current weight setting
using (-) and (+) buttons
Allows adjustment of current
time setting
Adjust current time setting using (-) and (+) buttons
Allows adjustment of other
batch sizes (multiple batch size
grinders only)
Test individual inputs and outputs
Allow selection of grinder motor test
CENTER SW TARE
OUNCES = #.##
EXIT TARE
TEST FREQUENCY?
NO YES
FACTORY DEFAILT?
NO YES
MACHINE TYPE?
WEIGHT TIMED
CALIBRATE SCALE?
NO YES
Allows present weight on scale
to be tared
Shows current weight on scale
Test read/write coils (BrewWISE enabled grinders only)
Resets all functions to factory
defaults
Select between weight based or
time based grinding
Allows calibration of scale
GRIND MOTOR
ON DONE OFF
TEST SWITCHES?
NO YES
PRESS RIGHT
HIDDEN TO EXIT
TEST SCALES?
NO YES
CALIBRATE COFFEE
NO YES
SWITCHES
ENABLE DISABLE
Turns grinder motor ON and
OFF
Allows selection of switch test
Pressing any switch will show
switch selected on screen
Allows selction of scale test
Set “offset” weght for coffee
name selected
Allows switches on control
panel to be disabled for servicing grinder
CALIBRATE SCALE
EXIT TARE
PLEASE WAIT
TARE
CALIBRATION OZ
(-) 8.00 (+)
PLEASE WAIT
CAL
MAX BIT SPREAD #
(-) DONE (+)
Pm Burr LBS #
RESET
Allows scale to be tared for
calibration
Displayed while scale is being
tared
Adjust weight be added for calibration
Displayed while scale is calibrating
Set maximum “offset” adjustment for grind
Shows total amount of coffee
which has been ground through
grinder
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GROUND COFFEE COUNTER
The grinder will keep a running total of the pounds of coffee the grinder has ground. This running total is
shown in the “PmBurrsLbs #” menu, under the “SERVICE TOOLS” menu. This running total can be used to
determine when the grinding burrs need cleaning or replacement. Pressing the button under “RESET” will reset
this total to zero.
GRINDER SCALE CALIBRATION
1. Place empty funnel into funnel rails.
2. Press and hold the right hidden (copyright) button until the “MACHINE TYPE” menu appears. (See level 2
programming)
3. Press the middle button under the screen until the “CALIBRATE SCALES?” menu appears.
4. Press the right button under “YES” in the “CALIBRATE SCALES?” screen.
5. Press the middle button under “TARE”.
6. When the “PLACE 8oz” screen appears, remove the funnel, and place a calibrated 8oz weight in the funnel.
Replace the funnel in the funnel rails.
7. Press the middle button under “DONE”. The grinder will go through a calibration, and then return to the
main screen when calibration is complete.
8. Remove the weight from the funnel. The grinder is now ready calibrated and ready for normal operation.
BATCH SIZE SETTING
1. Press and hold the right hidden, (copyright) button until the “REVIEW RECIPIES” menu appears. (See level
1 programming)
2. Press the button under “YES” and the “COFFEE NAME” screen appears.
3. Press the button under “NEXT” until the name of the coffee you wish to set the batch sizes for appears.
4. Press “MODIFY” under the screen containing the name of the coffee you wish to set the batch sizes for.
5. Using the buttons under (-) and (+), change the weight displayed to the new weight desired. Press a different batch size button to set the weight for that batch size. Press the button under “DONE” when complete.
6. In the “3 BATCHES DONE” menu, if no further changes are to be made, press the button under “YES” to exit
the “COFFEE CALIBRATION” menu.
COFFEE CALIBRATION
1. After the “3 BATCHES DONE” menu, press “YES” to enter the “COFFEE CALIBRATION” menu.
2. This menu sets the “offset” weight for the coffee name selected, so that accurate weight grinding will be
achieved.
3. With a funnel in place, press the “GRIND” button. After grinding, the coffee weight will be read and calibrated, and the “COFFEE NAME” “SETUP COMPLETE” menu will appear. Press the middle button to loop
back and select another coffee name for batch size setting and calibration.
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COMMUNICATING WITH THE GRINDER
Press the hidden
(copyright) button
for 1 second
Press right hidden
(copyright) button to
scroll to next screen
Press right hidden
(copyright) button to
scroll to next screen
Pressing “PREV” scrolls to
the previous coffee name
Pressing “NEXT” scrolls to
the next coffee name
Pressing “NEXT” scrolls
to the next coffee name
continue to (B)
continue to (A)
Press right hidden
(copyright) button to
scroll to next screen
Press right hidden
(copyright) button to
scroll to next screen
SET PASSWORD
0 0 0
ENTER PASSWORD
0 0 0
SELECT COFFEE
NO YES
REVIEW RECIPES?
NO YES
ENTER ASSET #
0 0 0
SERVICE TOOLS?
NO YES
SMALL BATCH
GRIND oz #.##
“COFFEE NAME”
MODIFY SHOW NEXT
“COFFEE NAME”
PREV DONE NEXT
MEDIUM BATCH
GRIND oz #.##
LARGE BATCH
GRIND oz #.##
COFFE CAL # ##
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COMMUNICATING WITH THE GRINDER (Continued)
From previous
page
Loop back to
“COFFEE NAME”
Press “GRIND” button to
start coffee calibration
The small batch size will
flash, press (-) or (+) to
adjust grind weight. After
first batch size is set,
additional batch sizes can
be set by pressing appropriate
batch size button. Press “DONE”
after all three batch sizes
have been set.
FINISHED, returns
to main screen
from (A)
FACTORY DEFAULT
NO YES
CALIBRATE COFFEE
NO ? YES
THREE BATCHES DONE
NO YES
“COFFEE NAME”
SETUP COMPLETE
GRIND oz #.##
(-) DONE (+)
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COMMUNICATING WITH THE GRINDER (Continued)
Pressing any switch in this
mode will display the switch
name in the grinder display.
After the funnel is “tared”
add a calibrated weight
to check scale.
return to
“FACTORY DEFAULTS”
screen
TEST FREQUENCY ?
NO YES
TEST SWITCHES ?
NO YES
TEST GRIND MOTOR
NO YES
TEST SCALE ?
NO YES
SWITCHES
ENABL DISABLE
PmBurrLBS #
RESET
CENTER SW TARE
PRESS RIGHT
HIDDEN TO EXIT
GRIND MOTOR
ON NEXT OFF
PLEASE WAIT
TARE
SENSOR BITS ####
Weight ##oz
from (B)
TEST OUTPUTS
NO YES
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COMMUNICATING WITH THE GRINDER (Continued)
Press the hidden
(copyright) button for
3 seconds in “ENTER
PASSWORD” menu.
Finished, returns
to main screen
MODIFY MAXBIT
NO SPREAD? YES
CALIBRATE SCALE ?
NO YES
MACHINE TYPE
WEIGHT TIMED
SHUToff Bits ##
(-) DONE (+)
MaxBits read #
(-) DONE (+)
PLEASE WAIT
CAL
PLACE 8.00 oz
EXIT DONE
PLEASE WAIT
TARE
CALIBRATE SCALES
EXIT TARE
CALIBRATION OZ
(-) 8.00 (+)
LEVEL 2 FUNCTIONS:
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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,testingandrepairofelectricalequipmentshouldbeperformedonlybyqualiedserviceperson-
nel.
• Allelectroniccomponentshave120voltsacandlowvoltagedcpotentialontheirterminals.Shortingof
terminals or the application of external voltage may result in board failure.
• Intermittentoperationofelectroniccircuitboardsisunlikely.Boardfailurewillnormallybepermanent.Of
an intermittent condition is encountered, the cause will likely be a switch contact or a loose connection at a
terminal or crimp.
• Makecertainthatallelectricalconnectionsaretightandisolated.
WARNING
• Exerciseextremecautionwhenservicingelectricalequipment.
• TurnpowerOFFwhenservicing,exceptwhenelectricaltestsarespecied.
• Followrecommendedserviceprocedures.
• Replaceallprotectiveshieldsorsafetynotices.
Problem Probable Cause Remedy
Grinder will not start 1. Motor overload protector
Remove the metal plug located
on the right side of the housing.
Press the red “Reset” button. Listen carefully for a “click”. This resets the motor protection circuit
and indicates that the motor may
have encountered an overload. (An
overload can occur when something other than coffee is inserted
into the hopper for grinding)
2. No power
3. START button
4. Circuit board
13
Check the voltage at the power cord
with a voltmeter. Voltage must be
120 volts across the black and
white wires.
Use “TEST SWITCHES?” menu
under “SERVICE TOOLS?” menu
in level 1 functions to test START
button.
Circuit board. Check that there is
24VDC to the relay coil when the
Start button is pressed.
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TROUBLESHOOTING (Continued)
Problem Probable Cause Remedy
Grinder will not start (continued)
5. Relay
Check that relay contacts close
when start switch is pressed.
Grinder will not shut off
Incorrect weight of coffee dispensed
6. Motor
1. STOP button
2. Relay
1. Grinder scale requires calibration.
2. Funnel handle touched during
grinding.
With a voltmeter, check that 120
volts AC is present across L1 and
L2 on the rear of the motor when
the Start switch is pressed. If voltage is present, and motor does not
start, replace motor.
Use “TEST SWITCHES?” menu under “SERVICE TOOLS?” menu in
level 1 functions to test STOP button.
With power removed from the machine, check that there is no continuity across the relay contacts.
Refer to GRINDER WEIGHT CALIBRATION procedure.
Do not touch funnel or funnel handle during grinding operation.
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BLK WHT
RED
RED
VIO
BLK BLK
VIOVIO
K1 N.O.
M
K1
BLK
WHT
L1 N
L1 L2
1 4
J1
CONTROL CIRCUIT BOARD
LOAD
TRANSDUCER
BLK
GRN
WHT
RED
1
4
J7
GRN
SCHEMATIC WIRING DIAGRAM G9WD-RH
120 VOLTS AC
2 WIRE
SINGLE PHASE
60 HZ
BLK
VIO
T1
LINE
LOAD
WHTBLK
RED
RED
1 2
4 5
YEL
YEL
BLK
WHT
J13
1 5 10 16
BUTTON
BUTTON
FUNNEL
BrewWISE Models only
SENSOR
J12
1 5
VIO9VIO
41449.0000A 11/09 © 2009 BUNN-O-MATIC CORPORATION
A1 GRIND
A2 STOP
B1 HIDDEN BUTTON "LEFT"
B2 HIDDEN BUTTON "RIGHT"
C1 LARGE BATCH SIZE "LEFT"
C2 MEDIUM BATCH SIZE "LEFT"
C3 SMALL BATCH SIZE "LEFT"
D1 "DIGITAL' LEFT HIDDEN BUTTON
D2 "BREWER" CENTER HIDDEN
D3 "CONTROL" RIGHT HIDDEN
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41451.0001 111909
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