G1, G2, G3 and G2 trifecta
®
Bulk Coffee Grinders
Bunn-O-Matic Corporation
Post Office Box 3227, Springfield, Illinois 62708-3227
Phone (217) 529-6601 | Fax (217) 529-6644
INSTALLATION & OPERATING GUIDE
For Technical Service, contact Bunn-O-Matic Corporation at 1-800-286-6070.
43254.0000 H 03/25 © 2010 - 2025 Bunn-O-Matic Corporation
www.bunn.com
2
Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows:
1) All coffee and tea dispensers/servers, MCR/MCP/MCA single cup brewers, and BUNNlink
®
electronic circuit and/or
control boards – 1 year parts and 1 year labor.
2) Product-specific warranties for Premia
™
,Crescendo
®
, Fast Cup
®
, Sure Immersion
®
, Sure Tamp
®
and others – 1 year
parts and 1 year labor. Please visit commercial.bunn.com/support/warranty-lookup for further details.
3) All other equipment – 2 years parts and 1 year labor plus added warranties as specified below:
a) Electronic circuit and/or control boards – parts and labor for 3 years.
b) Compressors on refrigeration equipment – 5 years parts and 1 year labor.
c) Grinding burrs on coffee grinding equipment for 4 years or 40,000 pounds of coffee, whichever comes first.
4) For customers subscribed to BUNNlink
®
, BUNN reserves the right to periodically auto-push critical software
updates that will enhance functionality or performance of the BUNN equipment, unless the customer requests
advance notice of such software updates from BUNN in writing.
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, non periodic cleaning and descaling, equipment failures
related to poor water quality, damage or casualty. In addition, the warranty does not apply to replacement of items
subject to normal wear with use including but not limited to user replaceable parts such as seals and gaskets. 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.
BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY
3
NORTH AMERICAN 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 5°C to 35°C.
• Appliance shall not be tilted more than 10° for safe operation.
• An electrician must provide electrical service as specified in conformance with all local and national codes.
• This appliance must not be cleaned by water jet.
• This appliance is not intended for use by persons (including children) with reduced physical, sensory
or mental capabilities, or lack of experience and knowledge, unless they have been given instructions
concerning use of this appliance by a person responsible for its safety.
• This appliance is intended to be used for commercial applications, for example in kitchens of
restaurants, canteens, hospitals and in commercial enterprises such as bakeries, butcheries, etc., but not
for continuous mass production of food.
• Children should be supervised to ensure they do not play with the appliance.
• If the power cord is ever damaged, it must be replaced by the manufacturer or authorized service
personnel with a special cord available from the manufacturer or its authorized service personnel in
order to avoid a hazard.
• Machine must not be immersed for cleaning.
• Machine rated IX P1.
• 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 41°F to 95°F
(5°C to 35°C).
• Appliance shall not be tilted more than 10° for safe operation.
• An electrician must provide electrical service as specified in conformance with all local and national codes.
• This appliance must not be cleaned by pressure washer.
• This appliance can be used by persons if they have been given supervision or instruction concerning use
of the appliance in a safe way and if they understand the hazards involved.
• Keep the appliance and its cord out of reach of children.
• Appliances can be used by persons with reduced physical, sensory or mental capabilities or lack of
experience and knowledge if they have been given supervision or instruction concerning use of the
appliance in a safe way and understand the hazards involved.
• If the power cord is ever damaged, it must be replaced by the manufacturer or authorized service
personnel with a special cord available from the manufacturer or its authorized service personnel in
order to avoid a hazard.
• Machine must not be immersed for cleaning.
• This appliance is intended for commercial use in applications such as:
– staff kitchen areas in shops, offices and other working environments
– by clients in hotel and motel lobbies and other similar types of environments
• Access to the service areas permitted by Authorized Service personnel only.
CE REQUIREMENTS
4
Carefully read and follow all notices on the equipment and in this manual. They were written for your
protection. All notices are to be kept in good condition. Replace any unreadable or damaged labels.
USER NOTICES
11075.0000
TURKISH
C
O
A
R
S
E
R
E
G
U
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A
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E
L
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K
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I
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A
U
T
O
-
D
R
I
P
F
I
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E
E
S
P
R
E
S
S
O
11075.0004
(SPECIAL)
SPECIAL
R
E
G
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L
A
R
E
L
E
C
P
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R
C
A
U
T
O
M
A
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I
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F
I
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E
E
S
P
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E
S
S
O
TURKISH
11075.0100
G2 trifecta
1
2
3
4
5
6
7
8
9
10
00824.0002
38903.0000
START
OFF/STOP
ON
37881.0000
To reduce the risk of electric shock,
do not remove or open cover.
No user-servi ceable parts inside.
Authorized service personnel only.
Disconnect power before servicing.
WARNING
11076.0000
WARNING
PERSONAL IN JURY HAZARD
ROTATING PARTS
Close Lid Before Grinding.
Keep Fingers and Foreign Objects
out of Hopper and Chute Opening.
Do Not Pour Groun d Coffee Back Into Grinder
20545.0000
WARNING
39956.0000 - G1
1. Select the desired grind.
2. Lift the lid and pour coffee beans into the hopper.
3. Slip bag under the chute. Rest the bag on the tray.
4. Press the start switch.
5. Flip the cleaning lever a few times as dispensing slows.
6. Remove the bag. The grinder will stop automatically.
STOP
START
39957.0000 - G2 & G3
5
INITIAL SETUP
CAUTION - Unplug the grinder throughout the initial setup.
1. Open the top lid. Clear all foreign objects and shipping materials from the hopper compartment and the
entrance to the grind chamber.
2. Install filler plate.
3. The grinder can now be plugged-in and put into service.
CAUTION - The grinder must be disconnected from the power source until specified in Initial Setup.
Refer to Data Plate on the Brewer, and local/national electrical codes to determine circuit
requirements.
NOTE: This electrical service consists of 2 current carrying conductors (L1 and Neutral) and a separate
conductor for chassis ground.
ELECTRICAL REQUIREMENTS
OPERATING CONTROLS
Grind Selector
Allows the user to vary the grind for each coffee. Each setting will provide precisely the same grind every
time it is selected.
Off/On/Start Switch
OFF/STOP - (upper position) Switching to this position stops the operation of the grinder.
ON - (center, resting 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 grinding only when a bag is in place
behind the chute or the brew cup is in place.
Bag/Brew Cup Sensor
Prevents the grinder from operating unless the back of a bag is in place behind the dispense chute or the
brew cup is not in place. Do not attempt to bypass this safety device.
Cleaning Lever
Allows the operator to clean out any coffee residue left from the previous grind.
100V & 120V
Models
230 VOLT
CE Model
6
CLEANING
6 Month Cleaning
Empty all beans from hopper(s). Plug in the grinder, place an empty bag behind the dispense chute or
trifecta brew cup. Press and release the “START” switch. Run a few cycles until all coffee in the grind
chamber is dispensed and disconnect the grinder from the power source. Remove the bag or brew cup.
WARNING - Prior to cleaning the grind chamber, unplug the grinder.
Weekly
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.
Bunn-O-Matic
®
Corporation recommends performing preventive maintenance at regular intervals.
Maintenance must be performed by a qualified technician. For technical service, contact
Bunn-O-Matic Corporation at 1-800-286-6070.
NOTE: The warranty does not cover parts or service caused by failure of required maintenance.
PREVENTIVE MAINTENANCE
Annually
1. Inspect and clean the grinding chamber.
2. Inspect and clean or replace burrs, if necessary.
3. Zero adjustment of burrs to maintain grind size accuracy.
1. Remove the two screws and remove the dial plate and selector knob assembly.
2. Slide the burr auger rotor/spring assembly off the motor shaft and disassemble for cleaning.
3. Remove the two screws securing the stationary burr to the grind chamber.
Inspect and clean/replace burrs if necessary.
4. Remove the four screws at the top of the chute and remove the chute. Use a stiff non-metallic bristle
brush to remove any debris around the flapper.
5. Wash all parts in a mild solution of detergent with hot water and a stiff non-metallic bristle brush. Rinse
all parts thoroughly and allow them to air dry before reinstalling.
6. Carefully clean the grind chamber, dial plate assembly, and chute opening with a dry stiff non-metallic
bristle brush. Wipe with a clean cloth that has been soaking in a mild solution of detergent and
hot water.
7. Reinstall the chute onto the burr housing. Reinstall the stationary burr to the grind chamber.
8. Reinstall the spring and outer burr onto the auger rotor. Align the slot in the motor shaft with the rotor
and reinstall shear plate. Reinstall rotor cup and grind selector dial plate to the burr housing. Refer to
the “BURR ADJUSTMENT” section to adjust burrs.
7
1. Disconnect the grinder from the power source.
2. Tip the machine gently, on its back, so it rests with approximately one inch of the bottom overhanging
the work surface.
3. Remove the drawer from the base assembly.
4. Place the base against the grinder bottom and align the four sets of holes.
5. Securely fasten the base to the grinder bottom using the four screws and washers provided.
6. Raise the grinder to the upright position.
7. Insert the drawer into the base assembly.
COFFEE GRINDING
1. Place a brew cup in place or an empty bag on the screen, with the back of the bag behind the
dispense chute.
2. Start the grinder to clear the grind chamber. Leave grinder “ON”.
3. Turn the Grind Selector knob to the “TURKISH” (or “1”) position.
4. Using a small flat blade screwdriver, loosen the two set screws on the left side of the grind
selector knob.
5. Hold the knob in the “TURKISH” (or “1”) position with one hand.
6. Using a large flat blade screwdriver, slowly turn the adjusting screw in the center of the grind
selector knob to the right (clockwise) until a metallic whine can be heard due to the rubbing
of the grinding burrs.
7. While holding the knob in the “TURKISH” (or “1”) position, back off the screw to the left
(counterclockwise) just until the metallic whine ceases.
8. Turn-off the grinder.
9. Push the knob against the dial plate and tighten both set screws on the left side of the grind
selector knob.
10. Turn the grinder on and listen again for the metallic whine with the grind selector knob in the
“TURKISH” (or “1”) position. If the metallic whine is heard, repeat steps 7 through 10 until the
sound ceases.
11. If no metallic whine is heard, the grinding burrs are adjusted properly. On trifecta models, you should
hear a slight chirp of the burrs contacting if you rotate the knob fully clockwise past the “1” position.
1. Turn the selector knob to align the arrow with the desired grind.
2. Raise the top lid and add the whole bean coffee. Close the top lid.
3. Locate the back of a bag behind the dispense chute or insert the brew cup.
(The grinder will not operate unless the bag/brew cup sensor is activated)
4. Allow the bag to rest on the screen beneath the chute.
5. Press the start switch.
6. Flip the cleaning lever a few times as dispensing slows.
7. Remove the bag or brew cup when ground coffee is no longer dispensed from the chute. The grinder
will stop automatically as the bag or brew cup is removed.
NOTE: For proper operation wait until the motor stops spinning before pressing the start switch to
begin the next grind sequence.
ADJUSTMENT
BASE RELOCATION
SCHEMATICS
WHI/VIO
WHI/VIO
WHI/BLU
WHI/ORA
SCHEMATIC WIRING DIAGRAM G1A HD, G2A HD & G3A HD
GRN/YEL
L1
L2
SW1
BLK
WHI/RED
WHI/RED
SW2
N.O.
N.O.
M
L1
L2
RED (230V)
RED/BLK (240V)
RED (230V)
RED/BLK (240V)
10754.0001 C 08/30/24 © 2011 BUNN-O-MATIC CORPORATION
K-4
K-6
K
1 or A 0 or B
K-2 or K-7
K-8 or K-9
EMI
FILTER
220-240 VAC
2 WIRE
SINGLE PHASE
50-60 Hz
WHI/VIO
WHI/VIO
WHI/BLU
WHI/ORA
1 or A
GRN or GRN/YEL
L1
N
SW1
BLK WHI/RED
SW2
K
0 or B
M
L1 L2
WHI
WHI
K-2 or K-7
K-8 or K-9
K-6
K-4
SCHEMATIC WIRING DIAGRAM G1, G2, G3, G2 trifecta
10190.0000 J 08/29/24 © 1985 BUNN-O-MATIC CORPORATION
100 VAC,50/60Hz
120 VAC,60Hz
2 WIRE
SINGLE PHASE
