Bunn BrewWise DBC, BrewWise DBC Series Service Manual

BrewWISE

DBC

®

®

BREWERS

WITH SMART FUNNEL

®

SERVICE & REPAIR MANUAL

BUNN-O-MATIC CORPORATION

PHONE: [phone] FAX: [phone]

41746.0000D 04/10 ©2008 Bunn-O-Matic Corporation

POST OFFICE BOX 3227

SPRINGFIELD, ILLINOIS 62708-3227

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.

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.

Page 2

41746 041410

TABLE OF CONTENTS

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

Table of Contents ........................................................................................................................3

Troubleshooting ..........................................................................................................................4

Service Tools .............................................................................................................................15

Component Access ...................................................................................................................19

Control Board ......................................................................................................................19

Membrane Switch ................................................................................................................20

Dispense and Bypass Valves................................................................................................21

Refill Valves .........................................................................................................................22

Tank Heaters ........................................................................................................................24

Temperature Probe ..............................................................................................................25

Limit Thermostats ...............................................................................................................25

Warmer Elements ................................................................................................................26

Master Power Switch ...........................................................................................................26

SH Server Timer ..................................................................................................................27

Schematic (Wiring Diagram) .....................................................................................................28

Page 3

41746 040210

TROUBLESHOOTING

OVERFLOW CUP

FULL. EMPTY CUP

SERVER NOT

IN PLACE

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 qualied

service personnel.

 • Allelectroniccomponentshave120-240voltacandlowvoltagedc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per-

manent. If an intermittent condition is encountered, the cause will likely be a switch contact or
a loose connection at a terminal or crimp.

 • Solenoidremovalrequiresinterruptingthewatersupplytothevalve.Damagemayresultifsole-

noids are energized for more than ten minutes without a supply of water.

 • Theuseoftwowrenchesisrecommendedwheneverplumbingttingsaretightenedorloosened.

This will help avoid twists and kinks in the tubing.

 • Makecertainthatallplumbingconnectionsaresealedandelectricalconnectionstightandiso-

lated.

 • Thisbrewerisheatedatalltimes.Keepawayfromcombustibles.

WARNING

 • Exerciseextremecautionwhenservicingelectricalequipment.
 • Disconnectthebrewerfromthepowersourcewhenservicing,exceptwhenelectricaltestsare

specified.

 • Followrecommendedserviceprocedures.
 • Replaceallprotectiveshieldsorsafetynotices.

Screen Displayed

(SH Models only)

Possible Cause

1. Overflow cup is full of water. This
could be caused by boiling. Refer to
SET TEMP and REFILL sections in
Programming Manual.

1. Soft Heat Server not correctly
positioned on base.

2. Not using a Soft Heat Server, and
the SERVER DETECT function is
activated (on).

Troubleshooting Procedures

Empty cup. Correct cause and
retry.

Position the server so that the con­nector pins on the server make con­tact with connector on the brewer.

Disable the SERVER DETECT func­tion.

Page 4

41746 112008

TROUBLESHOOTING (cont.)

NO FUNNEL

PRESENT

TEMPERATURE

TOO LOW

CHECK FUNNEL

FOR FRESH COFFEE

PRESS BREW

TO BREW ANYWAY

TO CANCEL

PRESS ON/OFF

TO FINISH:

PRESS BREW

BREW STOPPED!

FUNNEL REMOVED?

Screen Displayed

Possible Cause Troubleshooting Procedures

1. SMART FUNNEL not fully inserted
into the funnel rails.

2. Not using a SMART FUNNEL,
and the FUNNEL DETECT function
is activated (on).

1. Water temperature in the tank
does not meet the SET READY

TEMPERATURE.

1. Brew funnel was not removed
after the previous brew cycle was
finished.

Position the funnel so that the sensor
is directly beneath the sensor coil on
the brewer.

Disable the FUNNEL DETECT func­tion.

(a) Wait for the brewer to heat to the
proper temperature.

(b) Disable the BREW LOCKOUT
function.

Remove funnel, check contents, and
insert back into the funnel rails.

OR

1. Brew funnel was moved out of
position after the brew cycle was
started.

Press BREW to start a brew cycle
without removing the funnel.

To resume brewing, correctly posi­tion the funnel and press BREW
again. The brew cycle will resume
from the point it was interrupted.

OR

Press ON/OFF to terminate the
cycle.

Page 5

41746 112008

TROUBLESHOOTING (cont.)

TO CANCEL

PRESS ON/OFF

TO FINISH:

PRESS BREW

BREW STOPPED!

SERVER REMOVED?

TO CANCEL

PRESS ON/OFF

TO FINISH:

PRESS BREW

BREW STOPPED!

IS SWITCH OFF?

CHECK HEATING

CIRCUIT

HEATING TIME

TOO LONG

Screen Displayed

1. Soft Heat Server was moved out
of position after the brew cycle was
started.

1. ON/OFF switch was pressed after
the brew cycle was started.

Troubleshooting ProceduresPossible Cause

To resume brewing, correctly
position the Soft Heat Server and
press BREW again. The brew cycle
resumes from the point it was inter­rupted.

OR

Press ON/OFF to terminate the brew
cycle.

To resume brewing, press BREW
again. The brew cycle resumes form
the point it was interrupted.

1. Tank Heater failure

2. Triac Failure

3. Control Board/Thermistor failure

OR

Press ON/OFF to terminate the brew
cycle.

Service Required. See TANK HEAT-

ERS.

Service Required. See

Service Required. See CONTROL

BOARD

Page 6

41746 112008

TROUBLESHOOTING (cont.)

CHECK WATER

SUPPLY

FILL TIME TOO

LONG

CHECK FOR BAD

CONNECTIONS

TEMP SENSOR

OUT OF RANGE

CHECK WIRE FOR

SHORTS

TEMP SENSOR

OUT OF RANGE

Screen Displayed

1. Water shut off to brewer

2. Inlet Solenoid Valve failure

3. Control Board Failure

1. Temperature Sensor Probe wire(s)
broken or not making connection.

Troubleshooting ProceduresPossible Cause

Check water supply shut-off

Service required. See REFILL
VALVE.

Service required. See CONTROL
BOARD.

Check wire and connection of both
black and white wires of temperature
probe.

1. Temperature Sensor Probe
wire(s) shorted to housing, or to
each other.

Check to confirm that wire(s) are
not pinched between two surfaces
or connected to each other.

Page 7

41746 112008

TROUBLESHOOTING (cont.)

Problem

Equipment will not operate.

Brew cycle will not start.

Possible Cause

1. No power or incorrect voltage.

1. No water

2. ON/OFF switch

3. Brew switch

4. Brew Valve

Troubleshooting Procedure

Measure the voltage at the terminal
block and confirm that it matches
the voltage specified on the brewer
data plate within +/- 10%.

Check plumbing and shut-off
valves

Test the ON/OFF switch. Refer to the
switch test procedures in SERVICE
TOOLS section.

Test the BREW switch. Refer to the
switch test procedures in SERVICE
TOOLS section.

Test the Brew valve. Refer to Testing

Individual Components in SERVICE
TOOLS section.

Automatic refill will not operate
or display shows FILL TIME TOO
LONG

5. Electronic Control Board

1. No water

2. Water strainer/flow control
(.750 GPM)

Substitute a control board known to
be in good working order.

Check plumbing and shut-off
valves.

(A) Direction of flow arrow must be
pointing towards direction of water
flow.

(B) Remove the strainer/flow control
and check for obstructions. Clear or
replace.

Page 8

41746 112008

TROUBLESHOOTING (cont.)

Problem

Automatic refill will not operate or

display shows FILL TIME TOO LONG

(cont.)

Possible Cause

3. Refill Probe or Sensitivity Set­ting

Troubleshooting Procedure

Check the sensitivity setting. Refer to
Refill function. If the left three digit
number is less than the right number,
the machine “thinks” it is full and the
refill valve should be off. If the left
number is larger than the right, then
the refill valve will automatically be
turned on to fill the tank. The right
number is the threshold setting and
can be adjusted to compensate for
extreme water conditions: very pure,
low conductance water requires a
higher setting, while high mineral
content, high conductance water
requires a lower setting. Note that
the left number changes from a high
value when water is NOT touching
the refill probe to a low value when
water IS touching the probe. For best
operation, the right number should
be set to a value midway between
these low and high numbers. Before
changing the setting, confirm that the
refill probe is free of scale buildup
and the connection to it is secure.

Water flows into tank continuously

with power removed from brewer.

4. Refill Valve

5. Overflow Protection Switch

6. Electronic Control Board

1. Refill valve

Page 9

Test the Refill valve. Refer to Testing
Individual Components.

When this condition occurs, the
brewer will display OVERFLOW CUP
FULL. EMPTY CUP. The reason for
overfilling could be a defective refill
valve, an incorrect sensitivity setting,
(see above) or boiling.

Substitute a control board known to
be in good working order.

Foreign material lodged in valve,
holding it in open state.

41746 112008

TROUBLESHOOTING (cont.)

Power

Water flows into tank continuously
with power applied to brewer.

Possible Cause

1. Refill Probe or Sensitivity Set­ting

Troubleshooting Procedures

Check the sensitivity setting. Refer to
Refill function. If the left three digit
number is less than the right number,
the machine “thinks” it is full and the
refill valve should be off. If the left
number is larger than the right, then
the refill valve will automatically be
turned on to fill the tank. The right
number is the threshold setting and
can be adjusted to compensate for
extreme water conditions: very pure,
low conductance water requires a
higher setting, while high mineral
content, high conductance water
requires a lower setting. Note that
the left number changes from a high
value when water is NOT touching
the refill probe to a low value when
water IS touching the probe. For best
operation, the right number should
be set to a value midway between
these low and high numbers. Before
changing the setting, confirm that the
refill probe is free of scale buildup
and the connection to it is secure.

Water will not heat or display shows
HEATING TIME TOO LONG

2. Electronic Control Board

1. Limit Thermostat

CAUTION - Do not eliminate or
bypass limit thermostat. Use only
replacement part #23717.0003.

2. Tank Heaters

Page 10

Substitute a control board known to
be in good working order.

Remove power from the brewer.
Press reset button on limit ther­mostat. Then check for continuity
through it.

Remove power from the brewer.
Check for continuity through the
tank heaters.

41746 112008

TROUBLESHOOTING (cont.)

Problem

Water will not heat or display shows

HEATING TIME TOO LONG (cont.)

Possible Cause

3. Triac

4. Electronic Control Board

Troubleshooting Procedures

Remove power from the brewer.
Connect a voltmeter across one of
the tank heaters. Reapply power
to the brewer and refer to Testing
Individual Components. If the full
supply voltage is measured when
the tank heater is turned on, and
zero voltage is measured with the
triac off, then the triac is good. If
half the supply voltage is measured,
the triac is defective. If very low, or
zero voltage is measured, there could
be a defective triac or a defective
control board.

Perform the above procedure for
testing triacs. If the voltage mea­sured is very low or zero, then
substitute a control board known to
be in good working order.

Spitting or unusual steaming from

sprayhead or air vents. (Water too

hot)

1. Triac

2. Lime Buildup

CAUTION - Tank and tank compo­nents should be delimed regularly
depending on local water condi­tions. Excessive mineral buildup on
stainless steel surfaces can initiate
corrosive reactions resulting in seri­ous leaks.

Remove power from the brewer.
Connect a voltmeter across one of
the tank heaters. Reapply power
to the brewer and refer to Testing
Individual Components. If the full
supply voltage is measured when
the tank heater is turned on, and
zero voltage is measured with the
triac off, then the triac is good. If
half the supply voltage is measured,
the triac is defective. If very low, or
zero voltage is measured, there could
be a defective triac or a defective
control board.

Inspect the tank assembly for ex­cessive lime deposits. Delime as
required.

Page 11

41746 112008

TROUBLESHOOTING (cont.)

Problem

Spitting or unusual steaming from
sprayhead or air vents. (Water too
hot) (cont.)

Inconsistent beverage level in
server.

Possible Cause

3. Electronic control board

1. Strainer/flow control (.750
GPM)

2. Improper water pressure

3. Brew Valve

Troubleshooting Procedures

Perform the previous procedure
for testing triacs. If the voltage
measured is very low or zero, then
substitute a control board known to
be in good working order.

(A) Direction of flow arrow must be
pointing towards the brewer.

(B) Remove the strainer/flow control
and check for obstructions. Clear or
replace.

Check operating water pressure to
the brewer. It must be between 20
and 90 psi (138 and 620 kPa).

Test the Brew Valve. Refer to Testing
Individual Components. Turn the
valve on for 30 seconds and collect
the water dispensed from the spray­head. Repeat the test several times
to confirm a consistent volume of
dispensed water. If not consistent,
check the valve, tubing and spray­head for lime buildup.

4. Bypass Valve

5. Lime buildup

Page 12

If bypass is being used on the
inconsistent brewing recipe, test
the Bypass Valve. Refer to Testing
Individual Components. Turn the
valve on for 30 seconds and collect
the water collected from the bypass
opening. Repeat the test several
times to confirm a consistent volume
of dispensed water. If not consistent,
check the valve, tubing and bypass
opening for lime buildup.

Inspect for lime buildup that could
block the tank, tank fittings, tubing,
valves and sprayhead.

41746 112008

TROUBLESHOOTING (cont.)

Problem Possible Cause

Consistently high or low beverage

1. Brew Volume adjustment

level in server.

Dripping from sprayhead.

Water overflows filter.

1. Brew Valve

1. Type of paper filters

2. No sprayhead

Beverage overflows server.

1. Beverage left in server from previ­ous brew

2. Brew Volume adjustment

Troubleshooting Procedures

Adjust the brew volume as required
to achieve the recommended volume
for each brew cycle.

Repair or replace leaky valve.

BUNN paper filters should be used
for proper extraction.

Check sprayhead

The brew cycle should be started
only with an empty server under
the funnel.

Adjust the brew volume as required
to achieve the recommended volume
for each brew cycle.

Weak beverage.

1. Type of paper filters

2. Coffee

3. Sprayhead

4. Funnel Loading

5. Water temperature

BUNN paper filters should be used
for proper extraction.

A sufficient quantity of fresh drip
or regular grind should be used for
proper extraction.

The correct B.O.M. sprayhead should
be used to properly wet the bed of
ground coffee in the funnel.

The BUNN paper filter should be
centered in the funnel and the bed
of ground coffee leveled by gentle
shaking.

Empty the server, remove its cover,
and place the server beneath the
sprayhead. Place empty funnel over
the server entrance, with ON/OFF
switch in the "ON" position press
the start switch and release it. Check
the water temperature immediately
below the sprayhead with a ther­mometer. The reading should not
be less than 195˚F (91˚C).

Page 13

41746 112008

TROUBLESHOOTING (cont.)

Problem

Weak beverage (cont.)

Brewer is making unusual noises.

Possible Cause Troubleshooting Procedures

6. Incorrect Recipe

Consider adjusting bypass percent­age, preinfusion, or pulse brew.
Contact Bunn-O-Matic for sugges­tions.

1. Solenoid (Inlet)

The nut on back of the solenoid
must be tight or it will vibrate during
operation

2. Plumbing lines

Plumbing lines should not be resting
on the counter top.

3. Water Supply

(A) The brewer must be connected
to a cold water line.

(B) Water pressure to the brewer
must not be higher than 90 psi (620
kPa). Install a regulator if necessary
to lower the working pressure to ap­proximately 50 psi (345 kPa).

4. Tank Heaters.

Remove and clean lime off tank
heaters.

Page 14

41746 112008

TROUBLESHOOTING (cont.)

SERVICE TOOLS

This function allows the testing of individual com-

ponents and the ability to check switches for proper

function. This function also tests the Soft Heat server's

status on the brewer (in place or removed), and the

funnel sensor coil's frequency (diagnostic tool for

troubleshooting purposes only).

Testing individual components (outputs):

This will allow the operator to test the operation

of individual components and outputs of the brewer.

The components that can be individually tested are as

follows:

SINGLE Brewers

Brew Valve

Bypass Valve

Funnel Lock (Optional)

Server (SH models only)

Refill Valve

Tank Heaters

Heater Contactor

DUAL Brewers

Left Brew Valve

Left Bypass

Left Funnel Lock (Optional)

Left Server (SH models only)

Right Brew Valve

Right Bypass

Right Funel Lock (Optional)

Right Server (SH models only)

Refill Valve

Tank Heaters

Heater Contactor

Procedure to test components (outputs):

1. Place brew funnel(s) into rails on the brewer (both
sides on DUAL brewers).

2. Place server(s) beneath the brew funnel(s).

3. Press and hold the upper right hidden switch until
display reads UNITS. Release the switch. Continue
to press and release switch until SERVICE TOOLS
appears.

4. Press YES to run tests on various components
and outputs within the brewer. Pressing NO will
exit this function and advance to next function
screen.

5. The display should read TEST OUTPUTS.

Page 15

6. Press and release YES. The display should read:
BREW VALVE on SINGLE brewers

LEFT BREW VALVE on DUAL brewers.

7. To test BREW VALVE, press ON. If the brew valve
is functional, water should run from the brewer
(left side on DUAL brewers)

8. Press OFF to end flow of water.

9. Press NEXT to advance to the next component to
be tested.

NOTE: To bypass testing any component, press NEXT
to advance to the next one, without testing the previ­ous component.

10. To test BREW BYPASS on SINGLE brewers or LEFT
BREW BYPASS on DUAL brewers, press ON. If the
bypass valve is functional, water should run from
the brew bypass (left side on DUAL brewers).

11. Press OFF to end flow of water.

12. Press NEXT to advance to the next component to
be tested.

13. To test FUNNEL LOCK on SINGLE brewers or LEFT
FUNNEL LOCK on DUAL brewers, press ON. If the
funnel lock is functional, the lock will come down
to hold the funnel in place.

14. Press OFF to retract the funnel lock.

15. Press NEXT to advance to the next component to
be tested.

16. (SH models only) To test SERVER on SINGLE
brewers or LEFT SERVER on DUAL brewers, press
ON. If the server and the sensor are functional, the
light on the lower right corner of the server will
illuminate.

17. Press OFF to end testing of server.

18. Press NEXT to advance to the next component to
be tested.

19. For DUAL brewers, follow steps 7 through 16 to
test the right side components.

20. To test REFILL VALVE, press ON. If the refill valve
is functional, the sound of the valve operating will
be heard.

21. Press OFF to end testing of refill valve.

22. Press NEXT to advance to the next component to
be tested.

23. To test TANK HEATERS, connect a voltmeter across
each of the tank heaters to check for voltage.

24. Press ON. The correct voltage should be present
at the heater terminals.

25. Press OFF to end testing of the tank heaters.

41746 112008

TROUBLESHOOTING (cont.)

SERVICE TOOLS (cont.)

SERVICE TOOLS?
NO YES

EXIT TO

NEXT FUNCTION

SCREEN

TEST OUTPUTS?

NO YES

TEST SERVERS?

NO YES

TEST FREQUENCY?

NO YES

TEST SWITCHES?
NO YES

NOTHING PRESSED

SINGLE

BREWERS

SERVER REMOVED

DUAL

BREWERS

<- SERVER REMOVED

PRESS AND RELEASE

® SYMBOL

SINGLE

BREWERS

PRESS AND RELEASE

® SYMBO L

IN PLACE ->

SINGLE

BREWERS

BREW VALVE

ON NEXT OFF

BYPASS

ON NEXT OFF

FUNNEL LOCK

ON NEXT OFF

SERVER

ON NEXT OFF

REFILL VALVE

ON NEXT OFF

DUAL

BREWERS

LEFT BREW VALVE

ON NEXT OFF

LEFT BYPASS

ON NEXT OFF

LEFT FUNNEL LOCK

ON NEXT OFF

LEFT SERVER

ON NEXT OFF

RIGHT BREW VALVE

ON NEXT OFF

DUAL

BREWERS

<-<-<- 125.0 KHZ. 4

4 125.0 KHZ ->->->

EXIT TO

NEXT FUNCTION

SCREEN

PRESS AND RELEASE

125.0 KHZ. 4

® SYMBOL

Page 16

TANK HEATRS

ON NEXT OFF

HEATER CONTACTOR

ON NEXT OFF

RIGHT BYPASS

ON NEXT OFF

RIGHT FUNEL LOCK

ON NEXT OFF

RIGHT SERVER

ON NEXT OFF

41746 112008

TROUBLESHOOTING (cont.)

SERVICE TOOLS (cont.)

NOTE: The tank heater will automatically turn off if

left on too long.

26. After testing the tank heater, press NEXT to advance
to the next test.

27. The HEATER CONTACTOR is used only on certain
models. Check the machine schematic to see if the
contactor is present. Connect a voltmeter across a
tank heater that is operated by the contactor and
press ON to check that correct voltage is present.
Press OFF and confirm the voltage is zero.

28. Press NEXT to return to TEST OUTPUTS.

29. To exit SERVICE TOOLS, press and release the
ON/OFF switch (either on DUAL brewers) located
on the front switch panel. This will return to the

MAIN SCREEN.

Procedure to test switches:
This function allows the operator to test the opera-

tion of the individual switches on the front panel.

1. Place brew funnel(s) into rails on the brewer (both
sides on DUAL brewers).

2. Place server(s) beneath the brew funnel(s).

3. Press and hold the upper right hidden switch until
display reads UNITS. Release the switch. Continue
to press and release switch until SERVICE TOOLS
appears.

4. Press YES to run tests on various components
and outputs within the brewer. (Pressing NO will
exit this function and advance to the next function
screen.)

5. The display should read TEST OUTPUTS.

6. In TEST OUTPUTS screen, press NO. This advances
to TEST SWITCHES.

7. Pressing NO in this screen will advance to the
next function. Press YES in the TEST SWITCHES
screen to test the switches. The display will read
NOTHING PRESSED.

8. From this screen, press any of the switches on the
front of the brewer except the upper right hidden
switch. While the switch is pressed, the display
shows the name of that switch. If the name does
not appear, or if it remains after the switch has been
released, the switch is defective. Each switch can
be tested in this manner.

9. After all switches have been tested, press and re­lease the right hidden switch (®). This will return

Page 17

to TEST SWITCHES?. Press and release switch
again to advance to TEST SERVERS?. Another
alternative is to press and release the ON/OFF
switch (either on DUAL brewers) located on the
front switch panel. This will exit TEST SWITCHES
and return to the MAIN SCREEN.

Procedures to test servers: (SH models only)
This function allows the operator to test the opera-

tion of the Soft Heat servers. It will also show if the
server is correctly placed on the brewer stand.

1. Place brew funnel(s) into rails on the brewer (both
sides on DUAL brewers).

2. Place a Soft Heat server(s) beneath the brew
funnel(s).

3. Press and hold the upper right hidden switch until
the display reads UNITS. Release the switch. Con-
tinue to press and release switch until SERVICE
TOOLS? appears.

4. Pressing NO will exit this function and advance to
the next function screen. Press YES to run tests
on various components and outputs within the
brewer.

5. The display should read TEST OUTPUTS?

6. In TEST OUTPUTS screen, press NO. This ad­vances to TEST SWITCHES?. Press and release

NO once more. The display should now read TEST
SERVER(S)?

7. Press YES in the TEST SERVER(S) screen to show
if a server is in place. The display should read IN
PLACE (with arrows pointing to the left and right
on DUAL brewers).

8. Lift and pull both Soft Heat servers forward about
2 inches so that the two contacts on each server
do not touch the two contacts on the brewer.

9. The display should then read SERVER REMOVED
(with arrows pointing to the left and right on DUAL
brewers).

10. After the server(s) have been tested, press and re­lease the ON/OFF switch (either on DUAL brewers)
located on the front switch panel. This will exit TEST

SERVERS and return to the MAIN SCREEN.

Procedures to test coil frequency:

1. Place brew funnel(s) into rails on the brewer (both
sides on DUAL brewers).

2. Place server(s) beneath the brew funnel(s).

41746 112008

TROUBLESHOOTING (cont.)

SERVICE TOOLS (cont.)

3. Press and hold the upper right hidden switch until
the display reads UNITS. Release the switch.
Continue pressing and releasing the upper right
hidden switch until SERVICE TOOLS appears.

4. Pressing NO will exit this function and advance to
the next function screen. Press YES to run tests
on various components and outputs within the
brewer.

5. The display should read TEST OUTPUTS?.

6. In TEST OUTPUTS screen, press NO. Continue
to press and release NO until the display reads

TEST FREQUENCY?.

7. Press and release YES. The display will show the
frequency of the sensor coil circuits. This is for
diagnostic service use when troubleshooting this
circuit.

8. After the coils have been tested, press and release
the ON/OFF switch (either on DUAL brewers)
located on the front switch panel. This will exit
the TEST FREQUENCY function and return to the

MAIN SCREEN.

NOTE: If the operator wishes to test more than one

function in the SERVICE TOOLS section (outputs,
switches, servers, or coil frequency), it is not
necessary to exit the program. Use the flow chart
for SERVICE TOOLS to navigate to a particular
function.

Page 18

41746 112008

COMPONENT ACCESS

This section provides procedures for testing and
replacing various major components used in this
brewer should service become necessary. Refer to
Troubleshooting for assistance in determining the
cause of any problem.

If no voltage is present, check wiring to the board.
If voltage is present, and brewer does not power on,
replace board.

WARNING - Inspection, testing, and repair of electri-

cal equipment should be performed only by qualified
service personnel. The brewer should be disconnected
from power source when servicing, except when
electrical tests are required and the test procedure
specifically states to plug in the brewer.

WARNING - Disconnect the brewer from the power
source before the removal of any panel or the replace­ment of any component.

All components are accessible by the removal of
the top cover, front access panel and platform cover.

Refer to wiring diagrams at the back of this manual
when reconnecting wires.

CONTROL BOARD

Control Board Mounting Nut

Removal and Replacement:

1. Disconnect brewer from power source.

2. Disconnect the funnel sensor(s) from connector
J9 on the control board.

3. Disconnect the main harness from connector J11
on the control board.

4. Disconnect the ribbon cable from connector J4 on
the control board.

5. Disconnect the level probe harness and server
detect harness for SH models from connector J2
on the control board.

6. Remove the two mounting nuts securing the top
of the control board to the hood.

7. Tilt the control board inward to clear the display
section and lift out of the control board mount.

8. Place the bottom edge of the new control board
in the control board mount, tilt the board forward,
and secure with the two keps nuts.

9. Re-connect wires to the circuit board.

Ribbon Cable

Control Board Mount

FIG 1 CONTROL BOARD MOUNTING

Location:

The Control Board (Fig 1) is located under the top
cover behind the control panel.

Check for Power to board:

1. Insert one meter lead in J11-pin 12 and the other
lead in J11-pin 14.

2. With the power connected to brewer, the voltage
reading to the board should be the line voltage
rated for that model.

Page 19

41746 112008

COMPONENT ACCESS (cont)

MEMBRANE SWITCH

Funnel Sensor

FIG 2 MEMBRANE SWITCH

Location:

The Membrane Switch (Fig 2) is located on the front
of the hood with a ribbon cable extending through the
hood and connected to the control board.

4. Remove any adhesive that remains on the hood.

5. Remove the adhesive backing from the new mem­brane switch. Insert the ribbon cable through the
slot in the hood and apply the membrane switch
to the front of the hood.

6. Reconnect the ribbon cable to the 20-pin connec­tor on the control board making sure every pin on
the control board is inserted into the ribbon cable
connector.

Test Procedures:

There are two methods for testing the membrane
switch. The easiest method is to use the built in test
mode. Refer to the Trouble Shooting Section for Service
Tools/Test Switches. If for some reason you can't get
into the program modes, or brewer won't power up,
you can test it with an ohmmeter or continuity tester.
Refer to the schematic to trace the appropriate pins.

NOTE: Pin 1 is the static shield & will not provide a
reading to the other pins. There are three commons
in this circuit, pins #2, 11 & 12.
Disconnect brewer from power source before discon­necting ribbon cable from control board.

Removal and Replacement:

1. Disconnect the ribbon cable from 20-pin connector
on the control board.

2. Disconnect the wires from funnel sensor(s)and
remove sensor(s) from the front of the hood.

3. Gently peel the membrane switch from the
hood.

Page 20

41746 112008

COMPONENT ACCESS (cont)

DISPENSE & BYPASS VALVES

FIG 3 DISPENSE & BYPASS VALVES

Location:

The dispense and bypass valve(s) (Fig 3) are located
inside the hood under the top cover.

Test Procedures:

1. Refer to the Trouble Shooting Section for Service

Tools/Test Outputs/Dispense/Bypass Valve.

2. Be sure brew funnel & server are in place before

activating valve.

3. Check the valve for coil action. Turn on the valve

with the test mode. Listen carefully in the vicinity
of the dispense/bypass valve for a click as the coil
pulls the plunger in.

If no sound is heard as described, proceed to
#4.
If the sound is heard as described, there may be a
blockage in the valve , hose, tank, or sprayhead. Dis­connect the brewer from the power source. Remove
the valve and inspect for blockage, and de-lime all
related areas.

If the polarity of meter leads are reversed, reading
will indicate -170VDC. (Double these readings for
240 volt coils)

If voltage is present as described, but no coil action
is observed, valve is defective. Replace valve and test
again to verify repair.
If voltage is not present as described, refer to Wir­ing Diagrams and check the brewer wiring harness.
Also check the control board and switch for proper
operation.

Removal and Replacement:

1. Disconnect the brewer from the power source.

2. Disconnect wires from the valve.

3. Drain enough water from the tank so the water
level is below the outlet.

4. Remove tube(s) from the valve.

5. Dispense valve:

Remove the sprayhead and nut securing valve to

the sprayhead panel.

Bypass valve:
Remove the two #8-32 mounting nuts.

6. Install new valve using nut(s) removed in step 5.
Clean and install the sprayhead.

7. Reconnect tube(s) to the valve and secure in place
with clamp(s).

4. Connect the voltmeter leads to the coil terminals.
Turn on the valve with the test mode. NOTE: Due

to the internally rectified coil, the indication will
be 120VAC all the time. Set the meter to DC volts.

The indication should be 170VDC when activated.

Page 21

41746 112008

COMPONENT ACCESS (cont)

REFILL VALVE

FIG 4 REFILL VALVE

(DUAL SH DBC Models)

FIG 5 REFILL VALVE

(SINGLE SH DBC Models)

FIG 6 REFILL VALVE

(DUAL TF DBC Early Models)

FIG 7 REFILL VALVE

(DUAL TF DBC Late Models)

Page 22

41746 112008

COMPONENT ACCESS (cont)

REFILL VALVE (cont)

FIG 8 REFILL VALVE

(DUAL GPR DBC Models)

Location:

DUAL SH DBC models:
SINGLE TF DBC late models:
DUAL TF DBC late models:
The refill valve is located inside the front of the
brewer behind the front access panel.

If voltage is not present, refer to Wiring Diagrams
and check main wiring harness. If harness checks ok,
replace control board.

4. Check the refill valve for coil action. Briefly activate
the refill valve in the test mode and listen carefully
near the refill valve for a"clicking" sound as the
magnetic coil pulls the plunger in.

If the sound is heard as described and water will not
pass through the refill valve, there may be a blockage
in the water line before the refill valve or, the solenoid
valve may require inspection for wear, and removal of
waterborne particles.
If the sound is not heard as described, proceed to
# 5.

5. Disconnect the brewer from the power source.

6. Check for continuity across the refill valve coil
terminals.

If continuity is not present as described, replace
the refill valve.
If continuity is present as described, there could
be some debris in the valve.

SINGLE SH DBC models:
SINGLE GPR DBC models:
SINGLE TF DBC early models:
DUAL GPR DBC models:
DUAL TF DBC early models:
The refill valve is located inside the hood of the
brewer under the top cover.

Test Procedures:

1. Enter programming level 2, scroll to "Service Tools"
then scroll to "Refill Valve".

2. Briefly activate the refill valve in the test mode.
With a voltmeter, check the voltage across the coil
wires.

3. The indication must be 120 volts ac for two wire
120 volt models, three wire 120/208, and 120/240
volt models or 230 volts ac for two wire 230 volt
models.

If voltage is present, proceed to # 4.

Removal and Replacement:

1. Shut off the water supply.

2. Remove both wires from the refill valve.

3. Disconnect both water lines at the valve.

4. Remove the two 1/4"-20 screws securing the valve
to the component mounting bracket.

5. Using the two 1/4"-20 screws, install the new valve
to the component mounting bracket.

6. Securely fasten the water lines to the valve.

7. Refer to wiring diagrams when reconnecting the
wires.

8. Install access panels and covers and refer to Initial
Set-up for refill and operation.

Page 23

41746 112008

COMPONENT ACCESS (cont)

TANK HEATERS

Location:

The tank heaters (Fig 9) are located inside the tank,
secured to the tank lid.

Test Procedures:

1. With a voltmeter, check voltage across the white
wire (120V Models) or red wire (120/208 and
120/240V Models) and blue wire on the top of
the tank heaters. Connect brewer to the power
source. The indication must be 120 volts ac for
two wire 120 volt models, 208 volts ac for three
wire 120/208 volt models and 240 volts ac for
120/240 volt models (during a heating cycle).

2. Disconnect the brewer from the power source.

If voltage is present as described, proceed to #3.
If voltage is not present as described, refer to the
Wiring Diagrams and check wiring harness. If harness
checks ok, replace control board.

3. Disconnect the wires from the tank heater termi­nals.

4. Check resistance value across tank heater terminals
and compare to chart.

If resistance is present as described, reconnect the
wires, the tank heater is ok.
If resistance is not present as described, replace the
tank heater.

Tank Heaters

FIG 9 TANK HEATERS

Removal and Replacement:

1. Remove the top cover from the brewer.

2. Disconnect the wires from tank heater terminals.

3. Remove the four #8-32 nuts securing the tank
heater(s) to the tank lid assembly.

4. Remove tank heater(s) with gasket(s) and dis­card.

5. Install new tank heater(s) with gasket(s) to the
tank lid assembly with the original nuts.

6. Reconnect the wires to the tank heater(s) termi­nals.

NOTE- If any resistance is read between sheath and
either terminal, remove and inspect heater for cracks
in the sheath.

HEATER RESISTANCE

1800W-120V 8.05
2200W-120V 6.54
2850W-208V 15.25
3300W-240V 18.81
4000W-208V 11.0
4000W-240V 14.47
5000W-240V 11.65
TERMINAL TO SHEATH - INFINITE (OPEN)

Page 24

41746 112008

COMPONENT ACCESS (cont)

TEMPERATURE PROBE

Removal and Replacement:

1. Disconnect the brewer from the power source.

2. Refer to instructions included in Temperature Probe

Kit#29327.0000toreplaceTemperatureProbe.

LIMIT THERMOSTAT

Temperature Probe

FIG 10 TEMPERATURE PROBE

Location:

The temperature probe (Fig 10) is inserted into a

grommet in the tank lid assembly.

Test Procedures:

1. Disconnect the brewer from the power source.

2. With a DC voltmeter, check voltage across the
black and white wires at J2 on control board (Black
voltmeter probe to black wire, red voltmeter probe
to white wire). Connect the brewer to the power
source. The indication should be aproximately be­tween 4vdc cool to 1vdc at ready temperature.

3. Disconnect the brewer from the power source.

If voltage is present as described, circuit is working
correctly, check limit thermostat (and TCO on 200V
and 230V models).
If voltage is not present as described, proceed to
#4.

4. Disconnect temperature probe from J2 on control
board. Check the resistance across the two ter­minals of the temperature probe. The indication

shouldbeaproximatelybetween10.5K

cool to

870 at ready temperature.

If resistance is to specification, replace the control
board.
If resistance is not to specification, replace the tem­perature probe.

Page 25

Limit Thermostats

FIG 11 LIMIT THERMOSTATS

Location:

The limit thermostats (Fig 11) are located under
the top cover on the tank lid assembly.

Test Procedures:

1. Disconnect the brewer from the power source.

2. Disconnect the wires from the limit thermostat.

3. With an ohmmeter, check for continuity across
the limit thermostat terminals.

If continuity is present as described, the limit thermostat

is operating properly.

If continuity is not present as described, replace the

limit thermostat.

Removal and Replacement:

1. Remove the wires from limit thermostat termi­nals.

2 Remove the two #8-32 nuts securing the limit

thermostat to the tank lid and lift limit thermostat
off the studs.

3. Install the new limit thermostat onto the studs on
the tank lid and secure with original nuts.

4. Connect the wires to the limit thermostat.

41746 112008

COMPONENT ACCESS (cont)

WARMER ELEMENTS (GPR MODELS)

Removal and Replacement:

1. Remove the three #4-40 screws securing the
warmer assembly to the brewer.

2. Lift the warmer assembly from the brewer.

3. Disconnect the two wires from the warmer element
terminals.

4. Remove the two #8-32 nuts securing the warmer
element to the warmer plate.

5. Securely install new warmer element.

6. Reconnect the two wires to warmer element ter­minals.

7. Securely install warmer assembly on the brewer.

FIG 12 WARMER ELEMENTS

Location:

The warmer element(s) (FIG 12) is located under

the warmer plate(s).

Test Procedures:

1. Disconnect the brewer from the power source.

2. With a voltmeter, check voltage across the two
wires at the warmer element with the "ON/OFF"
switch in the "ON" position. Connect the brewer
to the power source. The indication must be 120
volts ac.

3. Disconnect the brewer from the power source.

If voltage is present as described, proceed to #4.
If voltage is not present as described, refer to Wiring
Diagrams and check wiring harness.

4. Check the resistance across the two terminals on
warmer element. Resistance should be 144.0

terminal to sheath - infinite (open).

MASTER POWER SWITCH

FIG 13 MASTER POWER SWITCH

Location:

The main power switch (FIG 13) is located un­der the brewer in the base just behind the right front

,

leg on SH and GPR models and behind the front
support leg on TF models.

If resistance is to specification, reconnect the two
wires to the warmer element.
If resistance is not to specification, replace the warmer
element.

Page 26

Test Procedure:

1. Disconnect the brewer from the power source.

2. Disconnect the wires from the power switch. With
the switch in the ON position, check for continuity
between terminals opposite each other.

There should be continuity between the two terminals
on each side when the switch is in the ON position,
no continuity when in the OFF position.

41746 040210

COMPONENT ACCESS (cont)

MASTER POWER SWITCH (cont)

If continuity is not present as described, replace the
switch.

Removal and Replacement:

1. Disconnect the brewer from the power source.

2. Disconnect the wires from the power switch.

3. Remove the switch mounting screws from the
under the base.

4. Install new switch in trunk with the two 6-32 x ¼˝
mounting screws.

5. Connect wires to the switch terminals.

SH SERVER TIMER SETTING

Timer may be set to the OFF position as shown

on Tag (Fig 15) to prevent the LED on the front of
the server from flashing, or one of nine various set­tings to flash the LED after Timer has expired. For
instance, setting Timer on position 5 will flash the
LED after 120 minutes. Server must be docked on a
SH Brewer or SH Server Stand to engage Timer.

INSTRUCTIONS:

•Emptyallcontentsandturnserverupsidedown.

•Removetwoscrews(Fig14)securingbottom

cover to server, remove bottom cover from server.

•RefertotheTimerSettingTag(Fig15)todeter-

mine the desired timer setting number.

•Usingasmallatbladescrewdriver,settheTimer

to the corresponding number (Fig 16).

•Installthebottomcoveronserverandsecurewith

screws.

FIG 15 TIMER & TAG

FIG 16 SETTING TIMER

FIG 14 REMOVE BOTTOM COVER

Page 27

41746 040210

LIMIT THERMOSTAT

TRIAC

TANK HEATER

SOL

SOL

SOL

SOL

BREW

BYPASS

REFILL

WHI

WHI

WHI

WHI

WHI

MT 1 BLU -14

BLK-14 BLK-14

RED

N.C.

RED

OVERFLOW

PROTECTION SWITCH

FUNNEL LOCK

(OPTIONAL)

+

–

AC

AC

RECTIFIER

4

AMP

24VDC

+

–

WHI

BLK

BLU/BLK

BLK

BLU/BLK

RED

120/208 OR 120/240

VOLT A.C. + GND

SINGLE PHASE

32043.0000D 01/07 © 2000 BUNN-O-MATIC CORPORATION

SCHEMATIC WIRING DIAGRAM

SINGLE® SH with SMART FUNNEL® (DBC)

MT2

SERVER
TRANSFORMER

BRN/BLK

BRN/WHI

BLK

YEL

TAN

WHI

WHI/VIO

GRY

WHI/GRN

VIO

SWITCH UNIT ASSY

SHIELD

FUNNEL SENSOR

CONTROL PC BOARD

WATER LEVEL

PROBE

TEMP

PROBE

VIO

WHI/VIO

WHI

PNK
BLK

BLK

GRN

WHI/RED

Touch Switch Assembly Codes

A1 Brew
A2 On/Off
B1 "Hidden" Left
B2 "Hidden" Right
C1 Large Batch
C2 Medium Batch
C3 Small Batch
D1 "Digital" Left Hidden Button
D2 "Brewer" Center Hidden Button
D3 "Control" Right Hidden Button

L1 Large Batch LED
L2 Medium Batch LED
L3 Small Batch LED
L4 On/Off LED

LED's

GRN

RED-14

BLK-14

N

L1

BLK-14

RED-14

RED-14

BLK-14

MODELS WITH MAIN ON/OFF SWITCH ONLY

WHI

WHI

L2

RED

BLK

Page 28

41746 112008

LIMIT THERMOSTAT

TRIAC

TANK HEATER

SOL

SOL

SOL

SOL

BREW

BYPASS

REFILL

WHI

WHI

MT 1 BLU -14

BLK-14

BLK-14

RED

N.C.

RED

OVERFLOW

PROTECTION SWITCH

FUNNEL LOCK

(OPTIONAL)

+

–

AC

AC

RECTIFIER

4

AMP

24VDC

+

–

BLK

BLU/BLK

BLK

BLU/BLK

RED

230 VOLT AC

2 WIRE

SINGLE PHASE

50HZ

MT2

SERVER

TRANSFORMER

BRN/BLK

BRN/WHI

BLK

YEL

TAN

WHI/VIO

GRY

WHI/GRN

VIO

THERMAL

SAFETY FUSE

THERMAL

SAFETY FUSE

RED

RED

RED RED

RED

RESETTABLE

FUSE

BLK

SCHEMATIC WIRING DIAGRAM

SINGLE SH DBC (W/SMART FUNNEL)

L2

L1

RED

RED

EMI

FILTER

GRN/YEL

BLK

BLK

Touch Switch Assembly Codes

A1 Brew
A2 On/Off
B1 "Hidden" Left
B2 "Hidden" Right
C1 Large Batch
C2 Medium Batch
C3 Small Batch
D1 "Digital" Left Hidden Button
D2 "Brewer" Center Hidden Button
D3 "Control" Right Hidden Button

L1 Large Batch LED
L2 Medium Batch LED
L3 Small Batch LED
L4 On/Off LED

LED's

C1 D1 A1 B1 B2 A2 D2 D3 C2 C3

L3

L4 L1 L2

TOUCH SWITCH ASSMBLE

Page 29

41746 112008

LIMIT THERMOSTAT

TRIAC

TANK HEATER

SOL

SOL

SOL

SOL

BREW

BYPASS

REFILL

WHI

WHI

MT 1 BLU -14

BLK-14

BLK-14

RED

N.C.

RED

OVERFLOW

PROTECTION SWITCH

FUNNEL LOCK

(OPTIONAL)

+

–

AC

AC

RECTIFIER

4

AMP

24VDC

+

–

BLK

BLU/BLK

BLK

BLU/BLK

RED

200 VOLT AC

2 WIRE

SINGLE PHASE

50/60HZ

MT2

SERVER

TRANSFORMER

BRN/BLK

BRN/WHI

BLK

YEL

TAN

WHI/VIO

GRY

WHI/GRN

VIO

THERMAL

SAFETY FUSE

THERMAL

SAFETY FUSE

RED

RED

RED RED

RED

RESETTABLE

FUSE

BLK

SCHEMATIC WIRING DIAGRAM

SINGLE SH DBC (W/SMART FUNNEL)

L2

L1

RED

RED

EMI

FILTER

GRN/YEL

BLK

BLK

Touch Switch Assembly Codes

A1 Brew
A2 On/Off
B1 "Hidden" Left
B2 "Hidden" Right
C1 Large Batch
C2 Medium Batch
C3 Small Batch
D1 "Digital" Left Hidden Button
D2 "Brewer" Center Hidden Button
D3 "Control" Right Hidden Button

L1 Large Batch LED
L2 Medium Batch LED
L3 Small Batch LED
L4 On/Off LED

LED's

C1 D1 A1 B1 B2 A2 D2 D3 C2 C3

L3

L4 L1 L2

TOUCH SWITCH ASSMBLE

Page 30

41746 112008

LIMIT THERMOSTAT

TRIAC

TANK HEATER

SOL

SOL

SOL

SOL

BREW

BYPASS

REFILL

WHI

WHI-14

WHI

WHI

WHI

WHI

W
H

I

L1

N

MT 1 BLU -14

BLK-14 BLK-14

RED

N.C.

RED

OVERFLOW

PROTECTION SWITCH

FUNNEL LOCK

(OPTIONAL)

+

–

AC

AC

RECTIFIER

4

AMP

24VDC

+

–

WHI

BLK

BLU/BLK

BLK

BLU/BLK

RED

120 VOLT A.C.

2 - WIRE

SINGLE PHASE

SCHEMATIC WIRING DIAGRAM

SINGLE® SH with SMART FUNNEL® (DBC)

MT2

SERVER
TRANSFORMER

B
L
K

BRN/BLK

BRN/WHI

BLK

YEL

TAN

WHI

WHI/VIO

GRY

WHI/GRN

VIO

SWITCH UNIT ASSY

SHIELD

FUNNEL SENSOR

CONTROL PC BOARD

WATER LEVEL

PROBE

TEMP

PROBE

VIO

WHI/VIO

WHI

PNK
BLK

BLK

GRN

WHI/RED

Touch Switch Assembly Codes

A1 Brew
A2 On/Off
B1 "Hidden" Left
B2 "Hidden" Right
C1 Large Batch
C2 Medium Batch
C3 Small Batch
D1 "Digital" Left Hidden Button
D2 "Brewer" Center Hidden Button
D3 "Control" Right Hidden Button

L1 Large Batch LED
L2 Medium Batch LED
L3 Small Batch LED
L4 On/Off LED

LED's

Page 31

41746 112008

LIMIT THERMOSTAT

TRIAC

TANK HEATER

SOL

SOL

SOL

SOL

BREW

BYPASS

REFILL

WHI

WHI

WHI

WHI

WHI

MT 1 BLU -14

BLK-14 BLK-14

RED

N.C.

RED

OVERFLOW

PROTECTION SWITCH

FUNNEL LOCK

(OPTIONAL)

+

–

AC

AC

RECTIFIER

4

AMP

24VDC

+

–

WHI

BLK

BLU/BLK

BLK

BLU/BLK

RED

SCHEMATIC WIRING DIAGRAM

SINGLE SH DBC with SMART FUNNEL

(With Audible Alarm)

MT2

SERVER
TRANSFORMER

BRN/BLK

BRN/WHI

BLK

YEL

TAN

WHI

WHI/VIO

GRY

WHI/GRN

VIO

SWITCH UNIT ASSY

SHIELD

FUNNEL SENSOR

CONTROL PC BOARD

WATER LEVEL

PROBE

TEMP

PROBE

VIO

WHI/VIO

WHI

PNK
BLK

BLK

GRN

WHI/RED

Touch Switch Assembly Codes

A1 Brew
A2 On/Off
B1 "Hidden" Left
B2 "Hidden" Right
C1 Large Batch
C2 Medium Batch
C3 Small Batch
D1 "Digital" Left Hidden Button
D2 "Brewer" Center Hidden Button
D3 "Control" Right Hidden Button

L1 Large Batch LED
L2 Medium Batch LED
L3 Small Batch LED
L4 On/Off LED

LED's

WHI

BLK

AUDIBLE

ALARM

(FRESHNESS)

120/208 VOLT A.C. OR

120/240 VOLT A.C.

3 WIRE + GND

SINGLE PHASE

GRN

RED-14

BLK-14

N

L1

BLK-14

RED-14

RED-14

BLK-14

MODELS WITH MAIN ON/OFF SWITCH ONLY

WHI

WHI

L2

RED

BLK

Page 32

41746 112008

LIMIT THERMOSTAT

TRIAC

TANK HEATER

SOL

SOL

SOL

SOL

BREW

BYPASS

REFILL

WHI

WHI

MT 1 BLU -14

BLK-14

BLK-14

RED

N.C.

RED

OVERFLOW

PROTECTION SWITCH

FUNNEL LOCK

(OPTIONAL)

+

–

AC

AC

RECTIFIER

4

AMP

24VDC

+

–

BLK

BLU/BLK

BLK

BLU/BLK

RED

200 VOLT AC
2 WIRE + GND
SINGLE PHASE

50/60HZ

MT2

SERVER

TRANSFORMER

BRN/BLK

BRN/WHI

BLK

YEL

TAN

WHI/VIO

GRY

WHI/GRN

VIO

RED

RED

RED RED

RED

BLK

SCHEMATIC WIRING DIAGRAM

SINGLE SH DBC (W/SMART FUNNEL)

Touch Switch Assembly Codes

A1 Brew
A2 On/Off
B1 "Hidden" Left
B2 "Hidden" Right
C1 Large Batch
C2 Medium Batch
C3 Small Batch
D1 "Digital" Left Hidden Button
D2 "Brewer" Center Hidden Button
D3 "Control" Right Hidden Button

L1 Large Batch LED
L2 Medium Batch LED
L3 Small Batch LED
L4 On/Off LED

LED's

C1 D1 A1 B1 B2 A2 D2 D3 C2 C3

L3

L4 L1 L2

TOUCH SWITCH ASSMBLE

GRN

L1

BLK-14

RED-14

RED-14 RED-14

BLK-14

MAIN ON/OFF SWITCH ONLY

(Late Models only)

L2

RED

BLK

BLK-14

Page 33

41746 112008

29876.0000D 01/07 © 2001 BUNN-O-MATIC CORPORATION

120/208 OR 120/240

VOLT A.C. + GND

SINGLE PHASE

GRN

N

L1

BLK-14

RED-14

RED-14

RED-14

RED-14

RED-14

BLK-14BLK-14

MODELS WITH MAIN ON/OFF SWITCH ONLY

WHI

WHI

L2

RED

BLK

SCHEMATIC WIRING DIAGRAM

DUAL SH with SMART FUNNEL (DBC)

Page 34

41746 112008

RED

RED

RED

RED

29876.0001A 08/02 © 2002 BUNN-O-MATIC CORPORATION

230 VOLTS AC

2 WIRE

SINGLE PHASE

50HZ

THERMAL

SAFETY FUSE

THERMAL

SAFETY FUSE

THERMAL

SAFETY FUSE

THERMAL

SAFETY FUSE

RED

RED

RESETTABLE

FUSE

SCHEMATIC WIRING DIAGRAM

DUAL SH DBC (W/SMART FUNNEL)

RIGHT

TANK HEATER

LEFT

TANK HEATER

TRIAC

TRIAC

TEMP

PROBE

BLK

BLK

BLU/BLK

BLU/BLK

BLK

BLU/BLK

BLK

BLU/BLK

BRN/BLK

BRN/WHI

BLK

BLU

BLK-14

BLK-14

BLK-14

BLK-14

BLK

BLK

BLK

RED/BLK

RED

RED

WHI/RED

RED

RED

WHI/RED

WHI/ORA

ORA

WHI/GRN

VIO

WHI/VIO

GRY

TAN
TAN
YEL

SOL

SOL

SOL

SOL

SOL

SOL

L. FUNNEL LOCK

SOL

R. FUNNEL LOCK

L. BREW

R. BREW

L. BYPASS

R. BYPASS

REFILL

N.C.

OVERFLOW

PROTECTION SWITCH

WHI

WHI

WHI

WHI

MT2

MT2

MT1

BLU-14

MT1

BLU-14

L2

LIMIT THERMOSTAT

L1

PNK

WHI

GRN

WATER LEVEL

PROBE

AC

AC

4

AMP

RESETTABLE

FUSE

24VDC

LEFT
SERVER
TRANSFORMER

RIGHT
SERVER
TRANSFORMER

RECTIFIER

AC

AC

4

AMP

RECTIFIER

24VDC

CONTROL PC BOARD

RIGHT

FUNNEL SENSOR

LEFT

FUNNEL SENSOR

VIO

WHI/VIO

WHI/YEL

YEL

J9-1

J9-5

J2-1

J2-5

J2-10

J11-1

J11-10

J11-18

J11-5

J4-1

J4-10

J4-19

J4-5

J4-15

Touch Switch Assembly Codes

A1 Left Brew
A2 Left On/Off
A3 Right On/Off
A4 Right Brew
B1 "Hidden" Left
B2 "Hidden" Right
C1 Left Large Batch
C2 Left Medium Batch

C3 Left Small Batch
C4 Right Large Batch
C5 Right Medium Batch
C6 Right Small Batch
D1 "Digital" Left Hidden Button
D2 "Brewer" Center Hidden Button
D3 "Control" Right Hidden Button

L1 Left Large Batch LED
L2 Left Medium Batch LED
L3 Left Small Batch LED
L4 Left On/Off LED
L5 Right On/Off LED
L6 Right Large Batch LED
L7 Right Medium Batch LED
L8 Right Small Batch LED

LED's

20

SHEILD

1

L1

L4 L5 L6 L7 L8 L3

L2

RED

RED

EMI

FILTER

GRN/YEL

BLK

BLK

C1 A1 B1 B2 A2 A3 A4 D1 D2 D3 C2 C3 C4 C5 C6

TOUCH SWITCH ASSEMBLY

Page 35

41746 112008

RED

RED

RED

RED

29876.0003A 06/04 © 2004 BUNN-O-MATIC CORPORATION

THERMAL

SAFETY FUSE

THERMAL

SAFETY FUSE

THERMAL

SAFETY FUSE

THERMAL

SAFETY FUSE

RED

RED

RESETTABLE

FUSE

SCHEMATIC WIRING DIAGRAM

DUAL SH DBC (W/SMART FUNNEL)

RIGHT

TANK HEATER

LEFT

TANK HEATER

TRIAC

TRIAC

TEMP

PROBE

BLK

BLK

BLU/BLK

BLU/BLK

BLK

BLU/BLK

BLK

BLU/BLK

BRN/BLK

BRN/WHI

BLK

BLU

BLK-14

BLK-14

BLK-14

BLK-14

BLK

BLK

BLK

RED/BLK

RED

RED

WHI/RED

RED

RED

WHI/RED
WHI/ORA

ORA

WHI/GRN

VIO

WHI/VIO

GRY

TAN
TAN
YEL

SOL

SOL

SOL

SOL

SOL

SOL

L. FUNNEL LOCK

SOL

R. FUNNEL LOCK

L. BREW

R. BREW

L. BYPASS

R. BYPASS

REFILL

N.C.

OVERFLOW

PROTECTION SWITCH

WHI

WHI

WHI

WHI

MT2

MT2

MT1

BLU-14

MT1

BLU-14

L2

LIMIT THERMOSTAT

L1

PNK

WHI

GRN

WATER LEVEL

PROBE

AC

AC

4

AMP

RESETTABLE

FUSE

24VDC

LEFT
SERVER
TRANSFORMER

RIGHT
SERVER
TRANSFORMER

RECTIFIER

AC

AC

4

AMP

RECTIFIER

24VDC

CONTROL PC BOARD

RIGHT

FUNNEL SENSOR

LEFT

FUNNEL SENSOR

VIO

WHI/VIO

WHI/YEL

YEL

J9-1

J9-5

J2-1

J2-5

J2-10

J11-1

J11-10

J11-18

J11-5

J4-1

J4-10

J4-19

J4-5

J4-15

Touch Switch Assembly Codes

A1 Left Brew
A2 Left On/Off
A3 Right On/Off
A4 Right Brew
B1 "Hidden" Left
B2 "Hidden" Right
C1 Left Large Batch
C2 Left Medium Batch

C3 Left Small Batch
C4 Right Large Batch
C5 Right Medium Batch
C6 Right Small Batch
D1 "Digital" Left Hidden Button
D2 "Brewer" Center Hidden Button
D3 "Control" Right Hidden Button

L1 Left Large Batch LED
L2 Left Medium Batch LED
L3 Left Small Batch LED
L4 Left On/Off LED
L5 Right On/Off LED
L6 Right Large Batch LED
L7 Right Medium Batch LED
L8 Right Small Batch LED

LED's

20

SHEILD

1

L1

L4 L5 L6 L7 L8 L3

L2

RED

RED

EMI

FILTER

GRN/YEL

BLK

BLK

C1 A1 B1 B2 A2 A3 A4 D1 D2 D3 C2 C3 C4 C5 C6

TOUCH SWITCH ASSEMBLY

Page 36

41746 112008

LIMIT THERMOSTAT

TRIAC

TANK HEATER #1

SOL

SOL

SOL

SOL

BREW

BYPASS

REFILL

WHI

WHI

WHI

WHI

MT 1 BLU -14

BLK-14 BLK-14

RED

N.C.

RED

OVERFLOW

PROTECTION SWITCH

FUNNEL LOCK

(OPTIONAL)

120 VOLT A.C. + GND OR

120/208-240 VOLT A.C. + GND

SINGLE PHASE

32043.0003C 01/07 © 2004 BUNN-O-MATIC CORPORATION

SCHEMATIC WIRING DIAGRAM

SINGLE GPR DBC-DV with SMART FUNNEL

MT2

BRN/BLK

BRN/WHI

BLK

YEL

TAN

WHI

WHI/VIO

GRY

WHI/GRN

VIO

SWITCH UNIT ASSY

SHIELD

FUNNEL SENSOR

TANK LID ASSEMBLY

CONTROL PC BOARD

WATER LEVEL

PROBE

TEMP

PROBE

VIO

WHI/VIO

WHI

PNK
BLK

GRN

WHI/VIO

WARMER

WHI

WHI

BLK

WHI/VIO

RED-14

TANK HEATER #2

VOLTAGE SELECTOR SWITCH

120V Only

120V-208/240V

120V 3235W

20922-0004

20922-0001

120V 1650W

HEATER #1

LIMIT

HEATER #2

Touch Switch Assembly Codes

A1 Brew
A2 On/Off
B1 "Hidden" Left
B2 "Hidden" Right
C1 Large Batch
C2 Medium Batch
C3 Small Batch
D1 "Digital" Left Hidden Button
D2 "Brewer" Center Hidden Button
D3 "Control" Right Hidden Button

L1 Large Batch LED
L2 Medium Batch LED
L3 Small Batch LED
L4 On/Off LED

LED's

GRN

RED-14

BLK-14

N

L1

BLK-14

RED-14

RED-14

BLK-14

MODELS WITH MAIN ON/OFF SWITCH ONLY

WHI

WHI

L2

RED

BLK

Page 37

41746 112008

SCHEMATIC WIRING DIAGRAM

DUAL GPR with SMART FUNNEL (DBC)

GRN

BLK

PNK

WHI

TEMP PROBE

J2-1

J9-1

J11-1

J11-5

J11-10

J11-18

J9-5

J2-10

J2-5

CONTROL PC BOARD

J4-1

J4-5

J4-10

J4-15

J4-19

29876.0004B 01/07 © 2004 BUNN-O-MATIC CORPORATION

120/208 OR 120/240

VOLT A.C. + GND

SINGLE PHASE

WHI/VIO

WHI/RED

RT WARMER

LT WARMER

WHI

WHI

WHI

WHI

WHI

WHI

WHI

WHI

R.FUNNELLOCK

L.FUNNELLOCK

OPTIONAL

SOL

SOL

SOL

SOL

SOL

SOL

SOL

GRN

N

L1

BLK-14

RED-14

RED-14

RED-14

RED-14

RED-14

BLK-14BLK-14

MODELS WITH MAIN ON/OFF SWITCH ONLY

WHI

WHI

L2

RED

BLK

Page 38

41746 112008

35726.0000B 02/07 © 2003 Bunn-O-Matic Corporation

120/208 OR 120/240 VOLT A.C.

3 WIRE + GND

SINGLE PHASE

SCHEMATIC WIRING DIAGRAM

SINGLE TF DBC

FUNNELLOCK

SOL

BREW

BYPASS

REFILL

WHI

WHI

WHI

VIO

GRY

WHI/GRN

BRN/WHI

BRN/BLK

TAN

YEL

BLK

WHI

TANKHEATER

TRIAC

MT 1 BLU-14BLK-14BLK-14

MT2

LIMIT THERMOSTAT

FUNNEL SENSOR

WHI/VIO

VIO

WHI

PNK
BLK

GRN

TEMP PROBE

WATER LEVEL

PROBE

RED RED

N.C.

OVERFLOW

PROTECTION SWITCH

CONTROL PC BOARD

SWITCH UNIT ASSEMBLY

Switch Unit Assembly Codes

A1 Brew
A2 On/Off
B1 "Hidden" Left
B2 "Hidden" Right
C1 Large Batch

C2 Medium Batch
C3 Small Batch
D1 "Digital" Left Hidden Button
D2 "Brewer" Center Hidden Button
D3 "Control" Right Hidden Button

LED's

L1 Large Batch LED
L2 Medium Batch LED
L3 Small Batch LED
L4 On/Off LED

GRN

RED-14

BLK-14

N

L1

BLK-14

RED-14

RED-14

BLK-14

MODELS WITH MAIN ON/OFF SWITCH ONLY

WHI

WHI

L2

RED

BLK

SOL

SOL

SOL

Page 39

41746 112008

36883.0000A 05/04 © 2004 Bunn-O-Matic Corporation

230 OR 200

VOLT A.C.

SINGLE PHASE

SCHEMATIC WIRING DIAGRAM

SINGLE TF DBC

FUNNELLOCK

SOL

SOL

SOL

SOL

BREW

BYPASS

REFILL

RED

RED

RED

VIO

GRY

WHI/GRN

BRN/WHI

BRN/BLK

TAN
YEL

BLK

RED

L2

TANKHEATER

TRIAC

MT 1 BLU-14 RED-14BLK-14BLK-14

RED-14BLK-14

RED-14BLK-14

MT2

L1

LIMIT THERMOSTAT

FUNNEL SENSOR

WHI/VIO

VIO

WHI

PNK

BLK

GRN

TEMP PROBE

WATER LEVEL

PROBE

RED RED

N.C.

OVERFLOW

PROTECTION SWITCH

CONTROL PC BOARD

SWITCH UNIT ASSEMBLY

Switch Unit Assembly Codes

A1 Brew
A2 On/Off
B1 "Hidden" Left
B2 "Hidden" Right
C1 Large Batch

C2 Medium Batch
C3 Small Batch
D1 "Digital" Left Hidden Button
D2 "Brewer" Center Hidden Button
D3 "Control" Right Hidden Button

LED's

L1 Large Batch LED
L2 Medium Batch LED
L3 Small Batch LED
L4 On/Off LED

GRN

Page 40

41746 112008

36883.0002A 11/04 © 2004 Bunn-O-Matic Corporation

120 VOLT A.C.

2 WIRE SINGLE PHASE

60HZ

SCHEMATIC WIRING DIAGRAM

SINGLE TF DBC

FUNNEL LOCK

SOL

SOL

SOL

SOL

BREW

BYPASS

REFILL

WHI

WHI

WHI

VIO

GRY

WHI/GRN

BRN/WHI
BRN/BLK

TAN
YEL
BLK

WHI

N

TANK HEATER

TRIAC

MT 1 BLU-14 WHI-14BLK-14BLK-14

MT2

L1

LIMIT THERMOSTAT

FUNNEL SENSOR

WHI/VIO

VIO

WHI

PNK
BLK

GRN

TEMP PROBE

WATER LEVEL

PROBE

RED RED

N.C.

OVERFLOW

PROTECTION SWITCH

CONTROL PC BOARD

SWITCH UNIT ASSEMBLY

Switch Unit Assembly Codes

A1 Brew
A2 On/Off
B1 "Hidden" Left
B2 "Hidden" Right
C1 Large Batch

C2 Medium Batch
C3 Small Batch
D1 "Digital" Left Hidden Button
D2 "Brewer" Center Hidden Button
D3 "Control" Right Hidden Button

LED's

L1 Large Batch LED
L2 Medium Batch LED
L3 Small Batch LED
L4 On/Off LED

Page 41

41746 112008

36883.0001B 02/07 © 2004 Bunn-O-Matic Corporation

200,208 or 240 VOLT A.C.

2 WIRE + GND

SINGLE PHASE 50/60HZ

SCHEMATIC WIRING DIAGRAM

SINGLE TF DBC

FUNNELLOCK

SOL

BREW

BYPASS

REFILL

RED

RED

RED

VIO

GRY

WHI/GRN

BRN/WHI

BRN/BLK

TAN
YEL

BLK

RED

TANKHEATER

TRIAC

MT 1 BLU-14 RED-14BLK-14BLK-14

MT2

LIMIT THERMOSTAT

FUNNEL SENSOR

WHI/VIO

VIO

WHI

PNK
BLK

GRN

TEMP PROBE

WATER LEVEL

PROBE

RED RED

N.C.

OVERFLOW

PROTECTION SWITCH

CONTROL PC BOARD

SWITCH UNIT ASSEMBLY

Switch Unit Assembly Codes

A1 Brew
A2 On/Off
B1 "Hidden" Left
B2 "Hidden" Right
C1 Large Batch

C2 Medium Batch
C3 Small Batch
D1 "Digital" Left Hidden Button
D2 "Brewer" Center Hidden Button
D3 "Control" Right Hidden Button

LED's

L1 Large Batch LED
L2 Medium Batch LED
L3 Small Batch LED
L4 On/Off LED

GRN

L1

BLK-14

RED-14

RED-14 RED-14

BLK-14

MAIN ON/OFF SWITCH

(Late Models only)

L2

RED

BLK

BLK-14

SOL

SOL

SOL

Page 42

41746 112008

36883.0003A 02/07 © 2007 Bunn-O-Matic Corporation

FUNNELLOCK

SOL

SOL

SOL

SOL

BREW

BYPASS

REFILL

RED

RED

RED

VIO

RED/BLK

GRY

WHI/GRN

BRN/WHI

BRN/BLK

YEL

BLK

RED

FUNNEL SENSOR

WHI/VIO

VIO

WHI

PNK
BLK

GRN

TEMP PROBE

WATER LEVEL

PROBE

RED RED

N.C.

OVERFLOW

PROTECTION SWITCH

CONTROL PC BOARD

SWITCH UNIT ASSEMBLY

Switch Unit Assembly Codes

A1 Brew
A2 On/Off
B1 "Hidden" Left
B2 "Hidden" Right
C1 Large Batch

C2 Medium Batch
C3 Small Batch
D1 "Digital" Left Hidden Button
D2 "Brewer" Center Hidden Button
D3 "Control" Right Hidden Button

LED's

L1 Large Batch LED
L2 Medium Batch LED
L3 Small Batch LED
L4 On/Off LED

RED

RED

SCHEMATIC WIRING DIAGRAM

SINGLE TF DBC, CE 3 PHASE W/NEUTRAL

TANKHEATER #2

TANKHEATER #1

BLK

BLK-14

RED

RED

BLU

BRN

BLU

BLU

BRN

BRN

RED

TANKHEATER #3

RED

- LINE

- LOAD

BLK

GRN

CONTACTOR

EMI FILTER

L1L1L2L2L3L3N

L1 L2 L3 N

N

TANKLIDASEMBLY

BLK

RED

BRN

BLU

TERMINALBLOCK

THERMOSTAT (1/2)

Wire as shown for 3 phase. For single
phase operation, move red wire in
terminal block into cell with black wire;
apply power across L1 & N.

34

RED/BLK

HEATER

#1

#2

HEATER

LIMIT

#3

HEATER

2

143

BLK

RED

2.2uF

LIMIT THERMOSTAT (1/2)

21

400-415 VOLT A.C.

PHASE TO PHASE,

230 VOLTS AC

PHASE TO NEUTRAL

3 PHASE 50/60 HZ

BREWER

ON/OFF

SWITCH

Page 43

41746 112008

34916.0000B 02/07 © 2002 Bunn-O-Matic Corporation

120/208 OR 120/240 VOLT A.C.

3 WIRE + GND

SINGLE PHASE

SCHEMATIC WIRING DIAGRAM

DUAL TF DBC BREWWISE

RIGHT

TANK HEATER

LEFT

TANK HEATER

SWITCH UNIT ASSY

C5C4C6

WHI

REFILL

R. BYPASS

SOL

SOL

SOL

WHI

WHI

WHI

WHIL. BREW

R. BREW

L. BYPASS

R. FUNNEL LOCK

L. FUNNEL LOCK

SOL

SOL

REDRED

N.C.

OVERFLOW

PROTECTON SWITCH

BLU/BLK

BRN/BLK

BRN/WHI

BLU

WHI

BLK

YEL

TAN

TAN

GRY

ORA

WHI/GRN

WHI/ORA

VIO

20

SOL

SOL

A4

B2

A3

B1

A2

D3

A1

D2

C3

D1

C2

C1

L3

L8

L7

L6

L5

L4

L1

L2

MT 1

MT 1

MT2

BLK-14

LIMIT THERMOSTAT

LIMIT THERMOSTAT

BLK-14

BLK-14 BLK-14

MT2

TRIAC

TRIAC

BLU-14

BLU-14

SHIELD

1

J4-1

J4-5

J4-10

J4-15

J4-19

J11-1

J11-5

CONTROL PC BOARD

J11-10

J11-18

J9-1J9-1

J9-5

J2-1

J2-5

J2-10

WHI

PNK
BLK

GRN

TEMP PROBE

A1 Left Brew C3 Left Small Batch
A2 Left On/Off C4 Right Large Batch
A3 Right On/Off C5 Right Medium Batch
A4 Right Brew C6 Right Small Batch
B1 "Hidden" Left D1 "Digital" Left Hidden Button
B2 "Hidden" Right D2 "Brewer" Center Hidden Button
C1 Left Large Batch D3 "Control" Right Hidden Button
C2 Left Medium Batch

L1 Left Large Batch LED
L2 Left Medium Batch LED
L3 Left Small Batch LED
L4 Left On/Off LED
L5 Right On/Off LED
L6 Right Large Batch LED
L7 Right Medium Batch LED
L8 Right Small Batch LED

Switch Unit Assembly Codes

WATER LEVEL

PROBE

WHI/YEL

YEL

VIO

WHI/VIO

RIGHT

FUNNEL SENSOR

LEFT

FUNNEL SENSOR

LED's

GRN

RED-14

RED-14

BLK-14

N

L1

BLK-14

RED-14

RED-14

BLK-14

MODELS WITH MAIN ON/OFF SWITCH ONLY

WHI

WHI

L2

RED

BLK

Page 44

41746 112008

BLK-14

GRN/YEL

L2

L1

BLU-14

BLU-14

BLK-14

RED-14RED-14

RED-14

BLU-14

MAIN ON/OFF SWITCH

(Late Models only)

BLK-14

BLU

L3

RED

BLK

34916.0001E 06/09 © 2002 Bunn-O-Matic Corporation

120/208 OR 120/240 VOLT A.C.

4 WIRE + GND 3-PHASE

SCHEMATIC WIRING DIAGRAM

DUAL TF DBC BREWWISE

CONTACTOR

WHI

WHI

WHI

WHI

WHI

WHI

K

LEFT LIMIT

THERMOSTAT

RIGHT LIMIT

THERMOSTAT

RIGHT

TANK HEATER

LEFT

TANK HEATER

N

CENTER LIMIT

THERMOSTAT

MT1 BLU-14

MT2

CENTER

TANK HEATER

WHI/VIO-14WHI/VIO-14RED-14

RED-14

BLU-14

BLU-14

TRIAC

N.O.

BLK-14

BLK-14 BLK-14 BLK-14

BLK-14

SWITCH UNIT ASSY

L1L2 L3L4 L5 L6 L7 L8

C1 A1 A2 A3 A4B1 B2D1 D2 D3C2 C3 C4 C5 C6

20

1

SHIELD

LEFT

FUNNEL SENSOR

RIGHT

FUNNEL SENSOR

VIO

VIO

YEL

WATER LEVEL

PROBE

TEMP PROBE

WHI/VIO

WHI/YEL

WHI

WHI
BRN/WHI
BRN/BLK

BLU/BLK

BLU

PNK
BLK

BLK

RED/BLK

GRN

GRY

ORN

CONTROL PC BOARD

WHI/ORN
WHI/GRN

T AN

YEL

REFILL

SOL

SOL

SOL

SOL

SOL

SOL

SOL

R. BYPASS

L. BYPASS

R. BREW

L. BREW

RED

RED

N.C.

OVERFLOW

PROTECTION SWITCH

L. FUNNEL LOCK

R. FUNNEL LOCK

J11-1

J11-5

J11-10

J11-18

J9-1

J2-1

J2-5

J2-10

J9-5

J4-1

J4-5

J4-10

J4-15

J4-20

Switch Unit Assembly Codes

A1 Left Brew
A2 Left On/Off
A3 Right On/Off
A4 Right Brew
B1 "Hidden" Left
B2 "Hidden" Right
C1 Left Large Batch
C2 Left Medium Batch

C3 Left Small Batch
C4 Right Large Batch
C5 Right Medium Batch
C6 Right Small Batch
D1 "Digital" Left Hidden Button
D2 "Brewer" Center Hidden Button
D3 "Control" Right Hidden Button

LED's
L1 Left Large Batch LED
L2 Left Medium Batch LED
L3 Left Small Batch LED
L4 Left On/Off LED
L5 Right On/Off LED
L6 Right Large Batch LED
L7 Right Medium Batch LED
L8 Right Small Batch LED

N.O.

Page 45

41746 070209

34839.0000B 10/05 © 2003 Bunn-O-Matic Corporation

200/230 VOLT A.C.

2 WIRE

SINGLE PHASE

SCHEMATIC WIRING DIAGRAM

DUAL TF DBC BREWWISE

RIGHT

LIMIT THERMOSTAT (1/2)

LEFT

LIMIT THERMOSTAT (1/2)

RIGHT LIMIT

THERMOSTAT (1/2)

LEFT LIMIT

THERMOSTAT (1/2)

RED

RED-14

RED-14

RED

RED

RED

RED

RED

RED

L2

RED

BLK

BLK-14BLK-14

BLK-14 BLK-14

L2

L1

L4

L5

L6

L7

L8

L3

BLK

RED

RED

EMI

FILTER

GRN/YEL

BLK

BLK

L1

RIGHT

MT1

BLU-14

MT 1 BLU-14

R

E

D

­1
4

LEFT

TANK HEATER

TANK HEATER

TRIAC

MT2

MT2

SWITCH UNIT ASSY

TRIAC

C6

C5

C4

A4

B2

A3

B1

A2

D3

A1

D2

C3

D1

C2

C1

SHIELD

1

LEFT

FUNNEL SENSOR

RIGHT

FUNNEL SENSOR

J9-1

VIO

WHI

PNK
BLK

GRN

TEMP PROBE

WATER LEVEL

PROBE

A1 Left Brew
A2 Left On/Off
A3 Right On/Off
A4 Right Brew
B1 "Hidden" Left
B2 "Hidden" Right
C1 Left Large Batch
C2 Left Medium Batch

L1 Left Large Batch LED
L2 Left Medium Batch LED
L3 Left Small Batch LED
L4 Left On/Off LED
L5 Right On/Off LED
L6 Right Large Batch LED
L7 Right Medium Batch LED
L8 Right Small Batch LED

C3 Left Small Batch
C4 Right Large Batch
C5 Right Medium Batch
C6 Right Small Batch
D1 "Digital" Left Hidden Button
D2 "Brewer" Center Hidden Button
D3 "Control" Right Hidden Button

YEL

WHI/VIO

WHI/YEL

J9-5

CONTROL PC BOARD

J2-1

J2-5

J2-10

Switch Unit Assembly Codes

LED's

20

VIO

WHI/ORA

WHI/GRN

ORA

GRY

TAN
TAN

YEL
BLK

BRN/WHI

BRN/BLK

BLU

BLU/BLK

SOL

SOL

SOL

SOL

SOL

REFILL

R. BYPASS

L. BYPASS

R. BREW

L. BREW

J4-19

J4-15

J4-10

J4-5J4-5

J4-1

J11-1

J11-5

J11-10

J11-18

RED RED

SOL

SOL

N.C.

OVERFLOW

PROTECTION SWITCH

L. FUNNEL LOCK

R. FUNNEL LOCK

Page 46

41746 112008

34839.0002D 02/07 © 2004 Bunn-O-Matic Corporation

200,208 or 240 VOLT A.C.

2 WIRE + GND
SINGLE PHASE

50/60 HZ

SCHEMATIC WIRING DIAGRAM

DUAL TF DBC BREWWISE

LIMIT

THERMOSTAT

LIMIT

THERMOSTAT

RED

RED

RED

RED

RED

RED-14

RED-14

BLK-14 BLK-14

BLK-14 BLK-14

L2

L1

L4

L5

L6

L7

L8

L3

RIGHT

MT1

BLU-14

MT 1 BLU-14

R
E
D

­1
4

LEFT

TANK HEATER

TANK HEATER

TRIAC

MT2

MT2

SWITCH UNIT ASSY

TRIAC

C6

C5

C4

A4

B2

A3

B1

A2

D3

A1

D2

C3

D1

C2

C1

SHIELD

1

LEFT

FUNNEL SENSOR

RIGHT

FUNNEL SENSOR

J9-1

VIO

WHI

PNK

BLK

GRN

TEMP PROBE

WATER LEVEL

PROBE

A1 Left Brew
A2 Left On/Off
A3 Right On/Off
A4 Right Brew
B1 "Hidden" Left
B2 "Hidden" Right
C1 Left Large Batch
C2 Left Medium Batch

L1 Left Large Batch LED
L2 Left Medium Batch LED
L3 Left Small Batch LED

L4 Left On/Off LED
L5 Right On/Off LED
L6 Right Large Batch LED
L7 Right Medium Batch LED
L8 Right Small Batch LED

C3 Left Small Batch
C4 Right Large Batch
C5 Right Medium Batch
C6 Right Small Batch
D1 "Digital" Left Hidden Button
D2 "Brewer" Center Hidden Button
D3 "Control" Right Hidden Button

YEL

WHI/VIO

WHI/YEL

J9-5

CONTROL PC BOARD

J2-1

J2-5

J2-10

Switch Unit Assembly Codes

LED's

20

VIO

WHI/ORA

WHI/GRN

ORA

GRY

TAN
TAN
YEL
BLK

BRN/WHI

BRN/BLK

BLU

BLU/BLK

SOL

SOL

SOL

SOL

SOL

REFILL

R. BYPASS

L. BYPASS

R. BREW

L. BREW

J4-19

J4-15

J4-10

J4-5 J4-5

J4-1

J11-1

J11-5

J11-10

J11-18

RED RED

SOL

SOL

N.C.

OVERFLOW

PROTECTION SWITCH

L. FUNNEL LOCK

R. FUNNEL LOCK

RED

GRN

L1

BLK-14

RED-14

RED-14

BLK-14

MAIN ON/OFF SWITCH ONLY

(Late Models only)

L2

RED

BLK

BLK-14

Page 47

41746 112008

34839.0003C 09/06 © 2005 Bunn-O-Matic Corporation

400-415 VOLT A.C.
PHASE TO PHASE,

230 VOLTS AC

PHASE TO NEUTRAL

3 PHASE 50/60 HZ

RED

RED

RED

RED

RED

REDRED

L2

L1

L4

L5

L6

L7

L8

L3

SWITCH UNIT ASSY

C6

C5

C4

A4

B2

A3

B1

A2

D3

A1

D2

C3

D1

C2

C1

SHIELD

1

LEFT

FUNNEL SENSOR

RIGHT

FUNNEL SENSOR

J9-1

VIO

WHI

PNK
BLK

GRN

TEMP PROBE

WATER LEVEL

PROBE

A1 Left Brew
A2 Left On/Off
A3 Right On/Off
A4 Right Brew
B1 "Hidden" Left
B2 "Hidden" Right
C1 Left Large Batch
C2 Left Medium Batch

L1 Left Large Batch LED
L2 Left Medium Batch LED
L3 Left Small Batch LED
L4 Left On/Off LED
L5 Right On/Off LED
L6 Right Large Batch LED
L7 Right Medium Batch LED
L8 Right Small Batch LED

C3 Left Small Batch
C4 Right Large Batch
C5 Right Medium Batch
C6 Right Small Batch
D1 "Digital" Left Hidden Button
D2 "Brewer" Center Hidden Button
D3 "Control" Right Hidden Button

YEL

WHI/VIO

WHI/YEL

J9-5

CONTROL PC BOARD

J2-1

J2-5

J2-10

Switch Unit Assembly Codes

LED's

20

VIO

WHI/ORA

WHI/GRN

ORA

GRY

YEL
BLK

RED/BLK

BRN/WHI

BRN/BLK

BLU

BLU/BLK

SOL

SOL

SOL

SOL

SOL

BREWER

ON/OFF
SWITCH

REFILL

R. BYPASS

L. BYPASS

R. BREW

L. BREW

J4-19

J4-15

J4-10

J4-5J4-5

J4-1

J11-1

J11-5

J11-10

J11-18

RED RED

SOL

SOL

N.C.

OVERFLOW

PROTECTION SWITCH

L. FUNNEL LOCK

R. FUNNEL LOCK

RED

RED

SCHEMATIC WIRING DIAGRAM

DUAL TF DBC, CE 3 PHASE W/NEUTRAL

TANK HEATER #2

TANK HEATER #1

BLK

BLK

BLK-14

LIMIT THERMOSTAT #2 (1/2)

LIMIT THERMOSTAT #1 (1/2)

RED

RED

RED

RED

BLU

BRN

BLU

BLU

BRN

BRN

RED

TANK HEATER #3

LIMIT THERMOSTAT#3 (1/2)

RED

- LINE

- LOAD

BLK

GRN

CONTACTOR

EMI FILTER

L1L1L2L2L3L3N

L1 L2 L3 N

N

TANK LID ASEMBLY

BLK

RED

BRN

BLU

TERMINAL BLOCK

THERMOSTAT #1 (1/2)

THERMOSTAT #2 (1/2)

THERMOSTAT #3 (1/2)

Wire as shown for 3 phase. For single
phase operation, move red wire in
terminal block into cell with black wire;
apply power across L1 & N.

21

21

21

3

3

3

4

4

4

RED/BLK

HEATER

#1

#2

HEATER

#1

LIMIT

#3

#2

LIMIT

HEATER

LIMIT

#3

21

43

21

43

21

43

BLK

RED

2.2uF

Page 48

41746 112008

BLK-14

GRN/YEL

L2

L1

BLU-14

BLU-14

BLK-14

RED-14RED-14

RED-14

BLU-14

BLK-14

BLU

L3

RED

BLK

34916.0003A 02/10 © 2010 Bunn-O-Matic Corporation

120/208 OR 120/240 VOLT A.C.

4 WIRE + GND 3-PHASE or 1-PHASE

SCHEMATIC WIRING DIAGRAM

DUAL TF DBC BREWWISE

CONTACTOR

WHI

WHI

WHI

WHI

WHI

WHI

K

LEFT LIMIT

THERMOSTAT

RIGHT LIMIT

THERMOSTAT

RIGHT

TANK HEATER

LEFT

TANK HEATER

N

CENTER LIMIT
THERMOSTAT

MT1 BLU-14

MT2

CENTER

TANK HEATER

WHI/VIO-14WHI/VIO-14RED-14

RED-14

BLU-14

BLU-14

TRIAC

N.O.

BLK-14

BLK-14 BLK-14 BLK-14

BLK-14

SWITCH UNIT ASSY

L1L2 L3L4 L5 L6 L7 L8

C1 A1 A2 A3 A4B1 B2D1 D2 D3C2 C3 C4 C5 C6

20

1

SHIELD

LEFT

FUNNEL SENSOR

RIGHT

FUNNEL SENSOR

VIO

VIO

YEL

WATER LEVEL

PROBE

TEMP PROBE

WHI/VIO

WHI/YEL

WHI

WHI
BRN/WHI
BRN/BLK

BLU/BLK

BLU

PNK
BLK

BLK

RED/BLK

GRN

GRY

ORN

CONTROL PC BOARD

WHI/ORN
WHI/GRN

T AN
YEL

REFILL

SOL

SOL

SOL

SOL

SOL

SOL

SOL

R. BYPASS

L. BYPASS

R. BREW

L. BREW

RED

RED

N.C.

OVERFLOW

PROTECTION SWITCH

L. FUNNEL LOCK

R. FUNNEL LOCK

J11-1

J11-5

J11-10

J11-18

J9-1

J2-1

J2-5

J2-10

J9-5

J4-1

J4-5

J4-10

J4-15

J4-20

Switch Unit Assembly Codes

A1 Left Brew
A2 Left On/Off
A3 Right On/Off
A4 Right Brew
B1 "Hidden" Left
B2 "Hidden" Right
C1 Left Large Batch
C2 Left Medium Batch

C3 Left Small Batch
C4 Right Large Batch
C5 Right Medium Batch
C6 Right Small Batch
D1 "Digital" Left Hidden Button
D2 "Brewer" Center Hidden Button
D3 "Control" Right Hidden Button

LED's
L1 Left Large Batch LED
L2 Left Medium Batch LED
L3 Left Small Batch LED
L4 Left On/Off LED
L5 Right On/Off LED
L6 Right Large Batch LED
L7 Right Medium Batch LED
L8 Right Small Batch LED

N.O.

WHIWHI

• For 3 phase operation, wire as shown.

• For single phase operation, move BLU
wire into cell with black wire; apply
power across L1, L2 & N.

Page 49

41746 040410

BLK-14

GRN/YEL

L2

L1

BLU-14

BLU-14

BLK-14

RED-14RED-14

RED-14

BLU-14

BLK-14

BLU

L3

RED

BLK

34916.0004B 03/10 © 2010 Bunn-O-Matic Corporation

208 OR 240 VOLT A.C.

3 WIRE + GND 3-PHASE or 1-PHASE

SCHEMATIC WIRING DIAGRAM

DUAL TF DBC BREWWISE

CONTACTOR

WHI

WHI

WHI

WHI

WHI

WHI

K

LEFT LIMIT

THERMOSTAT

RIGHT LIMIT

THERMOSTAT

RIGHT

TANK HEATER

LEFT

TANK HEATER

CENTER LIMIT
THERMOSTAT

MT1 BLU-14

MT2

CENTER

TANK HEATER

WHI/VIO-14WHI/VIO-14RED-14

RED-14

BLU-14

BLU-14

TRIAC

N.O.

BLK-14

BLK-14 BLK-14 BLK-14

BLK-14

SWITCH UNIT ASSY

L1L2 L3L4 L5 L6 L7 L8

C1 A1 A2 A3 A4B1 B2D1 D2 D3C2 C3 C4 C5 C6

20

1

SHIELD

LEFT

FUNNEL SENSOR

RIGHT

FUNNEL SENSOR

VIO

VIO

YEL

WATER LEVEL

PROBE

TEMP PROBE

WHI/VIO

WHI/YEL

WHI

WHI

BRN/WHI

BRN/BLK

BLU/BLK

BLU

PNK
BLK

BLK

RED/BLK

GRN

GRY

ORN

CONTROL PC BOARD

WHI/ORN

WHI/GRN

T AN

YEL

REFILL

SOL

SOL

SOL

SOL

SOL

SOL

SOL

R. BYPASS

L. BYPASS

R. BREW

L. BREW

RED

RED

N.C.

OVERFLOW

PROTECTION SWITCH

L. FUNNEL LOCK

R. FUNNEL LOCK

J11-1

J11-5

J11-10

J11-18

J9-1

J2-1

J2-5

J2-10

J9-5

J4-1

J4-5

J4-10

J4-15

J4-20

Switch Unit Assembly Codes

A1 Left Brew
A2 Left On/Off
A3 Right On/Off
A4 Right Brew
B1 "Hidden" Left
B2 "Hidden" Right
C1 Left Large Batch
C2 Left Medium Batch

C3 Left Small Batch
C4 Right Large Batch
C5 Right Medium Batch
C6 Right Small Batch
D1 "Digital" Left Hidden Button
D2 "Brewer" Center Hidden Button
D3 "Control" Right Hidden Button

LED's
L1 Left Large Batch LED
L2 Left Medium Batch LED
L3 Left Small Batch LED
L4 Left On/Off LED
L5 Right On/Off LED
L6 Right Large Batch LED
L7 Right Medium Batch LED
L8 Right Small Batch LED

N.O.

• For 3 phase operation, wire as shown.

• For single phase operation, move BLU
wire into cell with black wire; apply
power across L1, L2.

BLK

RED

0

120

208
240

TRANSFORMER

(For locations

w/o nuetral)

WHI

WHI

Page 50

41746 040210