CWT TWIN
CWTF TWIN
CWTF TWIN-APS
INTRODUCTION
This equipment will brew one or two half-gallon batches of coffee simultaneously into awaiting dispensers
(with just the press of a button). One side may include a hot water faucet for allied beverage use. It is only for
indoor use on a sturdy counter.
BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY
Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows:
1) All equipment other than as specifi ed 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 fi rst.
These warranty periods run from the date of installation BUNN warrants that the equipment manufactured by
it will be commercially free of defects in material and workmanship existing at the time of manufacture and
appearing within the applicable warranty period. This warranty does not apply to any equipment, component or
part that was not manufactured by BUNN or that, in BUNN’s judgment, has been affected by misuse, neglect,
alteration, improper installation or operation, improper maintenance or repair, damage or casualty. This warranty is
conditioned on the Buyer 1) giving BUNN prompt notice of any claim to be made under this warranty by telephone
at (217) 529-6601 or by writing to Post Offi ce Box 3227, Springfi eld, 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 modifi cations 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 specifi ed 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 profi ts, 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.
Page 2
10737 082903
USER NOTICES
Carefully read and follow all notices in this manual and on the equipment. All labels on the equipment should
be kept in good condition. Replace any unreadable or damaged labels.
#12364.0000
Page 3
ELECTRICAL REQUIREMENTS
WARNING - The brewer must be disconnected from the power source until specifi ed in Initial Set-Up.
Refer to Data Plate on the Brewer, and local/national electrical codes to determine circuit requirements.
RED
L2
WHI
N
BLK
L1
GREEN GREEN
120V. A.C.
208 or 240V. A.C.
120V. A.C.
P1843
120/208 & 120/240V ac
single phase models
Note: This electrical service
consists of 3 current carrying
conductors (Neutral, L1 and
L2) and a separate conductor
for earth ground.
Some 4/2 & 0/6 models
require two individual branch
circuits.
BLU
L3
RED
L2
BLK
L1
GREEN GREEN
230V. A.C.
230V. A.C.
230V. A.C.
P1843
230V ac
3 phase models
Note: This electrical service
consists of 3 current carrying conductors (L1, L2 and
L3) and a separate conduc-
tor for earth ground.
BLK
L1
RED
L2
GREEN GREEN
200 or 230V. A.C.
P1842
200 or 230V ac
single phase models
Note: This electrical service
consists of 2 current carrying conductors (L1 and L2)
and a separate conductor
for earth ground.
ELECTRICAL HOOK-UP
CAUTION – Improper electrical installation will damage electronic components.
1. An electrician must provide electrical service as specifi ed.
2. Using a voltmeter, check the voltage and color coding of each conductor at the electrical source.
3. Place the heater switchs at the rear of the brewer in the "OFF" lower position.
4. Remove the front panel beneath the sprayheads.
5. Feed the cord through the strain relief(s) and connect it to the terminal block(s).
6. Connect the brewer to the power source and verify the voltage at the terminal block before proceeding. Re-
place the front panel.
7. If plumbing is to be hooked up later be sure the brewer is disconnected from the power source. If plumbing
has been hooked up, the brewer is ready for Initial Set-Up.
Page 4
10737 081706
PLUMBING REQUIREMENTS
These brewers must be connected to a cold water system with operating pressure between 20 and 90 psi
(138 and 620 kPa) from a 1⁄2" or larger supply line. A shut-off valve should be installed in the line before the
brewer. Install a regulator in the line when pressure is greater than 90 psi (620 kPa) to reduce it to 50 psi (345
kPa) . The water inlet fi tting is
3
⁄8" fl are.
NOTE - Bunn-O-Matic recommends
3
⁄8" copper tubing from the 1⁄2" water supply line. A tight coil of copper tubing
in the water line will facilitate moving the brewer to clean the countertop. Bunn-O-Matic does not recommend
the use of a saddle valve to install the brewer. The size and shape of the hole made in the supply line by this type
of device may restrict water fl ow.
This equipment must be installed to comply with the Basic Plumbing Code of the Building
Offi cials and Code Administrators International, Inc. (BOCA) and the Food Service Sanitation
Manual of the Food and Drug Administration (FDA). For models installed outside the U.S.A.,
you must comply with the applicable Plumbing/Sanitation codes for your area.
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P1241
Models CWT & CWTF
1. Remove cap from the fl ared fi tting on the bottom
of the center tube assembly.
2. Flush the water line and securely attach it to the
fl are fi tting on the center tube assembly.
3. Turn on the water supply.
4. On models with faucet place an empty vessel
beneath the faucet and lift the handle until water
is dispensed.
Page 5
10737 081706
INITIAL SET-UP
CAUTION - The brewer must be disconnected from the power source throughout the initial set-up, except
when specifi ed in the instructions.
1. Insert an empty funnel into the funnel rails.
2. Place an empty dispenser under the funnel.
3. Place the heater switch at the rear of the brewer in the "OFF" lower position.
4. Connect the brewer to the power source, place the "ON/OFF" switch in the "ON" upper position, and momentarily
press and release the start switch. Water will begin fl owing into the tank. When water stops fl owing into
the tank, initiate a second and a third brew cycle. During the third brew cycle the tank will fi ll to its capacity
and the excess will fl ow from the sprayhead, out of the funnel, and into the dispenser.
5. When the fl ow of water from the funnel stops, place the heater switch at the rear of the brewer in the "ON"
upper position and wait approximately twenty minutes for the water in the tank to heat to the proper temperature. Some water will drip from the funnel during this time; this is due to expansion and should not occur
thereafter.
6. Empty the dispenser, place the "ON/OFF" switch in the "ON" upper position, and momentarily press and release
the start switch.
7. Place the "ON/OFF" switch in the lower "OFF" position after water has stopped fl owing from the funnel, and
let the water in the tank reheat to the proper temperature.
8. Empty the dispenser, place the "ON/OFF" switch in the "ON" upper position, and momentarily press and release
the start switch. Check the water volume in the dispenser after water has stopped fl owing from the funnel.
It should be 64 ounces.
9. If not, adjust the timer as required. Refer to Adjusting Brew Volumes.
10. Repeat steps 8 & 9 until 64 oz water volume is achieved.
NOTE: Repeat steps 1 through 10 for the other side.
11. The brewer is now ready for use in accordance with the coffee brewing instructions on the next page.
ADJUSTING BREW VOLUMES
CAUTION - Disconnect the power source from the brewer prior to the removal of any panel for the replacement
or adjustment of any component.
NOTE: Prior to setting or modifying batch sizes, check that the brewer is connected to water supply, the tank is
properly fi lled, and a funnel and server are in place.
1. Modifying batch sizes. To modify a batch volume, fi rst check that the SET/LOCK switch is in the "SET" posi-
tion on the circuit board.
To increase a batch size. Press and hold the START or BREW switch until three clicks are heard. Release
the switch (Failure to release the switch within two seconds after the third click causes the volume setting to
be aborted and previous volume setting will remain in memory) and press it again one or more times. Each
time the switch is pressed, two seconds are added to the brew time period. Allow the brew cycle to fi nish in
order to verify that the desired volume has been achieved.
To decrease a batch size. Press and release the START or BREW switch once for every two-second interval
to be removed from the total brew time period; then immediately press and hold down the START or BREW
switch until three clicks are heard. Release the switch. (Failure to release the switch within two seconds after
the third click causes the volume setting to be aborted and previous volume setting will remain in memory).
Allow the brew cycle to fi nish in order to verify that the desired volume has been achieved.
Page 6
10737 100801
ADJUSTING BREW VOLUMES (Cont.)
2. Setting batch sizes. To set a batch volume, fi rst check that the SET/LOCK switch is in the "SET" position on
the circuit board. Press and hold the START or BREW switch until three distinct clicks are heard, and then
release the switch. (Failure to release the switch within two seconds after the third click causes the volume
setting to be aborted and previous volume setting will remain in memory). View the level of the liquid being
dispensed. When the desired level is reached, turn the ON/OFF switch to "OFF" (lower). The brewer remembers
this volume and will continue to brew batches of this size until the volume setting procedure is repeated.
NOTE: When brewing coffee, batch volumes will decrease due to absorption by the coffee grounds.
3. Setting programming disable feature. If it becomes necessary to prevent anyone from changing brew times
once programmed, you can set the SET/LOCK switch to the "LOCK" position. This will prevent any programming to be done until switch is once again placed in the "SET" position.
OPERATING CONTROLS
ON/OFF SWITCH
Placing the "ON/OFF" switch in the "OFF" lower position stops brewing. Stopping a brew cycle after it has
been started will not stop the fl ow of water into the funnel until the tank syphons down to its proper level. Placing the switch in the "ON" upper position enables the brew circuit and on all except APS models, supplies power
to the brew station warmer.
START SWITCH
Momentarily pressing and releasing the switch starts a brew cycle when the "ON/OFF" switch is in the "ON"
upper position.
NOTE – The "ON/OFF" switch must be in the "ON" upper position to initiate and complete a brew cycle.
COFFEE BREWING
1. Insert a BUNN® fi lter into the funnel.
2. Pour the fresh coffee into the fi lter and level the bed of grounds by gently shaking.
3. Slide the funnel into the funnel rails.
4. Place an empty dispenser beneath the funnel.
5. Place the "ON/OFF" switch in the "ON" upper position. Momentarily press and release the start switch.
6. When brewing is completed, simply discard the grounds and fi lter.
CLEANING
1. The use of a damp cloth rinsed in any mild, non-abrasive, liquid detergent is recommended for cleaning all
surfaces on Bunn-O-Matic equipment.
2. Check and clean the sprayhead. The sprayhead holes must always remain open.
3. With the sprayhead removed, insert the deliming spring (provided) all the way into the sprayhead tube.
When inserted properly, no more than two inches of spring should be visible. Saw back and forth fi ve or six
times.
NOTE – In hard water areas, this may need to be done daily. It will help prevent liming problems in the brewer
and takes less than a minute.
Page 7
10737 100801
TROUBLESHOOTING
A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems
encountered. If the problem remains after exhausting the troubleshooting steps, contact the Bunn-O-Matic
Technical Service Department.
• Inspection, testing, and repair of electrical equipment should be performed only by qualifi ed service personnel.
• All electronic components have 120 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 permanent. 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 solenoids are
energized for more than ten minutes without a supply of water.
• The use of two wrenches is recommended whenever plumbing fi ttings are tightened or loosened. This will
help to avoid twists and kinks in the tubing.
• Make certain that all plumbing connections are sealed and electrical connections tight and isolated.
• This brewer is heated at all times. Keep away from combustibles.
WARNING – • Exercise extreme caution when servicing electrical equipment.
• Unplug the brewer when servicing, except when electrical tests are specifi ed.
• Follow recommended service procedures
• Replace all protective shields or safety notices
PROBLEM
Brew cycle will not start
PROBABLE CAUSE
1. No water
2. No power or incorrect voltage
to the brewer
REMEDY
Water lines and valves to the
brewer must be open.
(A1) Check the terminal block for
120 volts across the red and white
terminals and the black and white
terminal on three wire 120/240
volt brewers.
(A2) Check the terminal block for
200 volts ac across the red and
black terminals for two wire 200
volts on "B Series" brewers.
(A3) Check the terminal block for
230 volts ac across the red and
black terminals on three wire 230
volts "A Series" brewers or 240
volts ac on two wire 240 volt "A
Series" brewers.
Page 8
(B) Check circuit breakers or
fuses.
10737 061597
TROUBLESHOOTING (cont.)
PROBLEM
Brew cycle will not start (cont.)
PROBABLE CAUSE
3. ON/OFF Switch
4. Start Switch
5. Timer
6. Solenoid Valve
7. Water strainer/flow control
(.222 GPM)
REMEDY
Refer to Service - ON/OFF Switch
for testing. See page 16
Refer to Service - Start Switch for
testing procedures. See page 20
Refer to Service - Timer for testing
procedures. See page 24 or 25
Refer to Service - Solenoid Valve
for testing procedures. See page
19
(A) Direction of fl ow arrow must
be pointing towards brewer.
(B) Remove the strainer/fl ow control and check for obstructions.
Clear or replace.
Water is not hot
1. Tank Heater Switch
2. Limit Thermostat
CAUTION - Do not eliminate or
bypass limit thermostat. Use only
BOM part #29329.1000
3. Control Thermostat
4. Tank Heater
5. Recovery Booster (CWT 2/2,
CWTF 2/2 & 0/6 Only)
Refer to Service - Tank Heater
Switch for testing procedures.
See page 22
Refer to Service - Limit Thermostat for testing procedures. See
page 16
Refer to Service - Control Thermostat for testing procedures.
See page 15
Refer to Service - Tank Heater for
testing procedures. See page 21
Refer to Service - Recovery
Booster for testing procedures.
See page 18
Page 9
10737 120800
TROUBLESHOOTING (cont.)
PROBLEM
Inconsistent beverage level in
dispenser
PROBABLE CAUSE
1. Strainer/flow control (.222
GPM)
2. Syphon System
3. Lime Build-up
CAUTION - Tank and tank compo-
nents should be delimed regularly
depending on local water conditions. Excessive mineral build-up
on stainless steel surfaces can
initiate corrosive reactions resulting in serious leaks.
REMEDY
(A) Direction of fl ow arrow must be
pointing towards the brewer.
(B) Remove the strainer/flow
control and check for obstruction.
Clear or replace.
The brewer must be level or
slightly lower in front to syphon
properly.
Inspect the tank assembly for
excessive lime deposits. Delime
as required.
Consistently low beverage level in
the dispenser
Spitting or excessive steaming
4. Water Pressure
1. Timer
2. Strainer/fl ow Control (.222
GPM)
1. Lime Build-up
CAUTION - Tank and tank compo-
nents should be delimed regularly
depending on local water conditions. Excessive mineral build-up
on stainless steel surfaces can
initiate corrosive reactions resulting in serious leaks.
The water pressure to the brewer
must be at least 20 psi (138
kPa).
(A) Early Models - Timer dial must
indicate at least two minutes and
fi fteen seconds.
(B) Late Models - Refer to Service
- Digital Timer for testing procedures. See page 25
(A) Direction of fl ow arrow must
be pointing towards brewer.
(B) Remove the strainer/fl ow control and check for obstructions.
Clear or replace.
Inspect tank assembly for excessive lime deposits. Delime as
required.
Page 10
10737 120800
TROUBLESHOOTING (cont.)
PROBLEM
Spitting or excessive steaming
(cont.)
Dripping from sprayhead
Water fl ows into tank continuously
(ON/OFF Switch "ON")
Water fl ows into tank continuously
(ON/OFF Switch "OFF")
Beverage overfl ows dispenser
PROBABLE CAUSE
2. Control Thermostat
1. Syphon System
2. Lime Build-up
CAUTION - Tank and tank compo-
nents should be delimed regularly
depending on local water conditions. Excessive mineral build-up
on stainless steel surfaces can
initiate corrosive reactions resulting in serious leaks.
3. Solenoid Valve
1. Timer
1. Solenoid Valve
1.Dispenser
2. Timer
3. Solenoid Valve
REMEDY
Refer to Service - Control Thermostat for testing procedures.
See page 15
The brewer must be level or
slightly lower in front to syphon
properly.
Inspect the tank assembly for
excessive lime deposits. Delime
as required.
Remove the solenoid valve and
clear any obstructions. Rebuild or
replace the valve if necessary.
See page 19
Refer to Service - Timer for testing
procedures. See page 24 or 25
Remove the Solenoid Valve and
clean any obstruction. Rebuild
or replace the valve if necessary.
See page 19
The dispenser must be completely
empty before starting a brew
cycle.
Refer to Service - Timer for testing
procedures. See page 24 or 25
Page 11
Remove the Solenoid Valve and
clean any obstruction. Rebuild
or replace the valve if necessary.
See page 19
10737 120800
TROUBLESHOOTING (cont.)
PROBLEM
Weak beverage
PROBABLE CAUSE
1. Filter Type
2. Coffee Grind
3. Sprayhead
4. Funnel Loading
5. Water Temperature
REMEDY
®
BUNN
paper fi lters must be used
for proper extraction.
A fi ne or drip grind must be used
for proper extraction.
A clean spray-head must be used
for proper extraction.
®
The BUNN
paper fi lter must be
centered in the funnel and the
bed of ground leveled by gentle
shaking.
Place an empty funnel on an empty
dispenser beneath the sprayhead.
Initiate a brew cycle and check the
water temperature immediately
below the sprayhead with a thermometer. The reading should not
be less than 195°F (91°C). Adjust
the control thermostat to increase
the water temperature. Replace if
necessary.
Dry coffee grounds remain in the
funnel
Brewer is making unusal noises
1. Funnel Loading
1. Solenoid
2. Plumbing Lines
3. Water Supply
The BUNN® paper fi lter must be
centered in the funnel and the
bed of grounds leveled by gently
shaking.
The nut on the solenoid must
be tight or it will vibrate during
operation.
Plumbing lines should not be resting on the counter top.
(A) The brewer must be connected
to a cold water line.
(B) Water pressure to the brewer
must not exceed 90 psi (620 kPa).
Install a regulator if necessary to
lower the working pressure to approximately 50 psi (345 kPa).
Page 12
10737 082903
TROUBLESHOOTING (cont.)
PROBLEM
Brewer is making unusal noises
(cont.)
Low beverage serving temperature
PROBABLE CAUSE
4. Tank Heater
1. Warmer
REMEDY
Remove and clean lime off the tank
heater. See page 21
Refer to Service - Warmer element for testing procedures. See
page 27
Page 13
10737 120800
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9
8
5
B
U
NN
-O-M
A
T
I
C
C
O
R
P
OR
A
TI
O
N
CAUT
I
O
N:
T
WARMERS
A
N
D SURF
AC
E
S
ARE HO
T
O
H
E
R
A
S
E
S AND SURFAC
R
E
M
AR
W
:
N
O
I
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U
A
C
S
E
ERI
S
CW
Y
D
A
ON
T
P
O
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R
A
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S
OWERT
L
/
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LY
R ON
O
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T
A
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K
O
F
F
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!
BU
R
E
T
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AN
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D
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:
D
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P
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DR
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.
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-
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5
8
9
O
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8
5
6
:
N
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A
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IN
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P
BUNN
S
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:
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C
Page 14
Page 15
Page 16
SERVICE (cont.)
ON/OFF SWITCHES (cont.)
Test Procedure:
1. Disconnect the brewer from the power source.
2. Viewing the switch from the back remove the white
or red wire from the upper terminal and the black
wire from the center terminal.
3. With a voltmeter, check the voltage across the white
wire or red wire and the black wire. Connect the
brewer to the power source. The indication must
be:
a) 120 volts ac for three wire 120/240 models.
b) 200 volts ac for two wire 200 volt models.
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for three wire three phase 230 volt
models.
4. Disconnect the brewer from the power source.
If voltage is present as described, reconnect the white
or red wire and proceed to #5.
If voltage is not present as described, refer to the Wiring
Diagrams and check the brewer wiring harness.
7. On models with faucet reinstall faucet and connect
brewer to the water supply.
8. Refer to Fig. 7 when reconnecting the wires.
WHI to Terminal Block (White
Insert on 120V or 120/240V
Models)
RED to Terminal Block (Red
Insert on 200V or 230V
Models)
BLK to Terminal Block (Black
Insert)
Terminal #1 (See chart below)
P1918
Connect wire to Terminal #1 as follows:
All Models:
Brew Station Warmer (Left) ....................................WHI/RED
Brew Station Warmer (Right) (1 power cord) .........WHI/GRN
Brew Station Warmer (Right) (2 power cords) .......WHI/RED
5. With the black wire removed, remove the wire
from the lower terminal.
6. Check for continuity across the center and lower
terminal with the switch in the "ON" position.
Continuity must not be present when the switch
is in the "OFF" position.
If continuity is present as described, reconnect the
black wire to the center terminal and the wire to the
lower terminal.
If continuity is not present as described, replace the
switch.
Removal and Replacement:
1. Remove the wires from the switch terminals.
2. On models with faucet, turn off water supply and
remove faucet.
3. Remove front end cap.
4. Compress the clips inside the hood and gently
push the switch through the opening.
5. Push the new switch into the opening and spread
the clips to hold switch in the hood.
6. Reinstall front end cap.
2/2 Models:
Left Upper Warmer ..........................................................YEL
Right Upper Warmer ................................................WHI/YEL
4/2 Models (1 power cord):
Left Front Upper Warmer .................................................YEL
Right Front Upper Warmer .......................................WHI/YEL
Left Rear Upper Warmer .......................................... WHI/VIO
Right Rear Upper Warmer ....................................... WHI/BRN
4/2 Models (2 power cords):
Left Front Upper Warmer ........................................ BRN/BLK
Right Front Upper Warmer ...................................... BRN/BLK
Left Rear Upper Warmer .................................................. VIO
Right Rear Upper Warmer ................................................ VIO
0/6 Models (1 power cord):
Left Front Warmer ............................................................YEL
Left Rear Warmer ..................................................... WHI/VIO
Right Front Warmer ................................................ BRN/BLK
Right Rear Warmer .......................................................... VIO
0/6 Models (2 power cords):
Left Front Warmer ................................................... BRN/BLK
Left Rear Warmer ............................................................. VIO
Right Front Warmer ................................................ BRN/BLK
Right Rear Warmer .......................................................... VIO
FIG. 7 ON/OFF SWITCH WIRING
Page 17
10737 100801
Page 18
Page 19
SERVICE (cont.)
START SWITCHES
APS Models
Page 20
Page 21
Page 22
SERVICE (cont.)
Diagrams and check the brewer wiring harness.
5. Check for continuity between the black wire removed from the limit thermostat and the black
insert on the terminal block. with the tank heater
switch in the "ON" upper position. Continuity should
not be present in the "OFF" lower position.
If continuity is present as described, the tank heater
switch is operating properly.
If continuity is not present as described, replace the
tank heater switch.
Removal and Replacement:
1. Shut off and disconnect the incoming water supply
to the brewer.
2. On automatic brewers gently remove the fi ll tube
from back of fi ll basin.
3. Remove the tank inlet fi tting securing fi ll basin the
tank lid. Remove fi ll basin and gasket. Set all three
parts aside for reassembly.
4. On brewers with faucets, disconnect the water
supply to coil assembly and remove the tube from
the tank to the faucet.
5. Remove sprayhead and hex nut securing sprayhead
tube to the hood. Set aside for reassembly.
6. Disconnect the wires on the limit thermostat and
the tank heater and the control thermostat (early
models).
7. Gently pull the thermostat sensor and grommet
from the tank lid.
8. Insert a tube to the bottom of the tank and syphon
ALL of the water out.
9. Gently reinstall the thermostat sensor and grommet in the tank lid.
10. Remove the two #8-32 screws securing the tank
assembly to the hood.
11. Lift tank and components out as an assembly and
set aside for reassembly.
12. Disconnect the two black wires from the tank heater
switch.
13. Remove the plastic facenut, hex facenut and the
switch indicator/guard bracket that secures tank
heater switch to the rear of the brewer. Remove
switch and discard.
14. Insert new tank heater switch through the hole
in the upper left rear of the trunk and secure with
switch indicator/guard bracket, hex facenut and
plastic facenut.
15. Reconnect the two black wires the tank heater
switch terminals.
16. Set tank assembly inside the hood on mounting
brackets and secure with two #8-32 screws.
17. Reconnect the wires to the limit thermostat, tank
heater and the control thermostat. Refer to limit
thermostat, tank heater and control thermostat sections in this manual when reconnecting wires.
18. Brewers with faucet reinstall the faucet tube and
reconnect the water supply tube to the coil assembly.
19. Secure the sprayhead tube to the hood using hex
nut.
20. Install sprayhead.
21. Install fi ll basin, inlet gasket and secure to tank lid
with tank inlet fi tting.
22. Carefully install water fi ll tube into the back of
the fi ll basin.
23. Reconnect and turn on the incoming water sup-
BLK to Limit Thermostat
BLK to Terminal Block
(Black Insert)
P1135
FIG. 18 TANK HEATER SWITCH TERMINALS
Page 23
10737 120800
O
ON
O
F
F
N
T
A
N
K
O
F
F
2
1
3
.5
BUNN-O-MATIC
P/N 2235-120 VAC
MINUTES
4
5
USE COPPER WIRE ONLY FOR
USE COPPER WIRE ONLY FOR
POWER SUPPLY CONNECTIONS
POWER SUPPLY CONNECTIONS
2
1
3
.5
BUNN-O-MATIC
P/N 2235-120 VAC
MINUTES
4
5
Page 24
Page 25
SERVICE (cont.)
DIGITAL BREW TIMER (Late Models)(cont.)
1. Modifying brew volumes. To modify a brew vol-
ume, fi rst check that the SET/LOCK switch is in the
"SET" position on the circuit board.
To increase a brew volume, place the ON/OFF
switch in the "ON" position, press and hold the START
switch until three clicks are heard. Release the switch
and press it again one or more times. (Failure to release the switch within two seconds after the third click
causes the volume setting to be aborted and previous
volume setting will remain in memory.) Each time the
switch is pressed, two seconds are added to the brew
time period. Allow the brew cycle to fi nish in order to
verify that the desired volume has been achieved.
To decrease a brew volume, place the ON/OFF
switch in the "ON" position, press and release the
START switch once for every two-second interval to
be removed from the total brew time period; then immediately press and hold down the START switch until
three clicks are heard. Release the switch. (Failure to
release the switch within two seconds after the third
click causes the volume setting to be aborted and
previous volume setting will remain in memory). Allow the brew cycle to fi nish in order to verify that the
desired volume has been achieved.
NOTE: Several ounces of water will continue to sy-
phon from the tank after turning the switch "OFF".
The brewer remembers this volume and will continue
to brew batches of this size until the volume setting
procedure is repeated.
NOTE: When brewing coffee, volume will decrease
due to absorption by the coffee grounds.
3. Setting programming disable feature. If it be-
comes necessary to prevent anyone from changing
brew time once programmed, you can set the SET/
LOCK switch to the "LOCK" position. This will prevent
any further programming until switch is once again
put into the "SET" position.
2. Setting brew volumes. To set a brew volume,
fi rst check that the SET/LOCK switch is in the "SET"
position on the circuit board. Place the ON/OFF switch
in the "ON" position, press and hold the START switch
until three distinct clicks are heard and then release
the switch. (Failure to release the switch within two
seconds after the third click causes the volume setting
to be aborted and previous volume setting will remain
in memory.)
View the level of the liquid being dispensed. When
the desired level is reached, turn the ON/OFF switch
to "OFF".
Page 26
P2037
BLU/BLK wire from TL5 to P1
WHI/GRN wire from TL4 to (WHI) Solenoid
WHI/BLU wire from TL3 to (BLK) Solenoid
WHI wire from TL2 to P2
BLK wire from TL1 to P3
FIG. 22 DIGITAL TIMER WIRING
10737 120800
ON
O
F
F
CAU
TI
ON
D
I
SC
A
RD
D
ECA
N
T
E
R
I
F
:
.
CR
A
C
K
ED
.
S
C
R
A
T
C
H
E
D
.
B
O
I
LE
D
D
R
Y
.
H
E
A
T
E
D
W
H
E
N
E
M
P
T
Y
.
U
S
E
D
O
N
H
I
G
H
F
L
AM
E
.
O
R E
X
P
O
SE
D
EL
E
CT
RI
C
E
L
EM
E
N
T
S
FAIL
UR
E
T
O
C
O
M
PL
Y
R
ISKS
I
N
J
U
R
Y
P
N
:
6
5
8
1
9
8
5
BU
N
N
-
O
-
MA
TIC C
O
R
P
O
R
A
TI
O
N
C
AUTION:
T
WARMERS A
ND
SURFACES
A
RE
HOT
O
H
E
R
A
S
E
C
A
F
R
U
S
D
N
A
S
R
E
M
R
A
W
TION:
CAU
Y
NL
O
R
O
N
T
A
N
K
O
FF
!
R
E
N
NT
A
C
IO
T
DE
D
U
A
C
DISCAR
:
D
F
I
E
Y
D
K
E
PT
H
AC
M
C
E
R
Y
E
T
C
R
M
A
.
N
D
A
C
R
I
E
L
C
D
R
F
H
S
E
T
.
W
H
L
C
I
G
E
D
I
O
L
E
H
B
E
T
.
N
A
E
O
ED
H
D
.
E
OS
S
U
.
TS
EXP
N
Y
R
E
R
O
M
.
U
E
N
J
L
O
I
E
N
T
I
A
R
S
O
P
K
R
S
O
I
C
R
C
I
T
Y
A
L
M
-
P
O
-
N
M
N
U
O
B
C
5
8
9
1
TO
E
R
U
IL
A
F
8
5
6
:
N
P
TE
A
W
IN
UR
O
P
OT
H
E
R
A
S
E
AC
F
R
U
S
D
N
A
S
R
E
M
R
A
W
:
N
O
I
T
U
A
C
Page 27
SCHEMATIC WIRING DIAGRAM
L1
SW1
SW2
SW3
SW4
BLK
MODELS 2/2 & 4/2 ONLY
SW7
CWT/CWTF TWIN 0/2, 2/2, 4/2 & CWT TWIN-APS
LT. READY INDICATOR
RED
LT.LIMIT
THERMOSTAT
LT. SW. & THERMOSTAT
BLU
WHI WHI
RT. READY INDICATOR
RED
RT. LIMIT
THERMOSTAT
RT. SW. & THERMOSTAT
BLU
WHI
(NOT AVAILABLE ON CWT TWIN-APS)
SW6
WHI/RED
WHI/GRN
P3-1
BLU BLU/BLK
P3-3
BLK
RIGHT LOWER WARMER
WHI/RED
P1-2
WHI/GRN
P1-3
WHI/GRN
WHI/GRN
T1 T5 T3
BREW TIMER
BLK
LEFT "KEEP WARM" HEATER
BLK
BLK BLK
RIGHT "KEEP WARM" HEATER
LEFT LOWER WARMER
WHI/RED
WHI/RED
RIGHT
WHI/BLU
T4
T2
RT
SOL
WHI/GRN
WHI
(FAUCET)
THERMAL
SAFETY FUSE
BLK
WHI
SW5
BLK
WHI
WHIRED
P2-1
BLU BLU/BLK
P2-3
BLK
P3-2
LEFT TANK HEATER
RIGHT TANK HEATER
P1-1
WHI/BLU
T1 T5 T3
BREW TIMER
LEFT
T4
T2
GREEN
LT
SOL
WHI/GRN
WHI
P2-2
N L2
REDBLUBLKBLK
REDBLUBLKBLK
WHI
RED
WHI
WHI
WHI
WHI
WHI
RED
WHI
P4-2
P4-3
P5-3
P5-2
SW8
BLK
MODEL 4/2 ONLY
SW9
RED
SW10
BLK
YEL YEL
WHI/YEL WHI/YEL
WHI/VIO WHI/VIO
WHI/BRN WHI/BRN
120/240 VOLTS AC 3 WIRE
SINGLE PHASE
WHI WHIRED
LEFT TOP FRONT
WARMER
P4-1
WHI
RIGHT TOP FRONT WARMER
WHI WHI
LEFT TOP REAR WARMER
P5-1
WHI
RIGHT TOP REAR WARMER
10736.0000J 10/01 © 1993 BUNN-O-MATIC CORPORATION
Page 28
WHI
WHI
RED
WHI
WHI
WHI
10737 100801
L1
SCHEMATIC WIRING DIAGRAM CWT TWIN 2/2 & 4/2
W/RECOVERY BOOSTER
GREEN
N L2
P4-2
P4-3
RED
WHI
WHI
LEFT TOP WARMER
WHI
RIGHT TOP WARMER
Page 29
SCHEMATIC WIRING DIAGRAM CWTF TWIN 0/6
L1
BLK
BLK
SW1
SW3
SW4
SW9
SW2
THERMOSTAT
WHI
THERMOSTAT
WHI
WHI/RED
WHI/RED
WHI/GRN
WHI/GRN
WHI/GRN
GRY
GRYPIN
WHI
LT.LIMIT
RT. LIMIT
P1-2
P1-3
L.E.D.L.E.D.
WHI/RED
WHI/GRN
SW7
SW8
GRY
PIN
LT. READY INDICATOR
BLU
LT. SW. & THERMOSTAT
RT. READY INDICATOR
BLKRED
RT. SW. & THERMOSTAT
LEFT BREW WARMER
RIGHT BREW WARMER
P3-1
BLU BLU/BLK
P3-3
PIN
BLK
WHI/BLU
T1 T5 T3
RIGHT
BREW TIMER
OPTIONAL
INDICATOR
TIMER
BLK
LEFT "KEEP WARM" HEATER
RIGHT "KEEP WARM" HEATER
WHI WHIRED
WHI
WHI/RED
WHI/ORA
RT
SOL
WHI/GRN
T4
WHI
T2
4
3
2
1
(FAUCET)
THERMAL
SAFETY FUSE
BLKBLUBLKBLK
P1-1
WHI/RED
P3-2
BLKBLK
RIGHT TANK HEATER
SW5
SW6
GREEN
LEFT TANK HEATER
P2-1
BLU BLU/BLK
P2-3
BLK
T1 T5 T3
LEFT
BREW TIMER
WHI/BLU
T4
T2
WHI
WHI
BLK
SOL
WHI/GRN
WHI
WHI/ORA
LT
WHI
WHI
WHI
WHI
WHI
WHI
WHI
P2-2
WHI
WHI/ORA
WHI
WHI/ORA
WHI
WHI
SW11
L2
N
REDBLUBLKBLK
RED
RED
WHI
VIO
P5-3
P5-2
BLK
BLK
BRN/BLK
SW10
120/240 VOLTS AC 3 WIRE
SINGLE PHASE
BRN/BLK
VIO
P5-1
WHI
RIGHT FRONT WARMER
P4-1
WHI
LEFT FRONT WARMER
WHI
RIGHT REAR WARMER
LEFT REAR WARMER
10741.0000G 08/03 © 1993 BUNN-O-MATIC CORPORATION
Page 30
P4-2
YEL
YEL
WHI
WHI/VIOWHI
P4-3
WHI/VIO
RED
SW12
RED
10737 081706
SCHEMATIC WIRING DIAGRAM
LEFT
BLK
L2NL1
BLK
WHI
RED
WHI
BLK
WHI
SW4-L
SW5-L
GREEN
SW2-L
WHI
WHI
CWTF TWIN 4/2 & 0/6 TWO-CIRCUIT
READY INDICATOR
RED
SW1-L
LIMIT
THERMOSTAT
BLK
SW. & THERMOSTAT
BLU
WHI
READY INDICATOR
RED
SW1-R
LIMIT
THERMOSTAT
BLK BLK
SW. & THERMOSTAT
BLU
WHI
SW3-L
P1-3L
P1-1L
BLKWHI/RED
SW3-R
WHI/RED
WHI/RED
BLU BLU/BLK
LEFT BREW WARMER
SW2-R
WHI/RED
WHI/RED
RIGHT BREW WARMER
WHI
P2-1L
P2-2L
BRN/BLK
LEFT FRONT WARMER
BLK
(FAUCET SIDE)
THERMAL
SAFETY FUSE
BLK
"KEEP WARM" HEATER
BLK
"KEEP WARM" HEATER
WHI/BLU
T1 T5 T3
BREW TIMER
BLU BLU/BLK
P1-3R
T4
T2
P1-1R
BLKWHI/RED
WHI/GRN
WHI
SW4-R
BLK
SW5-R
BLK
SOL
WHI/BLU
T1 T5 T3
BREW TIMER
WHI
BRN/BLK
WHI
TANK HEATER
TANK HEATER
P1-2L
WHI/GRN
T4
T2
WHI
P2-2R
GREEN
WHI
SOL
BRN/BLK
RIGHT FRONT WARMER
RIGHT
L2NL1
RED
WHI
BLK
WHI
P1-2R
WHI
BLK
BLK
WHI
P2-1R
VIO
P2-3L
VIOBLK
LEFT REAR WARMER
WHI
BLK
TWO INDIVIDUAL BRANCH
CIRCUITS REQUIRED
EACH RATED
120/240 VOLTS AC 3 WIRE
SINGLE PHASE
10847.0000C 12/00 © 1994 BUNN-O-MATIC CORPORATION
Page 31
VIO
P2-3R
VIO
RIGHT REAR WARMER
WHI
10737 120100
SCHEMATIC WIRING DIAGRAM CWTF TWIN 0/6 WITH
L1
BLK
BLK
SW3
SW4
L.E.D.
SW9
SW1
SW2
THERMOSTAT
WHI
THERMOSTAT
WHI
WHI/RED
WHI/RED
WHI/GRN
WHI/GRN
WHI/GRN
GRYPNK
WHI
LT.LIMIT
RT. LIMIT
GRY
P1-2
P1-3
L.E.D.
WHI/RED
WHI/GRN
SW7
SW8
PNK
LT. READY INDICATOR
LT. SW. & THERMOSTAT
BLU
BLU
BLU BLK
RT. READY INDICATOR
RT. SW. & THERMOSTAT
BLU
BLU
BLU
LEFT BREW WARMER
RIGHT BREW WARMER
P3-1
BLU
BLU/BLK
P3-3
BLK
GRY
PNK
BLK
WHI/BLU
T1 T5 T3
RIGHT
BREW TIMER
OPTIONAL
INDICATOR
TIMER
RECOVERY BOOSTER
BLKRED
(FAUCET)
THERMAL
SAFETY FUSE
BLK
BLK
BLK
K.1. N.O.
LEFT "KEEP WARM" HEATER
BLKRED
BLK
BLK
BLK
K.2. N.O.
RIGHT "KEEP WARM" HEATER
WHI
P1-1
WHI/RED
WHI/RED
WHI
P3-2
WHI WHIRED
WHI
K2
T4
T2
WHI/ORA
RT
SOL
WHI/GRN
WHI
4
3
2
1
BLKBLK
BLKBLUBLKBLK
SW5
SW6
GREEN
LEFT TANK HEATER
RIGHT TANK HEATER
P2-1
BLU BLU/BLK
BLK
P2-3
T1 T5 T3
LEFT
BREW TIMER
BLK
BLK
WHI/BLU
T4
T2
K1
BLK
LT
SOL
WHI/GRN
WHI
WHI
WHI
WHI
WHI
WHI
WHI
WHI
WHI
WHI/ORA
P2-2
WHI/ORA
WHI/ORA
WHI
WHI
WHI
WHI
WHI
SW11
L2
N
REDBLUBLKBLK
RED
RED
WHI
VIO
P5-2
P5-3
BRN/BLK
SW10
BLK
120/240 VOLTS AC 3 WIRE
SINGLE PHASE
BRN/BLK
VIO
P5-1
WHIBLK
RIGHT FRONT WARMER
WHI
RIGHT REAR WARMER
P4-1
WHI
LEFT FRONT WARMER
WHI
LEFT REAR WARMER
27693.0000D 07/03 © 1996 BUNN-O-MATIC CORPORATION
Page 32
YEL
WHI/VIO
P4-2
P4-3
YEL
WHI
WHI/VIO
RED
SW12
RED
10737 081706
SCHEMATIC WIRING DIAGRAM CWTFA
L1
TWIN 2/2, 4/2 & TWIN-APS
LT. READY INDICATOR
BLK
BLK
BLK
LEFT TANK HEATER
WHI WHI
RIGHT TANK HEATER
(FAUCET)
THERMAL
SAFETY FUSE
BLK
LEFT "KEEP WARM" HEATER
BLK BLU
LT. SW. & THERMOSTAT
BLK
RT. READY INDICATOR
RT. SW. & THERMOSTAT
BLK
WHI WHI
RIGHT "KEEP WARM" HEATER
P1-2
WHI/RED
LEFT LOWER WARMER
P1-3
WHI/GRN
RIGHT LOWER WARMER
RED RED
RED
BLK
BLK
SW3
WHI/RED
SW4
WHI/GRN
WHI/RED
SW7
SW8
SW6
WHI/GRN
WHI/GRN
YEL YEL
P4-2
P3-1
BLU BLU/BLK
P3-3
BLK
T1 T5 T3
RIGHT
BREW TIMER
LEFT TOP FRONT
WARMER
WHI/RED
WHI/BLU
T4
T2
WHI/GRN
WHI
RED REDBLK
RT
SOL
SW5
RED
BLU
REDBLK
BLU
P1-1
BLU BLU/BLK
P2-3
P3-2
P4-1
THERMOSTAT
BLU
THERMOSTAT
BLU
P2-1
BLK
T1 T5 T3
LT. LIMIT
RT. LIMIT
WHI/BLU
LEFT
BREW TIMER
BLU
BLU
T4
T2
GRN/YEL
SW1
SW2
LT
SOL
WHI/GRN
WHI
P2-2
L2 L3
BLU
RED
RED
RED
RED
RED
RED
RED
RED
RED
RED
BLK
MODEL 4/2 ONLY
BLK
BLK
WHI/YEL WHI/YEL
SW9
WHI/VIO WHI/VIO
SW10
WHI/BRN WHI/BRN
230 VOLTS AC 3 WIRE
THREE PHASE
P4-3
P5-3
P5-2
RIGHT TOP FRONT WARMER
RED
RED RED
LEFT TOP REAR WARMER
P5-1
RED
RIGHT TOP REAR WARMER
10736.0001G 02/06 © 1993 BUNN-O-MATIC CORPORATION
Page 33
RED
RED
RED
10737 120100
L1
SCHEMATIC WIRING DIAGRAM
CWTFA & CWTFB TWIN 2/2 & 4/2
L2
GRN/YEL
(FAUCET)
THERMAL
FUSE
BLK
RT. READY INDICATOR
SW2
BLK WHI/RED
THERMOSTAT
WHI/GRN
RT. LIMIT
P1-2
P1-3
RT. SW. & THERMOSTAT
BLK REDBLUBLKBLK
RIGHT TANK HEATER
P4-2
P4-3
Page 34
SCHEMATIC WIRING DIAGRAM
CWTFA 2/2 TWIN, CWTFA 4/2 TWIN & CWTFA TWIN-APS
GRN/YEL
L1 L2
SW1
BLK
LT. LIMIT
THERMOSTAT
BLK BLK
BLU
LT. READY INDICATOR
LT. SW. & THERMOSTAT
U
BL
BLK BLK
(FAUCET)
THERMAL
SAFETY FUSE
BLK
LEFT TANK HEATER
RED
BLK
BLK
SW3
WHI WHI
RIGHT TANK HEATER
BLK WHI/RED
SW4
BLK
WHI/GRN
LEFT "KEEP WARM" HEATER
BLK
NOT APPLICABLE TO APS MODELS
P1-2
WHI/RED
P1-3
WHI/GRN
SW6
WHI/GRN
WHI/GRN
NOT APPLICABLE TO APS MODELS
SW7
RT. READY INDICATOR
BLK
RT. SW. & THERMOSTAT
BLK
RIGHT "KEEP WARM" HEATER
WHI WHI
BLK
BLU
RT. LIMIT
THERMOSTAT
SW2
BLK BLU
RED
RED
RED
LEFT LOWER WARMER
RED RED
P1-1
RED
RED
RED
RIGHT LOWER WARMER
WHI/RED
WHI/RED
P3-1
BLU BLU/BLK
P3-3
BLK
WHI/BLU RT
T1 T5 T3
RIGHT
BREW TIMER
WHI/GRN
T4
WHI
T2
SW5
P2-1
BLU BLU/BLK
P2-3
SOL
P3-2
BLK
T1 T5 T3
BREW TIMER
WHI/BLU
LEFT
T4
T2
LT
SOL
WHI/GRN
WHI
P2-2
RED
RED
RED
YEL YEL
SW8
BLK
MODEL 4/2 ONLY
BLK
BLK
WHI/YEL WHI/YEL
SW9
WHI/VIO WHI/VIO
SW10
WHI/BRN WHI/BRN
230 VOLTS AC 2 WIRE
SINGLE PHASE
P4-2
P4-3
P5-3
P5-2
RED RED BLK
LEFT TOP FRONT WARMER
RED
RIGHT TOP FRONT WARMER
RED RED
LEFT TOP REAR WARMER
RED
RIGHT TOP REAR WARMER
P4-1
P5-1
10736.0004A 02/06 © 2006 BUNN-O-MATIC CORPORATION
Page 35
RED
RED
RED
RED
RED
10737 081706
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