Bunn Coffee Maker C, CT, CTF, CWT, CWTF Service Manual
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CAUTION :
CAUTIO
N
!
C, CT, CTF,
CWT, CWTF,
SINGLE CW,
SINGLE CWF
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
To ensure you have the latest revision of the Operating Manual, or to view the Illustrated Parts
Catalog, Programming Manual, or Service Manual, please visit the Bunn-O-Matic website, at
www.bunn.com. This is absolutely FREE, and the quickest way to obtain the latest catalog and
manual updates. For Technical Service, contact Bunn-O-Matic Corporation at 1-800-286-6070.
10841.0000G 10/08 ©1996 Bunn-O-Matic Corporation
BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY
Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows:
1) All equipment other than as specified below: 2 years parts and 1 year labor.
2) Electronic circuit and/or control boards: parts and labor for 3 years.
3) Compressors on refrigeration equipment: 5 years parts and 1 year labor.
4) Grinding burrs on coffee grinding equipment to grind coffee to meet original factory screen sieve analysis:
parts and labor for 3 years or 30,000 pounds of coffee, whichever comes first.
These warranty periods run from the date of installation BUNN warrants that the equipment manufactured by
it will be commercially free of defects in material and workmanship existing at the time of manufacture and
appearing within the applicable warranty period. This warranty does not apply to any equipment, component or
part that was not manufactured by BUNN or that, in BUNN’s judgment, has been affected by misuse, neglect,
alteration, improper installation or operation, improper maintenance or repair, damage or casualty. This warranty is
conditioned on the Buyer 1) giving BUNN prompt notice of any claim to be made under this warranty by telephone
at (217) 529-6601 or by writing to Post Office Box 3227, Springfield, Illinois 62708-3227; 2) if requested by
BUNN, shipping the defective equipment prepaid to an authorized BUNN service location; and 3) receiving prior
authorization from BUNN that the defective equipment is under warranty.
THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARRANTY, WRITTEN OR
ORAL, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF EITHER
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. The agents, dealers or employees of BUNN
are not authorized to make modifications to this warranty or to make additional warranties that are binding on
BUNN. Accordingly, statements by such individuals, whether oral or written, do not constitute warranties and
should not be relied upon.
If BUNN determines in its sole discretion that the equipment does not conform to the warranty, BUNN, at its
exclusive option while the equipment is under warranty, shall either 1) provide at no charge replacement parts
and/or labor (during the applicable parts and labor warranty periods specified above) to repair the defective
components, provided that this repair is done by a BUNN Authorized Service Representative; or 2) shall replace
the equipment or refund the purchase price for the equipment.
THE BUYER’S REMEDY AGAINST BUNN FOR THE BREACH OF ANY OBLIGATION ARISING OUT OF THE SALE OF
THIS EQUIPMENT, WHETHER DERIVED FROM WARRANTY OR OTHERWISE, SHALL BE LIMITED, AT BUNN’S
SOLE OPTION AS SPECIFIED HEREIN, TO REPAIR, REPLACEMENT OR REFUND.
In no event shall BUNN be liable for any other damage or loss, including, but not limited to, lost profits, lost sales,
loss of use of equipment, claims of Buyer’s customers, cost of capital, cost of down time, cost of substitute
equipment, facilities or services, or any other special, incidental or consequential damages.
BrewWISE, BrewLOGIC, BrewWIZARD, BUNN Gourmet Ice, BUNN Pour-O-Matic, BUNN, Bunn-OMatic, Bunn-O-Matic,
BUNNlink, BUNNserve, BUNN Espress, DBC, Dr. Brew, Dual, EasyClear, EasyGard, Easy Pour, FlavorGard, Gourmet Ice,
Gourmet Juice, High Intensity, IMIX, Infusion Series, Legendary for Quality, Quality Beverage Equipment Worldwide, The
Mark of Quality in Beverage Equipment Worldwide, My Café, PowerLogic, Safety-Fresh, Scale-Pro, Single, Smart Funnel,
Smart Hopper, SmartWAVE, Soft Heat, SplashGard, System III, ThermoFresh, 392, AutoPOD, AXIOM, Beverage Profit
Calculator, Beverage Bar Creator, BrewMETER, BUNNSERVE, BUNNsource, Coffee At Its Best, Cool Froth, Digital Brewer
Control, Intellisteam, Nothing Brews Like a BUNN, Pouring Profits, Pulse Wave, Signature Series, Silver Series, Smart
Heat, Tea At Its Best, The Horizontal Red Line, Titan, Ultra, are either trademarks or registered trademarks of Bunn-O-Matic
Corporation.
Page 2
10841 073108
USER NOTICES
CAUTION
POUR IN WATER ONLY
WARMERS AND SURFACES ARE HOT
This equipment must be installed to comply
with the International Plumbing Code of the
International Code Council and the Food
Code Manual of the Food and Drug Administration (FDA). For models installed outside
the U.S.A., comply with the applicable
Plumbing /Sanitation Code.
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.
#00656.0000
#00831.0000
#00658.0000
#02763.0000
#12364.0000
#37881.0000
Page 3
10841 101008
L2 RED
L1 BLACK
ELECTRICAL REQUIREMENTS
WARNING - If the power cord is ever damaged, it must be replaced by the manufacturer or its service agent with
a special cord available from the manufacturer or its service agent in order to avoid a hazard.
Refer to Data Plate on the Brewer, and local/national electrical codes to determine circuit requirements.
Model 15 has an attached cordset and requires 2-wire grounded service rated 120 volts ac, 15 amp,
single phase, 60 Hz.
Model 20 requires 2-wire,
grounded service rated 120 volts
ac, 20 amp, single phase, 60 Hz.
Proceed as follows:
Model 35 requires 3-wire,
grounded service rated 120/208
or 120/240 volts ac, 20 amp,
single phase, 60 Hz. Proceed as
follows:
“A" & "B” models require
2-wire, grounded service rated 200
volts ac or 230 volts ac, 20 amp,
single phase, 50 Hz. Proceed as
follows:
Electrical Hook-Up
CAUTION – Improper electrical installation will damage electronic components.
1. An electrician must provide electrical service as specified.
2. Using a voltmeter, check the voltage and color coding of each conductor at the electrical source.
3. Place the heater switch at the rear of the brewer in the “OFF” lower position.
4. Remove the front panel beneath the sprayhead.
5. Feed the cord through the strain relief and connect it to the terminal block.
6. Connect the brewer to the power source and verify the voltage at the terminal block before proceeding.
Replace 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.
CE REQUIREMENTS
• This appliance must be installed in locations where it can be overseen by trained personnel.
• For proper operation, this appliance must be installed where the temperature is between 0°C to 35°C.
• Appliance shall not be tilted more than 10° for safe operation.
• An electrician must provide electrical service as specied in conformance with all local and national codes.
• This appliance must not be cleaned by water jet.
• This appliance is not intended for use by persons (including children) with reduced physical, sensory or mental
capabilities, or lack of experience and knowledge, unless they have been given instructions concerning use of
this appliance by a person responsible for its safety.
• If the power cord is ever damaged, it must be replaced by the manufacturer or authorized service personnel with
a special cord available from the manufacturer or its authorized service personnel in order to avoid a hazard.
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10841 101008
PLUMBING REQUIREMENTS
Model C:
This model is completely portable and requires no attached plumbing.
Models CT, CTF, CWT, CWTA, CWTB, CWTF, CWTFA & CWTFB, SINGLE CW & SINGLE CWF
These brewers must be connected to a cold water system with operating pressure between 20 and 90 psi
(138 to 620kPa) 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 (620kPa)to reduce it to 50 psi (345kPa). The
water inlet fitting is 1⁄4" flare.
NOTE - Bunn-O-Matic recommends 1⁄4" copper tubing for installations of less than 25 feet and 3⁄8" for more than 25
feet 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 flow.
This equipment must be installed to comply with the International Plumbing Code of the
International Code Council and the Food Code Manual of the Food and Drug Administration
(FDA). For models installed outside the U.S.A., you must comply with the applicable
Plumbing/Sanitation Code for your area.
MODELS W/OUT FAUCET
MODELS W/FAUCET
Models CT, CWT, CTF, CWTF, SINGLE CW & SINGLE CWF
1. Flush the water line and securely attach it to the flare fitting on the strainer or tee.
2. Turn on the water supply.
3. On CTF, CWTF and SINGLE CWF Models, place an empty vessel beneath the faucet and lift the handle until
water is dispensed.
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10841 101008
INITIAL SET-UP
CAUTION - The brewer must be disconnected from the power source throughout the initial set-up, except
when specified 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 and connect the brewer to the
power source.
4. Fill the tank with water as directed:
4A. Model C
Pour three pitchers of tap water into the screened area on top of the brewer. Allow approximately two
minutes between pitchers for water to flow into the tank. While the third pitcher of water is entering the
tank, the tank will fill to capacity and the excess will flow from the sprayhead, out of the funnel, and into the
dispenser.
4B. Models CT, CTF, CWT, CWTA, CWTB, CWTF, CWTFA, CWTFB, SINGLE CW & SINGLE CWF
Connect the brewer to the power source, place the "ON/OFF" switch in the "ON" upper position, and momen-
tarily press and release the start switch. Water will begin flowing into the tank. When water stops flowing
into the tank, initiate a second and a third brew cycle. During the third brew cycle the tank will fill to its
capacity and the excess will flow from the sprayhead, out of the funnel, and into the dispenser.
5. When the flow 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 and initiate another brew cycle as directed:
6A. Model C
Pour one pitcher of tap water into the screened area on top of the brewer.
6B. Models CT, CTF, CWT, CWTA, CWTB, CWTF, CWTFA, CWTFB, SINGLE CW & SINGLE CWF
Place the "ON/OFF" switch in the "ON" upper position, and on models SINGLE CW and SINGLE CWF place
the batch selector switch in the "1 GAL" position. Momentarily press and release the start switch.
7. Place the "ON/OFF" switch in the lower “OFF” position after water has stopped flowing 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 flowing from the funnel.
It should be 64 ounces for all models except SINGLE CW and SINGLE CWF should be 128 ounces.
9. Models SINGLE CW and SINGLE CWF only, place the batch selector switch in the "1/2 GAL" position, and
momentarily press and release the start switch. Check the water volume in the dispenser after water has
stopped flowing from the funnel. It should be 64 ounces.
10. If water volumes are not correct, adjust the brew timer as required. See Adjusting Brew Volumes. Allow
the water to reheat, start, and measure another brew cycle.
11. Repeat step 10 until correct water volume is achieved.
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 filled, and a funnel and server are in place.
1. Modifying batch sizes. To modify a batch volume, first check that the SET/LOCK switch is in the “SET” posi-
Page 6
10841 020503
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 finish 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 finish in order to verify that the desired volume has been achieved.
OPERATING CONTROLS
Model C
ON/OFF SWITCH
Placing the "ON/OFF" switch in the "ON" upper position supplies power to the brew station warmer.
Models CT, CTF, CWT, CWTA, CWTB, CWTF, CWTFA, CWTFB, SINGLE CW & SINGLE CWF
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 flow of water into the funnel until the tank syphons down to its proper level. Placing the
switch in the "ON" upper position supplies power to the brew station warmer and enables the brew circuit.
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® filter into the funnel.
2. Pour the fresh coffee into the filter 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. Operate the brewer as directed:
5A. Model C
Pour one pitcher of tap water into the screened area on top of the brewer.
5B. Models CT, CTF, CWT, CWTA, CWTB, CWTF, CWTFA, CWTFB, SINGLE CW & SINGLE CWF
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 filter.
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 five 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
10841 020503
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 qualied 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 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 specied.
• Follow recommended service procedures
• Replace all protective shields or safety notices
PROBLEM
Brew cycle will not start (CT,
CTF, CWT, CWTA, CWTB, CWTF,
CWTFA, CWTFB, SINGLE CW &
SINGLE CWF)
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 black and
white terminals on two wire 120
volt brewers.
(A2) Check the terminal block
for 120 volts across the red and
white terminals and the black
and white terminals on three wire
120/240 volt brewers.
(A3) Check the terminal block for
200 volts on "B Series" brewers
or 230 volts on "A Series" brewers across the red and black
terminals.
Page 8
(B) Check circuit breakers or
fuses.
10841 020503
TROUBLESHOOTING (cont.)
PROBLEM
Brew cycle will not start (cont.) (CT,
CTF, CWT, CWTA, CWTB, CWTF,
CWTFA, CWTFB, SINGLE CW &
SINGLE CWF)
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 17
Refer to Service - Start Switch for
testing procedures. See page 20
Refer to Service - Timer for testing
procedures. See page 24
Refer to Service - Solenoid Valve
for testing procedures. See page
19
(A) Direction of flow arrow must
be pointing towards brewer.
(B) Remove the strainer/flow 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 BOM
replacement part #29329.1000
3. Control Thermostat
4. Tank Heater
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
Page 9
10841 020503
TROUBLESHOOTING (cont.)
PROBLEM
Inconsistent beverage level in
dispenser
PROBABLE CAUSE
1. Strainer/flow control (.222
GPM) (CT,CTF, CWT, CWTA,
CWTB, CWTF, CWTFA, CWTFB,
SINGLE CW & SINGLE CWF)
2. Syphon System
3. Lime Build-up
CAUTION - Tank and tank components 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 flow 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 (CT, CTF, CWT,
CWTA, CWTB, CWTF, CWTFA,
CWTFB, SINGLE CW & SINGLE
CWF)
Spitting or excessive steaming
4. Water Pressure (CT, CTF,
CWT, CWTA, CWTB, CWTF,
CWTFA, CWTFB, SINGLE CW &
SINGLE CWF)
1. Timer
2. Strainer/flow Control (.222
GPM)
1. Lime Build-up
CAUTION - Tank and tank components 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.
Page 10
The water pressure to the
brewer must be at least 20 psi
(138 kPa).
(Early models) Timer dial must
indicate at least two minutes and
fifteen seconds.
(A) Direction of flow arrow must
be pointing towards brewer.
(B) Remove the strainer/flow
control and check for obstructions. Clear or replace.
Inspect tank assembly for excessive lime deposits. Delime as
required.
10841 020503
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