Bunn CS, CT, CWTF, CRT, CRTF User Manual
C, CT, CTF,
CWT, CWTF
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
www.bunnomatic.com
WARRANTY
Bunn-O-Matic Corp. (“Bunn”) warrants the equipment manufactured by it to be commercially free from defects
in material and workmanship existing at the time of manufacture and appearing within one year from the date of
installation. In addition:
1.) Bunn warrants electronic circuit and/or control boards to be commercially free from defects in material and
workmanship for three years from the date of installation.
2.) Bunn warrants the compressor on refrigeration equipment to be commercially free from defects in material
and workmanship for two years from the date of installation.
3.) Bunn warrants that the grinding burrs on coffee grinding equipment will grind coffee to meet original factory
screen sieve analysis for three years from date of installation or for 30,000 pounds of coffee, whichever comes first.
This warranty does not apply to any equipment, component or part that was not manufactured by Bunn or that,
in Bunn’s judgement, has been affected by misuse, neglect, alteration, improper installation or operation, improper
maintenance or repair, damage or casualty.
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.
The Buyer shall give 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. If requested by Bunn, the Buyer
shall ship the defective equipment prepaid to an authorized Bunn service location. If Bunn determines, in its sole
discretion, that the equipment does not conform to the warranty, Bunn shall repair the equipment with no charge
for parts during the warranty period and no charge for labor by a Bunn Authorized Service Representative during
the warranty period. If Bunn determines that repair is not feasible, Bunn shall, at its sole option, 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, AS
SPECIFIED HEREIN, TO REPAIR OR, AT BUNN’S SOLE OPTION, 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.
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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.
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ELECTRICAL REQUIREMENTS
CAUTION - The brewer must be disconnected from the power source until specified in
Model 15 has an attached cordset and requires 2-wire grounded service rated 120 volts ac, 15 amp, single
phase, 60 Hz.
Initial Set-Up.
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.
PLUMBING REQUIREMENTS
Model C:
This model is completely portable and requires no attached plumbing.
Models CT, CTF, CWT, CWTA, CWTB, CWTF, CWTFA & CWTFB
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 Basic Plumbing Code of the
Building Officials and Code Administrators International, Inc. (BOCA)
and the Food Service Sanitation Manual of the Food and Drug Administration (FDA).
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10841 071000
PLUMBING REQUIREMENTS (cont.)
MODELS W/OUT FAUCET
MODELS W/FAUCET
Models CT, CWT, CTF & CWTF
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 and CWTF Models, place an empty vessel beneath the faucet and lift the handle until water is
dispensed.
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10841 071000
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
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 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
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 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.
9. If not, adjust the brew timer as required. See
measure another brew cycle.
10. Repeat step 9 until 64 oz water volume is achieved.
11. The brewer is now ready for use in accordance with the coffee brewing instructions on the next page.
Adjusting Brew Volumes
. Allow the water to reheat, start, and
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”
position 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
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10841 071000
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
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
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.
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TROUBLESHOOTING
A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems
encountered. If the problem remains after exhausting the troubleshooting steps, contact the Bunn-O-Matic
Technical Service Department.
• Inspection, testing, and repair of electrical equipment should be performed only by qualified 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 fittings 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 specified.
• 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)
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.
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(B) Check circuit breakers or
fuses.
10841 071000
TROUBLESHOOTING (cont.)
PROBLEM
Brew cycle will not start (cont.)
(CT, CTF, CWT, CWTA, CWTB,
CWTF, CWTFA & CWTFB)
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 23
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 20
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TROUBLESHOOTING (cont.)
PROBLEM
Inconsistent beverage level in
dispenser
PROBABLE CAUSE
1. Strainer/flow control (.222
GPM) (CT,CTF, CWT, CWTA,
CWTB, CWTF, CWTFA &
CWTFB)
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)
Spitting or excessive steaming
4. Water Pressure (CT, CTF,
CWT, CWTA, CWTB, CWTF,
CWTFA & CWTFB)
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.
The water pressure to the
brewer must be at least 20 psi
(138 kPa).
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.
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