Bunn Coffee Maker C, CT, CTF, CWT, CWTF Service Manual

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: [phone] FAX: [phone]

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

Page 2

10841 073108

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.

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 3

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.

10841 101008

CAUTION

POUR IN WATER ONLY

WARMERS AND SURFACES ARE HOT

#00831.0000

#00658.0000

#00656.0000

#02763.0000

#12364.0000

#37881.0000

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 Adminis-

tration (FDA). For models installed outside

the U.S.A., comply with the applicable

Plumbing /Sanitation Code.

Page 4

Model 15 has an attached cordset and requires 2-wire grounded service rated 120 volts ac, 15 amp,

single phase, 60 Hz.

Model 35 requires 3-wire,

grounded service rated 120/208

or 120/240 volts ac, 20 amp,

single phase, 60 Hz. Proceed as

follows:

Model 20 requires 2-wire,

grounded service rated 120 volts

ac, 20 amp, single phase, 60 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.

“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:

10841 101008

L2 RED

L1 BLACK

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 specied 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.

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.

Page 5

MODELS W/OUT 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.

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.

MODELS W/FAUCET

10841 101008

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.

Page 6

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 tem-

perature. 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-

10841 020503

Page 7

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.

10841 020503

Page 8

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 qualied service person-

nel.

• 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 specied.

• 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" brew-

ers across the red and black

terminals.

(B) Check circuit breakers or

fuses.

10841 020503

Page 9

TROUBLESHOOTING (cont.)

PROBLEM

Brew cycle will not start (cont.) (CT,

CTF, CWT, CWTA, CWTB, CWTF,

CWTFA, CWTFB, SINGLE CW &

SINGLE CWF)

Water is not hot

PROBABLE CAUSE

REMEDY

3. ON/OFF Switch

4. Start Switch

5. Timer

6. Solenoid Valve

7. Water strainer/flow control

(.222 GPM)

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 - 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 con-

trol and check for obstructions.

Clear or replace.

Refer to Service - Tank Heater

Switch for testing procedures.

See page 22

Refer to Service - Limit Thermo-

stat for testing procedures. See

page 16

Refer to Service - Control Ther-

mostat for testing procedures.

See page 15

Refer to Service - Tank Heater for

testing procedures. See page 21

10841 020503

Page 10

TROUBLESHOOTING (cont.)

PROBLEM

Inconsistent beverage level in

dispenser

Consistently low beverage level

in the dispenser (CT, CTF, CWT,

CWTA, CWTB, CWTF, CWTFA,

CWTFB, SINGLE CW & SINGLE

CWF)

Spitting or excessive steaming

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 com-

ponents should be delimed

regularly depending on local

water conditions. Excessive min-

eral build-up on stainless steel

surfaces can initiate corrosive

reactions resulting in serious

leaks.

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 com-

ponents should be delimed

regularly depending on local

water conditions. Excessive min-

eral 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 obstruc-

tion. 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.

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 obstruc-

tions. Clear or replace.

Inspect tank assembly for exces-

sive lime deposits. Delime as

required.

10841 020503