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

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CAUTION :
CAUTIO
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C, CT, CTF, CWT, CWTF, SINGLE CW,
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 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.
Page 4
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.
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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 quali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 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" 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
TROUBLESHOOTING (cont.)
PROBLEM
Spitting or excessive steaming (cont.)
Dripping from sprayhead
PROBABLE CAUSE
2. Control Thermostat
1. Syphon System
2. 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.
3. Solenoid Valve (CT, CTF, CWT, CWTA, CWTB, CWTF, CWTFA, CWTFB, SINGLE CW & SINGLE CWF)
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
Water flows into tank continu­ously (ON/OFF Switch "ON")
Water flows into tank continu­ously (ON/OFF Switch "OFF")
Beverage overflows dispenser
1. Timer (CT, CTF, CWT, CWTA, CWTB, CWTF, CWTFA, CWTFB, SINGLE CW & SINGLE CWF)
1. Solenoid Valve (CT, CTF, CWT, CWTA, CWTB, CWTF, CWTFA, CWTFB, SINGLE CW & SINGLE CWF)
1.Dispenser
2. Timer (CT, CTF, CWT, CWTA, CWTB, CWTF, CWTFA, CWTFB, SINGLE CW & SINGLE CWF)
3. Solenoid Valve (CT, CTF, CWT, CWTA, CWTB, CWTF, CWTFA, CWTFB, SINGLE CW & SINGLE CWF)
Refer to Service - Timer for test­ing procedures. See page 24
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
Remove the Solenoid Valve and clean any obstruction. Rebuild or replace the valve if necessary. See page 19
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10841 020503
TROUBLESHOOTING (cont.) PROBLEM
Weak beverage
PROBABLE CAUSE
1. Filter Type
2. Coffee Grind
3. Sprayhead
4. Funnel Loading
5. Water Temperature
REMEDY
BUNN® paper filters must be used for proper extraction.
A fine or drip grind must be used for proper extraction.
A clean spray-head must be used for proper extraction.
The BUNN® paper filter 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 (76°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 (CT, CTF, CWT, CWTA, CWTB, CWTF, CWTFA, CWTFB, SINGLE CW & SINGLE CWF)
1. Funnel Loading
1. Solenoid
2. Plumbing Lines
3. Water Supply
The BUNN® paper filter 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 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
10841 020503
TROUBLESHOOTING (cont.)
PROBLEM
Brewer is making unusal noises (cont.)(CT, CTF, CWT, CWTA, CWTB, CWTF, CWTFA, CWTFB, SINGLE CW & SINGLE CWF)
Brewer is making unusal noises (C)
Low beverage serving tempera­ture
Brewer does not change volume when half/full switch is changed.
PROBABLE CAUSE
4. Tank Heater
1. Tank Heater
1. Warmer
1. Selector switch
REMEDY
Remove and clean lime off the tank heater. See page 21
Remove and clean lime off the tank heater. See page 21
Refer to Service - Warmer ele­ment for testing procedures. See page 27
Refer to Service - Selector switch testing procedures. See page 20
Page 13
10841 020503
CAUTI ON :
W
A
R
M
E
R
S
A
N
D
S
U
R
F
A
C
E
S
A
R
E
H
O
T
CAUTION
!
BUNN
POUR IN W
ATER ONLY
CAUTION :
WARMERS AND SURFACES ARE HOT
CAUTION
!
BUNN
CAUTION :
WARMERS AND SURFACES ARE HOT
CAUTION
!
SERVICE
This section provides procedures for testing and replacing various major components used in this brewer should service become necessary. Refer to Troubleshooting for assistance in determining the cause of any problem.
WARNING - Inspection, testing, and repair of electri­cal equipment should be performed only by qualified service personnel. The brewer should be unplugged when servicing, except when electrical tests are re­quired and the test procedure specifically states to plug-in the brewer.
COMPONENT ACCESS
WARNING - Disconnect the brewer from the power
source before the removal of any panel or the replace­ment of any component.
All components are accessible by the removal of the top cover, front inspection panel and warmer plate(s).
The top cover is attached with one #4-40 screw.
The front inspection panel is attached with #6-32 screws.
MODEL C
The warmer assembly is attached with three #4-40
screws.
Contents
Control Thermostat ..............................................15
Limit Thermostat ..................................................16
ON/OFF Switch .....................................................17
Solenoid (Inlet) ....................................................19
Start Switch (Brew) ............................................. 20
Selector Switch ................................................... 20
Tank Heater ......................................................... 21
Tank Heater Switch .............................................22
Timer .................................................................. 24
Warmer Element ................................................. 27
Wiring Diagrams .................................... 28 thru 32
Page 14
MODEL SINGLE CW
FIG. 1 COMPONENT ACCESS
MODEL CWT
P1152
10841 020503
SERVICE (cont.)
CONTROL THERMOSTAT
MODEL C
3. Check the voltage across the blue wire on the control thermostat and the white insert on two pole 120 volt terminal block or three pole 120/240 volt terminal blocks and the red insert on two wire 200 volt or 240 volt terminal block with a voltmeter. Connect the brewer to the power source. The indication must be:
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models.
b) 200 to 230 volts ac for two wire 200 volt or
230 volt models.
4. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #5. If voltage is not present as described, refer to the wiring diagrams and check the brewer wiring harness.
5. Locate the black wire on the control thermo­stat.
6. Gently remove the capillary bulb and grommet from the tank.
7. Check the voltage across the black wire of the control thermostat and the white insert on the two pole 120 volt or three pole 120/240 volt terminal block and the red insert on the two pole 200 volt or 230 volt terminal block with a voltmeter when the control thermostat is turned fully clockwise. Connect the brewer to the power source. The indication must be:
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models.
b) 200 to 230 volts ac for two wire 200 volt or
230 volt models.
8. Disconnect the brewer from the power source.
MODEL CWT
MODEL SINGLE CW
P1153
FIG. 2 THERMOSTAT LOCATION
Location:
The control thermostat is located inside the trunk
on the left side of the component bracket.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Locate the blue wire on the control thermostat.
If voltage is present as described, reinstall the capil­lary tube into the tank to the line 4.5" (6.0" for Single CW models) above the bulb, the control thermostat is operating properly. If voltage is not present as described, replace the thermostat.
Removal and Replacement:
1. Remove wires from control thermostat leads.
2. Remove the thermostat capillary bulb by firmly
pulling-up on the capillary at the tank lid. This
will disengage the grommet from the tank lid.
3. Remove the one #8-32 screw securing the con­trol thermostat to the component bracket in the trunk.
Page 15
10841 071000
SERVICE (cont.)
CONTROL THERMOSTAT (cont.)
4. Slide the grommet to the line 4.5" above the bulb on the new capillary tube.
5. Insert the capillary bulb through the hole in the tank lid and press the grommet firmly and evenly so that the groove in the grommet fits into the tank lid.
6. Carefully bend the capillary tube so that the tube and bulb inside the tank are in the vertical posi­tion.
LIMIT THERMOSTAT
P1153
FIG. 4 LIMIT THERMOSTAT LOCATION
NOTE - The capillary tube must be clear of any electri-
cal termination and not kinked.
7. Early Models: Using two #8-32 screws secure the control thermostat inside the hood.
Late Models. Using one #8-32 screw secure the
control thermostat to the component bracket inside the trunk.
8. Refer to the illustration below when reconnecting the wires.
9. Adjust the control thermostat as required.
BLU to BLU Wire from Limit Thermostat
BLU to BLU Wire from Tank Heater (Brewers W/Out Faucet) BLK to Thermal Cut-Off from Tank Heater (Brewers with Faucet)
Early Models
Location: The limit thermostat is located inside the rear
of
the hood on the tank lid.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Disconnect the blue and black wires from the limit thermostat.
3. Check for continuity across the limit thermostat terminals with a ohmmeter.
If continuity is present as described, the limit thermostat is operating properly. If continuity is not present as described, replace the limit thermostat.
Removal and Replacement:
1. Remove all wires from limit thermostat termi­nals.
2. Carefully slide the limit thermostat out from under the retaining clip and remove limit thermostat.
3. Carefully slide the new limit thermostat into the retaining clip.
4. Refer to the illustration below when reconnecting the wires.
Late Models
FIG. 3 THERMOSTAT WIRING
P1129
Page 16
BLK to Tank Heater Switch
FIG. 5 LIMIT THERMOSTAT WIRING
BLU to BLU Lead from Control Thermostat
P1800
10841 071000
BUNN
C
W
S
ER
IES
READY
ON/LOW
ER
START
BUNN
C
W
SE
RIES
READY
ON/LOWER START
BUNN
C
W
SE
R
IES
READY
ON/LOW
ER START
BUNN
C
W
SE
R
IES
READY
ON/LOW
ER START
BUNN
CW
S
ER
IES
READY
ON/LOWER START
CAUTION
!
BUNN
LOWER
POUR IN WATER ONLY
CAUTION
!
BUNN
LOWER
POUR IN WATER ONLY
CAUTION
!
BUNN
POUR IN WATER ONLY
CAUTION
!
BUNN
POUR IN WATER ONLY
L
O
W
E
R
T
O
P
LOWER
FRONT-SIDE-REAR
TOP
LOWER
FRONT-SIDE-REAR
SERVICE (cont.)
ON/OFF SWITCH - MODEL C
ON/OFF SWITCH - MODEL CWT & SINGLE CW
ONE LOWER WARMER
ONE LOWER WARMER
ONE LOWER & ONE UPPER WARMER
THREE LOWER WARMERS (LEFT
OR RIGHT) OR ONE LOWER &
TWO UPPER WARMERS
ONE LOWER & ONE UPPER WARMER
THREE LOWER WARMERS OR ONE LOWER & TWO UPPER WARMERS
ONE UPPER & THREE LOWER WARMERS (LEFT OR RIGHT)
FIG. 6 ON/OFF SWITCH LOCATION
P1155
ONE UPPER & THREE LOWER WARMERS
FIG. 7 ON/OFF SWITCH LOCATION
Location:
The ON/OFF switch(s) are located on the front of
the hood.
Page 17
P1156
10841 020503
SERVICE (cont.)
ON/OFF SWITCH (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. Check the voltage across the white wire or red wire and the black wire with a voltmeter. Connect the brewer to the power source. The indication must be:
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models.
b) 200 to 230 volts ac for two wire 200 or 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.
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:
Lower Warmer ........................................................WHI/RED
One Top Warmer .............................................................. VIO
Two Top Warmers
(Front) ..................................................................... BRN/BLK
(Rear) ............................................................................... VIO
Two Top Warmers (1 Switch) ........................................... VIO
Side Warmers
(Front) ..................................................................... BRN/BLK
(Rear) ............................................................................... VIO
FIG. 8 ON/OFF SWITCH WIRING
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. Compress the clips inside the hood and gently push the switch through the opening.
3. Push the new switch into the opening and spread the clips to hold switch in the hood.
4. Refer to the following illustration when recon­necting the wires.
Page 18
10841 071000
SERVICE (cont.)
SOLENOID VALVE - CT, CWT & SINGLE CW
If continuity is not present as described, replace the solenoid valve.
6. Check the solenoid valve for coil action. Connect the brewer to the power source. With "ON/OFF" switch in the "ON' upper position press start switch and listen carefully in the vicinity of the solenoid valve for a" clicking" sound as the coil magnet attracts.
7. Disconnect the brewer from the power source.
If the sound is heard as described and water will not pass through the solenoid valve, there may be a block­age in the water line before the solenoid valve or, the solenoid valve may require inspection for wear, and removal of waterborne particles. If the sound is not heard as described, replace the solenoid valve.
P1153
FIG. 9 SOLENOID VALVE LOCATION
Location: The solenoid valve is located inside the trunk on the lower center part of the component bracket.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Disconnect the white/blue and white/green wires from the solenoid valve. With the "ON/OFF" switch in the "ON" upper position press the start switch.
3. Check the voltage across the white/blue and white/ green wires with a voltmeter. Connect brewer to power source. The indication must be:
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models.
b) 200 to 230 volts ac for two wire 200 or 230
volt models.
4. Disconnect brewer from the power source,
If voltage is present as described, proceed to #5 If voltage is not present as described, refer to Wiring Diagrams and check brewer wiring harness.
Removal and Replacement:
1. Remove the white/blue and white/green from the solenoid valve.
2. Turn-off the water supply to the brewer.
3. Disconnect the water lines to and from the sole­noid valve.
4. Remove the two #8-32 screws securing the solenoid mounting bracket to the component bracket. Remove solenoid bracket and solenoid valve as an assembly.
5. Remove the two #10-32 screws and lockwash­ers securing the solenoid valve to the solenoid bracket.
6. Using two #10-32 screws and lockwashers in­stall new solenoid valve on solenoid mounting bracket.
7. Using two #8-32 screws install solenoid valve and bracket to the component bracket.
8. Securely fasten the water lines to and from the solenoid valve.
9. Refer to the illustration below when reconnecting the wires.
WHI/BLU from Timer
WHI/GRN from Timer
5. Check for continuity across the solenoid valve coil terminals.
If continuity is present as described, reconnect the white/blue and white/green wire from the timer.
Page 19
FIG. 10 SOLENOID VALVE WIRING
P1132
10841 020503
SERVICE (cont.)
SELECTOR SWITCH - SINGLE CW only
P1153
FIG. 11 BATCH SELECTOR SWITCH LOCATION
Location: The batch selector switch is located on the front of the hood to the right of the start switch.
Test Procedure:
1. Disconnect the brewer from the power supply.
2. Disconnect the pink and tan wires from the switch terminals.
3. Check for continuity across the two terminals on the switch when it is in the both positions. Continuity must be present across these terminals only in the full position.
If continuity is not present as described, replace the switch.
Removal and Replacement:
1. Remove the pink and tan wires from the switch.
2. Compress the clips inside the hood and gently push the switch through the opening.
3. Push new switch into the opening and spread the clips to hold the switch in the hood.
4. Refer to the following illustration when recon­necting the wires.
START SWITCH - CT, CWT & SINGLE CW
P1153
FIG. 13 START SELECTOR SWITCH LOCATION
Location: The start switch is located in the center front of the hood.
Test Procedure:
1. Disconnect the brewer from the power supply.
2. Disconnect the blue wire from the top switch terminal and the white/red from the bottom switch terminal.
3. Check for continuity across the two terminals on the switch when it is held in the lower position. Continuity must not be present across these terminals in the upper position.
If continuity is present as described, reconnect the blue wire to the top terminal and the white/red to the bottom terminal. If continuity is not present as described, replace the switch.
Removal and Replacement:
1. Remove the blue wire and white/red from the start switch.
2. Compress the clips inside the hood and gently push the switch through the opening.
3. Push new switch into the opening and spread the clips to hold the start switch in the hood.
4. Refer to the following illustration when recon­necting the wires.
PNK from timer
TAN from timer
P1918
FIG. 12 BATCH SELECTOR SWITCH WIRING
Page 20
BLU to BLU Lead from Timer P1
WHI/RED to ON/OFF Switch
P1133
FIG. 14 START SELECTOR SWITCH WIRING
10841 020503
SERVICE (cont.)
TANK HEATER
P1153
FIG. 15 TANK HEATER LOCATION
Location: The tank heater is located inside the tank and secured to the tank lid.
Test Procedures:
1. Disconnect the brewer from the power supply.
2. Check the voltage across the black and white wires on 120 volt models or the black and red wires for 120/240 volt models, 200 volt models and 230 volt models with a voltmeter. Connect the brew to the power source. The indication must be:
a) 120 volts ac for two wire 120 volt 15 and 20
amp models.
b) 240 volts ac for three wire 120/240 volt mod-
els.
c) 200 to 230 volts ac for two wire 200 or 230
volt models.
3. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #4 If voltage is not present as described, refer to the Wiring Diagrams and check wiring harness.
4. Disconnect the black wire and the white or red wire from the tank heater terminals.
5. Check for continuity across the tank heater ter­minals.
If continuity is present as described, reconnect the wires, the tank heater is operating properly. If continuity is not present as described, replace the tank heater.
NOTE- If the tank heater remains unable to heat, remove and inspect heater for cracks in the sheath.
Removal and Replacement:
1. Disconnect the water supply tube from the fill basin.
2. Remove the tank inlet fitting securing the fill basin to the tank lid, remove fill basin and tank inlet gasket. Set all three parts aside for reas­sembly.
3. On brewers with faucet shut-off water supply to the brewer and disconnect the inlet and outlet water lines to the faucet coil assembly.
4. Disconnect the black wire on the limit thermostat from the tank heater switch. On late model brew­ers also disconnect the blue wire from the limit thermostat to the control thermostat.
5. Disconnect the black wire and the white or red wire from the tank heater terminals.
6. Remove sprayhead and the hex nut securing the sprayhead tube to the hood. Set aside for reassembly.
7. Remove the eight #8-32 nuts securing the tank lid to the tank.
8. Remove the tank lid with limit thermostat, spray­head tube, tank heater, coil assembly and control thermostat w/bracket (early models only).
9 Remove the two hex nuts securing the tank heater
to the tank lid. Remove tank heater with gaskets and discard.
10. Install new tank heater with gaskets on the tank lid and secure with two hex nuts.
11. Install tank lid with limit thermostat, sprayhead tube, tank heater, coil assembly (brewers with faucet) and control thermostat with bracket (early brewers only) using eight #8-32 hex nut.
12. Reconnect the inlet and outlet water lines to the faucet coil assembly.
13. Secure sprayhead tube to hood using a hex nut.
Page 21
10841 020503
SERVICE (cont.) TANK HEATER (Cont.)
14. Install sprayhead.
15. Reconnect the wires to the limit thermostat, tank heater and control thermostat. See limit thermostat and control thermostat sections in this manual when reconnecting wires.
16. Install fill basin, secure with tank inlet fitting and gasket. Insert water supply line through grommet in fill basin.
17. Refer to the illustration below when reconnecting the tank heater wires.
WHI to Terminal Block (White Insert on 120V Two Wire Models) RED to Terminal Block (Red Insert on 120/240V Threee wire Models or 200V and 230V Two Wire Models)
BLK to Control Ther­mostat (Brewers W/Out Faucet) Thermal Cut-Off to BLK from Control Thermostat (Brewers W/Faucet
TANK HEATER SWITCH
P1153
FIG. 17 TANK HEATER SWITCH LOCATION
FIG. 16 TANK HEATER WIRING
P1168
Location: The tank heater switch is located on the rear of the brewer on the upper left side of the trunk.
Test Procedure:
1. Disconnect the brewer from the power source.
2. Disconnect the black wire from the limit thermo­stat.
3. With the tank heater switch in the "ON" position check the voltage between the black wire removed from the limit thermostat and the white wire or red wire on the tank heater with a voltmeter. Connect the brewer to the power source. The indication must be:
a) 120V volts ac on two wire 120 volt models. b) 240 volts ac on three wire 120/240 volt mod-
els.
c) 200 to 230 volts ac on 200 volt or 230 volt
models.
4. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #5. If voltage is not present as described, refer to the Wiring Diagrams and check the brewer wiring harness.
Page 22
10841 020503
SERVICE (cont.) TANK HEATER SWITCH (cont.)
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 fill tube from back of fill basin.
3. Remove the tank inlet fitting securing fill basin the tank lid. Remove fill 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. (BUNN-O-MATIC has #12440 syphon assembly available for this purpose.
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 to 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 fill basin, inlet gasket and secure to tank lid with tank inlet fitting.
22. Carefully install water fill tube into the back of the fill basin.
23. Reconnect and turn on the incoming water sup­ply.
24. Refer to the illustration below when reconnecting the wires.
BLK to Limit Thermostat
BLK to Terminal Block (Black Insert)
P1135
FIG. 18 TANK HEATER SWITCH WIRING
Page 23
10841 020503
SERVICE (cont.)
DIAL TIMER (Early Models) - CT & CWT
Dial Timer
P1153
FIG. 19 TIMER LOCATION
Location: The timer is located inside the front of the trunk on the upper right side of component bracket.
Test Procedure (Dial Timer).
1. Disconnect the brewer from the power source.
2. Disconnect the polarized, three pin connector from the brewer wiring harness and rotate the brew timer dial fully counterclockwise.
3. Check the voltage across sockets P2 & P3 (white and black wires) of the female connector with a voltmeter when the "ON/OFF" is in the "ON" posi­tion (upper). Connect the brewer to the power source. The indication must be:
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models.
b) 200 to 230 volts ac on two wire 200 volt or
230 volt models.
4. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #5. If voltage is not present as described, refer to the Wiring Diagrams and check the brewer wiring har­ness.
with a voltmeter when the "ON/OFF" switch is in the
"ON" position (upper) and start switch pressed. Connect the brewer to the power source. The indication must be:
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models.
b) 200 to 230 volts ac for two wire 200 volt or
230 volt models.
6. Disconnect the brewer from the power source.
7. Reconnect the three pin connector from main wiring harness to the timer.
If voltage is present as described, proceed to #7 If voltage is not present as described, refer to Wiring Diagrams and check the brewer wiring harness.
7. Disconnect the black and white wires from the solenoid.
8. Check the voltage across the black and white wires with a voltmeter when the "ON/OFF" switch is in the "ON" position (upper) and the "START" switch is pressed to the "START" position (lower) and released. Connect the brewer to the power source. The indication must be:
a) 120 volts ac for approximately 20 seconds for
two wire 120 volt models and three wire 120/240 volt models.
b) 200 to 230 volts ac for approximately 20 sec-
onds for two wire 200 volt or 230 volt models.
If voltage is present as described, the brew timer is operating properly. Reset the timer dial as required, to obtain the desired brew volume. If voltage is not present as described, replace the timer.
Removal and Replacement (Dial Timer):
1. Disconnect the timer socket from the brewer wir­ing harness and the timer leads from the solenoid valve.
2. Remove the one #8-32 screw securing timer to component bracket.
3 Install new timer on component bracket securing
with one #8-32 screw.
4. Refer to the following illustration when recon­necting the wires.
5. Readjust the timer dial as required.
5. Check the voltage across the sockets P1 & P2 (blue and white wires) of the female connector
Page 24
10841 020503
SERVICE (cont.) DIAL TIMER (Early Models) (cont.)
To Main Wiring Harness
WHI to Solenoid Valve
2. Remove the #8-32 screw securing circuit board to the mounting bracket.
3. Remove circuit board and spacers (as required).
4. With a voltmeter, check the voltage across terminals TL1 and TL2 when the "ON/OFF" switch is in the "ON" position. Connect the brewer to the power source. The indication must be:
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models.
b) 200 to 230 volts ac on two wire 200 volt or
230 volt models.
5. Disconnect the brewer from the power source.
BLK to Solenoid Valve
Dial Timer
FIG. 20 TIMER WIRING
DIGITAL BREW TIMER (Late Models)
P1136
If voltage is present as described, proceed to #6. If voltage is not present as described, refer to the Wiring Diagrams and check the brewer wiring harness.
6. With a voltmeter, check the voltage across terminals TL1 and TL4 when the "ON/OFF" switch is in the "ON" position. Connect the brewer to the power source. The indication must be 0 volts.
If voltage is as described, proceed to #7. If voltage is not as described, disconnect the brewer from the power source and replace the timer.
7. With a voltmeter, check the voltage across ter­minals TL1 and TL4 when the "ON/OFF" switch is in the "ON" position. Connect the brewer to the power source and press the "START" switch. The indication must be as follows:
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models.
b) 200 to 230 volts ac on two wire 200 volt or
230 volt models.
FIG. 21 DIGITAL BREW TIMER
P2203.45
Location: The timer is located inside the front of the trunk on the upper right side of component bracket.
Test Procedure (Digital Timer): NOTE: Do not remove or install wires while timer board is installed. Pressure applied to one side may cause damage to the board.
1. Disconnect the brewer from the power source and remove the front access panel.
If voltage is present as described, the brew timer is operating properly. Reset the timer as required, to obtain the desired brew volume. If voltage is not present as described, disconnect the brewer from the power source and replace the timer.
Removal and Replacement (Digital Timer):
1. Remove the #8-32 screw securing circuit board to the mounting bracket.
2. Remove circuit board and spacers (as required).
3. Remove all wires from the timer.
Page 25
10841 020503
SERVICE (cont.) DIGITAL BREW TIMER (Late Models)(cont.)
4. Attach all wires to the replacement timer board prior to installation to the component mounting bracket. Refer to FIG. 22 when reconnecting the wires.
5. Install new circuit board with spacers (as required) to the component mounting bracket.
6. Adjust the timer as described below.
Timer Setting (Digital): NOTE: Prior to setting or modifying volumes, check that the brewer is connected to water supply, the tank is properly filled, and a funnel and server are in place. NOTE: All volume settings must be done with the sprayhead installed.
1. Modifying brew volumes. To modify a brew vol-
ume, first 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 finish in order to verify that the desired volume has been achieved.
selector switch in the half 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 approximately 50 ounces is reached, turn the ON/OFF switch to “OFF”. NOTE: Several ounces of water will continue to sy­phon 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 be­comes 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.
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 finish in order to verify that the desired volume has been achieved.
2. Setting brew volumes. To set a brew volume,
first check that the SET/LOCK switch is in the “SET” position on the circuit board. Place the ON/OFF switch in the “ON” position. Models Single CW only, place the
Page 26
BLU/BLK wire from TL5 to P1 WHI/GRN wire from TL4 to Solenoid WHI/BLU wire from TL3 to Solenoid WHI wire from TL2 to P2 BLK wire from TL1 to P3
FIG. 22 DIGITAL TIMER WIRING
P2037
10841 020503
SERVICE (cont.) WARMER ELEMENT(S)
If continuity is present as described, reconnect the white or red and white/red, and brown/black or violet wires on the warmer element. If continuity is not present as described, replace the warmer element.
Removal and Replacement:
1. Remove the three #4-40 screws securing the warmer assembly to the brewer.
2. Lift the warmer assembly from the brewer.
3. Disconnect the two wires from the warmer element terminals.
4. Remove the two #8-32 nuts securing the warmer element to the warmer plate.
5. Securely install new warmer element.
6. Reconnect the two wires to warmer element ter­minals.
7. Securely install warmer assembly on the brewer.
8. Refer to the illustration below when reconnecting the wires.
FIG. 23 WARMER LOCATION
P1158
Location:
The warmer element(s) is located under the warmer
plate.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Use the white or red wire to the terminal block and the white/red, brown/black or violet wire to the "ON/OFF" switch.
3. Check voltage across the white or red and white/ red, brown/black or violet with a voltmeter with the "ON/OFF" switch in the "ON" position. The indication must be:
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models.
b) 200 to 230 volts ac for two wire 200 or 230 volt
models.
4. Disconnect the brewer from the power source.
WHI/RED to ON/OFF Switch (One Lower Warmer) BRN/BLK to ON/OFF Switch (Top Front Warmer or Side Warmer) VIO to ON/OFF Switch (Top Front Warmer or Rear Side Warmer)
WHI to Terminal Block (120V or 120/240V Brewers) WHI to Terminal Block (200V or 230V Brewers)
P1159
FIG. 24 WARMER WIRING
If voltage is present as described, proceed to #5. If voltage is not present as described, refer to wiring diagrams and check brewer wiring harness.
5. Check the continuity across the two terminals on
the warmer element.
Page 27
10841 071000
P3
BLK
P1, P2, & P3 ARE PINS OF A
POLARIZED THREE-PIN
CONNECTOR.
BLU
BLU/BLK
WHI
BREW TIMER
P1
P2
WHI
OPTIONAL AUTOMATIC BREW CIRCUIT
SCHEMATIC WIRING DIAGRAM C, CT & CWT
P2
P1
FRONT
WHI
WHI
P3
WHI
BRN/BLK
VIO
WHI
REAR
WHI
WHIBLK
WHI/RED
LOWER WARMER
START SWITCH
WHI/RED
WHI/RED
L1
GRN
BLK
RED (MODEL 35)
WHI (MODELS 15 & 20)
N L2
HEATER SWITCH
BLK
BLU
ON/OFF
SWITCH
WHI/RED
WHI
REAR
WHI
WHI
P3
P1
VIO
(FAUCET
OPTION ONLY)
THERMAL
FUSE
BLKBLK
LIMIT
THERMOSTAT
120/240 VOLTS AC 3 WIRE
120 VOLTS AC 2 WIRE
SINGLE PHASE
BLK
BRN/BLK
BLK
VIO
OPTIONAL DUAL WARMER ASSY (TOP OR SIDE)
BLK
OPTIONAL SINGLE TOP WARMER ASSY
VIO WHI
WHI
OPTIONAL FRESH LIGHT SYSTEM
WHI
WHI/ORA
READY
BLK
BLU
SW. & THERMOSTAT
TANK HEATER
"KEEP WARM" HEATER
GRY
L.E.D.
PNK
INDICATOR
TIMER
4 3 2 1
SOL
T1 T5 T3
T4 T2
WHI/BLU
WHI/GRN
1
3
2
1
3
2
1
3
2
1
3
2
Page 28
10841 071000
P3
P1, P2, & P3 ARE PINS OF A
POLARIZED THREE-PIN
CONNECTOR.
BLU
P1
RED
OPTIONAL AUTOMATIC BREW CIRCUIT
SCHEMATIC WIRING DIAGRAM CWTB
P2
P1
FRONT
RED
RED
P3
RED
BRN/BLK
VIO
RED
REAR
RED
RED
REDBLK
WHI/RED
LOWER WARMER
START SWITCH
WHI/RED
WHI/RED
L1
GRN/YEL
BLK
L2
HEATER SWITCH
BLK
BLU
ON/OFF SWITCH
WHI/RED
REAR
RED
RED
P3
P1
VIO
(FAUCET
OPTION ONLY)
THERMAL
FUSE
BLKBLK
LIMIT
THERMOSTAT
200 VOLTS AC 2 WIRE
SINGLE PHASE
BLK
BRN/BLK
BLK
VIO
OPTIONAL DUAL WARMER ASSY (TOP OR SIDE)
BLK
OPTIONAL SINGLE TOP WARMER ASSY
VIO RED
READY
BLK
BLU
SW. & THERMOSTAT
TANK HEATER
BLK
BLU/BLK
WHI
BREW TIMER
P2
SOL
T1 T5 T3
T4 T2
WHI/BLU
WHI/GRN
1
3
2
1
3
2
1
3
2
1
3
2
Page 29
10841 071000
P3
P1, P2, & P3 ARE PINS OF A
POLARIZED THREE-PIN
CONNECTOR.
BLU
P1
RED
OPTIONAL AUTOMATIC BREW CIRCUIT
SCHEMATIC WIRING DIAGRAM CWTA
P2
P1
FRONT
RED
RED
P3
RED
BRN/BLK
VIO
RED
REAR
RED
WHI
RED
REDBLK
WHI/RED
LOWER WARMER
START SWITCH
WHI/RED
WHI/RED
L1
GRN/YEL
BLK
L2
HEATER SWITCH
BLK
BLU
ON/OFF
SWITCH
WHI/RED
WHI
REAR
RED
RED
P3
P1
VIO
(FAUCET
OPTION ONLY)
THERMAL
FUSE
BLKBLK
LIMIT
THERMOSTAT
220-240 VOLTS AC
2 WIRE
SINGLE PHASE
BLK
BRN/BLK
BLK
VIO
OPTIONAL DUAL WARMER ASSY (TOP OR SIDE)
BLK
OPTIONAL SINGLE TOP WARMER ASSY
VIO RED
READY
BLK
BLU
SW. & THERMOSTAT
TANK HEATER
"KEEP WARM"
BLK
BLU/BLK
WHI
BREW TIMER
P2
SOL
T1 T5 T3
T4 T2
WHI/BLU
WHI/GRN
1
3
2
1
3
2
1
3
2
1
3
2
Page 30
10841 071000
P3
BLK
P1, P2, & P3 ARE PINS OF A
POLARIZED THREE-PIN
CONNECTOR.
WHI
BLK
SOL
BLU BLU
WHI
BREW TIMER
P1
P2
WHI
OPTIONAL AUTOMATIC BREW CIRCUIT
SCHEMATICWIRINGDIAGRAM
CWTF, CWTFB NO WARMER
WHI
BLK
START SWITCH
WHI/RED
WHI/RED
TANK HEATER
L1
GRN
BLK
RED (MODEL 35)
WHI (MODELS 15 & 20)
N
L2
HEATER SWITCH
BLK
BLU
READY INDICATOR
BLU
SW. & THERMOSTAT
ON/OFF
SWITCH
WHI/RED
"KEEP WARM" HEATER
WHI
(FAUCET
OPTION ONLY)
THERMAL
FUSE
BLKBLK
LIMIT
THERMOSTAT
120/240 VOLTS AC 3 WIRE 100-120 VOLTS AC 2 WIRE
SINGLE PHASE
BLK
WHI
OPTIONAL FRESH LIGHT SYSTEM
BLK
4 3
2 1
PNK
GRY
L.E.D.
INDICATOR
TIMER
WHI
WHI/ORA
Page 31
10841 042401
READY INDICATOR
BLK
BLU
SW. & THERMOSTAT
P3
BLK
P1, P2, & P3 ARE PINS OF A
POLARIZED THREE-PIN
CONNECTOR.
WHI
BLK
SOL
BLU BLU
WHI
BREW TIMER
P1
P2
WHI
OPTIONAL AUTOMATIC BREW CIRCUIT
SCHEMATICWIRINGDIAGRAM
CWTFA NO WARMER
RED
BLK
WHI/RED
WHI/RED
TANK HEATER
L1
GRN
BLK
RED
L2
HEATER SWITCH
BLK
BLK
BLU
ON/OFF
SWITCH
WHI/RED
"KEEP WARM" HEATER
WHI
THERMAL
FUSE
THERMAL
FUSE
BLKBLK
LIMIT
THERMOSTAT
230 VOLTS AC
2 WIRE
SINGLE PHASE
WHI
OPTIONAL FRESH LIGHT SYSTEM
BLK
4 3
2 1
PNK
GRY
L.E.D.
INDICATOR
TIMER
WHI
WHI/ORA
START SWITCH
RED
RED
BLU
WHI
BREW TIMER
SCHEMATIC WIRING DIAGRAM
SINGLE CW
WHI
WHI
WHI
WHIBLK
WHI/RED
LOWER WARMER
START SWITCH
WHI/RED
WHI/RED
L1
GRN
BLK
RED (MODEL 35)
WHI (MODELS 15 & 20)
N L2
HEATER SWITCH
BLK
BLU
ON/OFF
SWITCH
WHI/RED
WHI
WHI
(FAUCET
OPTION ONLY)
THERMAL
FUSE
BLKBLK
LIMIT
THERMOSTAT
120/240 VOLTS AC 3 WIRE
120 VOLTS AC 2 WIRE
SINGLE PHASE
BLK
BRN/BLK
VIO
TAN
PNK
BLK
WHI
READY
BLK
BLK
SW. & THERMOSTAT
TANK HEATER
"KEEP WARM" HEATER
SOL
T1 T5 T3
T4 T2
WHI/BLU
WHI/GRN
1
3
2
P1
P3
P2
1
3
2
1
3
2
HALF/FULL
SWITCH
NO CONNECTION THIS APPLICATION
P1, P2, &
P3 ARE
PINS OF A POLARIZED THREE-PIN
CONNECTOR.
Page 32
10841 020503
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