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ITB/ITCB/HV
ICB/TWIN
Infusion Series
®
SERVICE & REPAIR MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
42461.0000B 08/11 ©2010 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 specifi ed below: 2 years parts and 1 year labor.
2) Electronic circuit and/or control boards: parts and labor for 3 years.
3) Compressors on refrigeration equipment: 5 years parts and 1 year labor.
4) Grinding burrs on coffee grinding equipment to grind coffee to meet original factory screen sieve analysis: parts and labor for 3 years or 30,000 pounds of coffee, whichever comes fi rst.
These warranty periods run from the date of installation BUNN warrants that the equipment manufactured by it will be commercially free of defects in material and workmanship existing at the time of manufacture and appearing within the applicable warranty period. This warranty does not apply to any equipment, component or part that was not manufactured by BUNN or that, in BUNN’s judgment, has been affected by misuse, neglect, alteration, improper installation or operation, improper maintenance or repair, damage or casualty. This warranty is conditioned on the Buyer 1) giving BUNN prompt notice of any claim to be made under this warranty by telephone at (217) 529-6601 or by writing to Post Offi ce Box 3227, Springfi eld, Illinois 62708-3227; 2) if requested by
BUNN, shipping the defective equipment prepaid to an authorized BUNN service location; and 3) receiving prior authorization from BUNN that the defective equipment is under warranty.
THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARRANTY, WRITTEN OR
ORAL, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF EITHER
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. The agents, dealers or employees of BUNN are not authorized to make modifi cations to this warranty or to make additional warranties that are binding on
BUNN. Accordingly, statements by such individuals, whether oral or written, do not constitute warranties and should not be relied upon.
If BUNN determines in its sole discretion that the equipment does not conform to the warranty, BUNN, at its exclusive option while the equipment is under warranty, shall either 1) provide at no charge replacement parts and/or labor (during the applicable parts and labor warranty periods specifi ed above) to repair the defective components, provided that this repair is done by a BUNN Authorized Service Representative; or 2) shall replace the equipment or refund the purchase price for the equipment.
THE BUYER’S REMEDY AGAINST BUNN FOR THE BREACH OF ANY OBLIGATION ARISING OUT OF THE SALE OF
THIS EQUIPMENT, WHETHER DERIVED FROM WARRANTY OR OTHERWISE, SHALL BE LIMITED, AT BUNN’S
SOLE OPTION AS SPECIFIED HEREIN, TO REPAIR, REPLACEMENT OR REFUND.
In no event shall BUNN be liable for any other damage or loss, including, but not limited to, lost profi ts, lost sales, loss of use of equipment, claims of Buyer’s customers, cost of capital, cost of down time, cost of substitute equipment, facilities or services, or any other special, incidental or consequential damages.
392, AutoPOD, AXIOM, BrewLOGIC, BrewMETER, Brew Better Not Bitter, BrewWISE, BrewWIZARD, BUNN
Espress, BUNN Family Gourmet, BUNN Gourmet, BUNN Pour-O-Matic, BUNN, BUNN with the stylized red line,
BUNNlink, Bunn-OMatic, Bunn-O-Matic, BUNNserve, BUNNSERVE with the stylized wrench design, Cool Froth,
DBC, Dr. Brew stylized Dr. design, Dual, Easy Pour, EasyClear, EasyGard, FlavorGard, Gourmet Ice, Gourmet
Juice, High Intensity, iMIX, Infusion Series, Intellisteam, My Café, PowerLogic, Quality Beverage Equipment
Worldwide, Respect Earth, Respect Earth with the stylized leaf and coffee cherry design, Safety-Fresh, savemycoffee.com, Scale-Pro, Silver Series, Single, Smart Funnel, Smart Hopper, SmartWAVE, Soft Heat, SplashGard,
The Mark of Quality in Beverage Equipment Worldwide, ThermoFresh, Titan, A Partner You Can Count On, Air
Brew, Air Infusion, Beverage Bar Creator, Beverage Profi t Calculator, Brew better, not bitter., BUNNSource, Coffee At Its Best, Cyclonic Heating System, Digital Brewer Control, Nothing Brews Like a BUNN, Pouring Profi ts,
Signature Series, Tea At Its Best, Phase Brew, The Horizontal Red Line, trifecta, Ultra, Velocity Brew are either trademarks or registered trademarks of Bunn-O-Matic Corporation.
2
42461 050511
INTRODUCTION
This equipment will brew a half-gallon batch of coffee into an awaiting dispenser. It can be easily confi gured for 120V 15 amp, 120/208V 20 amp or 120/240V 20 amp. The brewer may have a hot water faucet for allied beverage use. It is only for indoor use on a sturdy counter or shelf.
CONTENTS
Warranty .............................................................................................................2
Contents ..............................................................................................................3
Troubleshooting ..................................................................................................4
Diagnostic Displays .............................................................................................9
Access ..............................................................................................................10
Control Board ....................................................................................................11
Membrane Switch .............................................................................................12
Brew Valves (Early) ...........................................................................................13
Brew Valves (Current) .......................................................................................14
Refi ll Valves ......................................................................................................15
Tank Heaters .....................................................................................................17
Limit Thermostat ...............................................................................................18
Temperature Probe............................................................................................19
DV Selector Switch ...........................................................................................21
On/Off Switch ....................................................................................................22
Schematic Wiring Diagrams ..............................................................................23
3
42461 081310
TROUBLESHOOTING
A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems encountered. If the problem remains after exhausting the troubleshooting steps, contact the Bunn-O-Matic
Technical Service Department.
• Inspection, testing, and repair of electrical equipment should be performed only by qualifi ed service personnel.
• All electronic components have ac line voltage and some have low voltage dc potential on their terminals.
Shorting of terminals or the application of external voltages may result in board failure.
• Intermittent operation of electronic circuit boards is unlikely. Board failure will normally be permanent. If an intermittent condition is encountered, the cause will likely be a switch contact or a loose connection at a terminal or crimp.
• Solenoid removal requires interrupting the water supply to the valve. Damage may result if solenoids are energized for more than ten minutes without a supply of water.
• The use of two wrenches is recommended whenever plumbing fi ttings are tightened or loosened. This will help to avoid twists and kinks in the tubing.
• Make certain that all plumbing connections are sealed and electrical connections tight and isolated.
• This brewer is heated at all times. Keep away from combustibles.
•
•
WARNING
• Exercise extreme caution when servicing electrical equipment.
•
Unplug the brewer when servicing, except when electrical tests are specifi ed.
Follow recommended service procedures.
Replace all protective shields or safety notices.
Before troubleshooting this brewer, check for the following:
Control Boards
1. Make sure ribbon cable is properly attached to the control board (ALL PINS INSERTED INTO PLUG).
2. Make sure there is a nylon insulating washer under each screw head that holds the control board to the plastic front end cap. This is important for proper operation.
3. Make sure before servicing brewer that voltage is present at control board.
4. Press any warmer switch or observe if any indicator lights are glowing on the control panel. If so, proceed with testing. If not, check for voltage across pins 1 & 2 of the ten pin J1 connector (black and white wires).
If voltage is present, replace the control board. If voltage is not present, check wiring and voltage across terminal block (black and white). Correct the problem and retest before proceeding with testing.
NOTE: In the event of board replacement, technician will need to re-program customer's settings and/or recipes,
as well as re-calibrate the temperature probe in program level 3 and re-enter the serial number in level 4.
4
42461 081310
TROUBLESHOOTING (cont.)
REFILL CIRCUIT
PROBLEM
Will not refi ll
PROBABLE CAUSE
1. Power off to brewer
2. Water shut off
3. Error Message
4.ON/OFF Switch
(If equipped)
5. Lime build up on Probe(s)
6. Refi ll Valve or Control Board
REMEDY
Press ENABLE BREW switch on control panel to determine if power is ON.
Make sure water is ON.
Brewer has shut down due to malfunction (See Diagnostic Section in this manual).
Make sure ON/OFF Switch is "ON" and indicator is lit.
Remove the Level Probe(s) and check for lime deposit on tip. Clean and reinstall.
Check valve.
Refi ll does not shut off
Power "ON"
1. Lime build up on probe
2. Water Level Sensing System
3. Refi ll valve or control board
Remove Level Probe and check for lime deposits on tip. Clean and reinstall.
Replace control board
Check valve.
Refi ll does not shut off
Power "OFF"
1. Refi ll valve Clean or replace valve as needed.
5
42461 081310
TROUBLESHOOTING (cont.)
HEATING CIRCUIT
PROBLEM
Water does not heat to proper temperature
PROBABLE CAUSE
1. Display's error message
REMEDY
Brewer has shut down due to malfunction. See Diagnostics.
IMPORTANT: Make sure no temperature tests are taken before the display reads ready. Tank temperature must be stabilized before readings are taken.
2. Water not touching main (short) level probe
Remove level probe and grommet.
Look into hole on tank lid. Water must be within approximately one inch from top of tank.
3. Water Level Probe Sensing
System
Check refi ll circuit. Heaters will not turn on if water is not grounding level probe.
4. Temperature Probe Check/replace
5. Limit Thermostat or TCO
6. Tank Heater
Check/replace
Check/replace
Spitting or excessive steaming
(cont.)
1. Lime build up on temperature probe, tank or tank heater
Inspect probe and tank assembly for excessive lime deposits. Delime as required.
2. Temperature Probe Check/replace
3. Control Board Check/replace
Brewer is making unusual noises 1. Plumbing lines
2. Water supply
3. Lime build up
6
Plumbing lines should not rest on the counter top.
The brewer must be connected to a cold water supply.
Remove the tank lid and clean inside of tank with a deliming agent, if necessary.
42461 081310
TROUBLESHOOTING (cont.)
BREWING CIRCUIT
PROBLEM
Brew cycle will not start
PROBABLE CAUSE
1. Display's error message
2. No water
REMEDY
Brewer has shut down due to malfunction. See Diagnostics.
Water lines and valves to the brewer must be open.
3. No power or incorrect voltage to the brewer
Check for voltage across the terminals at the terminal block.
4. ON/OFF switch not in the "ON" position
The indicator lamp must be lit
5. Low water temperature (Brew lockout is enabled)
Allow brewer to heat until ready, or disable the brew lockout feature.
6. Water not touching refi ll probe inside tank
Water must be in contact with refi ll probe before brew cycle will start.
7. Membrane Switch
8. Dispense valve
9. Control board
Check/replace
Check/replace
Check/replace
Consistently low beverage level in the dispenser or beverage overfl ows dispenser
1. Brew volume
NOTE: Volume adjustments must be made with sprayhead installed.
Inspect the dispense valve and sprayhead for excessive lime deposits. Delime as required.
2. Lime build up
3. Dispense Valve
Remove dispense valve and clear any obstructions. Rebuild or replace valve if necessary. (See page 24)
Check/replace
7
42461 081310
TROUBLESHOOTING (cont.)
BREWING CIRCUIT (cont.)
PROBLEM
Dripping from sprayhead
Weak beverage
Dry coffee grounds remain in the funnel
PROBABLE CAUSE
1. Lime build up
2. Dispense valve
1. Sprayhead
2. Water temperature
3. Filter type
4. Coffee grind
5. Funnel loading
1. Sprayhead
2. Funnel loading
REMEDY
Inspect the tank assembly for excessive lime deposits. Delime as required.
Check/replace
A clean sprayhead must be used for proper extraction.
Place an empty brew funnel on an empty decanter beneath the sprayhead. Initiate brew cycle and check the water temperature immediately below the sprayhead with a thermometer. The reading must not be less than 195°F (91°C). Adjust the temperature setting to increase the water temperature. Refer to Initial
Set-up instructions.
BUNN® paper fi lters must be used for proper extraction.
A fi ne drip or grind must be used for proper extraction.
The BUNN® paper fi lter must be centered in the funnel and the bed of grounds leveled by shaking gently.
Make sure sprayhead is present and holes are clear and unobstructed.
The BUNN® paper fi lter must be centered in the funnel and the bed of grounds leveled by shaking gently.
Low beverage serving temperature
1. Thermal server/airpot not preheated before brew cycle
Preheat server
8
42461 081310
DIAGNOSTICS
MESSAGE
PROBABLE CAUSE REMEDY
Temperature Too Low
Heating Time Too Long
Fill Time Too Long
1. Water temperature in the tank does not meet the ready temperature.
A) Wait for the brewer to heat to the proper temperature.
B) Disable the BREW LOCKOUT function. Refer to programming section for procedure.
1. Tank Heater failure.
2. Control Board/Thermistor failure
Replace or repair as needed
Replace or repair as needed
1. Water shut off to brewer
2. Supply line too small or obstructed
Check water supply shut-off
Replace or repair as needed
3. Inlet Solenoid failure
4. Control Board Failure
Replace or repair as needed
Replace or repair as needed
5. ON/OFF switch is OFF Turn switch ON
Temp Sensor Out Of Range, Check
For Bad Connections
1. Temperature Sensor Probe open
Replace or repair as needed
Temp Sensor Out Of Range, Check
Wire For Shorts
1. Temperature Sensor Probe wire(s) shorted
Replace or repair as needed
9
42461 081310
COMPONENT ACCESS
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 qualifi ed service personnel. The brewer should be unplugged when servicing, except when electrical tests are required and the test procedure specifi cally states to plug in the brewer.
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 access panel (ICB), or rear access panel (ITCB & ITB).
Refer to wiring diagrams at the back of this manual when reconnecting wires.
FIG. 10-2 ITB/ITCB COMPONENT ACCESS
FIG. 10-1 ICB/ITCB HV
COMPONENT ACCESS
10
FIG. 10-3 ICB/ITCB HV TWIN
COMPONENT ACCESS
42461 081310
CONTROL BOARD
Removal and Replacement:
1. Disconnect brewer from power source.
2. Disconnect the wires from the relay on the control board.
3. Disconnect all of the connectors from the control board.
4. Remove the two nuts securing the control board to the hood.
5. Tilt the control board inward to clear the display section.
6. Place the bottom edge of the new control board in the cradle, tilt the board forward, and secure with the two nuts to the hood.
FIG. 11-1 CONTROL BOARD
Location:
The Control Board is located inside the top cover behind the front face plate.
Test Procedures:
The test procedures for the control board will vary depending upon the problems experienced by the brewer. Refer to the Troubleshooting section which is divided into three sections, Refi ll Circuit, Heating
Circuit, and Brewing Circuit.
Check for Power to board:
1. Insert one meter lead in J17-pin 9 and the other lead in J17-pin 11 (TR-2 to TR-5 ITB only).
2. With the power connected to brewer, the voltage reading to the board should be the line voltage rated for that model.
If no voltage is present, check wiring to the board. If voltage is present, and brewer does not power on, go to step 3
3. Check for line voltage at J15-1 BLK to J15-2 WHI
(J14-1 to 2 ITB only)
If no voltage is present, replace the control board. If voltage is present, go to step 4
4. Check for 12VAC at J15-4 to J15-2 Yellow wires
(J14-4 to J14-5 ITB only)
If no voltage is present, replace the transformer. If voltage is present, and brewer does not power on, replace the control board.
11
Faceplate Removal and Replacement:
1. Disconnect brewer from power source.
2. Disconnect the ribbon cable from the control board.
3. Models with faucet: Drain tank to below faucet outlet fi tting. Remove hose, nut and washer from faucet. Remove faucet assembly.
4. Remove the four screws securing the face plate to the hood.
5. Carefully pull the ribbon cable through the front opening of the hood.
6. Installation is the reverse order.
FIG. 11-2 FACEPLATE REMOVAL
42461 081310
CONTROL BOARD-ICB TWIN/ITCB DV HV/ITCB TWIN HV TRIAC MAP
TH1/MOV4/BR2
TH2/MOV1
Left Funnel Lock
Refi ll solenoid
TH3/MOV3/BR3 Right Funnel Lock
TH4B/MOV2 Tank
TH5/MOV5
TH6/MOV7
TH7/MOV8
TH8/MOV6
Left Brew Solenoid
Right Brew Solenoid
Left Bypass Solenoid
Right Bypass Solenoid
FIG. 12-1 TRIAC MAP
Connector:
J17-13/J17-14
J17-5
J17-6/J17-7
Relay Terminal
J17-3
J17-2
J17-1
J17-10
12
42461 081310
CONTROL BOARD-ICB/ITCB TRIAC MAP
TH2/MOV1/BR2
TH4B/MOV2
FIG. 13-1 TRIAC MAP
(Optional) Funnel Lock (ICB)
Refi ll solenoid
TH6/MOV4 Brew
TH7/MOV3 Tank
TH9/MOV5 Dilution or Bypass Solenoid
Connector:
J17-13/J17-14
J17-5
J17-3
Relay Terminal
J17-1
13
42461 081310
CONTROL BOARD-ITB TRIAC MAP
TH1/MOV3
TH2/MOV1
Main or Left Dilution
Refi ll solenoid
TH3/MOV2 Brew Solenoid
TH4/MOV4 Right
TH6/MOV6 Sweetner
TH7/MOV7 Tank
FIG. 14-1 TRIAC MAP
Connector:
J10-1
J10-2
J10-3
J10-4
J10-5
TR1/TR6
14
42461 081310
MEMBRANE SWITCH
FIG. 15-1 MEMBRANE SWITCH
Location:
The Membrane Switch is located on the front face plate.
Test Procedures:
There are two methods for testing the membrane switch. The easiest method is to use the built in test mode. Refer to the Programing Section for Service
Tools/Test Switches. If for some reason you can't get into the program modes, or brewer won't power up, you can test it with an ohmmeter or continuity tester.
Refer to the schematic to trace the appropriate pins.
NOTE: Pin 22 is the static shield & will not provide a reading to the other pins. There are two commons in this circuit, pins 9 & 10.
Disconnect brewer from power source before disconnecting ribbon cable from control board.
Removal and Replacement:
1. Disconnect the ribbon cable from the 22-pin connector on the control board.
2. Gently peel the membrane switch from the front face plate assembly.
4 Remove any adhesive that remains on the front face plate.
5. Remove the adhesive backing from the new membrane switch. Insert the ribbon cable through the slot in the front face plate and apply the membrane switch to the front face plate.
6. Connect the ribbon cable to the 22-pin connector on the control board making sure every pin on the control board is inserted into the ribbon cable connector.
Helpful
Hint
Wrap a thin paper clip around each meter lead and extend past the tip by ¼" - ½". You may need to sand off the clear coating on some clips!
FIG. 15-2 MEMBRANE SWITCH CONTINUITY
15
42461 081310
BREW VALVE (EARLY MODELS) AND BYPASS VALVE ON ALL ICB's
observed, brew valve is defective. Replace valve and test again to verify repair.
If voltage is not present as described, refer to Wiring Diagrams and check the brewer wiring harness.
Also check the control board and switch for proper operation.
Removal and Replacement:
1. Disconnect the brewer from the power source.
2. Disconnect wires from the valve.
3. Drain enough water from the tank so the water level is below the outlet.
4. Remove hoses from the valve.
5. Remove the two #8-32 nuts securing the valve to the sprayhead panel.
6. Install new valve using the two #8-32 nuts.
7. Reconnect hoses to the valve and secure in place with clamps.
FIG. 16-1 EARLY BREW VALVE
Location:
The brew valve is located inside the top cover behind the front face plate.
Test Procedures:
1. Refer to the Programing Section for Service Tools/
Test Outputs/Brew Valve.
2. Be sure brew funnel & server are in place before activating valve.
3. Check the valve for coil action. Turn on the valve with the test mode. Listen carefully in the vicinity of the brew valve for a click as the coil pulls the plunger in.
If no sound is heard as described, proceed to
#4.
If the sound is heard as described, there may be a blockage in the valve , hose, tank, or sprayhead.
Disconnect the brewer from the power source.
Remove the valve and inspect for blockage, and de-lime all related areas.
4. Connect the voltmeter leads to the coil terminals.
Turn on the valve with the test mode.
The indication will be 2-3VAC off, 120VAC on. Set the meter to DC volts. The indication should be 150-
160VDC when off, 0V when on. If the polarity of meter leads are reversed, reading will indicate -150-160VDC.
(Double these readings for 240 volt coils)
If voltage is present as described, but no coil action is
16
FIG. 16-2 EXPLODED VIEW
Due to the internally rectifi ed coil, do not attempt to test this type of coil with an ohmmeter. The reading will be open or very high resistance, depending on the polarity of your meter leads.
42461 081310
BREW VALVE (LATE MODELS)
Diagrams and check the brewer wiring harness. Also check the control board and membrane switch for proper operation.
Removal and Replacement:
1. Disconnect the brewer from the power source.
2. Disconnect wires from the valve.
3. Drain enough water from the tank so the water level is below the outlet.
4. Remove sprayhead and hose from the valve.
5. Remove the nut securing the valve to the sprayhead panel.
6. Install new valve using the nut from step 5.
7. Reinstall sprayhead and hose to the valve and secure in place with clamps.
FIG. 17-1 LATE MODEL BREW VALVE
Location:
The brew valve is located inside the top cover behind the front face plate.
Test Procedures:
1. Refer to the Programing Section for Service Tools/
Test Outputs/Brew Valve.
2. Be sure brew funnel & server are in place before activating valve.
3. Check the valve for coil action. Turn on the valve with the test mode. Listen carefully in the vicinity of the brew valve for a click as the coil pulls the plunger in.
If no sound is heard as described, proceed to #4.
If the sound is heard as described, there may be a blockage in the valve , hose, tank, or sprayhead. Disconnect the brewer from the power source. Remove the valve and inspect for blockage, and de-lime all related areas.
4. Connect the voltmeter leads to the coil terminals.
Turn on the valve with the test mode.
The indication will be 2-3VAC off, 120VAC on. Set the meter to DC volts. The indication should be 150-
160VDC when off, 0V when on. If the polarity of meter leads are reversed, reading will indicate -150-160VDC.
(Double these readings for 240 volt coils)
If voltage is present as described, but no coil action is observed, valve is defective. Replace valve and test again to verify repair.
If voltage is not present as described, refer to Wiring
17
FIG. 17-2 LATE MODEL BREW VALVE
Due to the internally rectifi ed coil, do not attempt to test this type of coil with an ohmmeter. The reading will be open or very high resistance, depending on the polarity of your meter leads.
42461 081310
REFILL VALVES
If resistance is not present as described, replace the refi ll valve.
If resistance is present as described, check for debris in the valve.
FIG. 17-1 REFILL VALVES
Removal and Replacement:
1. Remove both wires from the refi ll valve.
2. Verify that the white shutoff clamp between valve and tank is squeezed shut.
3. Disconnect both water lines at the valve.
4. Remove the two screws securing the valve to the component mounting bracket.
5. Using the two screws, install the new valve to the component mounting bracket.
6. Securely fasten the water lines to the valve.
7. Refer to wiring diagrams when reconnecting the wires.
8. Install access panels and covers and refer to Initial
Set-up for refi ll and operation.
Location:
The refi ll valve is located inside the front of the brewer.
Test Procedures:
1. Enter programming level 2, scroll to "Service Tools" then scroll to "Refi ll Valve".
2. Briefl y activate the refi ll valve in the test mode.
With a voltmeter, check the voltage across the coil wires.
3. The indication must be 120 volts ac for two wire 120 volt models and three wire 120/208 -240 volt models or 230 volts ac for two wire 230 volt models.
If voltage is present, proceed to # 4.
If voltage is not present, refer to Wiring Diagrams and check main wiring harness. If harness checks ok, replace control board.
4. Check the refi ll valve for coil action. Briefl y activate the refi ll valve in the test mode and listen carefully near the refi ll valve for a "clicking" sound as the magnetic coil pulls the plunger in.
If the sound is heard as described and water will not pass through the refi ll valve, there may be a blockage in the water line before the refi ll valve or, the solenoid valve may require inspection for wear, and removal of waterborne particles.
If the sound is not heard as described, proceed to # 5.
5. Disconnect the brewer from the power source. 6.
Check for resistance across the coil terminals (200
-2k depending on which coil is being checked).
18
Disassembly:
Bunn does not offer repair/rebuild kits for the refi ll valves, but some disassembly may be accomplished on the early style valves in the event they may need to be cleaned out. Disassembly is not recommended on the newer style, as damage to the valve could occur.
Refer to next page for exploded views.
42461 081310
REFILL VALVES
EARLY ICB CURRENT ICB & & ITB
EARLY ITCB
SCREEN
Flow control used on dual dilution models only
STRAINER
CURRENT ITCB & ITB-DD
SCREEN
19
STRAINER
42461 081310
TANK HEATERS
2268W
Large
Dia.
1425W
Small
Dia.
FIG. 20-2 DV TANK HEATERS
HEATER
1425W-120V
1680W-120V
1800W-120V
2268W-120V
RESISTANCE
9.5-11.0
7.9-9.2
7.4-8.7
5.9-6.9
FIG. 20-1 ICB TWIN TANK HEATERS
Location:
The tank heaters are located inside the tank and secured to the tank bottom.
TERMINAL TO SHEATH - INFINITE (OPEN)
Test Procedures:
1. With a voltmeter, check voltage across the white wire (120V Models) or red wire (120/208-240V
Models) from the terminal block and black wire from the control board. Connect brewer to the power source. The indication must be 120 volts ac for two wire 120 volt models or 208-240 volts ac for three wire 120/208-240 volt models (during a heating cycle).
2. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #3.
If voltage is not present as described, refer to the Wiring Diagrams and check wiring harness.
3. Disconnect the wires from the tank heater terminals.
4. Check resistance value across tank heater terminals and compare to chart.
If resistance is present as described, reconnect the wires, the tank heater is ok.
If resistance is not present as described, replace the tank heater.
20
NOTE- If any resistance is read between sheath and either terminal, remove and inspect heater for cracks in the sheath.
Removal and Replacement:
1. Remove the top cover and front access panel as previously described.
2. Drain water from the tank.
3. Disconnect all the hoses from the tank.
4. Remove the temperature probe from the grommet in the tank lid.
5. Remove the level probe from it's grommet.
6. Disconnect the green wire from the tank lid.
7. Disconnect the wires from tank heater terminals.
8. Remove the nuts securing the tank lid to the tank.
9. Remove the hex nuts securing the tank heater to the bottom of the tank. Remove tank heater(s) with gaskets and discard.
10. Install new tank heater(s) with gaskets to the bottom of the tank and secure with two hex nuts.
11. Install tank lid and secure with nuts.
12. Reconnect the wires to tank heater terminals.
42461 081310
LIMIT THERMOSTAT
FIG. 21-1 LIMIT THERMOSTAT
Location:
The limit thermostat is located on the tank lid (on the front of the tank on twins).
Test Procedures:
1. Disconnect the brewer from the power source and allow to cool.
2. Disconnect the wires from the limit thermostat.
3. With an ohmmeter, check for continuity across the limit thermostat terminals.
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 the 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. Ensure the metal face has good contact with tank.
FIG. 21-2 LIMIT THERMOSTATS
21
42461 081310
TEMPERATURE PROBE
FIG. 22-1 TEMPERATURE PROBE
Location:
The temperature probe is inserted through the tank lid assembly.
Test Procedures:
1. Disconnect the brewer from the power source.
2. With a DC voltmeter, check voltage across the two wires at J13 (J3 on ITB) on control board (black probe to black wire, red probe to white wire refer to FIG 19-2). Connect the brewer to the power source. The indication should be between 4vdc
(cool) to 1vdc at ready temperature.
3. Disconnect the brewer from the power source.
If voltage is present as described, circuit is working correctly.
If voltage is not present as described, proceed to
#4.
FIG. 22-2 TEMPERATURE PROBE
4. Disconnect temperature probe from J9 on control board. Check the resistance across the two terminals of the temperature probe. The indication should be between 10.5K cool to 870 at ready temperature.
FIG. 22-3 TESTING TEMPERATURE PROBE
If resistance is to specifi cation, replace the control board.
If resistance is not to specifi cation, replace the temperature probe.
22
Removal and Replacement:
CONTINUED
42461 081310
TEMPERATURE PROBE
Removal and Replacement:
1. Disconnect the brewer from the power source.
2. Disconnect the two pin connector from J9 on control board.
3. Pull temperature probe out of it's grommet.
4. Install in reverse order.
Calibration:
1. Remove silicon vent fi tting from tank lid.
2. Insert a digital temp probe through the exposed vent hole in tank lid to the same depth as the factory temp probe. FIG 20-1.
3. Press and hold the "Hidden" button until display reads "CAL TEMPERATURE SENSOR?" "NO/YES"
4. Select "YES". The display should show something similar to the screen below (FIG 20-2).
NOTE: Variables such as tank set temperature could
show different numbers than the example shown here. Tank must be at it's ready temp before calibrating.
5. Press the + (Control) button to increase or - (Digital) button to decrease temperature reading until it matches the reading on the thermometer.
6. Exit program mode, remove thermometer, and install vent fi tting. Calibration is complete
200° CAL 200°
(-) DONE (+)
FIG. 23-2 CALIBRATION
Adjust this number
FIG. 23-1 CALIBRATE TEMP PROBE
23
42461 081310
VOLTAGE SELECTOR SWITCH
Removal and Replacement:
1. Disconnect the brewer from the power source.
2. Disconnect the three wires from the selector switch.
3. Remove the switch mounting nut from the under side of component mounting bracket; remove switch from bracket.
4. Install new switch in component mounting bracket and secure with mounting nut.
FIG. 24-1 VOLTAGE SELECTOR SWITCH
Location:
The voltage selector switch is located on the component mounting bracket on the base plate.
Test Procedure:
1. Disconnect the brewer from the power source.
2. Disconnect the wires from the selector switch. With the selector switch in the 120V position, check for continuity between the two right terminals of the switch.
3. With the selector switch in the 120/208-240V position, check for continuity between the two left terminals.
If continuity is not present as described, replace the switch.
FIG. 24-2 VOLTAGE SELECTOR
SWITCH TERMINALS
24
42461 081310
POWER SWITCH
Removal and Replacement:
1. Disconnect the brewer from the power source.
2. Disconnect the wires from the power switch.
3. Remove the switch mounting screws from the left side of trunk.
4. Install new switch in trunk with the two 6-32 x ¼˝ mounting screws.
L2
FIG. 25-1 POWER SWITCH (ICB SHOWN)
Location:
The power switch is located on the lower right side of the trunk (ICB) or lower rear panel (ITCB).
Test Procedure:
1. Disconnect the brewer from the power source.
2. Disconnect the wires from the power switch. With the switch in the ON position, check for continuity between the upper and lower terminals on each side of the switch.
There should be continuity between the two left terminals and between the two right terminals when ON, no continuity when OFF.
If continuity is not present as described, replace the switch.
FIG. 25-2 ROCKER SWITCH
FIG. 25-3 TOGGLE SWITCH
L1
25
42461 081310
L1 L2
SCHEMATIC WIRING DIAGRAM
ITCB-DV & ITCB-C-DV
LIMIT
BLK-14
THERMOSTAT
BLU-14
#
!
2
"
/
$
2
/
,
.
4
#
/
0
BLK
J1-1
J1-2
VIO
COM
N.O.
J17-1
WHI/VIO
BLU-14
BLK-14
WHI/VIO
FUNNEL SENSOR
1 3
WHI/GRN
J17-5
J17-10
WHI/BLU
BLK
WHI
MAIN ON/OFF SWITCH
(Late Models only)
BLK-18
BLK-14
TANK HEATER
BLK-14 BLU-14
1680W
(1425W ITCB-C-DV ONLY)
SELECTOR
SWITCH
WHI-14
WHI/VIO-14
TANK HEATER
RED-14
1800W
WHI/GRN
SOL
WHI/VIO
DISPENSE
SOL
DILUTION
WHI/BLU
GRN
SOL
REFILL
WHI
WHI
WHI
WHI
N
J17-14
J15-1
TRANSFORMER
10VA
J15-5
J13-1
J3-1
WHI
BLK
PNK
GRN
LEVEL
PROBE t
J3-5
J3-8
J2-1
1
CONTROL PANEL ASSY
J2-5
J2-10
J2-15
BREW
A
BREW
C
HALF
BREW
B
PROG L
PROG R
FULL
ON/OFF
HALF
FULL
ON/OFF
J2-20
J2-22
J16-1
GRN
WHI
RED
BLK
J16-5
J18-1
22
MEMORY
BOARD
STATIC
SHIELD
(Early Models only)
J9-1
120V AC 2 WIRE
120/208V AC 3 WIRE
120/240V AC 3 WIRE
SINGLE PHASE
36460.0000D 02/07 ©2004 BUNN-O-MATIC CORPORATION
J9-7
26
42461 081310
L1
SCHEMATIC WIRING DIAGRAM iTCBA, iTCBB
GRN/YEL
BLK
RED
BLK
LIMIT
THERMOSTAT
BLK-14
BLU-14
"
/
!
2
$
2
/
,
.
4
#
/
0
#
BLK
J1-1
J1-2
VIO
COM
N.O.
J17-1
WHI/VIO
BLU-14
BLK-14
WHI/VIO
FUNNEL SENSOR
1 3
WHI/GRN
J17-5
J17-10
WHI/BLU
BLK
RED
BLK RED
BLK
EMI
FILTER
RED
BLK-14
WHI/GRN
TANK HEATER
3500W
RED
RED-14
SOL
WHI/VIO
DISPENSE
SOL
DILUTION
WHI/BLU
SOL
REFILL
RED-14
RED
RED
RED
RED
L2
J17-14
J15-1
J15-5
J13-1
J3-1
TRANSFORMER
10VA
WHI
BLK
PNK
GRN
LEVEL
PROBE t
J3-5
J3-8
J2-1
1
CONTROL PANEL ASSY
J2-5
J2-10
BREW
A
BREW
C
HALF
PROG L
PROG R
FULL
J2-15
BREW
B
ON/OFF
HALF
FULL
ON/OFF
J2-20
J2-22
J16-1
GRN
WHI
RED
BLK
J16-5
J18-1
J9-1
22
MEMORY
BOARD
STATIC
SHIELD
(Early Models only)
200V AC 2 WIRE
230V AC 2 WIRE
SINGLE PHASE
36460.0001C 08/09 ©2004 BUNN-O-MATIC CORPORATION
J9-7
27
42461 081310
L1
L2
SCHEMATIC WIRING DIAGRAM
ITCB-DV & ITCB-C-DV
LIMIT
BLK-14
THERMOSTAT
BLU-14
BLK
FUNNEL SENSOR
J1-1
J1-2
2
/
,
.
4
#
/
0
#
"
/
!
2
$
COM
N.O.
J17-1
J17-5
J17-10
VIO
WHI/VIO
BLU-14
BLK-14
WHI/VIO
WHI/GRN
WHI/BLU
BLK
WHI
1 3
GRN
MAIN ON/OFF SWITCH
(Late Models only)
BLK-18
BLK-14
(1425W ITCB-C-DV ONLY)
TANK HEATER
BLK-14 BLU-14
SELECTOR
SWITCH
WHI-14
1680W
WHI/GRN
BRN/WHI
SOL
BRN/WHI
WHI/VIO
DISPENSE
WHI/VIO-14
TANK HEATER
RED-14
1800W
SOL
WHI
OPTIONAL
SWEETENER
KIT
DILUTION
SOL
WHI/BLU
SOL
REFILL
WHI
WHI
WHI
WHI
N
J17-14
J15-1
TRANSFORMER
10VA
J15-5
J13-1
J3-1
WHI
BLK
PNK
GRN
LEVEL
PROBE t
J3-5
J3-8
J2-1
1
CONTROL PANEL ASSY
J2-5
J2-10
BREW
A
BREW
C
HALF
PROG L
PROG R
FULL
J2-15
BREW
B
ON/OFF
HALF
FULL
ON/OFF
J2-20
J2-22
J16-1
GRN
WHI
RED
BLK
J16-5
J18-1
22
MEMORY
BOARD
STATIC
SHIELD
(Early Models only)
J9-1
120V AC 2 WIRE
120/208V AC 3 WIRE
120/240V AC 3 WIRE
SINGLE PHASE
36460.0003A 06/08 ©2008 BUNN-O-MATIC CORPORATION
J9-7
28
42461 081310
L1
L2
SCHEMATIC WIRING DIAGRAM
ITCB-DV & ITCB-C-DV
Chassis Ground
WITH FACTORY SWEETENER
LIMIT
BLK-14
THERMOSTAT
BLU-14
BLK
FUNNEL SENSOR
J1-1
J1-2
2
/
,
.
4
#
/
0
#
"
/
!
2
$
COM
N.O.
J17-1
J17-5
J17-10
VIO
WHI/VIO
BLU-14
BLK-14
WHI/VIO
WHI/GRN
WHI/BLU
BLK
WHI
1 3
BLK-18
BLK-14
TANK HEATER
BLK-14 BLU-14
1680W
(1425W ITCB-C-DV ONLY)
SELECTOR
SWITCH
WHI-14
WHI/VIO-14
TANK HEATER
RED-14
1800W
WHI/GRN
SOL
WHI/VIO
DISPENSE
BRN/WHI
SOL
SWEETENER
MAIN ON/OFF SWITCH
(Late Models only)
SOL
DILUTION
WHI/BLU
Earth Ground
SOL
REFILL
WHI
WHI
WHI
WHI
WHI
N
J17-14
J15-1
TRANSFORMER
10VA
J15-5
J13-1
J3-1
J3-5
J3-8
J2-1
WHI
BLK
PNK
GRN
1
LEVEL
PROBE t
BLU
WHI/BLU
CONTROL PANEL ASSY
LOW PRODUCT
DETECT SWITCH
C
NC
NO
J2-5
J2-10
BREW
A
BREW
C
HALF
PROG L
PROG R
FULL
J2-15
BREW
B
ON/OFF
HALF
FULL
ON/OFF
J2-20
J2-22
J16-1
22
STATIC
SHIELD
J16-5
J18-1
J9-1
120V AC 2 WIRE
120/208V AC 3 WIRE
120/240V AC 3 WIRE
SINGLE PHASE
36460.0004A 10/08 ©2008 BUNN-O-MATIC CORPORATION
J9-7
29
42461 081310
L1
L2
N
SCHEMATIC WIRING DIAGRAM ICB-DV
GRN
LIMIT
BLK-14
THERMOSTAT
BLU-14
0
#
!
2
"
/
$
2
/
,
.
4
#
/
BLK
J1-1
J1-2
VIO
COM
N.O.
J17-1
WHI/VIO
BLU-14
BLK-14
WHI/RED
FUNNEL SENSOR
1 3
WHI/GRN
J17-5
J17-10
WHI/BLU
BLK
WHI
J17-14
BRN/BLK
BRN/WHI
J15-1
TRANSFORMER
10VA
J15-5
J13-1
J3-1
WHI
BLK
PNK
GRN
LEVEL
PROBE
MAIN ON/OFF SWITCH
(Late Models only)
BLK-14
TANK HEATER
1680W
BLK-18
BLK-14
BLU-14
SELECTOR
SWITCH
WHI-14
WHI/VIO-14
TANK HEATER
RED-14
2268W
WHI/GRN
SOL
WHI/RED
DISPENSE
SOL
BYPASS
SOL
WHI/BLU
FUNNEL LOCK
(Optional)
SOL
REFILL t
J3-5
WHI
WHI
WHI
WHI
J3-8
J2-1
1
CONTROL PANEL ASSY
J2-5
J2-10
BREW
A
BREW
C
HALF
PROG L
PROG R
FULL
J2-15
BREW
B
ON/OFF
HALF
FULL
ON/OFF
J2-20
J2-22
J16-1
GRN
WHI
RED
BLK
J16-5
J18-1
22
MEMORY
BOARD
STATIC
SHIELD
(Early Models only)
J9-1
120V AC 2 WIRE
120/208V AC 3 WIRE
120/240V AC 3 WIRE
SINGLE PHASE
37299.0000B 02/07 ©2004 BUNN-O-MATIC CORPORATION
J9-7
30
42461 081310
SCHEMATIC WIRING DIAGRAM ICB TWIN
GRN
LEFT
FUNNEL SENSOR
1 3
J20-1
VIO
J20-3
WHI/VIO
J21-1
YEL
0
#
!
2
"
/
$
2
/
,
.
4
#
/
J21-3
COM
N.O.
J17-1
J17-5
J17-10
WHI/YEL
BLU-14
BLK-14
WHI/RED
ORN
WHI/GRN
WHI/BLU
BLU
BLU/BLK
BLK
GRY
WHI
RIGHT
FUNNEL SENSOR
1 3
BRN/BLK
BRN/WHI
J17-14
J15-1
TRANSFORMER
10VA
J15-5
J13-1
WHI
BLK
LEVEL
PROBE
J3-1
PNK
GRN t
J3-5
J3-8
J2-1
1
SOL
MAIN ON/OFF SWITCH
(Late Models only)
BLK-18
BLK-14
LIMIT
THERMOSTAT
BLU-14 BLU-14
TANK HEATER
RED-14
LIMIT
THERMOSTAT
BLU-14
BLU-14
TANK HEATER
RED-14
SOL
LEFT
BYPASS
SOL
RIGHT
DISPENSE
SOL
LEFT
DISPENSE
SOL
REFILL
RIGHT
FUNNEL LOCK
(Optional)
SOL
RIGHT
BYPASS
SOL
LEFT
FUNNEL LOCK
(Optional)
CONTROL PANEL ASSY
J2-5
J2-10
J2-15
J2-20
J2-22
J16-1
J16-5
GRN
WHI
RED
BLK
MEMORY
BOARD
(Early Models only)
120/208 OR 120/240
VOLTS AC
3 WIRE + GND
SINGLE PHASE
22
STATIC
SHIELD
37299.0001C 02/07 ©2005 BUNN-O-MATIC CORPORATION
31
LEFT
ON/OFF
LEFT
FULL
LEFT
HALF
RIGHT
ON/OFF
RIGHT
FULL
RIGHT
HALF
L1 L2 N
WHI
WHI
WHI
WHI
WHI
WHI
PROG
“Digital”
LEFT
BREW
C
LEFT
ON/OFF
LEFT
FULL
RIGHT
FULL
RIGHT
BREW
C
RIGHT
BREW
B
PROG
“Control”
RIGHT
HALF
RIGHT
ON/OFF
RIGHT
PROG
RIGHT
BREW
A
PROG
“Brewer”
LEFT
PROG
LEFT
BREW
B
LEFT
BREW
A
LEFT
HALF
42461 081310
SCHEMATIC WIRING DIAGRAM iCBA, iCBB
GRN/YEL
L1
BLK
J13-1
LEVEL
PROBE
BLK RED
BLK
EMI
FILTER
RED
BLK
THERMOSTAT
BLK-14
LIMIT
BLU-14
0
#
!
2
"
/
$
2
/
,
.
4
#
/
BLK
FUNNEL SENSOR
J1-1
J1-2
VIO
COM
N.O.
J17-1
WHI/VIO
BLU-14
BLK-14
WHI/RED
1 3
WHI/GRN
J17-5
J17-10
WHI/BLU
BLK
RED
BLK-14
TANK HEATER
3500W
WHI/GRN
SOL
WHI/RED
DISPENSE
SOL
BYPASS
WHI/BLU
SOL
REFILL
J17-14
BRN/BLK
BRN/WHI
SOL
FUNNEL LOCK
(Optional)
J15-1
RED
TRANSFORMER
10VA
J15-5
WHI
BLK
PNK
J3-1
GRN
RED t
J3-5
RED-14
RED
RED
RED
RED
L2
J3-8
J2-1
1
CONTROL PANEL ASSY
J2-5
J2-10
BREW
A
BREW
C
HALF
PROG L
PROG R
FULL
J2-15
BREW
B
ON/OFF
HALF
FULL
ON/OFF
J2-20
J2-22
J16-1
GRN
WHI
RED
BLK
J16-5
J18-1
J9-1
22
MEMORY
BOARD
STATIC
SHIELD
(Early Models only)
200V AC 2 WIRE
230V AC 2 WIRE
SINGLE PHASE
J9-7
37299.0002B 08/09 ©2005 BUNN-O-MATIC CORPORATION
32
42461 081310
L1 L2
GRN/YEL
SCHEMATIC WIRING DIAGRAM ICB TWIN 230V
Chassis Ground
TERM
BLOCK
GRN
LEFT
FUNNEL SENSOR
1 3
J20-1
VIO
J20-3
WHI/VIO
J21-1
YEL
"
/
!
2
$
2
/
,
.
4
#
/
0
#
J21-3
COM
N.O.
J17-1
J17-5
J17-10
WHI/YEL
BLU-14
BLK-14
WHI/RED
ORN
WHI/GRN
WHI/BLU
BLU
BLU/BLK
BLK
GRY
RED
RIGHT
FUNNEL SENSOR
1 3
BRN/BLK
BRN/WHI
J17-14
J15-1
TRANSFORMER
10VA
J15-5
J13-1
WHI
BLK
LEVEL
PROBE
J3-1
PNK
GRN t
J3-5
J3-8
J2-1
1
SOL
SOL
Chassis Ground
BLK-18
BLK-14
LIMIT
BLU-14
THERMOSTAT
BLU-14
TANK HEATER
RED-14
EMI
FILTER
LIMIT
BLU-14
THERMOSTAT
BLU-14
TANK HEATER
RED-14
SOL
LEFT
BYPASS
SOL
RIGHT
DISPENSE
SOL
LEFT
DISPENSE
SOL
REFILL
RIGHT
FUNNEL LOCK
(Optional)
SOL
RIGHT
BYPASS
RED
RED
RED
RED
RED
RED
LEFT
FUNNEL LOCK
(Optional)
CONTROL PANEL ASSY
J2-5
J2-10
J2-15
J2-20
J2-22
J16-1
J16-5
GRN
WHI
RED
BLK
MEMORY
BOARD
(Early Models only)
22
LEFT
ON/OFF
LEFT
FULL
LEFT
HALF
RIGHT
ON/OFF
RIGHT
FULL
RIGHT
HALF
PROG
“Digital”
LEFT
BREW
C
LEFT
ON/OFF
LEFT
FULL
RIGHT
FULL
RIGHT
BREW
C
RIGHT
BREW
B
PROG
“Control”
RIGHT
HALF
RIGHT
ON/OFF
RIGHT
PROG
RIGHT
BREW
A
PROG
“Brewer”
LEFT
PROG
LEFT
BREW
B
LEFT
BREW
A
LEFT
HALF
STATIC
SHIELD
230 VOLTS AC
2 WIRE + GND
SINGLE PHASE
37299.0004A 12/08 ©2008 BUNN-O-MATIC CORPORATION
33
42461 081310
L1
L2
WHI
SCHEMATIC WIRING DIAGRAM ITB
SINGLE & DUAL DILUTION MODELS
AND MODELS w/OPTIONAL SWEETENER
TR-5 TR-2
TR-6
2
/
,
.
4
#
/
0
#
"
/
!
2
$
TR-1
J10-1
J10-5
J10-10
RED
BLU/BLK
WHI/VIO
WHI/BLU
WHI/GRN
WHI/YEL
WHI/RED
TANK HEATER
BLK
LIMIT THERMOSTAT
SOL
SOL
DILUTION (MAIN or LEFT)
SOL
REFILL
DISPENSE
SOL
RIGHT DILUTION (DUAL DILUTION MODELS ONLY)
SOL
OPTIONAL SWEETENER
WHI
WHI
WHI
WHI
WHI
J14-1
J14-5
BLK
WHI
YEL
YEL
L-1
L-2
12VAC
TRANSFORMER
10VA
J3-1
J2-1
J2-5
J2-8
WHI
BLK
PNK
LEVEL
PROBE
TEMP
PROBE
GRN t
OPTIONAL LOW PRODUCT
DETECT SWITCH
ORN
WHI/ORN
1
2
3
1. JUMPER FOR DUAL DILUTION MODELS ONLY
2. JUMPER FOR SWEETENER MODELS ONLY
3. JUMPER FOR DUAL DILUTION MODELS w/SWEETENER ONLY
1 MEMBRANE SWITCH ASSY
J15-1
J15-5
BREW
A
BREW
C
PROG L
PROG R
J15-10
HALF
FULL
J15-15
BREW
B
ON/OFF
HALF
FULL
ON/OFF
J15-20
J15-22
STATIC
SHIELD
22
120V AC 2 WIRE + GROUND
SINGLE PHASE
42377.0000B 12/09 ©2009 BUNN-O-MATIC CORPORATION
34
42461 081310
GRN/YEL
SCHEMATIC WIRING DIAGRAM ITCB-DV HV
Earth Ground Chassis Ground
MAIN ON/OFF SWITCH
L1
L2
BLK-14
LIMIT
THERMOSTAT
BLU-14
C
B
O
A
R
D
R
O
L
C
O
N
T
P
BLK
J1-1
J1-2
VIO
COM
N.O.
J17-1
WHI/VIO
BLU-14
BLK-14
WHI/RED
FUNNEL SENSOR
1 3
WHI/GRN
J17-5
J17-10
WHI/BLU
BLK
WHI/VIO
WHI
BLK-18
BLK-14
BLK-14
TANK HEATER
1680W
SELECTOR SWITCH
WHI-14
BLU-14
WHI/VIO-14
TANK HEATER
RED-14
2268W
WHI/GRN
SOL
WHI/RED
DISPENSE
BLK
SOL
BYPASS
COOLING FAN
MOT
WHI
WHI/BLU
REFILL
SOL
WHI
WHI
WHI
WHI/VIO
DILUTION
SOL
WHI
WHI
N
J17-14
J15-1
TRANSFORMER
10VA
J15-5
J13-1
J3-1
J3-5
J3-8
J2-1
WHI
BLK
PNK
GRN t˚
COOLING FAN
THERMISTOR t˚
LEVEL
PROBE
1
CONTROL PANEL ASSY
J2-5
J2-10
J2-15
BREW
A
BREW
C
HALF
BREW
B
PROG L
PROG R
FULL
ON/OFF
HALF
FULL
ON/OFF
J2-20
J2-22
STATIC
SHIELD
J18-1
J9-1
J9-7
120V AC 2 WIRE
120/208V AC 3 WIRE
120/240V AC 3 WIRE
SINGLE PHASE
43828.0000A 11/10 ©2010 BUNN-O-MATIC CORPORATION
35
SCHEMATIC WIRING DIAGRAM ITCB HV TWIN
L1 L2 N
LEFT
FUNNEL SENSOR
1 3
J20-1
VIO
J20-3
WHI/VIO
J21-1
YEL
C
B
O
A
R
D
R
O
L
C
O
N
T
P
J21-3
COM
N.O.
J17-1
J17-5
J17-10
WHI/YEL
BLU-14
BLK-14
WHI/RED
ORN
WHI/GRN
WHI/BLU
RED
BLK
BLK
GRY
WHI
RIGHT
FUNNEL SENSOR
1 3
RED/BLK
BLU/BLK
J17-14
J15-1
TRANSFORMER
10VA
J15-5
J13-1
WHI
BLK
J3-1
J3-5
PNK
GRN t˚
COOLING FAN
THERMISTOR t˚
LEVEL
PROBE
BLK
BLK
BLK
J3-8
J2-1
1
K1
Earth Ground
GRN
Chassis Ground
MAIN ON/OFF SWITCH
BLK-18
BLK-14
LIMIT
THERMOSTAT
BLU-14 BLU-14
TANK HEATER
RED-14
LIMIT
THERMOSTAT
BLU-14
BLU-14
TANK HEATER
RED-14
SOL
LEFT
BYPASS
SOL
RIGHT
DISPENSE
SOL
LEFT
DISPENSE
SOL
REFILL
RIGHT
DILUTION
RELAY
SOL
RIGHT
BYPASS
K2
LEFT
DILUTION
RELAY
CONTROL PANEL ASSY
K2
K1
WHI/YEL
SOL
LEFT
DILUTION
COOLING FAN
MOT
WHI/VIO
SOL
RIGHT
DILUTION
J2-5
J2-10
WHI
WHI
WHI
WHI
WHI
WHI
WHI
WHI
WHI
RIGHT
FULL
RIGHT
BREW
C
RIGHT
BREW
B
PROG
“Control”
RIGHT
HALF
RIGHT
ON/OFF
RIGHT
PROG
RIGHT
BREW
A
J2-15
J2-20
J2-22
22
LEFT
ON/OFF
LEFT
FULL
LEFT
HALF
RIGHT
ON/OFF
RIGHT
FULL
RIGHT
HALF
PROG
“Digital”
LEFT
BREW
C
LEFT
ON/OFF
LEFT
FULL
PROG
“Brewer”
LEFT
PROG
LEFT
BREW
B
LEFT
BREW
A
LEFT
HALF
STATIC
SHIELD
120/208 OR 120/240
VOLTS AC
3 WIRE + GND
SINGLE PHASE
44145.0000A 01/11 ©2011 BUNN-O-MATIC CORPORATION
36
37
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