ITB/ITCB/HV ICB SH/DV/TWIN New Infusion Series® SERVICE MANUAL INSTALLATION & OPERATING GUIDE BUNN-O-MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD, ILLINOIS 62708-3227 PHONE: (217) 529-6601 FAX: (217) 529-6644 www.bunn.com To ensure you have the latest revision of the Operating Manual, 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.
BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows: 1) Airpots, thermal carafes, decanters, GPR servers, iced tea/coffee dispensers, MCR/MCP/MCA single cup brewers, thermal servers and ThermoFresh® servers (mechanical and digital) 1 year parts and 1 year labor. 2) All other equipment - 2 years parts and 1 year labor plus added warranties as specified below: a) Electronic circuit and/or control boards - parts and labor for 3 years.
INTRODUCTION This equipment will brew a half-gallon batch of coffee into an awaiting dispenser. It can be easily configured 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.............................................................................
TROUBLESHOOTING A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems encountered. If the problem remains after exhausting the troubleshooting steps, contact the Bunn-O-Matic Technical Service Department. • • • • • • • Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel. All electronic components have ac line voltage and some have low voltage dc potential on their terminals.
TROUBLESHOOTING (cont.) REFILL CIRCUIT PROBLEM PROBABLE CAUSE REMEDY Will not refill 1. Power off to brewer Press ENABLE BREW switch on control panel to determine if power is ON. 2. Water shut off Make sure water is ON. 3. Error Message Brewer has shut down due to malfunction (See Diagnostic Section in this manual). 4.ON/OFF Switch (If equipped) Make sure ON/OFF Switch is "ON" and indicator is lit. 5. Lime build up on Probe(s) Remove the Level Probe(s) and check for lime deposit on tip.
TROUBLESHOOTING (cont.) HEATING CIRCUIT PROBLEM PROBABLE CAUSE REMEDY Water does not heat to proper temperature 1. Display's error message Brewer has shut down due to malfunction. See Diagnostics. 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 refill circuit. Heaters will not turn on if water is not grounding level probe. 4.
TROUBLESHOOTING (cont.) BREWING CIRCUIT PROBLEM Brew cycle will not start PROBABLE CAUSE 1. Display's error message REMEDY Brewer has shut down due to malfunction. See Diagnostics. 2. No water 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.
TROUBLESHOOTING (cont.) BREWING CIRCUIT (cont.) PROBLEM PROBABLE CAUSE REMEDY Dripping from sprayhead 1. Lime build up Inspect the tank assembly for excessive lime deposits. Delime as required. 2. Dispense valve Check/replace 1. Sprayhead A clean sprayhead must be used for proper extraction. 2. Water temperature 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.
DIAGNOSTICS MESSAGE PROBABLE CAUSE REMEDY Temperature Too Low 1. Water temperature in the tank does not meet the ready temperature. A) Wait for the brewer to heat to the proper temperature. 1. Tank Heater failure. Replace or repair as needed 2. Control Board/Thermistor failure Replace or repair as needed 1. Water shut off to brewer Check water supply shut-off 2. Supply line too small or obstructed Replace or repair as needed 3. Inlet Solenoid failure Replace or repair as needed 4.
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 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.
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 screws securing the control board to the faceplate. 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. 7. Re-install connectors. FIG.
FIG.
MEMBRANE SWITCH 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.
BYPASS VALVE ON ALL ICB's If voltage is present as described, but no coil action is 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.
BREW VALVE If voltage is not present as described, refer to Wiring 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.
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 refill and operation. REFILL VALVES FIG. 16-1 REFILL VALVES Location: The refill valve is located inside the front of the brewer.
TANK HEATERS 2268W Large Dia. 1425W Small Dia. FIG. 17-2 DV TANK HEATERS HEATER RESISTANCE 1425W-120V 9.5-11.0 3500W-240V 15.1-17.6 1680W-120V 7.9-9.2 1800W-120V 7.4-8.7 2268W-120V 5.9-6.9 3000W-208V 12.9-15.1 3000W-240V 17.9-20.7 3500W-200V 10.5-12.2 TERMINAL TO SHEATH - INFINITE (OPEN) FIG. 17-1 ICB TWIN TANK HEATERS Location: The tank heaters are located inside the tank and secured to the tank bottom. Test Procedures: 1.
LIMIT THERMOSTAT FIG. 18-1 LIMIT THERMOSTAT Location: The limit thermostat is located on the tank lid (on the front of the tank on twins). FIG. 18-2 LIMIT THERMOSTATS 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.
TEMPERATURE PROBE FIG. 19-1 TEMPERATURE PROBE Location: The temperature probe is inserted through the tank lid assembly. FIG. 19-2 TEMPERATURE PROBE 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.
TEMPERATURE PROBE 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.
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. 21-1 VOLTAGE SELECTOR SWITCH Location: The voltage selector switch is located on the component mounting bracket on the base plate. Test Procedure: 1.
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. L1 L2 FIG. 22-1 POWER SWITCH (ICB SHOWN) Location: The power switch is located on the lower right side of the trunk (ICB) or lower rear panel (ITCB). FIG. 22-2 POWER SWITCH Test Procedure: 1. Disconnect the brewer from the power source. 2.
SOFTHEAT POWER 3. On the Twin, remove two screws securing power supply to base. On the single, remove two screws securing component mounting bracket to base, then remove four screws securing power supply to component mounting bracket. NOTE: When installing new power supply, verify the voltage selector switch is set to the proper voltage. FIG. 23-1 SOFTHEAT CONTACTS L1 Location: The SoftHeat contacts are located on the lower front of the trunk. L2 or NEUTRAL 24V + 24V POWER LED FIG.
TROUBLESHOOTING SOFT HEAT FEATURE AT BREWER: Issue: SH server lights not working when sitting on brewer 1. Check to make sure server is fully engaged and touching brewer contacts. 2. Check brewer contacts with multimeter, should be getting 24 VDC 3. If no power is showing up at brewer contacts remove front panel. Power off brewer, check that wiring connections to the back of the contacts are secure and not loose. Tighten if loose and power back up to confirm 24 VDC with multimeter 4.
TROUBLESHOOTING SOFT HEAT FEATURE AT BREWER: 4. Check to make sure nothing metal is sitting under server stand or metal walls blocking signal for server stand to brewer. (Stand may need repositioned close or away from material that will block the radio signal) Issue: SH stand dropping from webpage dashboard (Wireless models only) 1.
WHI GRN SCHEMATIC WIRING DIAGRAM ITCB-DV N L2 RED BLK L1 MAIN ON/OFF SWITCH BLK-18 BLK-14 LIMIT THERMOSTAT TRIAC BLU-14 BLK-14 BLK CONTROL P C BOARD J1-1 J1-2 TR1 TR2 J17-1 FUNNEL SENSOR 1 3 VIO SELECTOR SWITCH WHI-14 BLU-14 TANK HEATER WHI/VIO-14 1680W (1425W ITCB-C-DV ONLY) RED-14 1800W WHI/VIO TAN WHI/VIO WHI/VIO WHI/GRN J17-5 TANK HEATER WHI/GRN SOL DISPENSE SOL DILUTION WHI WHI WHI/BLU WHI/BLU SOL REFILL WHI BLK J17-10 J17-14 J15-1 J15-5 BRN/BLK BRN/WHI SOL FU
L1 N SCHEMATIC WIRING DIAGRAM ITCB-A,B&CE w/TRIACS BLU BRN GRN/YEL MAIN ON/OFF SWITCH Chassis Ground Chassis Ground BLU BRN GRN/YEL EMI FILTER CONTROL P C BOARD J1-1 J1-2 TR1 TR2 J17-1 VIO TRIAC FUNNEL SENSOR 1 3 TANK HEATER THERMAL FUSE RED-14 WHI/VIO TAN WHI/VIO WHI/VIO WHI/GRN J17-5 LIMIT THERMAL THERMOSTAT FUSE BLU-14 BLK-14 RED BLK-18 BLK-14 WHI/GRN SOL DISPENSE SOL DILUTION RED RED WHI/BLU WHI/BLU SOL REFILL RED BLK J17-10 J17-14 J15-1 J15-5 BRN/BLK BRN/WHI BRN
WHI GRN N L2 RED BLK L1 SCHEMATIC WIRING DIAGRAM ICB-DV MAIN ON/OFF SWITCH (Late Models only) BLK-18 BLK-14 LIMIT THERMOSTAT TRIAC BLU-14 BLK-14 TANK HEATER SELECTOR SWITCH WHI-14 BLU-14 WHI/VIO-14 1680W BLK CONTROL P C BOARD J1-1 J1-2 TR1 TR2 J17-1 VIO RED-14 2268W FUNNEL SENSOR 1 3 WHI/VIO TAN WHI/RED WHI/RED WHI/GRN J17-5 TANK HEATER WHI/GRN SOL DISPENSE SOL BYPASS WHI WHI WHI/BLU WHI/BLU SOL REFILL WHI BLK J17-10 J17-14 J15-1 J15-5 WHI WHI BRN/BLK BRN/WHI BLK WHI
GRN N L2 WHI BLK L1 RED SCHEMATIC WIRING DIAGRAM ICB TWIN MAIN ON/OFF SWITCH (Late Models only) BLK-18 BLK-14 MT2 CONTROL P C BOARD J20-1 VIO J20-3 WHI/VIO J21-1 YEL J21-3 WHI/YEL TAN TAN TR1 TR2 J17-1 J17-5 J17-10 J17-14 J15-1 J15-5 LEFT FUNNEL SENSOR 1 3 MT2 TRIAC MT1 TRIAC MT1 LIMIT THERMOSTAT BLU-14 BLU-14 LIMIT THERMOSTAT BLU-14 BLU-14 RIGHT FUNNEL SENSOR 1 3 SOL SOL RIGHT FUNNEL LOCK BLK GRY WHI SOL J3-1 PNK GRN LEFT DISPENSE RIGHT BYPASS WHI REFILL WHI WHI WH
L1 N SCHEMATIC WIRING DIAGRAM ICBA,ICBB & CE w/TRIACS BLU BRN GRN/YEL MAIN ON/OFF SWITCH Chassis Ground Chassis Ground BLU BRN GRN/YEL EMI FILTER BLK-18 BLK-14 CONTROL P C BOARD J1-1 J1-2 TR1 TR2 J17-1 VIO FUNNEL SENSOR 1 3 TRIAC TANK HEATER THERMAL FUSE RED RED-14 WHI/VIO TAN WHI/RED WHI/RED WHI/GRN J17-5 LIMIT THERMAL THERMOSTAT FUSE BLU-14 BLK-14 WHI/GRN SOL DISPENSE SOL BYPASS WHI/BLU WHI/BLU RED RED SOL REFILL RED BLK J17-10 J17-14 J15-1 J15-5 RED RED BRN/BLK BRN
N L2 WHI RED L1 GRN BLK SCHEMATIC WIRING DIAGRAM ITCB HV TWIN MAIN ON/OFF SWITCH BLK-18 BLK-14 LIMIT TRIAC THERMOSTAT MT2 MT1 BLU-14 BLU-14 CONTROL P C BOARD J20-1 VIO J20-3 WHI/VIO J21-1 YEL J21-3 WHI/YEL TAN TAN TR1 TR2 J17-1 J17-5 J17-10 J17-14 J15-1 J15-5 LEFT FUNNEL SENSOR 1 3 MT2 TRIAC MT1 LIMIT THERMOSTAT BLU-14 BLU-14 RIGHT FUNNEL SENSOR 1 3 SOL SOL RIGHT FUNNEL LOCK BLK GRY WHI SOL J3-1 PNK GRN LEFT DISPENSE RIGHT BYPASS WHI REFILL WHI WHI WHI BRN/BLK BRN/WH
GRN N WHI SCHEMATIC WIRING DIAGRAM ITB BLK L1 BLK-18 BLK-14 LIMIT THERMOSTAT TRIAC BLU-14 BLK-16 TANK HEATER WHI-16 1680W BLK CONTROL P C BOARD TR1 TR2 J17-1 TAN WHI/VIO SOL J17-5 J17-10 J17-14 J15-1 J15-5 SOL DISPENSE WHI WHI/BLU BLK WHI/YEL WHI SOL SOL REFILL WHI RIGHT DILUTION (DUAL DILUTION MODELS ONLY) WHI WHI BRN/BLK BRN/WHI TRANSFORMER 10VA BLK PRIMARY WHI YEL YEL J3-1 WHI BLK J2-1 PNK GRN 1 2 BRN/BLK BRN/WHI WHI BLK PNK LEVEL PROBE 12VAC SOL FUNNEL LOCK TEM
L1 Chassis Ground WHI BLK Earth Ground N L2 RED GRN/YEL SCHEMATIC WIRING DIAGRAM ITCB-DV HV MAIN ON/OFF SWITCH BLK-18 BLK-14 LIMIT THERMOSTAT TRIAC BLU-14 BLK-14 TANK HEATER SELECTOR SWITCH WHI-14 BLU-14 WHI/VIO-14 1680W BLK CONTROL P C BOARD J1-1 J1-2 TR1 TR2 J17-1 VIO RED-14 2268W FUNNEL SENSOR 1 3 WHI/VIO TAN WHI/RED WHI/RED WHI/GRN J17-5 TANK HEATER WHI/GRN SOL DISPENSE BYPASS SOL WHI REFILL WHI/BLU WHI/BLU SOL WHI WHI BLK J17-10 J17-14 J15-1 J15-5 WHI WHI BRN/BL
RED BLK SCHEMATIC WIRING DIAGRAM ITBA-DUAL DILUTION/SWEETENER BLK RED EMI FILTER Chassis Ground BLK-18 BLK-14 LIMIT THERMOSTAT TRIAC BLU-14 BLK-16 TANK HEATER N L1 GRN/YEL RED-16 BLK CONTROL P C BOARD TR1 TR2 J17-1 TAN WHI/VIO SOL J17-5 J17-10 J17-14 J15-1 J15-5 RED LEFT DILUTION WHI/GRN DISPENSE SOL RED WHI/BLU SOL BLK WHI/YEL RED SOL RIGHT DILUTION WHI BLK J3-1 PNK GRN BRN/BLK BRN/WHI SOL FUNNEL LOCK TRANSFORMER 10VA YEL YEL J3-1 RED RED RED BRN/BLK BRN/WHI B
N WHI L2 RED GRN BLK L1 SCHEMATIC WIRING DIAGRAM ICB SH MAIN ON/OFF SWITCH WHI/VIO MT2 TRIAC LIMIT THERMOSTAT BLU-14 BLU-14 MT1 TANK HEATER RED-14 BYPASS CONTROL P C BOARD J21-3 TR1 TR2 J17-1 WHI SOL J21-1 TAN DISPENSE WHI/RED WHI SOL WHI/GRN J17-5 RED J20-3 FUNNEL SENSOR 1 3 RED VIO BLK J20-1 BLK BLK-18 BLK-14 SOL WHI/BLU REFILL WHI BLK J17-10 J17-14 J15-1 J15-5 WHI WHI BRN/BLK BRN/WHI TRANSFORMER 10VA BLK PRIMARY WHI YEL YEL J13-1 WHI BLK J3-1 PNK GRN J3-5 F
SCHEMATIC WIRING DIAGRAM ICBA SH GRN/YEL L2 BLU BRN L1 Chassis Ground TRIAC MT2 J21-1 CONTROL P C BOARD J21-3 TR1 TR2 J17-1 BLU-14 MT1 LIMIT THERMOSTAT BLU -14 THERMAL FUSE BYPASS GATE WHI/RED DISPENSE RED SOL WHI/BLU RED -14 RED SOL TAN WHI/GRN J17-5 THERMAL FUSE TANK HEATER BLK WHI/VIO RED J20-3 BLK-18 BLK-14 FUNNEL SENSOR 1 3 BLK VIO EMI FILTER Chassis Ground RED J20-1 BLU GRN/YEL BRN MAIN ON/OFF SWITCH SOL REFILL RED BLK J17-10 J17-14 J15-1 J15-5 RED RED
N L2 WHI BLK GRN RED L1 SCHEMATIC WIRING DIAGRAM ICB SH DV BLK-18 BLK-14 SELECTOR SWITCH J20-3 WHI/VIO BLK-14 FUNNEL SENSOR 1 3 J17-1 WHI TANK HEATER RED-14 2268W LIMIT THERMOSTAT TRIAC BLK-14 MT1 MT2 TAN BLK-14 GATE BYPASS WHI/RED WHI SOL WHI/GRN J17-5 DISPENSE WHI/BLU SOL BLK J17-10 J17-14 J15-1 J15-5 WHI SOL REFILL WHI WHI BRN/BLK BRN/WHI TRANSFORMER 10VA BLK PRIMARY WHI YEL YEL J13-1 WHI BLK J3-1 PNK GRN J3-5 WHI FUNNEL LOCK (Optional) SOL WHI BLK PNK LEVEL P
