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ITB/ITCB
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
42461.0000A 01/10 ©2010 Bunn-O-Matic Corporation
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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 po
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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 ...............................................................
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TROUBLESHOOTING A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems encountered. If the problem remains after exhausting the troubleshooting steps, contact the Bunn-O-Matic Technical Service Department. � Inspection, testing, and repair of electrical equipment should be performed only by qualifi ed service person- nel. � All electronic components have ac line voltage and some have low voltage dc potential on their terminals. Shorting of te
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TROUBLESHOOTING (cont.) REFILL CIRCUIT PROBABLE CAUSE REMEDY PROBLEM Press ENABLE BREW switch on Will not refi ll 1. Power off to brewer 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 mal- function (See Diagnostic Section in this manual). Make sure ON/OFF Switch is "ON" 4.ON/OFF Switch (If equipped) and indicator is lit. 5. Lime build up on Probe(s) Remove the Level Probe(s) and check for lime deposit on tip
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TROUBLESHOOTING (cont.) HEATING CIRCUIT PROBLEM PROBABLE CAUSE REMEDY Water does not heat to proper 1. Display's error message Brewer has shut down due to mal- temperature function. See Diagnostics. IMPORTANT: Make sure no tem- perature tests are taken before 2. Water not touching main (short) Remove level probe and grommet. the display reads ready. Tank tem- level probe Look into hole on tank lid. Water perature must be stabilized before must be within approximately one readings are taken. i
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TROUBLESHOOTING (cont.) BREWING CIRCUIT PROBLEM PROBABLE CAUSE REMEDY Brew cycle will not start 1. Display's error message Brewer has shut down due to mal- function. See Diagnostics. 2. No water Water lines and valves to the brewer must be open. 3. No power or incorrect voltage to Check for voltage across the termi- the brewer nals at the terminal block. 4. ON/OFF switch not in the "ON" The indicator lamp must be lit position 5. Low water temperature (Brew Allow brewer to heat until ready, or
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TROUBLESHOOTING (cont.) BREWING CIRCUIT (cont.) PROBLEM PROBABLE CAUSE REMEDY Dripping from sprayhead 1. Lime build up Inspect the tank assembly for ex- cessive lime deposits. Delime as required. 2. Dispense valve Check/replace Weak beverage 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 spray- head. Initiate brew cycle and check the water temperature immediately below the sprayhead with a t
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DIAGNOSTICS MESSAGE PROBABLE CAUSE REMEDY Temperature Too Low 1. Water temperature in the tank A) Wait for the brewer to heat to does not meet the ready tempera- the proper temperature. ture. B) Disable the BREW LOCKOUT function. Refer to programming section for procedure. Heating Time Too Long 1. Tank Heater failure. Replace or repair as needed 2. Control Board/Thermistor fail- Replace or repair as needed ure Fill Time Too Long 1. Water shut off to brewer Check water supply shut-off 2. Sup
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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 electri- cal equipment should be performed only by qualifi ed service personnel. The brewer should be unplugged when servicing, except when electrical tests are re- quired and the test procedure specifi cally stat
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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. 7. Re-install connectors. FIG. 11-1 C
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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 con- nector 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 ad
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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 Wir- ing 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. Rem
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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 s
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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. 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 mou
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REFILL VALVES EARLY ICB CURRENT ICB & & ITB Flow control used SCREEN on dual dilution STRAINER models only EARLY ITCB CURRENT ITCB & ITB-DD SCREEN STRAINER 42461 0911809 16
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TANK HEATERS 2268W 1425W Large Small Dia. 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 FIG. 17-1 ICB TWIN TANK HEATERS 3000W-208V 12.9-15.1 3000W-240V 17.9-20.7 Location: 3500W-200V 10.5-12.2 The tank heaters are located inside the tank and secured TERMINAL TO SHEATH - INFINITE (OPEN) to the tank bottom. Test Procedures: NOTE- If an
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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. If continuity is not present
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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 tempera
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TEMPERATURE PROBE Removal and Replacement: 3. Press and hold the "Hidden" button until display reads "CAL TEMPERATURE SENSOR?" "NO/YES" 1. Disconnect the brewer from the power source. 4. Select "YES". The display should show something 2. Disconnect the two pin connector from J9 on similar to the screen below (FIG 20-2). control board. NOTE: Variables such as tank set temperature could 3. Pull temperature probe out of it's grommet. show different numbers than the example shown 4. Install in
