Manuals / Bunn / Kitchen Appliance / Coffeemaker

Bunn ICB/TWIN BREW VALVE LATE MODELS -1 LATE MODEL BREW VALVE Location, 2 LATE MODEL BREW VALVE

Models: ITB/ITCB ICB/TWIN

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BREW VALVE (LATE MODELS)

BREW VALVE (LATE MODELS)

FIG. 14-1 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. Dis- connect 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

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. 14-2 LATE MODEL BREW VALVE

Due to the internally rectiﬁed 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.

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Bunn ICB/TWIN, ITB/ITCB BREW VALVE LATE MODELS -1 LATE MODEL BREW VALVE Location, 2 LATE MODEL BREW VALVE, Test Procedures

Contents

Infusion Series SERVICE & REPAIR MANUALITB/ITCB ICB/TWIN BUNN-O-MATIC CORPORATIONBUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY CONTENTS INTRODUCTIONFollow recommended service procedures TROUBLESHOOTINGExercise extreme caution when servicing electrical equipment Replace all protective shields or safety noticesREMEDY TROUBLESHOOTING cont REFILL CIRCUIT PROBLEMPROBABLE CAUSE Remove Level Probe and checkInspect probe and tank assembly TROUBLESHOOTING cont HEATING CIRCUITPROBLEM Remove the tank lid and clean indisable the brew lockout feature TROUBLESHOOTING cont BREWING CIRCUITPROBLEM NOTE Volume adjustments must bePROBLEM TROUBLESHOOTING contBREWING CIRCUIT cont PROBABLE CAUSEPROBABLE CAUSE DIAGNOSTICSMESSAGE REMEDYFIG. 10-2 ITB/ITCB COMPONENT ACCESS COMPONENT ACCESSFIG. 10-1 ICB COMPONENT ACCESS FIG. 10-3 ICB TWIN COMPONENT ACCESSRemoval and Replacement Test ProceduresCheck for Power to board Faceplate Removal and ReplacementFIG. 12-2 MEMBRANE SWITCH CONTINUITY MEMBRANE SWITCHFIG. 12-1 MEMBRANE SWITCH Location Test ProceduresIf no sound is heard as described, proceed to #4 BREW VALVE EARLY MODELS AND BYPASS VALVE ON ALL ICBsFIG. 13-1 EARLY BREW VALVE Location FIG. 13-2 EXPLODED VIEWTest Procedures BREW VALVE LATE MODELS FIG. 14-1 LATE MODEL BREW VALVE LocationFIG. 14-2 LATE MODEL BREW VALVE Removal and ReplacementIf voltage is present, proceed to # DisassemblyREFILL VALVES FIG. 15-1 REFILL VALVES Location If the sound is not heard as described, pro- ceed to #EARLY ITCB REFILL VALVESEARLY ICB CURRENT ICB & & ITBFIG. 17-2 DV TANK HEATERS TANK HEATERSFIG. 17-1 ICB TWIN TANK HEATERS Location Test ProceduresLocation LIMIT THERMOSTATFIG. 18-1 LIMIT THERMOSTAT The limit thermostat is located on the tank lid on theTEMPERATURE PROBE FIG. 19-1 TEMPERATURE PROBE Location FIG. 19-2 TEMPERATURE PROBE FIG. 19-3 TESTING TEMPERATURE PROBERemoval and Replacement CONTINUED Test ProceduresFIG. 20-1 CALIBRATE TEMP PROBE TEMPERATURE PROBE Removal and ReplacementCalibration FIG. 20-2 CALIBRATIONFIG. 21-2 VOLTAGE SELECTOR SWITCH TERMINALS VOLTAGE SELECTOR SWITCH FIG. 21-1 VOLTAGE SELECTOR SWITCH LocationTest Procedure Removal and ReplacementTest Procedure POWER SWITCH FIG. 22-1 POWER SWITCH ICB SHOWN LocationFIG. 22-2 ROCKER SWITCH Removal and Replacement230V AC 2 WIRE SCHEMATIC WIRING DIAGRAM iTCBA, iTCBB200V AC 2 WIRE SINGLE PHASE120V AC 2 WIRE SCHEMATIC WIRING DIAGRAMITCB-DV & ITCB-C-DV 120/208V AC 3 WIRE120V AC 2 WIRE 120/208V AC 3 WIRE 120/240V AC 3 WIRE SINGLE PHASE WITH FACTORY SWEETENERSCHEMATIC WIRING DIAGRAM ITCB-DV & ITCB-C-DVSCHEMATIC WIRING DIAGRAM ICB-DV 120V AC 2 WIRE 120/208V AC 3 WIRE 120/240V AC 3 WIRE SINGLE PHASESINGLE PHASE SCHEMATIC WIRING DIAGRAM ICB TWIN3 WIRE + GND 120/208 OR 120/240SCHEMATIC WIRING DIAGRAM iCBA, iCBB 200V AC 2 WIRE 230V AC 2 WIRE SINGLE PHASE230 VOLTS AC SCHEMATIC WIRING DIAGRAM ICB TWIN 230V Chassis Ground TERM2 WIRE + GND SINGLE PHASE SINGLE & DUAL DILUTION MODELS AND MODELS w/OPTIONAL SWEETENER SCHEMATIC WIRING DIAGRAM ITB120V AC 2 WIRE + GROUND SINGLE PHASE