Manuals / Bunn / Kitchen Appliance / Coffeemaker

Bunn ITB/ITCB BREW VALVE EARLY MODELS AND BYPASS VALVE ON ALL ICBs, 1 EARLY BREW VALVE Location

Models: ITB/ITCB ICB/TWIN

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BREW VALVE (EARLY MODELS) AND BYPASS VALVE ON ALL ICB's

BREW VALVE (EARLY MODELS) AND BYPASS VALVE ON ALL ICB's

FIG. 13-1 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

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.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. 13-2 EXPLODED VIEW

Due to the internally rectiﬁed coil, do not attempt to test this type of coil with an ohm- meter. The reading will be open or very high resistance, depending on the polarity of your meter leads.

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Bunn ITB/ITCB, ICB/TWIN BREW VALVE EARLY MODELS AND BYPASS VALVE ON ALL ICBs, 1 EARLY BREW VALVE Location, 2 EXPLODED VIEW

Contents

ITB/ITCB ICB/TWIN SERVICE & REPAIR MANUALInfusion Series BUNN-O-MATIC CORPORATIONBUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY INTRODUCTION CONTENTSExercise extreme caution when servicing electrical equipment TROUBLESHOOTINGFollow recommended service procedures Replace all protective shields or safety noticesPROBABLE CAUSE TROUBLESHOOTING cont REFILL CIRCUIT PROBLEMREMEDY Remove Level Probe and checkPROBLEM TROUBLESHOOTING cont HEATING CIRCUITLime build up on temperature Inspect probe and tank assemblyPROBLEM TROUBLESHOOTING cont BREWING CIRCUITdisable the brew lockout feature NOTE Volume adjustments must beBREWING CIRCUIT cont TROUBLESHOOTING contPROBLEM PROBABLE CAUSEMESSAGE DIAGNOSTICSPROBABLE CAUSE REMEDYFIG. 10-1 ICB COMPONENT ACCESS COMPONENT ACCESSFIG. 10-2 ITB/ITCB COMPONENT ACCESS FIG. 10-3 ICB TWIN COMPONENT ACCESSCheck for Power to board Test ProceduresRemoval and Replacement Faceplate Removal and ReplacementFIG. 12-1 MEMBRANE SWITCH Location MEMBRANE SWITCHFIG. 12-2 MEMBRANE SWITCH CONTINUITY Test ProceduresFIG. 13-1 EARLY BREW VALVE Location BREW VALVE EARLY MODELS AND BYPASS VALVE ON ALL ICBsIf no sound is heard as described, proceed to #4 FIG. 13-2 EXPLODED VIEWFIG. 14-2 LATE MODEL BREW VALVE BREW VALVE LATE MODELS FIG. 14-1 LATE MODEL BREW VALVE LocationTest Procedures Removal and ReplacementREFILL VALVES FIG. 15-1 REFILL VALVES Location DisassemblyIf voltage is present, proceed to # If the sound is not heard as described, pro- ceed to #EARLY ICB REFILL VALVESEARLY ITCB CURRENT ICB & & ITBFIG. 17-1 ICB TWIN TANK HEATERS Location TANK HEATERSFIG. 17-2 DV TANK HEATERS Test ProceduresFIG. 18-1 LIMIT THERMOSTAT LIMIT THERMOSTATLocation The limit thermostat is located on the tank lid on theFIG. 19-2 TEMPERATURE PROBE FIG. 19-3 TESTING TEMPERATURE PROBE TEMPERATURE PROBE FIG. 19-1 TEMPERATURE PROBE LocationRemoval and Replacement CONTINUED Test ProceduresCalibration TEMPERATURE PROBE Removal and ReplacementFIG. 20-1 CALIBRATE TEMP PROBE FIG. 20-2 CALIBRATIONTest Procedure VOLTAGE SELECTOR SWITCH FIG. 21-1 VOLTAGE SELECTOR SWITCH LocationFIG. 21-2 VOLTAGE SELECTOR SWITCH TERMINALS Removal and ReplacementFIG. 22-2 ROCKER SWITCH POWER SWITCH FIG. 22-1 POWER SWITCH ICB SHOWN LocationTest Procedure Removal and Replacement200V AC 2 WIRE SCHEMATIC WIRING DIAGRAM iTCBA, iTCBB230V AC 2 WIRE SINGLE PHASEITCB-DV & ITCB-C-DV SCHEMATIC WIRING DIAGRAM120V AC 2 WIRE 120/208V AC 3 WIRESCHEMATIC WIRING DIAGRAM WITH FACTORY SWEETENER120V AC 2 WIRE 120/208V AC 3 WIRE 120/240V AC 3 WIRE SINGLE PHASE ITCB-DV & ITCB-C-DV120V AC 2 WIRE 120/208V AC 3 WIRE 120/240V AC 3 WIRE SINGLE PHASE SCHEMATIC WIRING DIAGRAM ICB-DV3 WIRE + GND SCHEMATIC WIRING DIAGRAM ICB TWINSINGLE PHASE 120/208 OR 120/240200V AC 2 WIRE 230V AC 2 WIRE SINGLE PHASE SCHEMATIC WIRING DIAGRAM iCBA, iCBB2 WIRE + GND SINGLE PHASE SCHEMATIC WIRING DIAGRAM ICB TWIN 230V Chassis Ground TERM230 VOLTS AC 120V AC 2 WIRE + GROUND SINGLE PHASE SCHEMATIC WIRING DIAGRAM ITBSINGLE & DUAL DILUTION MODELS AND MODELS w/OPTIONAL SWEETENER