Bunn ITB/ITCB, ICB/TWIN manual Refill Valves, Disassembly

Page 15

REFILL VALVES

FIG. 15-1 REFILL VALVES

Location:

The refill valve is located inside the front of the brewer.

Test Procedures:

1.Enter programming level 2, scroll to "Service Tools" then scroll to "Refill Valve".

2.Briefly activate the refill 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 Dia- grams and check main wiring harness. If har- ness checks ok, replace control board.

4.Check the refill valve for coil action. Briefly activate the refill valve in the test mode and listen carefully near the refill 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 refill valve, there may be a blockage in the water line before the refill valve or, the solenoid valve may require inspection for wear, and removal of waterborne particles.

If the sound is not heard as described, pro- ceed 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).

If resistance is not present as described, replace the refill valve.

If resistance is present as described, check for debris in the valve.

Removal and Replacement:

1.Remove both wires from the refill 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 refill and operation.

Disassembly:

Bunn does not offer repair/rebuild kits for the refill 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.

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Contents ITB/ITCB ICB/TWIN BUNN-O-MATIC Commercial Product Warranty Introduction Control Boards TroubleshootingRemedy TroubleshootingRefill Circuit Problem Probable CauseHeating Circuit Problem Probable Cause Remedy Brewing Circuit Problem Probable Cause Remedy Problem Probable Cause Remedy Troubleshooting Brewing CircuitMessage Probable Cause Remedy DiagnosticsICB Component Access Component AccessControl Board Membrane Switch Continuity Membrane SwitchExploded View Early Brew ValveLate Model Brew Valve Brew Valve Late ModelsRefill Valves DisassemblyEarly Itcb Refill Valves Early ICBICB Twin Tank Heaters Tank HeatersLimit Thermostats Limit ThermostatTesting Temperature Probe Temperature ProbeCalibrate Temp Probe CalibrationTest Procedure Voltage Selector SwitchTest Procedure Removal and Replacement Power SwitchSchematic Wiring Diagram iTCBA, iTCBB Schematic Wiring Diagram With Factory Sweetener Schematic Wiring Diagram ICB-DV Schematic Wiring Diagram ICB Twin Schematic Wiring Diagram iCBA, iCBB Schematic Wiring Diagram ICB Twin 230V Chassis Ground Term Schematic Wiring Diagram ITB
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