Bunn TWIN service manual Problem Probable Cause Remedy

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TROUBLESHOOTING (cont.) REFILL CIRCUIT (cont.)

PROBLEM

PROBABLE CAUSE

 

REMEDY

Fill or refill does not shut "OFF" (ON/OFF Switch "OFF")

2a. Water Level Probe Sensing Sys- tem (CDBC)

2b. Water Level Probe Sensing Sys- tem (CEZ)

3.Refill valve or control board (CDBC & CEZ)

4.Water is too conductive for proper operation when using the factory setting of sensing threshold.

1.Refill valve or control board (CDBC & CEZ)

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A)Disconnect the brewer from the power source. Disconnect the J3 connector from the control board. Check for continuity from the nut on top of the level probe to pin 1 of the plug, continuity should be present. Pull the temperature probe up about an inch from the grom- met. Check for continuity from the outside surface of the temperature probe and pin 4 of the plug, conti- nuity should be present. Connect the J3 plug to the control board and proceed to step 3.

B)Disconnect the brewer from the power source. Disconnect the J5 connector from the control board. Check for continuity from the nut on top of the level probe to pin 5 of the plug, continuity should be present. Pull the temperature probe up about an inch from the grom- met. Check for continuity from the outside surface of the temperature probe and pin 2 of the plug, conti- nuity should be present. Connect the J5 plug to the control board and proceed to step 3.

Press ON/OFF switch to "ON" (Indi- cator lamp should be lit). If water continuously flows out of air vent tube, disconnect the brewer from the power source. If water flow stops, replace the control board. If water flow does not stop, repair or replace the refill sol-enoid.(See page 31)

Reset the Water Sensing Threshold Adjustment Procedures on page 9.

If water continuously flows out of air vent tube, disconnect the brewer from the power source. If water flow does not stop, repair or replace the refill solenoid. If the valve closes when power is removed, replace the control board. (See pages 22 & 23)

29319 091203

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Contents CEZ Cdbc Twin Introduction ContentsUser Notices Plumbing Requirements Electrical RequirementsElectrical Hook-Up Brew Switch ON/OFF SwitchAdditional Warmer Switches Ready IndicatorInitial SET-UP CleaningCoffee Brewing CEZ Adjustments & Optional Settings Setting Brew Temperature Cdbc Adjustments & Optional SettingsDisplaying Brew Temperature Setting Brew LockoutAdjusting Brew Volumes Pulse Brew Setup Procedure Cdbc Twin & Cdbcf Twin Before troubleshooting this brewer, check for the following TroubleshootingRefill Circuit Problem TroubleshootingProbable Cause RemedyProblem Probable Cause Remedy Heating Circuit Problem Probable Cause Remedy 3 of the J5 connector. At 4b. Temperature Probe CEZ Remove the probe fromIngs are taken Control board2b. Temperature Probe CEZ Remove the probe from 4 of the J3 connector. AtSet the temperature to 200F Bilize. If temperature in tank isBrew cycle will not start Brewing Circuit ProblemTroubleshooting Brewing Circuit Probable Cause Remedy Supply and check wiring Move the two wires. Check forSwitch Holes are clear and unobCause Things to Check DiagnosticsComponent Access ServiceContents Disconnect the 11-pin connector from the control panel Service PC Control Board Model CdbcControl Boards CEZ Service PC Control Board Model CEZSwitch Panels Cdbc Service Switch Panel Model CdbcService ON/OFF Switches Model CEZ Bottom switch terminal Service Brew Switch Start Model CEZMinals when the switch is released Dispense Valve ServiceLimit Thermostats Limit ThermostatTank Heater Tank HeatersTank Heater Wiring Service Tank HeatersCheck for continuity across the refill valve coil terminals Refill ValveWarmer Elements Warmer ElementsSchematic Wiring Diagram CEZ Twin 0/6 Left Schematic Diagramwiring Twincdbc Schematic Wiring Diagram Cdbc Twin 2/2 Right
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TWIN specifications

The Bunn TWIN,ITB is a remarkable coffee brewing system designed for commercial use, aimed at establishments that require a high volume of coffee while maintaining superior quality. This innovative brewer stands out through its dual brewing capability, allowing users to brew two different types of coffee simultaneously. This feature is particularly beneficial for cafes, restaurants, and other food service locations where diverse customer preferences must be met efficiently.

One of the main features of the Bunn TWIN,ITB is its advanced brewing technology. The system utilizes Bunn's patented brewing process, ensuring optimal coffee extraction and flavor profile every time. It employs a digitally controlled brew timer and state-of-the-art heating elements, providing precise temperature control essential for achieving the ideal brew. This technology allows for consistent results, ensuring that each cup meets the high standards expected in a commercial setting.

The design of the TWIN,ITB is user-friendly and intuitive. It includes an easy-to-read LED display that simplifies programming and monitoring of the brewing process. This streamlined interface enables baristas to adjust settings quickly and efficiently, significantly reducing wait times for customers. Additionally, the unit's low-profile design enables it to fit seamlessly into various kitchen layouts and countertops, optimizing valuable space.

Durability and reliability are at the forefront of the Bunn TWIN,ITB's construction. Built with high-quality materials, the brewer is designed to withstand the rigors of intense daily use. Its stainless-steel finish not only provides a sleek and professional appearance but also makes it easy to clean and maintain, ensuring longevity and excellent performance throughout its lifespan.

Furthermore, the TWIN,ITB features an impressive water capacity with a built-in hot water tank. This allows users to brew large batches of coffee without interruption and offers instant hot water for tea, soups, or other hot beverages. The efficient brewing system utilizes pre-infusion technology, which saturates the coffee grounds before extraction, enhancing the overall flavor and aroma of the brewed coffee.

In summary, the Bunn TWIN,ITB is an exceptional choice for any commercial establishment looking to provide high-quality coffee efficiently. Its dual brewing capabilities, advanced technologies, user-friendly design, durability, and additional features make it a valuable addition to any coffee service operation. Whether busy mornings or afternoon rushes, this brewer ensures that every cup of coffee meets the high standards of taste and quality that customers expect.
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