Bunn CDBC, CEZF service manual Troubleshooting Heating Circuit, Problem Probable Cause Remedy

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TROUBLESHOOTING (cont.)

HEATING CIRCUIT (cont.)

PROBLEM

 

 

PROBABLE CAUSE

 

 

REMEDY

Water does not heat to proper

4a. Temperature Probe (CDBC-APS/

A) Remove the probe from the grom-

temperature (cont.)

TC/TS/TSR)

met and submerge in a water bath

 

 

 

 

 

of approximately 70°F(21°C). Con-

IMPORTANT: Make sure no tem-

 

 

 

nect an ohmmeter to pins 3 and 4 of

perature tests are taken before the

 

 

 

the J3 connector. At 60°F(16°C)

ready light is "ON". Tank tempera-

 

 

 

the reading should be 15.3k ± 2k

ture must be stabilized before read-

 

 

 

OHMS, at 70°F(21°C) the reading

ings are taken.

 

 

 

should be 11.8k ± 2k OHMS, and at

 

 

 

 

 

80°F(27°C) the reading should be

 

 

 

 

 

9.3k ± 2k OHMS. If the probe is

 

 

 

 

 

within these parameters, reconnect

 

 

4b. Temperature Probe (CEZ-APS/

the J3 plug to the control board.

 

 

 

 

 

 

TS/TSR)

B) Remove the probe from the grom-

 

 

 

 

 

met and submerge in a water bath

 

 

 

 

 

of approximately 70°F(21°C). Con-

 

 

 

 

 

nect an ohmmeter to pins 2 and 3 of

 

 

 

 

 

the J5 connector. At 60°F(16°C)

 

 

 

 

 

the reading should be 15.3k ± 2k

 

 

 

 

 

OHMS, at 70°F(21°C) the reading

 

 

 

 

 

should be 11.8k ± 2k OHMS, and at

 

 

 

 

 

80°F(27°C) the reading should be

 

 

 

 

 

9.3k ± 2k OHMS. If the probe is

 

 

 

 

 

within these parameters, reconnect

 

 

 

 

 

the J5 plug to the control board.

 

 

5. Limit Thermostat (CDBC-APS/

Disconnect the brewer from the

 

 

TC/TS/TSR & CEZ-APS/TS/TSR)

power source. Check for continuity

 

 

 

 

 

across the limit thermostat termi-

 

 

 

 

 

nals. Continuity should be present.

 

 

 

 

 

If not replace the limit thermostat.

 

 

 

 

 

(See page 27)

 

 

6. Tank Heater (CDBC-APS/TC/TS/

Disconnect the brewer from the

 

 

TSR & CEZ-APS/TS/TSR)

power source. Check for continuity

 

 

 

 

 

between the white terminal of the

 

 

 

 

 

terminal block and the black wire on

 

 

 

 

 

the relay on the control board. There

 

 

 

 

 

should be a low OHM reading. If no

 

 

 

 

 

continuity is present, check for a

 

 

 

 

 

wiring problem, then replace the

 

 

 

 

 

tank heater if no wiring problem is

 

 

 

 

 

found. (See page 28)

Spitting or excessive steaming

1. Lime build up on temperature

 

probe, tank or tank heater

Inspect probe and tank assembly for excessive lime deposits. Delime as required.

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Contents Post Office BOX SPRINGFIELD, Illinois Phone 217 FAX 217Contents IntroductionUser Notices Electrical Hook-Up Electrical RequirementsPlumbing Requirements Ready Indicator ON/OFF SwitchBrew Switch Operating ControlsCoffee Brewing CleaningInitial SET-UP CEZ-APS/TS/TSR Adjustments & Optional Settings Adjusting Brew VolumesDisplaying Brew Temperature CDBC-APS/TC/TS/TSR Adjustments & Optional SettingsSetting Brew Temperature Setting Brew LockoutWater Sensing Threshold Adjustment Procedure CDBC-APS/TC/TS/TSR Adjustments & Optional SettingsTroubleshooting Before troubleshooting this brewer, check for the followingProbable Cause TroubleshootingRefill Circuit Problem RemedyTroubleshooting Refill Circuit 2a. Water Level Probe Sensing System CDBC-APS/TS/TSRWater not touching temperature probe Heating Circuit Problem Probable Cause RemedyWater does not heat to proper temperature Troubleshooting Heating Circuit Problem Probable Cause RemedyReplace the control board.See ContControl Board Cdbc & CEZ Pages 21Brewing Circuit Problem Probable Cause Troubleshooting Brewing Circuit Dripping from sprayhead Lime build up Water temperatureSet-upinstructions RequiredFunnel loading Problem Probable CauseDry coffee grounds remain Sprayhead Funnel Diagnostics Cause Things to CheckContents ServiceComponent Access Service Control BoardService Control Board Model CEZ-APS/TS/TSR Control BoardService Switch Panel Model CDBC-APS/TC/TS/TSR Switch PanelON/OFF Switch Wiring Service Brew Switch Start Model CEZ-APS/TS/TSR Brew Switch WiringDispense Valve Dispense ValveLimit Thermostat Limit ThermostatTank Heater Tank HeaterService Tank Heater Tank Heater WiringRefill Valve Check for continuity across the refill valve coil terminals120V AC 2 Wire 120/208V AC 3 Wire 120/240V AC 3 Wire Levelsingle PhaseSchematic Wiring Diagram CEZ-APS/TS/TSR 120V AC 2 Wire Cdbc 15, 20 & 35 APS/TC/TS

CEZF, CDBC specifications

The Bunn CEZF and CDBC are two popular commercial coffee brewers offered by Bunn, a leader in the coffee equipment industry. Both models are designed to meet the demands of high-traffic settings such as cafes, restaurants, and other foodservice establishments. They combine advanced technology with user-friendly features to ensure consistent, high-quality coffee with minimal effort.

The Bunn CEZF model is known for its easy-to-use design and efficiency. One of its standout features is the "Digital Brewer" control, which allows operators to adjust brewing parameters such as brew time and water temperature. This level of customization enables baristas to consistently create the perfect cup of coffee tailored to their specific blends. Furthermore, the CEZF has a unique "intelligent" warming plate that maintains the optimal serving temperature without over-extraction, ensuring that each cup of coffee remains flavorful.

On the other hand, the Bunn CDBC incorporates a dual brewing capacity that allows for larger batches of coffee to be made simultaneously. This feature is particularly beneficial in high-demand environments where quick service is essential. The CDBC also utilizes a patented brew control technology, enabling users to select their brew strength with just a few button presses. This flexibility is complemented by its high-performance heating element, which heats water rapidly, ensuring that coffee is brewed at the ideal temperature for optimal extraction.

Both models are equipped with a large water reservoir, ensuring a continuous supply of hot water for brewing. They also feature high-quality stainless steel constructions that enhance durability and make cleaning easier. The intuitive interface on both models simplifies operation, with clear instructions that allow even novice users to brew exceptional coffee right away.

In terms of safety, both the CEZF and CDBC are designed with auto shut-off features and integrated safety protocols, minimizing the risk of overheating and ensuring a secure brewing environment.

Overall, the Bunn CEZF and CDBC are excellent choices for any commercial kitchen or café looking to serve high-quality coffee efficiently. Their advanced features, durability, and ease of use make them top contenders in the commercial brewing category.
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