Bunn CDS-2, CDS-3 service manual Potentiometer

Page 27

SERVICE (cont.)

POTENTIOMETER

P1931

FIG. 24 POTENTIOMETER

Location:

The potentiometer is located under the hopper support panel mounted to the left of the whipper motor and mounted on a bracket. Adjustments can be made by removing the 0.50" plug located on the whipper motor mounting panel.

Test Procedures:

1.Disconnect the dispenser from the power source.

2.Remove the six #8-32 screws securing the rear cover to the dispenser housing.

3.Disconnect the three pin connector (J3) from the control board.

4.Check the resistance between pins 1 & 3 of the potentiometer connector using an ohmmeter. The indication must be between 800 and 1200 ohms.

If the resistance measures as described, proceed to #5. If resistance does not measure as described, replace the potentiometer assembly.

5.Adjust the potentiometer fully clockwise.

6.Check resistance between pins 2 & 3 of the poten- tiometer connector with an ohmmeter. The indica- tion must be between 800 and 1200 ohms. Check the resistance between pins 1 & 2 of the potentiom- eter connector with an ohmmeter. The indication must be less than 20 ohms.

If the resistance measures as described, proceed to #7. If resistance does not measure as described, replace the potentiometer assembly.

7.Adjust the potentiometer fully counterclockwise.

8.Check resistance between pins 1 & 2 of the poten- tiometer connector with an ohmmeter. The indica- tion must be between 800 and 1200 ohms. Check the resistance between pins 2 & 3 of the potentiom- eter connector with an ohmmeter. The indication must be less than 20 ohms.

If the resistance measures as described, the potentiom- eter is operating properly.

If resistance does not measure as described, replace the potentiometer assembly.

Removal and Replacement:

1.Disconnect the dispenser from the power source.

2.Remove the six #8-32 screws securing the rear panel to the dispenser.

3.Disconnect the three pin connector (J3) from the control board.

4.Open the dispenser door and remove the #8-32 screw securing the potentiometer mounting bracket to the whipper motor mounting panel.

5.Remove the potentiometer and mounting bracket as an assembly.

6.Remove the facenut and locking washer securing the potentiometer to the bracket.

7.Install the new potentiometer to the mounting bracket using the locking washer and facenut.

8.Install the potentiometer and bracket assembly to the whipper motor panel and secure with #8-32 screw.

9.Connect the three pin connector (J3) to the control board.

10.Install the rear panel to the housing and secure with six #8-32 screws.

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29793 061599

 

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Contents Phone 217 529-6601 FAX 217 Post Office BOX SPRINGFIELD, IllinoisBUNN-O-MATIC Commercial Product Warranty IntroductionInitial SET-UP User Notices Operating Instructions Adjustments Thorough cleaning of the hopper once a week CleaningRecommended Daily Cleaning and Maintenance Tips Removing and cleaning the whipper chamber once a dayDoor not closed Fault ListNormal operation Powder Auto-Fill ready to DispenseProblem Probable Cause TroubleshootingCDS product tastes watery or sugary TroubleshootingProblem RemedyProblem Probable Cause Remedy Product overflows CDS hopper Control Board and Probe Procedures. SeeImproper adjustment of product Install a regulator if necessary toService Component AccessContents Spacer Dust Seal Hopper Base Auger Drive ComponentsHopper Lid Retainer ClipAuger Drive Motor Diagrams and check wiring harnessMixing Chamber Frother and MIXING/WHIPPER ChamberVolts ac for 120 volt models Volts ac for 230 volt CE models Whipper MotorWhipper Motor Install dispense tip into the bottom of the whipper chamberControl Board and Level Probe If voltage is present as described, proceed to #5If voltage is present as described, proceed to #9 Test Procedure Low Product Detect Remove the control board Instal the new control board using the four #6-32 keps nutsTEST/SERVICE Switch Disconnect the wires from the switch terminalsLocation Main Power ON/OFF Switch Main Power ON/OFF SwitchRefer to when reconnecting the wires Lamp Cord AssemblyLamp Cord Connector Disconnect the lamp cord from the lamp cord connectorRemove new nut and washer from new lamp cord connector Close the dispenser door Lamp HOLDER/SOCKET AssemblyTransformer TransformerPotentiometer PotentiometerHopper Level Indicator Hopper Level IndicatorHopper Switch Hopper SwitchDoor Switch Door SwitchPressure Regulator and Needle Valve AdjustmentsDispense Solenoid Valve Location Dispense Solenoid ValveSchematic Wiring Diagram PAF Wiring DiagramsSchematic Wiring Diagram Pafa
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CDS-2, CDS-3 specifications

The Bunn CDS-3 is a commercial coffee brewer renowned for its reliability, efficiency, and high-quality performance. Designed for busy environments such as cafés, restaurants, and convenience stores, it offers the perfect balance of capacity and functionality, making it ideal for high-demand situations.

One of the standout features of the Bunn CDS-3 is its ability to brew up to 3.8 gallons of coffee per hour. This impressive capacity meets the needs of busy establishments where a constant supply of fresh coffee is crucial. The brewer’s stainless steel construction not only ensures durability but also maintains temperature, thus preserving the coffee’s rich flavor and aroma.

The CDS-3 incorporates Bunn's patented brewing technology, including the "Pour-Over" method. This feature allows for easy operation and contributes to the even extraction of coffee grounds. The machine is equipped with a pre-infusion mode that saturates coffee grounds before brewing, enhancing extraction for a fuller, more complex flavor profile.

Temperature control is another vital characteristic of the Bunn CDS-3. It maintains the water temperature between 195°F to 205°F, the ideal range for optimal coffee brewing. The brewer’s internals are designed for rapid heating, ensuring that the water reaches the desired temperature quickly and consistently, which is essential for high-quality coffee production.

In terms of usability, the Bunn CDS-3 offers an intuitive interface, allowing staff to operate it with minimal training. The front-access design not only simplifies maintenance, but also makes it easy to refill water and perform routine cleaning. Furthermore, the large capacity coffee pots ensure that the brewed coffee can be stored efficiently, minimizing waste.

Equipped with a unique spray head system, the Bunn CDS-3 ensures uniform saturation of the coffee grounds. This feature supports optimal extraction, allowing users to produce a rich and flavorful brew that keeps customers coming back for more.

In summary, the Bunn CDS-3 is a well-engineered, commercial-grade coffee brewer that excels in high-demand environments. Its robust construction, advanced brewing technology, consistent temperature control, and user-friendly design make it a favorite among coffee enthusiasts and professionals alike, affirming its reputation as a reliable and effective solution for coffee brewing needs. Whether for a bustling café or a catering service, the Bunn CDS-3 delivers a consistently great cup of coffee every time.
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