Bunn CDS-3 Control Board and Level Probe, If voltage is present as described, proceed to #5

Page 18

SERVICE (cont.)

CONTROL BOARD and LEVEL PROBE

P1925

FIG. 11 CONTROL BOARD

Location:

The control board is located behind the rear panel, mounted on the back side of the hopper motor mount- ing panel.

Test Procedure:

Liquid Level Control

1.Disconnect the dispenser from the power source.

2.Disconnect the twelve pin connector (J1) from the control board.

3.Check the voltage across pins 2 & 3 of the twelve pin connector on the wiring harness with a voltmeter. Connect the dispenser to the power source and select the "ON" position of the main power switch. The indication must be 24 volts ac.

4.Select the "OFF" position of the main power switch and disconnect the dispenser from the power source.

If voltage is present as described, proceed to #5.

If voltage is not present as described, refer to the wiring diagram and check the dispenser wiring harness.

5.Reconnect the twelve pin connector to the control board (J1).

6.Disconnect the four pin connector (J7) from the control board.

7.Check the voltage across pins 1 & 3 of the four pin connector on the wiring harness with a voltmeter. Connect the dispenser to the power source and select the "ON" position of the main power switch. The indication must be:

a)120 volts ac for 120 volt models.

b)230 volts ac for 230 volt CE models.

8.Select the "OFF" position of the main power switch and disconnect the dispenser from the power source.

If voltage is present as described, proceed to #9.

If voltage is not present as described refer to the wiring diagram and check the dispenser wiring harness.

9.Reconnect the four pin connector to the control board (J7).

10.Disconnect the twelve pin connector (J1) from the control board.

11.Measure the resistance between pins 8 & 12 of the twelve pin connector on the wiring harness using an ohmmeter. The indication must be between 298k ohms and 304k ohms.

If the resistance measures as described, proceed to #12.

If the resistance does not measure as described, refer to the wiring diagram and check the dispenser wiring harness.

12.Carefully connect a piece of insulated jumper wire to the level probe contact pin (pink wire) located at the lower left rear of the dispenser.

13.Check the voltage across the terminals, first of the dispense solenoid and then of the hopper motor with a voltmeter. Connect the dispenser to the power source and select the "ON" position of the main power switch. The indication must be:

a)120 volts ac for 120 volt models.

b)230 volts ac for 230 volt CE models.

at the dispense solenoid and between 4 and 26 volts dc at the hopper motor after a delay of approxi- mately 10 seconds.

14.Touch the free end of the jumper wire to the dispenser housing. The indication must be 0 (zero) after a delay of up to 5 seconds.

15.Move the jumper wire away from the housing. The indication must again be:

a)120 volts ac for 120 volt models.

b)230 volts ac for 230 volt CE models.

at the dispense valve solenoid and between 4 and 26 volts dc at the hopper motor after a delay of up to 5 seconds.

16.Disconnect the dispenser from the power source, remove the jumper wire, and select the "OFF" posi- tion on the main power switch.

If voltage is present as described, The liquid level control circuitry is operating properly.

If voltage is not present as described, replace the control board.

18

29793 011500

 

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Contents Post Office BOX SPRINGFIELD, Illinois Phone 217 529-6601 FAX 217BUNN-O-MATIC Commercial Product Warranty IntroductionInitial SET-UP User Notices Operating Instructions Adjustments Removing and cleaning the whipper chamber once a day CleaningRecommended Daily Cleaning and Maintenance Tips Thorough cleaning of the hopper once a weekDispense Fault ListNormal operation Powder Auto-Fill ready to Door not closedTroubleshooting Problem Probable CauseRemedy TroubleshootingProblem CDS product tastes watery or sugaryProblem Probable Cause Remedy Install a regulator if necessary to Procedures. SeeImproper adjustment of product Product overflows CDS hopper Control Board and ProbeService Component AccessContents Retainer Clip Auger Drive ComponentsHopper Lid Spacer Dust Seal Hopper BaseDiagrams and check wiring harness Auger Drive MotorFrother and MIXING/WHIPPER Chamber Mixing ChamberWhipper Motor Volts ac for 120 volt models Volts ac for 230 volt CE modelsInstall dispense tip into the bottom of the whipper chamber Whipper MotorControl 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 Instal the new control board using the four #6-32 keps nuts Remove the control boardTEST/SERVICE Switch Disconnect the wires from the switch terminalsLocation Main Power ON/OFF Switch Main Power ON/OFF SwitchLamp Cord Assembly Refer to when reconnecting the wiresLamp Cord Connector Disconnect the lamp cord from the lamp cord connectorRemove new nut and washer from new lamp cord connector Lamp HOLDER/SOCKET Assembly Close the dispenser doorTransformer TransformerPotentiometer PotentiometerHopper Level Indicator Hopper Level IndicatorHopper Switch Hopper SwitchDoor Switch Door SwitchAdjustments Pressure Regulator and Needle ValveDispense Solenoid Valve Dispense Solenoid Valve LocationWiring Diagrams Schematic Wiring Diagram PAFSchematic 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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