Bunn CDS-2, CDS-3 service manual Pressure Regulator and Needle Valve, Adjustments

Page 31

SERVICE (cont.)

PRESSURE REGULATOR and NEEDLE VALVE

P1935

FIG. 30 PRESSURE REGULATOR

and NEEDLE VALVE

Location:

The pressure regulator and needle valve are located inside the rear panel at the bottom of the dispenser.

Adjustments:

The water pressure regulator is preset at the factory to produce 15 psi (103 kPa) of water pressure at the regulator outlet with inlet pressures ranging from 20 psi to 90 psi (138 to 620 kPa). No field adjustments of the pressure regulator should ever be necessary.

The needle valve is preset at the factory to dispense 1 fluid ounce of water per second. The dispenser is designed to accommodate various product mix ratios by adjusting the product dispense rate (see Initial Setup). Should a readjustment of the water dispense rate become necessary, proceed as follows:

1.Disconnect the dispenser from the power source.

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

3.Turn the needle valve adjustment screw counter- clockwise to increase the water flow rate, and clockwise to decrease the water flow rate.

Removal and Replacement:

Pressure Regulator

1.Disconnect the dispenser from the power source and the water supply.

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

3.Disconnect the .25" copper tube from the outlet of the pressure regulator.

4.Loosen the nut securing the bulkhead fitting to the dispenser.

5.Remove the bulkhead fitting from the inlet to the pressure regulator.

6.Remove the pressure regulator assembly.

7.Attach the regulator to the bulkhead fitting making sure that the copper bushing is seated properly in the regulator and tighten securely.

8.Tighten the nut securing the bulkhead fitting to the dispenser housing.

9.Attach the .25" copper tube to the regulator assem- bly and tighten securely.

10.Connect the dispenser to the water source and check for leaks. Tighten any leaking connections before installing rear panel.

Removal and Replacement:

Needle Valve

1.Disconnect the dispenser from the power source and the water supply.

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

3.Disconnect the .25" copper tube from the inlet fitting on the needle valve.

4.Disconnect the water outlet from the solenoid valve.

5.Remove the solenoid valve and needle valve as described in section- Dispense Solenoid Valve.

6.Remove the needle valve assembly. Remove the fitting from the inlet port of the needle valve.

7.Install the fitting removed from the old needle valve onto the new needle valve using pipe thread sealant (BOM #M2526.0000).

8.Attach the needle valve to the fitting on the dispense solenoid valve using pipe thread sealant (BOM #M2526.0000) and tighten securely.

9.Install the solenoid valve and needle valve as de- scribed in section- Dispense Solenoid Valve.

10.Attach water inlet and outlet lines and tighten se- curely.

11.Connect the dispenser to the water source and check for leaks. Tighten any leaking connections before installing rear panel.

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29793 011500

 

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Contents Phone 217 529-6601 FAX 217 Post Office BOX SPRINGFIELD, IllinoisIntroduction BUNN-O-MATIC Commercial Product WarrantyInitial 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 toComponent Access ServiceContents 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 chamberIf voltage is present as described, proceed to #5 Control Board and Level ProbeIf 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 nutsDisconnect the wires from the switch terminals TEST/SERVICE SwitchLocation Main Power ON/OFF Switch Main Power ON/OFF SwitchRefer to when reconnecting the wires Lamp Cord AssemblyDisconnect the lamp cord from the lamp cord connector 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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