SERVICE (cont.)

7. Disconnect the dispenser from the power source.

SOLENOIDS

 

FIG. 44 SOLENOIDS

P1342

 

Location:

The solenoids are mounted on a bracket that is attached on top of the chassis on the left side.

Test Procedures:

1.Disconnect the dispenser from the power source.

2.Disconnect the white/black wire from the solenoid to be tested and the orange wire from the left sole- noid, the violet wire from the right solenoid or the white/violet wire from the center solenoid.

3.With a voltmeter, check the voltage across the white/black wire and the other wire with the ON/OFF switch in the “ON” position and the appropriate ICE/OFF/NO-ICE switch in the “ICE” or “NO-ICE” position. Connect the dispenser to the power source. The indication must be:

a)120 volts ac for 120 volt models.

b)230 volts ac for 230 volt models.

4.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 main wiring harness.

5.Check for continuity across the solenoid valve coil terminals.

If continuity is present as described, reconnect the wires to the solenoid.

If continuity is not present as described, replace the solenoids.

6.Check the solenoid valve for coil action. Connect the dispenser to the power source. With the auger motor switch in the “ON” position and the ON/ OFF/ICE switch in the “ICE” or “NO-ICE” position press the ON/OFF switch to the “ON” position. After approximately two minutes listen carefully in the vicinity of the solenoid valve for a “clicking” sound as the coil magnet attracts.

If the sound is heard as described and the refrigerant will not pass through the solenoid valve, there may be a blockage in the refrigerant line before the solenoid valve, or the solenoid valve may require inspection for wear, and removal of particles.

If the sound is not heard as described, replace the solenoids.

Removal and Replacement:

NOTE: Before removal of any refrigeration component the refrigerant in the system must be reclaimed by a licensed refrigeration repair person.

1.Disconnect the wires from both solenoids.

2.Disconnect the refrigerant lines from the solenoids to the cooling drums and the refrigerant line from the accumulator.

3.Remove the #6 hex crimptite securing solenoid bracket to the dispenser chassis.

4.Remove bracket and solenoids from the chassis assembly.

5.Remove the four #8-32 locking screws securing the solenoids to the bracket.

6.Remove solenoid and repair or discard.

7.Install new solenoid on mounting bracket using four #8-32 locking screws.

8.Reinstall mounting bracket and solenoids inside the dispenser chassis, securing with a #6 hex crimptite screw.

9.Reconnect the tubes from the accumulator and the cooling drums.

10.Refer to Fig. 45 and reconnect the wires.

11.Evacuate the system.

12.Recharge the system with the appropriate coolant and to the pressures directed on the decals

NOTE: The charging of the system must be done by a licensed refrigeration repair person.

 

FIG.45 SOLENOID TERMINALS

P1327

 

 

46

 

27646 122200

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Image 46
Bunn CDS-3 service manual Solenoids
Page 45 Page 47

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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