SERVICE (cont.)

If continuity is not present as described, replace the

BREW SOLENOID VALVE

solenoid valve.

 

 

 

6.

Check the solenoid valve for coil action. Connect

 

 

 

 

the brewer to the power source. With ON/OFF

 

 

 

 

switch in the "ON" upper position press start switch

 

 

 

 

and listen carefully in the vicinity of the solenoid

 

 

 

 

valve for a "clicking" sound

as the coil magnet

 

 

 

 

attracts.

 

 

 

 

 

7.

Disconnect the brewer from the power source.

 

 

 

If the sound is heard as described and water will not

 

 

 

pass through the solenoid valve, there may be a block-

 

 

 

age in the water line before the solenoid valve or, the

 

 

 

solenoid valve may require inspection for wear, and

 

 

 

removal of waterborne particles.

 

 

 

 

If the sound is not heard as described, replace the

 

 

 

solenoid valve.

 

 

 

FIG. 2 BREW SOLENOID VALVE

P1277.40

Removal and Replacement:

 

 

 

1.

Remove all wires from solenoid valves.

 

 

Location:

 

2.

Turn off the water supply to the brewer.

 

Viewing the brewer from the rear the brew sole-

3.

Disconnect the water lines to and from the sole-

noid valve is mounted on the left side of the mounting

 

noid valves.

 

 

bracket.

 

4.

Remove the two #8-32 keps nuts holding the

 

 

 

 

mounting bracket to the brewer base.

Test Procedures:

 

5.

Lift out the bracket.

 

 

1. Disconnect the brewer from the power source.

6.

Remove the two #10-32 slotted-head screws hold-

2. Disconnect the white/violet and white/green wires

 

ing the solenoid valve to the mounting bracket.

 

from the solenoid valve. With the ON/OFF switch

7.

Securely install the new solenoid valve to the

 

in the "ON" upper position press the start switch.

 

mounting bracket.

 

 

3.

With a voltmeter, check the voltage across the

8.

Attach the mounting bracket to the brewer base.

 

white/violet and white/green wires. Connect the

9.

Securely fasten the water lines to and from the

 

brewer to the power source. The indication must

 

solenoid valves.

 

 

 

be:

 

10.

Refer to the Fig.3 when reconnecting the wires

 

a) 120 volts ac for two wire 120 volt models.

 

 

 

 

 

b) 240 volts ac for two wire 240 volt models.

WHI/VIO to Dilution WHI/GRN to

 

 

 

c) 100 volts ac for two wire 100 volt models.

 

 

 

Solenoid

 

 

4. Disconnect the brewer from the power source,

 

Brew Timer TL4

WHI/VIO to Brew Solenoid

 

 

 

 

WHI/VIO to Brew Timer TL1

 

 

 

 

 

If voltage is present as described, proceed to #5

 

 

WHI/BLU to Dilution

If voltage is not present as described, refer to Wiring

 

 

Timer TL4

 

 

 

 

Diagrams and check brewer wiring harness.

 

BREW

 

WHI/VIO to Dilution

 

 

 

 

 

 

 

SOLENOID

 

Solenoid

5. Check for continuity across the solenoid valve coil

DILUTION

BRN/WHI to Selector

terminals.

Switch

 

 

 

SOLENOID

 

 

 

 

 

 

 

If continuity is present as described, reconnect the

 

SWEETENER

 

 

 

white/violet from the ON/OFF switch and white/green

 

SOLENOID (Optional)

 

 

 

 

 

 

P1278

wire from the brew timer.

 

FIG.3 SOLENOID VALVE TERMINALS

 

 

 

 

 

 

 

 

 

 

Page 16

 

 

10225

031804

 

 

 

 

 

Page 15 Page 17
Page 16
Image 16
Bunn TU3 service manual Service, Brew Solenoid Valve, Solenoid valve
Page 15 Page 17

TU3 specifications

The Bunn TU3 is a renowned commercial coffee brewer known for its reliability and performance in bustling coffee shops, restaurants, and diners. Designed to cater to high-demand environments, the TU3 stands out with a variety of features that ensure an optimal brewing experience.

One of the primary characteristics of the Bunn TU3 is its capability to brew large volumes of coffee efficiently. It has a 3-gallon capacity, making it ideal for establishments that serve numerous customers throughout the day. This model can produce up to 19 gallons of coffee per hour, allowing establishments to keep pace with customer demand without sacrificing quality or flavor.

At the heart of the Bunn TU3's performance are its advanced brewing technologies. The brewer features a patented "multi-stream" spray head that evenly distributes hot water over coffee grounds, ensuring optimal extraction for a richer taste. This technology contributes to the consistent flavor profile that customers expect in a quality cup of coffee.

The TU3 is also equipped with a built-in hot water faucet, providing added convenience for brewing tea or instant beverages. Operators can easily access boiling water without interfering with the brewing process, streamlining service during peak hours. The adjustable temperature settings further enhance control over the brewing process, allowing for customization based on the coffee type or personal preference.

In terms of construction, the Bunn TU3 is built to withstand the rigors of commercial use. The brewer boasts a durable stainless steel body that is not only stylish but also easy to clean, helping maintain a professional appearance in any setting. Additionally, the brewer's design incorporates features such as a splash guard and easy-to-use controls, making it user-friendly for staff members.

Energy efficiency is another highlight of the Bunn TU3. Its innovative design helps in reducing energy consumption while still providing rapid brewing capabilities. This feature is particularly appealing to environmentally conscious operators looking to minimize their operational impact.

Overall, the Bunn TU3 coffee brewer combines speed, reliability, and exceptional brewing technology, making it a top choice for businesses that prioritize quality coffee service. Its combination of durability, efficiency, and user-friendly features ensures that it can handle the demands of any high-volume coffee operation, delivering excellent results cup after cup.
Top Page Image Contents