SERVICE (cont.)

5.

Check the solenoid valve for coil action. Connect

SWEETENER SOLENOID VALVE (OPTIONAL)

 

the brewer to the power source, place the ON/OFF

 

 

 

 

 

 

switch in the ÒONÓ position and momentarily place

 

 

 

the start switch in the lower position and release.

 

 

 

Listen carefully after the approximate setting on

 

 

 

the delay dial in the vicinity of the solenoid valve

 

 

 

for a ÒclickingÓ sound as the coil magnet attracts

 

 

 

and after the approximate setting on the dilution

 

 

 

dial, repels the plunger.

 

 

 

 

 

6.

Disconnect the brewer from the power source.

 

 

If the sound is heard as described and sweetener will

 

 

not pass through the solenoid valve, there may be a

 

P1277.40

blockage in the sweetener line before or after the so-

 

FIG. 20 SWEETENER SOLENOID VALVE

lenoid valve or, the solenoid valve may require inspec-

 

tion for wear, and removal of particles.

 

 

 

 

 

 

Location:

If the sound is not heard as described, replace the

 

Viewing the brewer from the rear the sweetener

solenoid valve.

 

 

 

 

solenoid is mounted on the right side of the solenoid

 

 

 

 

 

 

mounting bracket which is secured to the trunk base.

Removal and Replacement:

 

 

 

 

 

1.

Remove all wires from the solenoid valves.

 

 

Test Procedure:

2.

Turn off the sweetener supply to the brewer.

 

 

1. Disconnect the brewer from the power source.

3.

Disconnect the water lines to and from the sole-

2.

With a voltmeter, check the voltage across the

 

noid valves.

 

 

 

 

 

brown/white and white/violet wires on the sweet-

4.

Remove the two #8-32 keps nuts holding the

 

ener solenoid terminals when the ON/OFF switch

 

mounting bracket to the trunk base.

 

 

 

is in the ÒONÓ position and the start switch is mo-

5.

Lift out the bracket.

 

 

 

 

mentarily placed in the lower position. Connect

6.

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

 

the brewer to the power source. After the approxi-

 

ing the solenoid valve to the mounting bracket.

 

mate setting on the delay dial, the indication must

7.

Securely install the new solenoid valve to the

 

be:

 

mounting bracket.

 

 

 

 

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

8.

Attach the mounting bracket to the trunk base.

 

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

9.

Securely fasten the sweetener and water lines to

 

c) 100 volts ac for two wire 100 volt models, re-

 

and from the solenoid valves.

 

 

 

main for the approximate setting on the dilution

10.

Refer to Fig. 21

when reconnecting the wires.

 

dial, and then return to its previous indication.

 

 

 

 

 

 

3.

Disconnect the brewer from the power supply.

WHI/VIO to Dilution WHI/GRN to

 

 

 

 

 

Solenoid

 

 

 

 

 

 

 

Brew Timer TL4

WHI/VIO to Brew Solenoid

 

 

If voltage is present as described, proceed to #4.

 

 

 

 

 

 

 

 

WHI/VIO to Brew Timer TL1

 

 

If voltage is not present as described, refer to the Wir-

 

 

 

WHI/BLU to Dilution

 

 

ing Diagrams and check the wiring harness.

 

 

 

 

 

 

 

 

Timer TL4

 

 

4. Remove both wires from the coil and check for

BREW

 

WHI/VIO to Dilution

 

 

continuity across the coil terminals. If continuity

SOLENOID

 

Solenoid

 

 

 

is present as described, reconnect the brown/white

 

DILUTION

 

BRN/WHI to Selector

 

 

 

Switch

 

 

 

and white/violet wires and proceed to #5.

 

SOLENOID

 

 

 

 

 

SWEETENER

 

 

 

 

 

 

 

If continuity is not present as described, replace the

 

 

 

 

 

 

SOLENOID (Optional)

 

 

solenoid valve.

 

FIG.21 SOLENOID VALVE TERMINALS

P1278

 

 

 

 

 

 

Page 27

 

 

10225

031804

 

 

 

 

 

 

Page 26 Page 28
Page 27
Image 27
Bunn TU3 service manual Sweetener Solenoid Valve Optional
Page 26 Page 28

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.
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