SERVICE (cont.)

If continuity is not present as described, replace the

BREW SOLENOID VALVE (HOT COFFEE)

solenoid valve.

 

 

6.

Check the hot coffee solenoid valve for coil ac-

 

 

 

tion. Connect the brewer to the power source. With

 

 

 

TEA/OFF/COFFEE switch in the "COFFEE" position

 

 

 

press the 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.

 

P2198.50

Removal and Replacement:

 

FIG. 2 HOT COFFEE BREW SOLENOID VALVE

1.

Remove all wires from solenoid valves.

Location:

2.

Turn off the water supply to the brewer.

 

Viewing the brewer from the, rear the hot coffee

3.

Disconnect the water lines to and from the sole-

brew solenoid valve is mounted on the left side of the

 

noid valves.

mounting 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/red and white/green wires

 

ing the hot coffee solenoid valve to the mounting

 

from the hot coffee solenoid valve. With the TEA/

 

bracket.

 

OFF/COFFEE switch in the "COFFEE" position press

7.

Securely install the new hot coffee solenoid valve

 

the START switch.

 

to the mounting bracket.

3.

With a voltmeter, check the voltage across the

8.

Attach the mounting bracket to the brewer base.

 

white/red 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 120 volts ac for two wire 120 volt models and

10.

Refer to Fig. 3 when reconnecting the wires.

 

three wire 120/208 volt models.

 

WHI/GRN to Hot Coffee Timer TL4

4.

Disconnect the brewer from the power source.

 

WHI/RED to Hot Coffee Timer TL1

If voltage is present as described, proceed to #5

If voltage is not present as described, refer to Wiring

Diagrams and check brewer wiring harness.

5. Check for continuity across the hot coffee sole-

HOT COFFEE

 

 

noid valve coil terminals.

BREW SOLENOID

 

 

ICED TEA BREW

 

 

 

 

 

If continuity is present as described, reconnect the

SOLENOID

 

 

 

DILUTION

 

white/red and white/green wires from the hot coffee

 

 

 

SOLENOID

P1364

brew timer.

FIG.3 SOLENOID VALVE TERMINALS

 

Page 15

10510

081599

 

 

Page 14 Page 16
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Image 15
Bunn TWF service manual Service, Brew Solenoid Valve HOT Coffee, Solenoid valve
Page 14 Page 16

TWF specifications

The Bunn TWF series is a versatile and high-performance coffee brewing system designed to meet the demanding needs of commercial coffee establishments. Renowned for its reliability and consistency, the Bunn TWF is engineered for high volume production while maintaining exceptional quality in every cup.

One of the main features of the Bunn TWF is its dual-voltage capability, which makes it adaptable to various electrical systems, ensuring that businesses can use it in different locations with ease. It is compatible with both 120V and 220V outlets, providing flexibility for commercial environments.

The TWF employs Bunn's innovative brewing technology, which includes a patented digital pulse brew feature. This system optimizes the extraction process by controlling the flow rate and brewing time, enhancing the flavor profile of the coffee and ensuring that each batch is rich and full-bodied. The ThermoFresh technology allows for excellent thermal retention, ensuring that the coffee remains hot and fresh for extended periods without a heated plate that can alter the taste.

Another significant characteristic of the Bunn TWF is its brewing capacity. The machine can brew up to 16.3 gallons of coffee per hour, making it an ideal choice for busy cafes, restaurants, and catering services. The large capacity also translates to less downtime, enabling staff to serve customers more efficiently.

The Bunn TWF is equipped with a user-friendly control interface, featuring intuitive buttons and an easy-to-read display. This allows for precise programming and brewing options, accommodating various coffee types and recipes. Users can easily set up their preferred brewing parameters, making it convenient to replicate the same great taste repeatedly.

Moreover, the design of the Bunn TWF emphasizes durability and ease of maintenance. Constructed from high-quality materials, it can withstand the rigors of daily use in a bustling coffee shop environment. The machine is also designed for easy cleaning, with removable components that simplify upkeep and prolong its lifespan.

In conclusion, the Bunn TWF is an exceptional choice for those in the coffee business looking to elevate their brewing game. With its outstanding features, advanced technologies, and user-focused design, it stands out as a leader in commercial coffee brewing solutions. Whether for a high-traffic café or a catering operation, the Bunn TWF is engineered to deliver quality and efficiency while satisfying the most discerning coffee connoisseurs.
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