SERVICE (cont.)

DILUTION SOLENOID VALVE(S)

P2207.40

FIG. 10 DILUTION SOLENOID VALVE(S)

Location:

Viewing the brewer from the rear the dilution so- lenoid for the T3 is mounted on the center of the sole- noid mounting bracket, the T6 solenoids are mounted in the center and the right side of the mounting bracket.

Test Procedure:

1.Disconnect the brewer from the power source.

2.T3 - With a voltmeter, check the voltage across the white/blue and white/violet wires on the dilu- tion solenoid terminals when the ON/OFF switch is in the “ON” (left) position and the start switch is momentarily placed in the lower position. Con- nect the brewer to the power source. After the approximate setting on the delay dial, the indica- tion must be:

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

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

c)100 volts ac for two wire 100 volt models, re- main for the approximate setting on the dilution dial, and then return to its previous indication.

T6 - With a voltmeter, check the voltage across the white/blue and yellow wires on the dilution so- lenoid terminals for the right reservoir and the white/blue and the brown/black for the left reser- voir when the SELECTOR switch is in the “ON” (left for the left reservoir or right for the right res- ervoir) position and the start switch is momen- tarily placed in the lower position. Connect the brewer to the power source. After the approxi- mate setting on the delay dial, the indication must be:

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

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

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

main for the approximate setting on the dilution dial, then return to its previous indication.

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

If voltage is not present as described, refer to the Wir- ing Diagrams and check the wiring harness.

4.Remove both wires from the coil and check for continuity across the coil terminals.

If continuity is present as described, reconnect the white/blue and white/violet wires and proceed to #5. If continuity is not present as described, replace the solenoid valve.

5.Check the solenoid valve for coil action. Connect the brewer to the power source, place the ON/OFF or SELECTOR switch in the “ON” (T3 left, T6 left or right) position and momentarily place the start switch in the lower position and release. Listen carefully after the approximate setting on the de- lay dial in the vicinity of the solenoid valve for a “clicking” 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 water will not pass through the solenoid valve, there may be a block- age in the water line before or after 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.

Removal and Replacement:

1.Remove all wires from the solenoid valves.

2.Turn off the water supply to the brewer.

3.Disconnect the water lines to and from the sole- noid valves.

4.Remove the two #8-32 keps nuts holding the mounting bracket to the trunk base.

5.Lift out the bracket.

6.Remove the two #10-32 slotted-head screws hold- ing the solenoid valve to the mounting bracket.

7.Securely install the new solenoid valve to the mounting bracket.

8.Attach the mounting bracket to the trunk base.

9.Securely fasten the water lines to and from the solenoid valves.

10.Refer to Fig. 3 when reconnecting the wires.

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Bunn T3A, T6A service manual Dilution Solenoid Valves, Test Procedure Disconnect the brewer from the power source
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T6, T6A, T3A specifications

The Bunn T6A, T3A, T6, and T3 are part of a distinguished line of commercial coffee brewers engineered for consistency, efficiency, and top-notch brew quality. These machines are well-suited for cafes, restaurants, and specialty coffee shops where reliability and performance are paramount.

The Bunn T6A is designed to brew large quantities, accommodating high-demand environments. With a capacity of six gallons per hour, this machine can quickly fulfill orders, ensuring that customers receive fresh, hot coffee without delay. It features a programmable touchpad that allows users to customize brew settings, enabling them to fine-tune extraction times and temperatures for various coffee blends. The T6A’s dual-float system provides precise water control, preventing overflow and enhancing safety.

The Bunn T3A is another exceptional model in this lineup, designed for both versatility and speed. It boasts a three-gallon capacity, making it ideal for medium-sized establishments. The T3A is equipped with Bunn's patented SplashGard funnel, which helps protect users from hot water splashes, providing an additional layer of safety. Its advanced brewing technology allows for an optimal brew temperature range, ensuring that coffee is extracted to perfection every time.

The Bunn T6 is similar to the T6A in its heavy-duty construction but focuses on a slightly different brewing capacity. Capable of producing back-to-back brews, the T6 can keep up with high-volume demands. This model features a digital brewer interface, making it user-friendly while providing detailed feedback on the brewing process. Its robust design allows for easy maintenance, ensuring it remains in peak operating condition.

Lastly, the Bunn T3 serves as a compact alternative in the series, suited for locations with limited space but requiring high-quality coffee. The T3 can brew up to three gallons per hour, seamlessly fitting into smaller setups without compromising on performance. Like its counterparts, it features programmable settings and quick brew times, providing flexibility and efficiency.

Together, the Bunn T6A, T3A, T6, and T3 represent a versatile range of commercial coffee brewing solutions. Each model is designed to deliver exceptional coffee, maintain consistent quality, and provide ease of use, making them integral tools for any serious coffee business. Whether high volume or limited space, Bunn caters to diverse needs while upholding the highest standards in coffee brewing technology.
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