Bunn TB3Q-LP service manual Service, Brew Solenoid Valve, Solenoid valve, Location

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SERVICE (cont.)

If continuity is not present as described, replace the

BREW SOLENOID VALVE

solenoid valve.

P3046

FIG. 2 BREW SOLENOID VALVE

Location:

Viewing the brewer from the top, the brew sole- noid valve is mounted on the right side of the brewer.

Test Procedures:

1.Disconnect the brewer from the power source.

2.Disconnect the white/violet and white/green wires from the solenoid valve. With the ON/OFF switch in the "ON" position ("UNSWEET" or "SWEET" po- sition for brewers with sweetener option), press the start switch.

3.With a voltmeter, check the voltage across the white/violet and white/green wires. Connect the brewer to the power source. The indication must be:

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

b)230 volts ac for two wire 230 volt models.

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

4.Disconnect the brewer from the power source,

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 solenoid valve coil terminals.

If continuity is present as described, reconnect the white/violet from the brew timer and white/green wire from the brew timer.

6.Check the solenoid valve for coil action. Connect the brewer to the power source. With ON/OFF switch in the "ON" position ("UNSWEET" position for brewers with sweetener option), 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.

Removal and Replacement:

1.Remove all wires from solenoid valve.

2.Turn off the water supply to the brewer.

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

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

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 hood.

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

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

WHI/VIO to

Brew Timer TL1

WHI/GRN to

Brew Timer TL4

BREW SOLENOID

P2843

FIG. 3 SOLENOID VALVE TERMINALS

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Contents TB3Q TB3Q-LP Phone 217 529-6601 FAX 217BUNN-O-MATIC Commercial Product Warranty ContentsIntroduction User Notices #37881.0000#06064.0000 #32540.0000Electrical Requirements Plumbing RequirementsProceed as follows Electrical Hook-UpInitial SET-UP Centrate Machines will Yield only 76 OZAuto Sweetener SET-UP Adjusting Brew Volumes Auto Sweetener Cleaning CleaningOperating Controls TEA Brewing Troubleshooting Problem Probable Cause RemedyTroubleshooting ProblemProbable Cause RemedyDrip-out time too long Funnel Tip Ticles clogging the drip-out tipSweetener is not working Sweetener box is empty Sure it is not out of productBrew Timer Dripping from sprayheadSyphon System Lime Build-up Beverage overflows dispenser Brew Solenoid ValveProblem Probable Cause Remedy Service Component AccessService Test Procedures Disconnect the brewer from the power sourceBrew Solenoid Valve Solenoid valveDigital Brew Timer If voltage is as described, proceed to #7Service Digital Brew Timer Digital Timer WiringControl Thermostat Control ThermostatRemove the blue/black wire from the limit ther- mostat Limit ThermostatON/OFF Switch Refer to when reconnecting the wires LocationSwitch terminals On the switch terminalStart Switch Start SwitchUNSWEET/OFF/SWEET Switch Sweetner Option Sweetner Solenoid Valve Sweetner Solenoid ValveTank Heater Volts AC Wire Single Phase Volts ACSchematic Wiring Diagram TB3QA
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TB3Q, TB3Q-LP specifications

The Bunn TB6Q, TB3-LP, TB6, TB3Q, and TB3Q-LP coffee brewers are a popular series of commercial machines designed for high efficiency and optimal performance in busy environments such as cafes, restaurants, and offices. These machines are crafted with a focus on quality, dependability, and advanced brewing technology to deliver a superior coffee experience.

One of the standout features across the Bunn TB series is the ability to brew large quantities of coffee quickly. The TB6Q, for instance, can brew up to 6 gallons of coffee per hour. This high volume brewing capability ensures that establishments can keep up with demand, especially during peak hours. Additionally, the machines come with a unique design that incorporates a pre-infusion feature, allowing for the coffee grounds to be evenly saturated before brewing begins, enhancing the flavor extraction process.

The TB3-LP model is designed for low-profile applications where counter space may be limited. Despite its compact design, it still offers impressive performance, brewing up to 3.8 gallons per hour. The low-profile feature makes it an ideal choice for settings that require efficiency and space optimization without compromising on the quality of the brew.

Another notable member of the series, the TB3Q and TB3Q-LP, feature a quick brew ratio, allowing users to brew up to 3 gallons of coffee in just a few minutes. These models are equipped with easy-to-use controls for simplified operation, making them perfect for staff training and user accessibility.

All models in the TB series include a hot water faucet, allowing users to dispense hot water for tea or other hot beverages quickly. This versatility adds significant value, especially in multi-beverage settings.

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In terms of technology, these brewers often incorporate advanced diagnostics to promptly identify service needs or issues. The machines come with a precise brewing temperature control system that ensures each cup is brewed at the optimal temperature for maximum flavor extraction.

Overall, Bunn's TB6Q, TB3-LP, TB6, TB3Q, and TB3Q-LP coffee brewers represent the culmination of advanced brewing technology and practical design for commercial coffee solutions. Their efficiency, quality, and ease of use make them a staple in many establishments, solidifying Bunn's reputation as a leader in the coffee brewing industry.
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