Bunn U3A service manual Solenoid

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SERVICE (cont.)

SOLENOID

P2209.60

FIG. 22 SOLENOID

Location:

The solenoid is mounted on the upper left rear of the component bracket.

Test Procedures:

1.Disconnect the dispenser from the power source.

2.A) For 120/208 volt and 120/240 volt three wire, single phase models, 380 volt three wire, three phase models and 380 volt, 440 volt four wire, three phase models, disconnect the black wire from the liquid level board #2 and the white wire on the solenoid. With a voltmeter, check the voltage across the black and the white wire. Connect the brewer to the power source. The indication must be:

a)120 volts ac for 380 volt three wire, three phase models and 208 0r 240 volts ac for four wire three phase 440 volt models.

b)208 volts ac for three wire 120/208 volt mod- els.

c)240 volts ac for three wire 120/240 volt mod- els.

B) For 208 volt, 240 volt two wire single phase and 208 volt, 240 volt three wire three phase models, disconnect the black wire from the liquid level board #2 and the red wire from the solenoid. With a voltmeter, check the voltage across the black and red wires. Connect the brewer to the power source. The indication must be:

a)208 volts ac for 208 volt two wire single phase and 208 volt three wire three phase models.

b)240 volts ac for 240 volt two wire single phase and 240 volt three wire three phase models.

C) For 230V - CE two wire single phase models, disconnect the red wire from the liquid level board #2 and the black wire from the solenoid. With a voltmeter, check the voltage across the red wire and the black wire. Connect the brewer to the power source. The indication must be 230 volts ac.

3.Disconnect the dispenser from the power source.

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

If voltage is not present as described, refer to the brewer Wiring Diagrams and check the wiring harness.

4.Disconnect the blue wire and the white wire, the blue wire and the red wire or blue wire and black wire from the solenoid terminals.

5.Check for continuity across the solenoid valve coil terminals.

If continuity is present as described, reconnect the wires to the solenoid.

If continuity is not present as described, replace the solenoid valve.

6.Check the solenoid valve for coil action. Connect the dispenser to the power source. Listen carefully in the vicinity of the solenoid valve for a "clicking" sound as the coil magnet attracts.

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 the wires from the solenoid valve.

2.Turn off the water supply to the dispenser.

3.Disconnect the water inlet line from the connector on the solenoid valve.

4.Remove the #10-32 screw and the flat washer securing the liquid level board, shield and the solenoid to the component bracket.

5.Remove solenoid, connectors, air chamber and tank inlet tube as an assembly.

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10060

080900

 

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Contents Phone 217 529-6601 FAX 217 U3ABUNN-O-MATIC Commercial Product Warranty User Notices IntroductionElectrical Requirements Electrical Installation InstructionsInitial Setup CE RequirementsPlumbing Requirements Adjusting Brew Volumes Initial SetupCleaning Coffee BrewingFilter Holder Brewer TroubleshootingProblem Probable Cause Brew cycle will not start No waterTroubleshooting Remedy ProblemUse Bunn filters made for the U3 brewer Remove obstruction Refer to Service Circuit Breaker for testing procedures. SeeRemove and clean lime off the tank heater. See Service Component AccessContents Service Wire Models and 440V Four Wire ModelsLocation Contactor ContactorService Contactor Control Thermostat Fuse and Fuse Hilder Limit thermostat Limit ThermostatJumper Not Touching Reconnect the blue wire to T1 on the liquid level boardLiquid Level Board and Level Probe Model VoltageLiquid Level Board Terminals ON/OFF Switch Test Procedures Disconnect the brewer from the power sourceBLK from Main Harness RED to Main Harness Pump Assembly Pump AssemblyIf voltage is present as described, proceed to #3 Relay Brewers W/BREW LockoutBLU to Start Switch BLU from Brew Timer Removal and Replacement Disconnect the wires from the relayRefer to and reconnect the wires BLU from Start Switch Brew TimerSelector Switch Half BATCHP1317.30 Selector Switch Half Batch OptionSolenoid SolenoidEarly Models Start Switch Brew Start Switch BrewTank Heater Tank HeatersThermal Fuses 230V-CE Models only Timer Early ModelsHarness BLK to Pump Lead WHI to Pump Lead Service Timer Early ModelscontDisconnect the black and white wires to the pump If voltage is present as described, proceed to #8Service Digital Timer Late Models Adjust the timer as described below Timer SettingIf voltage is as described, proceed to #7 Digital Timer Terminals Remove the transformer and discard TransformerMaster ON/OFF Switch LOC Service Master ON/OFF Switch Late Models120/208 Volts AC 120/240 Volts AC 3 Wire + GND Single Phase 10060 080900 10060 080900 Schematic Wiring Diagram U3A CE Schematic Wiring Diagram U3833 Schematic Wiring Digram U3833

U3A, U3 specifications

Bunn U3A, also known as Bunn's U3A, is a unique and innovative approach to education that caters specifically to retirees and senior citizens. The primary aim of this initiative is to foster lifelong learning and social engagement among older adults, empowering them to explore various subjects of interest and connect with like-minded individuals.

One of the main features of Bunn U3A is its diverse range of courses and activities. From art and music appreciation to digital literacy and gardening, participants can choose from a variety of subjects that pique their interest. This broad curriculum is designed to cater to varied backgrounds and skill levels, ensuring that everyone finds something that resonates with them. The courses are typically led by volunteer tutors, many of whom are retired professionals passionate about sharing their knowledge and experiences.

Another characteristic of Bunn U3A is its strong emphasis on community and socialization. By providing a supportive and welcoming environment, members are encouraged to interact, collaborate, and form friendships. The organization often hosts events, workshops, and excursions, further enhancing the sense of belonging and camaraderie among participants. This communal aspect is crucial for combating feelings of isolation that can sometimes accompany retirement.

Bunn U3A leverages technology to enhance the learning experience. Many courses integrate digital tools and online platforms, enabling participants to access resources and engage in discussions beyond the classroom. This tech-savvy approach ensures that members are equipped with essential skills that are increasingly relevant in today’s digital world. As a result, participants often find themselves not only enriching their knowledge but also enhancing their technological proficiency.

In addition to its educational offerings and community focus, Bunn U3A promotes a culture of inclusivity. Everyone, regardless of previous academic background, is welcomed to join, emphasizing that learning is a lifelong journey. The philosophy that underpins Bunn U3A is one of empowerment, with a commitment to ensuring that older adults continue to thrive intellectually, socially, and emotionally.

In summary, Bunn U3A stands out as a vibrant learning community that prioritizes the educational and social needs of retirees. With its diverse courses, strong community bonds, and integration of technology, it serves as a model for how organizations can successfully promote lifelong learning and engagement among older individuals, enriching their lives in meaningful ways.
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