Bunn U3A service manual Transformer, Remove the transformer and discard

Page 35

SERVICE (cont.)

TRANSFORMER (380V THREE WIRE MODELS ONLY)

P1752.55

FIG. 34 TRANSFORMER

Location:

The transformer is located on the top rear of the timer mounting bracket.

Test Procedures:

1.Disconnect the brewer from the power source.

2.Disconnect black wire and the red wire from the terminal block at the transformer.

3.With a voltmeter, check the voltage across the black wire and the red wire. Connect the brewer to the power source. The indication must be 380 volts ac.

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 diagram and check the brewer wiring harness.

5.Reconnect the black wire and the red to the trans- former.

6.Disconnect the black wire and the white wire from the transformer terminals.

7.With a voltmeter, check the voltage across the transformer terminals. Connect the brewer to the power source. The indication must be 120 volts ac.

If voltage is present as described, the transformer is operating properly

If voiltage is not present as described, replace the transformer.

Removal and Replacement:

1.Disconnect all the wires from the transformer.

2.Remove the two #8-32 screws securing the trans- form to the transformer mounting bracket.

3.Remove the transformer and discard.

4.Position new transformer on transformer mounting bracket and secure with two #8-32 screws.

5.Refer to Fig. 35 and reconnect the wires.

RED from

WHI from Main

 

Terminal Block

 

Harness

 

 

 

BLK from

BLK from

 

Terminal Block

Main Harness

 

FIG. 35 TRANSFORMER TERMINALS

P1753

 

Page 35

10060

031599

 

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Contents Phone 217 529-6601 FAX 217 U3ABUNN-O-MATIC Commercial Product Warranty User Notices IntroductionElectrical Requirements Electrical Installation InstructionsPlumbing Requirements Initial SetupCE Requirements Adjusting Brew Volumes Initial SetupFilter Holder CleaningCoffee Brewing 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 Contents ServiceComponent Access Location ServiceWire Models and 440V Four Wire Models 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 BLK from Main Harness RED to Main Harness ON/OFF SwitchTest Procedures Disconnect the brewer from the power source 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 #8If voltage is as described, proceed to #7 Service Digital Timer Late ModelsAdjust the timer as described below Timer Setting 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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