Bunn U3A Service Timer Early Modelscont, If voltage is present as described, proceed to #8

Page 32

SERVICE (cont.)

TIMER (Early Models)(cont.)

5.With a voltmeter, check the voltage across the sockets P1 and P2 (blue and white wires) of the female connector on the main harness when the "ON/OFF" switch is in the "ON" (upper) position and the start switch pressed. Connect the brewer to the power source. The indication must be:

a)120 volts ac for three wire 120/208 volt, 120/240 volt, 380 volt models and 208 or 240 volt ac for four wire 440 volt models.

b)208 volts ac for two and three wire 208 volt models.

c)240 volts ac for two and three wire 240 volt models.

d)230 volts ac for two wire 230 volt CE models.

6.Disconnect the brewer from the power source.

7.Reconnect the three pin connector from the main wiring harness to the connector on the timer.

If voltage is present as described, proceed to #8.

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

8.Disconnect the black and white wires to the pump.

9.With a voltmeter, check the voltage across the black and white wires when the "ON/OFF" switch is in the "ON" (upper) position and the start switch pressed to the start position and released. Connect the brewer to the power source. The indication must be:

a)120 volts ac for three wire 120/208 volt, 120/240 volt, 380 volt and 208 or 240 volt ac for four wire 440 volt models.

b)208 volts ac for two and three wire 208 volt models.

c)240 volts ac for two and three wire 240 volt models.

d)230 volts ac for two wire 230 volt CE models.

If voltage is present as described, the brew timer is operating properly. Reset the timer dial as required, to obtain the desired brew volume.

If voltage is not present as described, replace the timer.

Removal and Replacement:

1.Separate all connectors between the brewer wiring harness and the timer.

2.Disconnect the timer leads from the pump leads.

3.Remove the two #8-32 screws securing the brew timer to the component bracket and remove timer.

4.Install new timer circuit board as described in Late Model Timer section on the following pages.

5.Refer to Fig. 33 to reconnect the wires.

6.Install the Timer Setting Decal, provided with the timer replacement kit, on the back of the front access panel.

7.Adjust the timer as required. Refer to Late Model Timer section on the following pages.

Three Pin Connector from

 

Half/Full Batch Switch

 

To Three Pin Female

Connector on Main

 

Harness

 

BLK to Pump

 

Lead

 

WHI to Pump Lead

OLD STYLE

 

FIG. 31 TIMER TERMINALS

P1751

 

Page 32

10060

080900

 

Page 31 Page 33
Image 32
Page 31 Page 33
Contents U3A Phone 217 529-6601 FAX 217BUNN-O-MATIC Commercial Product Warranty Introduction User NoticesElectrical Installation Instructions Electrical RequirementsPlumbing Requirements Initial SetupCE Requirements Initial Setup Adjusting Brew VolumesFilter Holder CleaningCoffee Brewing Troubleshooting Problem Probable CauseBrew cycle will not start No water BrewerTroubleshooting Problem RemedyRefer to Service Circuit Breaker for testing procedures. See Use Bunn filters made for the U3 brewer Remove obstructionRemove 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 thermostatReconnect the blue wire to T1 on the liquid level board Liquid Level Board and Level ProbeModel Voltage Jumper Not TouchingLiquid 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 AssemblyRelay Brewers W/BREW Lockout If voltage is present as described, proceed to #3Removal and Replacement Disconnect the wires from the relay Refer to and reconnect the wires BLU from Start SwitchBrew Timer BLU to Start Switch BLU from Brew TimerSelector Switch Half Batch Option Selector Switch Half BATCHP1317.30Solenoid SolenoidEarly Models Start Switch Brew Start Switch BrewTank Heaters Tank HeaterTimer Early Models Thermal Fuses 230V-CE Models onlyService Timer Early Modelscont Disconnect the black and white wires to the pumpIf voltage is present as described, proceed to #8 Harness BLK to Pump Lead WHI to Pump LeadIf voltage is as described, proceed to #7 Service Digital Timer Late ModelsAdjust the timer as described below Timer Setting Digital Timer Terminals Transformer Remove the transformer and discardService Master ON/OFF Switch Late Models Master ON/OFF Switch LOC120/208 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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