Bunn U3A service manual Thermal Fuses 230V-CE Models only, Timer Early Models

Page 31

SERVICE (cont.)

THERMAL FUSES (230V-CE MODELS ONLY)

 

 

 

J2

 

 

J1

 

 

 

 

 

 

2

1

 

 

3

TL

 

4

TL

 

L5

TL

 

 

TL

 

 

 

T

 

 

 

 

FIG. 28 THERMAL FUSES

 

P1750.65

 

 

Location:

The thermal fuses are mounted on the tank heater terminals and the contactor terminals.

Test Procedures:

1.Disconnect the brewer from the power source.

2.Disconnect the thermal fuse from the tank heater terminal and the contactor terminal.

3.Check for continuity across the terminals on the ends of the thermal fuse.

If continuity is present as described, the thermal is operating properly.

If continuity is not present as described, replace the thermal fuse.

Removal and Replacement:

1.Disconnect the thermal fuse from the tank heater terminal and the contactor and discard.

2.Connect the new thermal fuse to the tank heater terminal and the contactor terminal.

TIMER (Early Models)

OLD STYLE

 

FIG. 29 TIMER

P1722.55

 

Location:

 

The timer is located on the front center of the component bracket.

Test Procedures:

1.Disconnect the brewer from the power source.

2.Disconnect the polarized, three pin connector from the brewer main harness and rotate the brew timer dial fully counterclockwise.

3.With a voltmeter, check the voltage across sockets P2 and P3 (white and black wire or red wire) of the female connector on the main wiring harness when the "ON/OFF" switch is in the "ON" (upper) position. 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 volts 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.

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 the Wiring Diagrams and check the brewer wiring harness.

Page 31

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 InstructionsCE Requirements Initial SetupPlumbing Requirements Adjusting Brew Volumes Initial SetupCoffee Brewing CleaningFilter 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 Component Access ServiceContents Wire Models and 440V Four Wire Models ServiceLocation 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 Test Procedures Disconnect the brewer from the power source ON/OFF SwitchBLK 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 #8Adjust the timer as described below Timer Setting Service Digital Timer Late ModelsIf 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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