Bunn U3A service manual Tank Heaters

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SERVICE (cont.)

TANK HEATERS

FIG. 26 TANK HEATER

P2209.60

 

Location:

 

The tank heaters are located on the right center and the left center of the component bracket.

Test Procedures:

1.Disconnect the brewer from the power source.

2.Disconnect the wires from the tank heater.

3.Check for continuity across the tank heater termi- nals.

If continuity is present as described, proceed to #4. If continuity is not present as described, replace the tank heater.

Removal and Replacement:

1.Remove the wires or thermal fuses from the tank heater.

2.Remove the four #8-32 screws securing the tank heater to the component bracket.

3.Remove tank heater and gasket.

4.Position new tank heater and gasket on the compo- nent bracket and secure with four #8-32 screws.

5.Refer to Fig. 27 and reconnect the wires.

BLK to Contactor L1 (120/208V, 120/240 Three

Wire Single Phase, 208V

and 240V Two Wire, Single Phase)

BLU to Main Harness (208V, 240V, 380V Three Wire ,Three Phase and 380V,440V Four Wire, Three Phase

BLK (Thermal Fuse to Contactor Lower Left Terminal) (230V-CE Mod- els)

RED to Contactor T2 (All Models Except 230V-CE Models)

RED (Thermal Fuse) to Con- tactor Top Right Terminal) (230V-CE Models)

RED to Contactor L2 (120/208V, 120/240 Three Wire Single Phase, 208V and 240V Two Wire, Single Phase)

BLU to Main Harness (208V, 240V, 380V Three Wire ,Three Phase and 380V,440V Four Wire, Three Phase

RED (Thermal Fuse) to Contactor Lower Right Terminal)

BLK to Contactor T1 (All Models Except 230V-CE Models)

BLK (Thermal Fuse) to Contactor Top Left Termi- nal) (230V-CE Models)

LEFT

 

RIGHT

 

FIG. 27 TANK HEATER TERMINALS

P1746

 

 

 

 

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10060

031599

 

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Contents U3A Phone 217 529-6601 FAX 217BUNN-O-MATIC Commercial Product Warranty Introduction User NoticesElectrical Installation Instructions Electrical RequirementsInitial Setup CE RequirementsPlumbing Requirements Initial Setup Adjusting Brew VolumesCleaning Coffee BrewingFilter Holder Brew cycle will not start No water TroubleshootingProblem Probable Cause 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 Service Component AccessContents Service Wire Models and 440V Four Wire ModelsLocation Contactor ContactorService Contactor Control Thermostat Fuse and Fuse Hilder Limit Thermostat Limit thermostatModel Voltage Reconnect the blue wire to T1 on the liquid level boardLiquid Level Board and Level Probe Jumper Not TouchingLiquid 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 AssemblyRelay Brewers W/BREW Lockout If voltage is present as described, proceed to #3Brew Timer Removal and Replacement Disconnect the wires from the relayRefer to and reconnect the wires BLU from Start Switch 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 onlyIf voltage is present as described, proceed to #8 Service Timer Early ModelscontDisconnect the black and white wires to the pump Harness BLK to Pump Lead WHI to Pump LeadService Digital Timer Late Models Adjust the timer as described below Timer SettingIf voltage is as described, proceed to #7 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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