Bunn U3A service manual Initial Setup, Adjusting Brew Volumes

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INITIAL SETUP (cont.)

6.Brewing cycles may be started whenever water temperature is correct. This condition is indicated by the dial thermometer on front of the brewer. Whenever the pointer is in the green, brewer is ready for brewing. The recommended brewing temperature is approximately 200° F (93°C). Water temperature may be increased by turning thermostat knob clockwise, decreased by turning knob counterclockwise.

7.When desired temperature is reached, insert funnel support, funnel and funnel cover in position. Be sure the water swing spout is over the center of the funnel cover, turn "ON/OFF" switch to the "ON" position, push and release "START" and run a brew cycle of hot water only. At the end of this cycle, brewer will be ready for checking timer adjustment.

8.The timer has been preset for a 4 minute cycle. This setting will deliver approximately 3 gallons of water per brewing cycle. To increase or decrease amount of water, adjust the timer as required. See Adjusting Brew

Volumes.

9.Having determined final settings of the thermostat and the timer, replace front cupola cover. Brewer is now ready for brewing coffee.

ADJUSTING BREW VOLUMES

CAUTION - Disconnect the power source from the brewer prior to the removal of any panel for the replacement or adjustment of any component.

NOTE: Prior to setting or modifying batch sizes, check that the brewer is connected to water supply, the tank is properly filled, and a funnel support, funnel and funnel cover are in place.

1.Modifying batch sizes. To modify a batch volume, first check that the SET/LOCK switch is in the “SET” posi- tion on the circuit board.

To increase a batch size. Press and hold the START or BREW switch until you see three breaks in the water stream from the swing arm. Release the switch (Failure to release the switch within two seconds after the third break in the water stream causes the volume setting to be aborted and previous volume setting will remain in memory) and press it again one or more times. Each time the switch is pressed, two seconds are added to the brew time period. Allow the brew cycle to finish in order to verify that the desired volume has been achieved.

To decrease a batch size. Press and release the START or BREW switch once for every two-second interval to be removed from the total brew time period; then immediately press and hold down the START or BREW switch until you see three breaks in the water stream from the swing arm. Release the switch. (Failure to release the switch within two seconds after the third break in the water stream causes the volume setting to be aborted and previous volume setting will remain in memory). Allow the brew cycle to finish in order to verify that the desired volume has been achieved.

2.Setting batch sizes. To set a batch volume, first check that the SET/LOCK switch is in the “SET” position on the circuit board. Press and hold the START or BREW switch until you see three breaks in the water stream from the swing arm, and then release the switch. (Failure to release the switch within two seconds after the third break in the water stream causes the volume setting to be aborted and previous volume setting will remain in memory). View the level of the liquid being dispensed. When the desired level is reached, turn the ON/OFF switch to “OFF” (lower). The brewer remembers this volume and will continue to brew batches of

this size until the volume setting procedure is repeated.

NOTE: When brewing coffee, batch volumes will decrease due to absorption by the coffee grounds.

NOTE: HALF-BATCH AND FULL BATCH SETTINGS MUST EACH BE SET SEPARATELY.

3.Setting programming disable feature. If it becomes necessary to prevent anyone from changing brew times once programmed, you can set the SET/LOCK switch to the “LOCK” position. This will prevent any program- ming to be done until switch is once again placed in the “SET” position.

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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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