Bunn U3A service manual Liquid Level Board and Level Probe, Model Voltage, Jumper Not Touching

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SERVICE (cont.)

LIQUID LEVEL BOARD AND LEVEL PROBE

FIG.12 LIQUID LEVEL BOARD AND

P2209.60

 

LEVEL PROBE

 

Location:

 

The liquid level board is located on the left rear of the component bracket. The level probe is located on the right rear of the component bracket.

Test Procedures:

1.Disconnect the brewer from the power source.

2.Disconnect the blue wire (T1) and the pink wire (T4).

3.Check the voltage across terminals (T2) and (T3) with the ON/OFF switch in the "ON" position. The indication must be:

a)120 volts ac for 120/208 volt, 120/240 volt and

380 volt models.

b)208 volts ac or 240 volts ac for two wire 208 volt or 240 volt models.

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

e)220 volts ac or 440 volts ac for four wire 280 volt or 440 volt machines.

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 Diagrams and check the brewer wiring harness.

5.Reconnect the blue wire to T1 on the liquid level board.

6.Carefully connect a piece of insulated jumper wire to terminal 4. Keep the other end of this wire away from any metal surface of the brewer.

7.Touching the free end of the jumper to the brewer's frame simulates a "FULL" condition, preventing jumper from touching the brewer's frame simulates "NEED WATER" condition. Connect the brewer to the power source, simulate the conditions in the chart below while measuring the voltage between T1 and T3 0n the liquid level board. Repeat these several times. There is an approximate five second delay for output to stabilize.

Model

Voltage -

Voltage -

 

Jumper

Jumper

 

Not Touching

Touching

 

Frame

Frame

120/208V &

120V

0

120/240V - 3

 

 

wire w/ground

 

 

single phase

 

 

230V - 2 wire

230V

0

w/ground

 

 

single phase

 

 

208V or 240V -

208V or

0

2 wire wground

240V

0

single phase

 

 

280V or 440V -

220V or

0

4 wire w/ground

254V

0

3 phase

 

 

380V - 3 wire

120V

0

w/ground 3

 

 

phase w/

 

 

stepdown trans- former

8. Disconnect the brewer from the power source and remove the jumper wire from terminal 4.

If voltage is present as described, liquid level board is operating properly, proceed to #9.

If voltage is not present as described, replace the liquid level board.

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080900

 

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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.

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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.