Bunn U3A ON/OFF Switch, Test Procedures Disconnect the brewer from the power source

Page 22
FIG.14 ON/OFF SWITCH

SERVICE (cont.)

ON/OFF SWITCH

P2209.60

Location:

The ON/OFF switch is located on the left side of the switch mounting bracket. The switch mounting bracket is mounted on the front of the component bracket.

Test Procedures:

1.Disconnect the brewer from the power source.

2.a)120/208V, 120/240V, 208V and 240V Models Remove the black wire on the ON/OFF switch from the fuse holder or circuit breaker and the red wire on the power indicator light.

b)380V and 440V Models - Remove the black wire on the ON/OFF switch from the fuse holder or circuit breaker and the white wire from the power indicator light.

c) 230V - CE Models - Remove the red wire on the ON/OFF switch from the fuse holder and the black

wire on the power indicator light.

3.Connect the brewer to the power source. With a voltmeter, check the voltage across the removed wires. The indication must be:

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

380 volt models.

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

c)240 volts ac for two wire 240 volt models prior to #U300004095 and three wire 240 volt models.

d)230 volts ac for two wire 230 volt models #U300004095 and up).

e)208 or 240 volts ac for four wire 440 volt mod- els.

4.Disconnect the brewer from the power source.

If voltage is present as described, reconnect the wires and proceed to #5

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

5.Disconnect the wires on the ON/OFF switch.

6.a) 120/208V, 120/240V, 208V, 240V, 380V and 440V Models - Check for continuity across the terminals on the rear of the switch with the switch in the "ON" (upper) position. Continuity must not be present when the switch is in the "OFF" (lower) position.

b) 230V - CE Models - Check for continuity across the center terminal (2) and the lower terminal (1) when the switch is in the "ON" (upper) position. Continuity must not present when the switch is in "OFF" (lower) position.

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

If continuity is not present as described, replace the switch.

Removal and Replacement:

1.Remove the wires from the switch terminals.

2.Compress the clips on the back side of the switch mounting bracket and gently push the through the opening.

3.Push the new switch into the opening and spread the clips to hold switch in the mounting bracket.

NOTE: ON 230V - CE models terminal (3) must be on the top.

4.Refer to Fig. 15 and reconnect the wires. BLK from Main Harness

BLK to Start Switch, Brew

Timer & Liuqid Level Board

L2

120/208V, 120/240V, 208V, 240V, 380V AND 440V

MODELS

BLK from Main Harness

RED to Main Harness

RED to Start Switch, Brew Timer & Liquid Level Board

230V - CE Models

FIG. 15 ON/OFF SWITCH TERMINALS

P1735

 

Page 22

10060

080900

 

Image 22
Contents U3A Phone 217 529-6601 FAX 217BUNN-O-MATIC Commercial Product Warranty Introduction User NoticesElectrical Installation Instructions Electrical RequirementsCE Requirements Initial SetupPlumbing Requirements Initial Setup Adjusting Brew VolumesCoffee Brewing CleaningFilter 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 Component Access ServiceContents Wire Models and 440V Four Wire Models ServiceLocation 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 Test Procedures Disconnect the brewer from the power source ON/OFF SwitchBLK 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 LeadAdjust the timer as described below Timer Setting Service Digital Timer Late ModelsIf 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.