Bunn System III manual P2231.30

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FIG. 15 LIQUID LEVEL CONTROL BOARD AND PROBE

SERVICE (cont.)

LEVEL CONTROL BOARD AND LEVEL PROBE (Electro/ mechanical only)

 

3TL

2LT

LT1

LT5

L4T

 

 

P2231.30

Location:

The level control board is located inside the front of the brewer on the lower left side of the component bracket. The level probe is located inside the hood on the left center rear of the tank lid next to the limit thermostat.

Test Procedure:

1.Disconnect the brewer from the power source.

2.Remove the violet wire from terminal 1 & pink wire from terminal 4 of the circuit board.

3.With a voltmeter, check the voltage across termi- nals 2 & 3. Connect the brewer to the power source. The indication must be:

a.) 120 volts ac for three wire 120/208 volt models and three wire 120/240 volt models.

b.) 200 to 240 volts ac for two wire 200 or 240 volt 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 har- ness.

5. Reconnect the violet wire to terminal 1.

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.With a voltmeter, check the voltage across termi- nals 1 & 3. Connect the brewer to the power source. The indication must be:

a.) 120 volts ac for three wire 120/208 volt models and three wire 120/240 volt models after a delay of approximately 1 second.

b.) 200 to 240 volts ac for two wire 200 or 240 volt models after a delay of approximately 1 second.

8.Touch the free end of jumper wire to the brewer housing. The indication must be 0.

9.Move the jumper wire away from the brewer housing. The indication must again be:

a.)120 volts ac for three wire 120/208 volt models and three wire 120/240 volt models after a delay of approximately 1 second.

b.) 200 to 240 volts ac for two wire 200 or 240 volt models after a delay of approximately 1 second.

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

If voltage is present as described, the level control board is operating properly, proceed to #11.

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

11.Reconnect the pink wire to terminal 4.

12.Gently pull the probe out of the tank lid and inspect for corrosion. Replace it if necessary.

13.Place the probe so that neither end is in contact with any metal surface of the brewer.

14.With a voltmeter, check the voltage across termi- nals 1 & 3. Connect the brewer to the power source. The indication must be:

a.) 120 volts ac for three wire 120/208 volt mod- els and three wire 120/240 volt models after a delay of approximately 1 second.

b.) 200 to 240 volts ac for two wire 200 or 240 volt models after a delay of approximately 1 second.

15.Move the probe's flat end to the brewer housing. The indication must be 0.

16.Move the probe's flat end away from the brewer housing. The indication should be:

a.)120 volts ac for three wire 120/208 volt models and three wire 120/240 volt models after a delay of approximately 1 second.

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27362

092996

 

 

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Contents Bunn Warranty 20201.5600 00831.0000 00656.0000 03408.0000 03409.0000 User NoticesElectrical Requirements Models with digital brewer control assemblyModels with electro/mechanical thermostats Plumbing RequirementsInitial SET-UP Adjusting Brew VolumesElectro/mechanical brewers Brew Selector Switch CleaningStart Switch Operating ControlsProblem Probable Cause Remedy TroubleshootingOverflow protection switch Troubleshooting ProblemBrew cycle will not start Digital Brewer Control Assem- bly DBCTroubleshooting Problem Probable Cause Remedy Warmer element Triac assembly DBCSprayhead or airvent Mechanical StepDBC volume adjustment Time adjustment ElectroTimer adjustment Procedures. See page 34 orTroubleshooting Problem DBC display is blank Digital brewer control Cannot access the DBC Digital brewer controlComponent Access ServiceContents Bypass Valve ServiceLocation ServiceELECTRO/MECHANICAL Brew Selector SwitchGently remove the capillary bulb and grommet from the tank Contactor Assembly ELECTRO/MECHANICAL onlyContactor Assembly Terminals Service Contactor Assembly ELECTRO/MECHANICAL onlyOnly Test Procedures Disconnect the brewer from the power sourceElectromechanical Dispense ValveTION, Entry and Description Digital Brewer Control Board and Display DBCService Digital Brewer Control Board and Display DBC TRIAC/HEAT Sink TRIAC/HEAT Sink Assembly DBC onlyP2231.30 Terminals Limit Thermostat Limit ThermostatBlack wire from the center terminal Service ON/OFF Warmer SwitchThree wire 120/240 volt models ModelsTest Procedure Disconnect the brewer from the power source Overflow Protection SwitchRefill Solenoid Valve Service Solenoid Valve RefillRefill Solenoid Terminals Start Switch Location Tank HeaterTimer ELECTRO/MECHANICAL Onlyearly Models If voltage is as described, proceed to #7 Digital Timer ELECTRO/MECHANICAL only Late ModelsDigital Timer Wiring Timer SettingWarmer Element Lower 27362 092900 Lower

System III specifications

The Bunn System III is a versatile and efficient commercial brewing system designed for high-demand environments such as cafés, restaurants, and catering operations. Renowned for its reliability and performance, the System III combines advanced brewing technology with user-friendly features to deliver exceptional coffee consistently.

One of the key features of the Bunn System III is its innovative brewing technology, which employs a unique infuser system. This design allows for optimal extraction of coffee flavors by ensuring that hot water is evenly distributed over the coffee grounds, maximizing flavor and ensuring a rich, balanced cup every time. The brewing system can brew up to 3.8 gallons of coffee per hour, making it an ideal choice for busy establishments.

The System III is equipped with an impressive built-in water heater that maintains a temperature of approximately 200°F, which is crucial for brewing coffee at the ideal temperature. This consistent temperature control minimizes the risk of under-extraction or over-extraction, resulting in better-tasting coffee. Additionally, the hot water faucet feature allows users to brew tea or instant beverages on demand, further enhancing the system's versatility.

Another characteristic that sets the Bunn System III apart is its user-friendly interface. The system is designed with intuitive controls, allowing baristas and kitchen staff to operate it with minimal training. The easy-to-read digital display provides critical information such as brew time and water temperature, ensuring that users can monitor the brewing process closely.

Durability is a hallmark of the Bunn System III. Constructed from high-quality materials, this brewing system is designed to withstand the rigors of commercial use. Its robust design ensures longevity and minimizes the need for frequent maintenance, making it a cost-effective choice for businesses.

The Bunn System III also features a large-capacity brew basket, capable of holding ample coffee grounds for high-volume brewing. This basket, combined with the system's efficient design, allows for quick and easy brewing, making it perfect for high traffic situations.

In conclusion, the Bunn System III coffee brewing system is a top choice for commercial coffee operations. Its advanced brewing technology, consistent temperature control, user-friendly features, and durable construction combine to create an exceptional brewing experience. Whether in a café, restaurant, or catering service, the Bunn System III stands out as an indispensable tool for delivering high-quality coffee efficiently.
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