Bunn System III manual Service, Location

Page 16

SERVICE (cont.)

BREW SELECTOR SWITCH

FIG. 4 BREW SELECTOR SWITCH

P1097.40

 

Location:

The brew selector switch is located in the front of the hood on the lower right side on DBC models and to the right of center on electro/mechanical models.

Test Procedure:

Timer or DBC

1.Disconnect the brewer from the power supply.

2.Separate the connector on the selector switch harness from the brew timer circuit board or DBC connector.

3.Check for continuity across the pink and tan wires on the connector when the switch is in the 1 gallon position. Continuity must not be present in any other position.

4.Check for continuity across the pink wire and the gray wire when the switch is in the 1-1/2 gallon position. Continuity must not be present in any other switch position.

5.Reattach the connector to the brew timer circuit board or DBC connector.

Grinder Interface:

6.Disconnect pink, gray and tan wires on the selector switch from the pink, gray and tan wires on the interface socket.

7.Check for continuity across the pink wire and the tan wire on the selector switch when the switch is in the 1 gallon position. Continuity must not be present in any other position.

8.Check for continuity across the pink wire and gray wire on the selector switch when the switch is in the 1-1/2 gallon position. Continuity must not be present in any other position.

9.Reconnect the pink, gray and tan wires on the selector switch to the pink, gray and tan wires on the interface socket.

Bypass Valve:

10.Disconnect the white/violet wire on the selector switch from the bypass valve coil and disconnect the white/red wire from the dispense valve coil.

11.Check for continuity across the white/violet wire and white/red wire when the selector is in the 1-1/ 2 gallon and 2 gallon position. Continuity must not be present in any other position.

12.Reconnect the white/violet wire to the bypass valve coil and the white/red wire to the dispense valve coil.

If continuity is as described the switch is operating properly.

If continuity is not present as described replace switch assembly.

Removal and Replacement:

1.Disconnect the connector on the selector switch harness from the brewer timer circuit board.

2.Disconnect wires from the selector switch, inter- face socket, dispense valve and bypass valve.

3.Loosen the set screw on the switch knob.

4.Remove the 9/16" nut and washer holding the switch to the hood.

5.Remove the switch.

6.Install the new switch. The positioning tab must be in the hole in the hood for proper switch and knob alignment.

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27362

092996

 

 

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Contents Bunn Warranty User Notices 20201.5600 00831.0000 00656.0000 03408.0000 03409.0000Models with digital brewer control assembly Electrical RequirementsModels with electro/mechanical thermostats Plumbing RequirementsInitial SET-UP Adjusting Brew VolumesElectro/mechanical brewers Cleaning Brew Selector SwitchStart Switch Operating ControlsTroubleshooting Problem Probable Cause RemedyTroubleshooting Problem Overflow protection switchBrew cycle will not start Digital Brewer Control Assem- bly DBCTroubleshooting Problem Probable Cause Remedy Triac assembly DBC Warmer elementSprayhead or airvent Mechanical StepTime adjustment Electro DBC volume adjustmentTimer adjustment Procedures. See page 34 orTroubleshooting Problem Cannot access the DBC Digital brewer control DBC display is blank Digital brewer controlComponent Access ServiceContents Service Bypass ValveService LocationBrew Selector Switch ELECTRO/MECHANICALContactor Assembly ELECTRO/MECHANICAL only Gently remove the capillary bulb and grommet from the tankService Contactor Assembly ELECTRO/MECHANICAL only Contactor Assembly TerminalsTest Procedures Disconnect the brewer from the power source OnlyDispense Valve ElectromechanicalDigital Brewer Control Board and Display DBC TION, Entry and DescriptionService Digital Brewer Control Board and Display DBC TRIAC/HEAT Sink Assembly DBC only TRIAC/HEAT SinkP2231.30 Terminals Limit Thermostat Limit ThermostatService ON/OFF Warmer Switch Black wire from the center terminalThree wire 120/240 volt models ModelsOverflow Protection Switch Test Procedure Disconnect the brewer from the power sourceService Solenoid Valve Refill Refill Solenoid ValveRefill Solenoid Terminals Start Switch Tank Heater LocationTimer ELECTRO/MECHANICAL Onlyearly Models Digital Timer ELECTRO/MECHANICAL only Late Models If voltage is as described, proceed to #7Timer Setting Digital Timer WiringWarmer 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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