Bunn System III manual Service, Bypass Valve

Page 15

SERVICE (cont.)

BYPASS VALVE

 

 

 

 

1

 

 

 

 

L2

LT

 

 

L4

L3

T

 

 

5

T

 

 

 

TL

T

 

 

 

 

FIG. 2 BYPASS VALVE

P2231.35

 

Location:

The bypass valve is located inside the hood on the left side just in front of the tank.

Test Procedures:

1.Disconnect the brewer from the power source.

2.With a voltmeter, check the voltage across the white/green wire and the white/violet wire on the bypass valve. Connect the brewer to the power source. With the "ON/OFF (Warmer)" switch in the "ON" (upper) position, and the selector switch in the 1-1/2 or 2 gallon position press the start switch. 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.

3.Disconnect the brewer from the power source.

If voltage is present as described, proceed to #4.

If voltage is not present as described refer to the Wiring Diagrams and check the brewer wiring har- ness.

4.Disconnect the white/green wire and white/violet wire. Check for continuity across the bypass valve coil terminals.

If continuity is present as described, reconnect the white/green and white/violet wires to the bypass valve and proceed to #5.

If continuity is not present as described, replace the bypass valve.

5.Check the bypass valve for coil action. Connect brewer to the power source. With the "ON/OFF (Warmer)" switch in the "ON" (upper)position press the start switch. Listen carefully in the vicinity of the bypass valve for a "clicking" sound as the coil attracts and repels the plunger.

If the sound is heard as described, there may be a blockage in the water line before the bypass valve or the bypass valve may require inspection for wear and removal of waterborne particles.

If the sound is not heard as described, replace the bypass valve.

Removal and Replacement:

1.Remove the wires from the bypass valve.

2.Drain enough water from the tank so bypass valve is above the water line.

3.Remove water lines from valve.

4.Remove two nuts retaining bypass valve inside the hood and remove bypass valve.

5.Install new bypass valve.

6.Reconnect the water tubes and the wires to the bypass valve.

7.Refer to FIG. 3 when reconnecting the wires.

WHI/VIO to Brew Selector Switch

WHI/GRN to Dispense Valve

FIG. 3 BYPASS VALVE TERMINALS

P1096

 

Page 15

27362

092900

 

 

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Contents Bunn Warranty 20201.5600 00831.0000 00656.0000 03408.0000 03409.0000 User NoticesPlumbing Requirements Models with digital brewer control assemblyElectrical Requirements Models with electro/mechanical thermostatsAdjusting Brew Volumes Initial SET-UPElectro/mechanical brewers Operating Controls CleaningBrew Selector Switch Start SwitchProblem Probable Cause Remedy TroubleshootingDigital Brewer Control Assem- bly DBC Troubleshooting ProblemOverflow protection switch Brew cycle will not startTroubleshooting Problem Probable Cause Remedy Step Triac assembly DBCWarmer element Sprayhead or airvent MechanicalProcedures. See page 34 or Time adjustment ElectroDBC volume adjustment Timer adjustmentTroubleshooting Problem DBC display is blank Digital brewer control Cannot access the DBC Digital brewer controlService Component AccessContents 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 ThermostatModels Service ON/OFF Warmer SwitchBlack wire from the center terminal Three wire 120/240 volt 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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