Bunn System III manual Only, Test Procedures Disconnect the brewer from the power source

Page 20

SERVICE (cont.)

CONTROL THERMOSTAT (ELECTRO/MECHANICAL

ONLY)

 

 

 

L2

1LT

 

L3T T

 

5LT

4LT

 

 

 

P2231.30

FIG. 8 CONTROL THERMOSTAT

Location:

The control thermostat is located inside the front of the brewer in the center of the component bracket.

Test Procedures:

1.Disconnect the brewer from the power source.

2.With a voltmeter, check the voltage across the blue wires on the control thermostat and the white insert on the three pole 120/208V, 120/240V ter- minal block or the red insert on two pole 240V terminal block. 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.

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.Gently remove the capillary bulb and grommet from the tank.

5.With a voltmeter, check the voltage across the black wires of the control thermostat and the white insert on the three pole 120/208V or 120/240V terminal blocks and the red insert on two pole 200V/240V terminal blocks when the control ther- mostat is turned "ON" (fully clockwise). 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.

Voltage must not be indicated across these termi- nals when the thermostat is turned "OFF" (fully counterclockwise).

6. Disconnect the brewer from the power source.

If voltage is present as described, reinstall the capillary tube into the tank to the line 7" above the bulb, the control thermostat is operating properly.

If voltage is not present as described, replace the thermostat.

Removal and Replacement:

1.Remove wires from the control thermostat.

2.Remove the thermostat capillary bulb by firmly pulling up on the capillary tube on top of the tank lid. This will disengage the grommet from tank lid.

3.Remove the #8-32 screw holding the control ther- mostat to the component bracket.

4.Slide the grommet to the line 7" above the bulb on the new capillary tube.

5.Insert the capillary bulb through the hole in the tank lid and press the grommet firmly and evenly so that the groove in the grommet fits into the tank lid.

6.Carefully bend the capillary tube so that the tube and bulb inside the tank are in the vertical position.

NOTE - The capillary tube must be clear of any electri- cal termination and not kinked.

7.Using a #8-32 screw, fasten the control thermo- stat to the component bracket.

8.Refer to Fig. 9 when reconnecting the wires.

9.Adjust the control thermostat as required.

BLU to Ready Light

BLU to RED Lead from Overflow

Protection Switch

BLK to BLK Lead on Contactor Coil

BLK to Ready Light

P1098

FIG. 9 CONTROL THERMOSTAT TERMINALS

Page 20

27362

092900

 

 

Page 19 Page 21
Image 20
Page 19 Page 21
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 RequirementsElectro/mechanical brewers Adjusting Brew VolumesInitial SET-UP 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 controlContents ServiceComponent Access 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.
Top Page Image Contents