Bunn System III manual Timer ELECTRO/MECHANICAL Onlyearly Models

Page 34

SERVICE (cont.)

TIMER (ELECTRO/MECHANICAL ONLY)(EARLY MODELS)

OLD STYLE

P1093

FIG. 29 TIMER

Location:

The timer is located inside the right front of the brewer on the upper part of the component bracket.

tion. Select the 2 gallon batch setting. Connect the brewer to the power source and 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 for approxi- mately 1 minute 20 seconds for 2 gallon batch. b.) 200 to 240 volts ac for two wire 200 or 240 volt models for approximately 1 minute 20 seconds for 2 gallon batch.

7.Select a 1-1/2 gallon batch and repeat #6. The voltage indication should remain for approximately 1 minute.

8.Select a 1 gallon batch and repeat #6. The indica-

tion should remain approximately 40 seconds. If voltage is present as described the timer is function- ing properly.

If voltage is not present as described, replace the timer and adjust the dial(s) as required.

 

Removal and Replacement:

 

 

Test Procedures:

1. Remove all wires from the timer.

 

 

1. Disconnect the brewer from the power source.

2. Remove the two #6-32 keps nuts holding circuit

2. Disconnect the wires from the timer terminals

 

board and two #8-32 keps holding dial plate on to

TL3, TL4 and TL5 and rotate the dial(s) fully

 

the component mounting bracket.

 

 

counterclockwise.

3. Remove circuit board, nylon spacers and

dial

3. With a voltmeter, check the voltage across termi-

 

plate.

 

 

nals TL1 and TL2 when the "ON/OFF (Warmer)"

4. Install new timer directly to component mounting

switch is in the "ON" (upper) position. Connect the

 

bracket as described in Late Model Timer Section.

brewer to the power source. The indication must

5. Refer to Fig. 32 when reconnecting wires.

 

 

be:

6. Install the Timer Setting Decal, provided with the

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

 

replacement timer, on the inside of the front ac-

and three wire 120/240 volt models.

 

cess panel.

 

 

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

7. Adjust the timer as required. Refer to Late Model

models.

 

Timer Section on the following pages.

 

 

4. Disconnect the brewer from the power source.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

If voltage is present as described, proceed to #5.

 

 

 

 

 

 

 

OLD STYLE

 

 

If voltage is not present as described, refer to the

 

 

 

 

 

 

 

 

 

 

 

Wiring Diagrams and check the brewer wiring har-

 

 

 

 

 

 

 

 

 

 

 

ness.

 

 

 

 

 

 

 

 

 

 

 

5. Check for continuity across the white/orange wire

 

 

 

 

 

 

 

WHI/VIO TL1 to ON/OFF Switch

 

 

 

 

 

 

 

 

 

 

and white/yellow wire when the start switch is

 

 

 

 

 

 

 

WHI TL2 to Terminal BLock (WHI Insert)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

pressed.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(120/208V or 120/240V Three Pole Ter-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

minal Block)

 

 

If continuity is present as described, reconnect the

 

 

 

 

 

 

 

RED TL2 to Terminal Block (RED Insert)

 

 

 

 

 

 

 

(200V or 240V Two Pole Terminal Block)

wires to terminals TL3, TL4 and TL5 of the timer board

 

 

 

 

 

 

 

WHI/ORN TL3 to Start Swtich

 

 

and proceed to #6.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WHI/GRN TL4 to Dispense Valve

 

 

6. With a voltmeter, check the voltage across termi-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WHI/YEL TL5 to Start Switch

 

 

nals TL1 and TL4 with a voltmeter when the "ON/

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P1109

OFF (Warmer)" switch is in the "ON" (upper) posi-

 

 

 

 

 

 

 

 

 

 

 

FIG. 30 TIMER TERMINALS

 

 

 

 

 

 

 

 

Page 34

27362

092900

 

 

Page 33 Page 35
Image 34
Page 33 Page 35
Contents Bunn Warranty User Notices 20201.5600 00831.0000 00656.0000 03408.0000 03409.0000Models with electro/mechanical thermostats Models with digital brewer control assemblyElectrical Requirements Plumbing RequirementsInitial SET-UP Adjusting Brew VolumesElectro/mechanical brewers Start Switch CleaningBrew Selector Switch Operating ControlsTroubleshooting Problem Probable Cause RemedyBrew cycle will not start Troubleshooting ProblemOverflow protection switch Digital Brewer Control Assem- bly DBCTroubleshooting Problem Probable Cause Remedy Sprayhead or airvent Mechanical Triac assembly DBCWarmer element StepTimer adjustment Time adjustment ElectroDBC volume 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 ThermostatThree wire 120/240 volt models Service ON/OFF Warmer SwitchBlack wire from the center terminal 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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