SERVICE (cont.)

DIGITAL BREWER CONTROL BOARD AND DISPLAY (DBC)

FIG. 12 DIGITAL CONTROL BOARD

P1094.35

Location

The digital control board is located inside the upper front of the trunk on the component bracket.

The digital display is located in the upper center of the front of hood.

the following functions are set properly.

A)set refill probe delay (larger values add more delay time)

B)refill sensing probe ("no" means that there will be no automatic refill)

C)refill solenoid separate from brew solenoid (usually on gravity brewers) ("no" means that refill will occur automatically only when not brewing.

D)set refill resistance threshold (only necessary to change in pure water areas)(changing the set- ting to a value higher than 128 means the water will be more likely to create a full condition).

E)check wiring to refill solenoid

F)replace Digital Brewer Control Board

3.If the brewer will not heat then check the follow- ing.

A)test the main tank heater

B)check the main brew tank temperature setting

C)check dry plug-in prevention probe setting ("yes" means that there must be a dry plug-in prevention probe)

D)limit thermostat on top of the brewer tank

E)temporarily substitute a known working heater triac assembly

F)replace Digital Brewer Control Board

NOTE: Check the function list (supplied) for FUNC-

TION, ENTRY AND DESCRIPTION.

1.If display indicates a "FAULT" use the list below to troubleshoot the indicated fault.

FAULT 1 - main brew tank temperature probe is shorted

FAULT 2 - main brew tank temperature probe is open circuit

FAULT 3 - secondary water tank temperature probe is shorted (used only in two-tank system) FAULT 4 - secondary water tank temperature probe is open circuit (used only in two-tank sys- tem)

FAULT 5 - main DBC board is defective

FAULT 6 - water overflow protection switch is open circuit

FAULT 7 - dry plug-in condition (brewer is look- ing for connection between the water tank and the dry plug-in probe.

2.If the brewer will not refill then use the function list and test the refill solenoid and make sure that

4.If the brewer will not brew then use the function list and test the brew solenoid and make sure that the following functions are set properly.

A)set main brew tank temperature ( a setting that is lower than the ready lamp value can prevent brewing)

B)set main brew tank - ready lamp off temperature (a setting that is higher than the brew value can prevent brewing)

C)select brew lockout ("yes" requires the brewer ready lamp to be "ON" in order to brew)

D)replace Digital Brewer Control Board

5.If the temperature reading on the display is higher than 211˚F (99˚C), disconnect the two pin connec- tor (blue wire and tan wire) from the heater triac. If the heater remains on, the heater triac is defec- tive and must be replaced.

6.If the temperature on display varies by more than one degree while the brewer is at idle, select main

Page 22

27362

092996

 

 

Page 21 Page 23
Page 22
Image 22
Bunn System III manual Digital Brewer Control Board and Display DBC, TION, Entry and Description
Page 21 Page 23

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