Bunn dispenser service manual If voltage is present as described, proceed to #5

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SERVICE (cont.)

CONTROL BOARD and LEVEL PROBE

P1925

FIG. 11 CONTROL BOARD

Location:

The control board is located behind the rear panel, mounted on the back side of the hopper motor mount- ing panel.

Test Procedure:

Liquid Level Control

1.Disconnect the dispenser from the power source.

2.Disconnect the twelve pin connector (J1) from the control board.

3.Check the voltage across pins 2 & 3 of the twelve pin connector on the wiring harness with a voltmeter. Connect the dispenser to the power source and select the "ON" position of the main power switch. The indication must be 24 volts ac.

4.Select the "OFF" position of the main power switch and disconnect the dispenser from the power source.

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

If voltage is not present as described, refer to the wiring diagram and check the dispenser wiring harness.

5.Reconnect the twelve pin connector to the control board (J1).

6.Disconnect the four pin connector (J7) from the control board.

7.Check the voltage across pins 1 & 3 of the four pin connector on the wiring harness with a voltmeter. Connect the dispenser to the power source and select the "ON" position of the main power switch. The indication must be:

a)120 volts ac for 120 volt models.

b)230 volts ac for 230 volt CE models.

8.Select the "OFF" position of the main power switch and disconnect the dispenser from the power source.

If voltage is present as described, proceed to #9.

If voltage is not present as described refer to the wiring diagram and check the dispenser wiring harness.

9.Reconnect the four pin connector to the control board (J7).

10.Disconnect the twelve pin connector (J1) from the control board.

11.Measure the resistance between pins 8 & 12 of the twelve pin connector on the wiring harness using an ohmmeter. The indication must be between 298k ohms and 304k ohms.

If the resistance measures as described, proceed to #12.

If the resistance does not measure as described, refer to the wiring diagram and check the dispenser wiring harness.

12.Carefully connect a piece of insulated jumper wire to the level probe contact pin (pink wire) located at the lower left rear of the dispenser.

13.Check the voltage across the terminals, first of the dispense solenoid and then of the hopper motor with a voltmeter. Connect the dispenser to the power source and select the "ON" position of the main power switch. The indication must be:

a)120 volts ac for 120 volt models.

b)230 volts ac for 230 volt CE models.

at the dispense solenoid and between 4 and 26 volts dc at the hopper motor after a delay of approxi- mately 10 seconds.

14.Touch the free end of the jumper wire to the dispenser housing. The indication must be 0 (zero) after a delay of up to 5 seconds.

15.Move the jumper wire away from the housing. The indication must again be:

a)120 volts ac for 120 volt models.

b)230 volts ac for 230 volt CE models.

at the dispense valve solenoid and between 4 and 26 volts dc at the hopper motor after a delay of up to 5 seconds.

16.Disconnect the dispenser from the power source, remove the jumper wire, and select the "OFF" posi- tion on the main power switch.

If voltage is present as described, The liquid level control circuitry is operating properly.

If voltage is not present as described, replace the control board.

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29793.1 021202

 

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Contents Bunn Powder Auto Fill Post Office BOX SPRINGFIELD, IllinoisBUNN-O-MATIC Commercial Product Warranty IntroductionInitial SET-UP User Notices34561.0000 Operating Instructions Adjustments Cleaning Recommended Daily Cleaning and Maintenance TipsRinse and dry each item thoroughly before reas- sembling Dispense Fault ListNormal operation Powder Auto-Fill ready to Door not closedTroubleshooting Problem Probable CauseProblem RemedyPowder Auto-Fill hopper not in- stalled properly Transformer Control Board and ProbeAuger Drive Water Strainer OptionalProblem Probable Cause Remedy Service Component AccessRetainer Clip Auger Drive ComponentsHopper Lid Spacer Dust Seal Hopper BaseDiagrams and check wiring harness Auger Drive MotorFrother and MIXING/WHIPPER Chamber Mixing ChamberWhipper Motor Volts ac for 120 volt models Volts ac for 230 volt CE modelsInstall dispense tip into the bottom of the whipper chamber Whipper MotorIf voltage is present as described, proceed to #5 If voltage is present as described, proceed to #9Test Procedure Low Product Detect Instal the new control board using the four #6-32 keps nuts Remove the control boardTEST/SERVICE Switch Disconnect the wires from the switch terminalsLocation Main Power ON/OFF Switch Main Power ON/OFF SwitchLamp Cord Assembly Refer to when reconnecting the wiresLamp Cord Connector Disconnect the lamp cord from the lamp cord connectorRemove new nut and washer from new lamp cord connector Lamp HOLDER/SOCKET Assembly Close the dispenser doorTransformer TransformerPotentiometer PotentiometerHopper Level Indicator Hopper Level IndicatorHopper Switch Hopper SwitchDoor Switch Door SwitchAdjustments Pressure Regulator and Needle ValveDispense Solenoid Valve Dispense Solenoid Valve LocationWiring Diagrams Schematic Wiring Diagram PAFSchematic Wiring Diagram Pafa

dispenser specifications

The Bunn dispenser is a highly regarded name in the beverage service industry, known for its reliable coffee brewers, steeping equipment, and beverage dispensing solutions. These dispensers are designed with efficiency and quality in mind, making them a favorite in restaurants, cafes, and other foodservice establishments.

One of the main features of the Bunn dispenser is its rapid brewing capability. Utilizing a unique brewing system, Bunn dispensers can quickly brew large quantities of coffee, which is essential for high-demand environments. The machines are equipped with advanced heating technology that ensures water is brewed at the optimal temperature for extracting the best flavors from coffee grounds. This feature not only enhances the quality of the beverage but also significantly reduces waiting times for customers.

Another key characteristic of Bunn dispensers is their durability. Built with high-quality materials, these machines are designed to withstand the rigors of a busy kitchen environment. The robust construction ensures a long lifespan, minimizing the need for frequent repairs or replacements. Additionally, many models feature stainless steel components that are resistant to corrosion and easy to clean, maintaining hygiene standards while also looking professional.

Bunn dispensers are also known for their versatility. With a range of models available, including single and multi-hopper options, they can dispense various beverages, including coffee, tea, and iced drinks. This flexibility allows businesses to cater to different customer preferences without requiring multiple machines. Moreover, Bunn dispensers often come with programmable features, enabling users to customize brew strengths and volumes for optimal beverage consistency.

In terms of technology, Bunn has incorporated advanced digital controls and user interfaces in many of its models. These digital displays simplify operation, allowing staff to monitor brewing processes and receive alerts for maintenance requirements efficiently. Such technological integration enhances user experience and operational efficiency.

Energy efficiency is another consideration in the design of Bunn dispensers. Many models are equipped with energy-saving features, which help reduce power consumption during both operation and standby modes. This focus on sustainability not only lowers utility costs for businesses but also aligns with the growing consumer demand for environmentally responsible practices.

In conclusion, Bunn dispensers combine speed, durability, versatility, advanced technology, and energy efficiency, making them an excellent choice for any foodservice operation. Their ability to deliver high-quality beverages quickly and consistently makes them a pivotal asset for businesses aiming to provide an exceptional customer experience.