Bunn HC-2 HC-3 service manual Level Control Board and Level Probe, Level Control Board and Probe

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SERVICE (cont.)

LEVEL CONTROL BOARD AND LEVEL PROBE

P1203.45

FIG. 17 LEVEL CONTROL BOARD AND PROBE

Location:

The level control board is located on the upper right rear of the front panel just in front of the tank.

The Level probe is located on the right center of the tank lid.

Test Procedure:

1.Disconnect the dispenser from the power source.

2.Remove the violet wire from terminal 1 & pink wire from terminal 4 of the circuit board.

3.Check the voltage across terminals 2 & 3 with a voltmeter. Connect the dispenser to the power source. The indication must be 120 volts ac for two wire 120 volt models, three wire 120/208 volt models, three wire 120/240 volt models and 240 volts ac for two wire 240 volt models.

4.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 haness.

5.Reconnect the violet wire to terminal 1.

6.Carefully connect a piece of insulated jumper wire to terminal 4. Keep the other end of this wire away from any metal surface of the dispenser.

7.Check the voltage across terminals 1 & 3 with a voltmeter. Connect the dispenser to the power source. The indication must be 120 volts ac for two wire 120 volt models, three wire 120/208 volt models, three wire 120/240 volt models and 240 volts ac for two wire 240 volt models after a delay of approximately 5 seconds.

8.Touch the free end of jumper wire to the dispenser housing. The indication must be 0.

9.Move the jumper wire away from the dispenser housing. The indication must again be 120 volts ac for two wire 120 volt models, three wire 120/208 volt models , three wire 120/240 volt models and 240 volts ac for two wire 240 volt models after a delay of approximately 5 seconds.

10.Disconnect the dispenser from the power source and remove the jumper wire from terminal 4.

If voltage is present as described, the level control board is operating properly, proceed to #11.

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

11.Reconnect the pink wire to terminal 4.

12.Gently pull the probe out of the tank lid and inspect for corrosion. Replace it if necessary.

13.Place the probe so that neither end is in contact with any metal surface of the dispenser.

14.Check the voltage across terminals 1 & 3 with a voltmeter. Connect the dispenser to the power source. The indication must be 120 volts ac for two wire 120 volt models, three wire 120/208 volt models, three wire 120/240 volt models and 240 volts ac for two wire 240 volt models after a delay of approximately 5 seconds.

15.Move the probe's flat end to the dispenser hous- ing. The indication must be 0.

16.Move the probe's flat end away from the dispenser housing. The indication should again be 120 volts ac for two wire 120 volt models, three wire 120/ 208 volt models, three wire 120/240 volt models and 240 volt ac for two wire 240 volt models.

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Contents BUNNHC-2 Serial # HC00025000 UPWarranty Introduction27620.0000 User Notices12368.0002 Electrical HOOK-UP Initial SET-UPElectrical Requirements Plumbing RequirementsDispenser USE CleaningAdjustments Cold Beverage SET-UP OptionalHopper Dispense Rate of Product TroubleshootingDraining the HOT Water Tank Troubleshooting Problem Probable Cause RemedyProblem On stainless steel surfaces can Problem Probable CauseDripping from dispense tip Lime build-up Ing in serious leaks30 or Weak product Water temperatureTesting procedure. See Tip with a thermometerTroubleshooting Problem Probable Cause RemedyContents ServiceComponent Access Auger Drive ComponentsWasher Auger Motor Locknut Dust Seal Shoulder Screw Auger Drive ComponentsIf voltage is present as described, proceed to #5 Hopper AssyService Right HC-2Location Test ProcedureBallast Location Mechanical Thermostat Remove temperature probe from the tankControl Thermostat Electronic Thermostat OptionalControl Thermostat Thermostat TerminalsDispense Switch Dispense SwitchTest Procedures FANRing Frother and Whipper MotorSteam Collector #6-32 Screw Mixing Chamber Pull the mixing chamber 2 out of the whipper chamberFrother and Whipper Motor Whipper Motor TerminalsHopper Delay Board Reconnect the eight pin connector to the hopper delay boardHOT/COLD Switch Optional Disconnect the wires from the switch termi- nalsDoor Assy Lamp Replacement Refer to FigLamp Holder Service Level Control Board and Level Probe Level Control Board and ProbeLevel Board Terminals Limit ThermostatOverflow Protection Switch Overflow Protection SwitchRUN/RINSE Switch RUN/RINSE SwitchSolenoid Valve Cold Water Optional Cold Water Solenoid ValveCold Water Solenoid Terminals Solenoid Valves DispenseSolenoid Valve Inlet Solenoid Valves DispenseDisconnect the water line from the solenoid valve Solenoid Valve Inlet Tank HeaterTank Heater Refer to when reconnecting the wires to the tank heaterTank Heater Switch Tank Heater Switch Tank Heater Switch TerminalsTransformer 240V TWO Wire MODELSONLYcontSchematic Wiring Diagram HC-2, & HC-3 Schematic Wiring Diagram HCA-2, & HCA-3

HC-2 HC-3 specifications

The Bunn HC-2 and HC-3 are high-performance commercial coffee brewers designed for cafes, restaurants, and institutions that prioritize quality, efficiency, and reliability. Renowned for their exceptional brewing capabilities, both models come with a range of features that cater to the demanding needs of coffee enthusiasts and professionals alike.

One of the core characteristics of the Bunn HC-2 and HC-3 is their brewing technology. These machines utilize a patented steeping mechanism that allows for optimal water temperature and contact time, extracting the finest flavors from the coffee grounds. The precise temperature control, maintained at a consistent level, ensures that every cup of coffee is brewed to perfection. Furthermore, the machines have an impressive brew capacity, with the HC-2 capable of brewing up to 3.8 gallons per hour, while the HC-3 can brew up to 5.3 gallons per hour, making them ideal for high-traffic environments.

Another significant feature of the Bunn HC-2 and HC-3 is their ease of use. The user-friendly interface allows baristas to quickly set brew cycles and adjust brewing parameters to suit different coffee types. Both models are designed with a sleek, ergonomic aesthetic that fits seamlessly into any workspace, while also being built with durable materials to withstand the rigors of daily use.

In terms of efficiency, these brewers come equipped with energy-saving technology. The automatic warmers on both machines adjust the heat output based on the coffee’s temperature, reducing energy consumption without compromising quality. Additionally, the compact design of these units means they occupy minimal counter space, making them suitable for both small and large establishments.

Maintenance is straightforward with the Bunn HC-2 and HC-3, as they feature a self-diagnostic system that alerts users to any potential issues. This feature minimizes downtime and ensures the longevity of the equipment. Furthermore, the brewing components can be easily accessed for cleaning and maintenance.

In summary, the Bunn HC-2 and HC-3 stand out in the commercial coffee brewing market with their advanced brewing technology, high capacity, user-friendly design, energy efficiency, and ease of maintenance. These features make them a preferred choice for anyone looking to deliver high-quality coffee consistently, ensuring that businesses can satisfy even the most discerning coffee drinkers. With Bunn’s commitment to innovation and quality, these brewers continue to set the standard in the coffee equipment industry.
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