Bunn HC-3 service manual Service, Component Access, Contents, Auger Drive Components

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SERVICE

This section provides procedures for testing and replacing various major components used in this dispenser should service become necessary. Refer to Troubleshooting for assistance in determining the cause of any problem.

WARNING - Inspection, testing, and repair of electri- cal equipment should be performed only by qualified service personnel. The dispenser should be un- plugged when servicing, except when electrical tests are required and the test procedure specifically states to plug-in the dispenser.

COMPONENT ACCESS

WARNING - Disconnect the dispenser from the power source before the removal of any panel or the replace- ment of any component.

All components are accessible by opening the door, removal of the door covers, reflector, dispenser top covers, left and right side covers.

Refer to the contents listing for component loca- tion.

Contents

 

Auger Drive Components

12

Auger Motor

14

Ballast

15

Control Thermostat

16

Dispense Switch

18

Fan

19

Frother

20

Hopper Delay Board

22

Hot/Cold Switch

23

Lamp Holder

24

Lamp

24

Lamp Starter and Socket

25

Level Control Board and Level Probe

26

Limit Thermostat

27

Overflow Protection Switch

28

Rinse/Run Switch

29

Solenoid (Cold Drink - Optional)

30

Solenoid (Dispense)

31

Solenoid (Inlet)

32

Tank Heater

33

Tank Heater Switch

34

Transformer (240V Models Only)

35

Whipper Motor

20

Wiring Diagrams

37 & 38

AUGER DRIVE COMPONENTS

FIG. 1 AUGER DRIVE COMPONENTS P1199.45 Location

The auger components are located inside the bottom part of the hopper except for the auger drive bracket, washer and locknut, which are located on the outside bottom rear of the hopper. The auger motors are located on the rear of the front panel. Refer to Fig. 2 for disassembly and assembly.

Test Procedures - Auger motors

1.Disconnect the dispenser from the power source.

2.Disconnect the wires from the motor to be tested.

3.Check the voltage across the white/violet wire for the right motor, white/blue wire for the center motor or the white/red wire for the left motor and the white/black wire with a voltmeter. Press and hold the appropriate Dispense switch. Connect the dispenser to the power supply. The indication must be :

a)120 volts ac for two wire 120 volt models.

b)120 volts ac for three wire 120/208 volt or 120/ 240 volt models.

c)240 volts ac for two wire 240 volt models.

4.Disconnect the dispenser from the power supply.

12

27591 031597

 

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Contents Bunn HC-2 Serial # HC00025000 UPWarranty IntroductionUser Notices 12368.000227620.0000 Initial SET-UP Electrical RequirementsElectrical HOOK-UP Plumbing RequirementsCleaning AdjustmentsDispenser USE Cold Beverage SET-UP OptionalTroubleshooting Draining the HOT Water TankHopper Dispense Rate of Product Troubleshooting Problem Probable Cause RemedyProblem Problem Probable Cause Dripping from dispense tip Lime build-upOn stainless steel surfaces can Ing in serious leaksWeak product Water temperature Testing procedure. See30 or Tip with a thermometerTroubleshooting Problem Probable Cause RemedyService Component AccessContents Auger Drive ComponentsAuger Drive Components If voltage is present as described, proceed to #5Washer Auger Motor Locknut Dust Seal Shoulder Screw Hopper AssyService Right HC-2Test Procedure BallastLocation Remove temperature probe from the tank Control ThermostatLocation Mechanical Thermostat Electronic Thermostat OptionalControl Thermostat Thermostat TerminalsDispense Switch Dispense SwitchTest Procedures FANFrother and Whipper Motor Steam Collector #6-32 Screw Mixing ChamberRing 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- nalsLamp Replacement Refer to Fig Lamp HolderDoor Assy 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 Valves Dispense Disconnect the water line from the solenoid valveSolenoid Valve Inlet Solenoid Valve Inlet Tank HeaterRefer to when reconnecting the wires to the tank heater Tank Heater SwitchTank Heater Tank Heater Switch Tank Heater Switch TerminalsTransformer 240V TWO Wire MODELSONLYcontSchematic Wiring Diagram HC-2, & HC-3 Schematic Wiring Diagram HCA-2, & HCA-3
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