Bunn HC-3 service manual Control Thermostat, Thermostat Terminals

Page 17

SERVICE (cont.)

CONTROL THERMOSTAT (cont.)

Removal and Replacement.

Mechanical Thermostat

1.Disconnect the wires from the thermostat.

2.Remove the thermostat capillary bulb by firmly pulling-up on the capillary at the tank lid. This will disengage the grommet from the tank lid.

3.Remove the #8-32 screw securing the thermo- stat to the rear panel.

4.Slide the thermostat off of the guide stud on the rear panel and discard.

5Slide new thermostat over the guide stud on rear panel.

6.Secure the thermostat to the rear panel using a #8-32 screw.

7.Slide the grommet to the line 4.5” above the bulb on the new capillary tube.

8.Insert the capillary bulb through the hole in the tank lid and press the grommet firmly and evenly so that the groove in the grommet fits into the tank lid.

9.Carefully bend the capillary tube so that the tube and bulb inside the tank are in the vertical posi- tion and away from any electrical connections.

10.Refer to the illustration below and reconnect the wires.

NOTE - The capillary tube must be clear of any electri- cal termination and not kinked.

Electronic Thermostat (Optional)

1.Disconnect the wires from the thermostat.

2.Remove the two #8-32 keps nuts securing the thermostat to the dispenser base.

3.Remove the temperature probe from the grom- met in the tank lid.

4.Remove thermostat and discard.

5.Install new thermostat over the studs on the dis- penser base and secure with two #8-32 keps nuts.

6.Push the temperature probe into the grommet in the tank lid until the top of the tube is flush with grommet.

7.Refer to the illustration below and reconnect the wires.

BLK to Limit Thermostat

BLK to Limit

Thermostat

BLU to Tank

TAN to Tank

Heater Switch

Heater

 

Switch

 

BLK to Terminal

 

Block

 

WHI to Terminal

 

Block

MECHANICAL

ELECTRONIC

FIG. 7 THERMOSTAT TERMINALS

P1204

 

17

27591 031597

 

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Contents Serial # HC00025000 UP Bunn HC-2Introduction Warranty27620.0000 User Notices12368.0002 Electrical Requirements Initial SET-UPElectrical HOOK-UP Plumbing RequirementsAdjustments CleaningDispenser USE Cold Beverage SET-UP OptionalHopper Dispense Rate of Product TroubleshootingDraining the HOT Water Tank Problem Probable Cause Remedy TroubleshootingProblem Dripping from dispense tip Lime build-up Problem Probable CauseOn stainless steel surfaces can Ing in serious leaksTesting procedure. See Weak product Water temperature30 or Tip with a thermometerProbable Cause Remedy Troubleshooting ProblemComponent Access ServiceContents Auger Drive ComponentsIf voltage is present as described, proceed to #5 Auger Drive ComponentsWasher Auger Motor Locknut Dust Seal Shoulder Screw Hopper AssyRight HC-2 ServiceLocation Test ProcedureBallast Control Thermostat Remove temperature probe from the tankLocation Mechanical Thermostat Electronic Thermostat OptionalThermostat Terminals Control ThermostatDispense Switch Dispense SwitchFAN Test ProceduresSteam Collector #6-32 Screw Mixing Chamber Frother and Whipper MotorRing Pull the mixing chamber 2 out of the whipper chamberWhipper Motor Terminals Frother and Whipper MotorReconnect the eight pin connector to the hopper delay board Hopper Delay BoardDisconnect the wires from the switch termi- nals HOT/COLD Switch OptionalDoor Assy Lamp Replacement Refer to FigLamp Holder Service Level Control Board and Probe Level Control Board and Level ProbeLimit Thermostat Level Board TerminalsOverflow Protection Switch Overflow Protection SwitchRUN/RINSE Switch RUN/RINSE SwitchCold Water Solenoid Valve Solenoid Valve Cold Water OptionalSolenoid Valves Dispense Cold Water Solenoid TerminalsSolenoid Valve Inlet Solenoid Valves DispenseDisconnect the water line from the solenoid valve Tank Heater Solenoid Valve InletTank Heater Refer to when reconnecting the wires to the tank heaterTank Heater Switch Tank Heater Switch Terminals Tank Heater SwitchMODELSONLYcont Transformer 240V TWO WireSchematic Wiring Diagram HC-2, & HC-3 Schematic Wiring Diagram HCA-2, & HCA-3
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