Bunn System III manual Warmer Element

Page 37

SERVICE (cont.)

 

 

 

WARMER ELEMENT

 

4.

Disconnect wires from the warmer element.

 

 

 

 

5.

Check the continuity across the two terminals on

 

 

 

the warmer element.

 

 

If continuity is present as described, reconnect the

 

 

white or red wire and white/red wires, or the white or

 

 

red wire and white/violet wires on the warmer element.

 

 

If continuity is not present as described, replace the

 

 

warmer element.

 

 

Removal and Replacement:

 

 

1.

Remove the four #6-32 screws securing the base

 

 

 

(warmer) plate to the brewer housing.

 

 

2.

Turn base plate over and disconnect the two wires

 

 

 

from the warmer element.

 

 

3.

Remove the #8-32 Keps nut, warmer retainer plate

 

 

 

and warmer element. Discard warmer element.

 

 

4.

Place new warmer element on the center bottom

 

 

 

of the base plate with the warmer terminals point-

 

 

 

ing up and to the rear of the base plate.

 

 

5.

Install warmer retainer plate and warmer element

FIG. 33 WARMER ELEMENT

P1111.35

 

over the stud in bottom of the base plate, secure

 

with #8-32 Keps nut.

 

 

Location:

 

6.

Reconnect the two wires to warmer element termi-

 

 

nals.

The warmer element is located on the bottom the

 

7.

Turn base plate over and reinstall with four #6-32

base (warmer) plate.

 

 

 

screws to the brewer housing.

 

 

 

Test Procedures:

 

8.

Refer to Fig. 34 when reconnecting wires.

 

 

 

1.Disconnect the brewer from the power source.

2.On 120/208V or 120/240V models, with a voltme- ter, check the voltage across the white wire and the white/violet wire or white/red wire to the ele-

ment with the "ON/OFF (Warmer)" switch in the

 

 

 

 

WHI/VIO to ON/OFF Switch (Electro/Mechanical)

"ON" (upper) position. On 200V or 240V models,

 

 

 

 

with a voltmeter, check the voltage across the red

 

 

 

 

WHI/RED to ON/OFF Switch (DBC)

 

 

 

 

 

 

 

 

 

 

 

 

wire and the white/violet wire or white/red wire

 

 

 

 

 

 

 

 

with the "ON/OFF (Warmer)" switch in the "ON"

 

 

 

 

 

 

WHI to Terminal Block (120/208V or 120/

(upper) position. The indication must be:

 

 

 

 

 

 

240V Brewers)

 

 

 

 

 

a.)120 volts ac for three wire 120/208 volt models

 

 

 

 

 

 

RED to Terminal Block (200V or 240V

 

 

 

 

 

 

Brewers

and three wire 120/240 volt models.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

b.) 200 to 240 volts ac for two wire 200 or 240 volt

 

 

 

 

 

 

 

 

models.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3. Disconnect the brewer from the power source.

 

 

 

 

 

 

 

 

If voltage is present as described, proceed to #4.

P1110

If voltage is not present as described, refer to theFIG. 34 WARMER ELEMENT TERMINALS Wiring Diagrams and check brewer wiring harness.

Page 37

27362

092996

 

 

Page 36 Page 38
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Page 36 Page 38
Contents Bunn Warranty 20201.5600 00831.0000 00656.0000 03408.0000 03409.0000 User NoticesElectrical Requirements Models with digital brewer control assemblyModels with electro/mechanical thermostats Plumbing RequirementsInitial SET-UP Adjusting Brew VolumesElectro/mechanical brewers Brew Selector Switch CleaningStart Switch Operating ControlsProblem Probable Cause Remedy TroubleshootingOverflow protection switch Troubleshooting ProblemBrew cycle will not start Digital Brewer Control Assem- bly DBCTroubleshooting Problem Probable Cause Remedy Warmer element Triac assembly DBCSprayhead or airvent Mechanical StepDBC volume adjustment Time adjustment ElectroTimer adjustment Procedures. See page 34 orTroubleshooting Problem DBC display is blank Digital brewer control Cannot access the DBC Digital brewer controlComponent Access ServiceContents Bypass Valve ServiceLocation ServiceELECTRO/MECHANICAL Brew Selector SwitchGently remove the capillary bulb and grommet from the tank Contactor Assembly ELECTRO/MECHANICAL onlyContactor Assembly Terminals Service Contactor Assembly ELECTRO/MECHANICAL onlyOnly Test Procedures Disconnect the brewer from the power sourceElectromechanical Dispense ValveTION, Entry and Description Digital Brewer Control Board and Display DBCService Digital Brewer Control Board and Display DBC TRIAC/HEAT Sink TRIAC/HEAT Sink Assembly DBC onlyP2231.30 Terminals Limit Thermostat Limit ThermostatBlack wire from the center terminal Service ON/OFF Warmer SwitchThree wire 120/240 volt models ModelsTest Procedure Disconnect the brewer from the power source Overflow Protection SwitchRefill Solenoid Valve Service Solenoid Valve RefillRefill Solenoid Terminals Start Switch Location Tank HeaterTimer ELECTRO/MECHANICAL Onlyearly Models If voltage is as described, proceed to #7 Digital Timer ELECTRO/MECHANICAL only Late ModelsDigital Timer Wiring Timer SettingWarmer Element Lower 27362 092900 Lower

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.

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