Bunn TU3Q service manual Digital Timer Wiring

Page 18

SERVICE (cont.)

DIGITAL BREW TIMER (Late Models) (cont.)

To increase a brew volume, place the ON/OFF switch in the ÒONÓ position, press and hold the START switch until three clicks are heard. Release the switch and press it again one or more times. (Failure to re- lease the switch within two seconds after the third click causes the volume setting to be aborted and pre- vious volume setting will remain in memory.) Each time the switch is pressed, two seconds are added to the brew time period. Allow the brew cycle to finish in order to verify that the desired volume has been achieved.

To decrease a brew volume, place the ON/OFF switch in the ÒONÓ position, press and release the START switch once for every two-second interval to be removed from the total brew time period; then im- mediately press and hold down the START switch until three clicks are heard. Release the switch. (Failure to release the switch within two seconds after the third click causes the volume setting to be aborted and pre- vious volume setting will remain in memory). Allow the brew cycle to finish in order to verify that the de- sired volume has been achieved.

2.Setting brew volumes. To set a brew volume, first check that the SET/LOCK switch is in the ÒSETÓ posi- tion on the circuit board. Place the ON/OFF switch in the ÒONÓ position, press and hold the START switch until three distinct clicks are heard and then release the switch. (Failure to release the switch within two seconds after the third click causes the volume set- ting to be aborted and previous volume setting will remain in memory.)

View the level of the liquid being dispensed. When the desired level is reached, turn the ON/OFF switch to ÒOFFÓ.

NOTE: Several ounces of water will continue to sy- phon from the tank after turning the switch ÒOFFÓ. The brewer remembers this volume and will continue to brew batches of this size until the volume setting procedure is repeated.

NOTE: When brewing coffee, volume will decrease due to absorption by the coffee grounds.

3.Setting programming disable feature. If it becomes necessary to prevent anyone from changing brew time once programmed, you can set the SET/LOCK switch to the ÒLOCKÓ position. This will prevent any further programming until switch is once again put into the ÒSETÓ position.

TL1 - WHI to Power Cord (100V & 120V) or

 

RED to Power Connector (230V) and

 

WHI to On/Off Switch (100V & 120V) or

 

RED to On/Off Switch (230V)

 

TL2 - WHI/VIO to Brew Solenoid and

 

WHI/VIO to On/Off Switch

 

TL3 - WHI/ORN to Start Switch

 

TL4 - WHI/GRN to Brew Solenoid

 

TL5 - WHI/YEL to Start Switch

P2037

FIG. 7 DIGITAL TIMER WIRING

Page 18

10288

071000

 

 

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Contents TU3Q Phone 217 529-6601 FAX 217Contents BUNN-O-MATIC Commercial Product WarrantyIntroduction User Notices #00831.0000 #00656.0000#03408.0002 #03409.0002 #03408.0000 #03536.0000 #03409.0000 Electrical Requirements Plumbing RequirementsElectrical Hook-Up Initial SET-UP Auto Sweetener SET-UPAdjusting Brew Volumes Auto Sweetener SET-UPCleaning Auto Sweetener CleaningOperating Controls TEA Brewing Troubleshooting Problem Probable CauseRemedy Probable Cause TroubleshootingProblem RemedyProblem Probable Cause Syphon System Lime Build-up Beverage overflows dispenser Brew TimerDripping from sprayhead DispenserProblem Probable Cause Remedy Service Component AccessBrew Solenoid Valve ServiceTest Procedures Disconnect the brewer from the power source Solenoid valveBrew Timer Early Models Wiring Diagram and check the wiring harnessService Digital Brew Timer Late Models If voltage is as described, proceed to #7Digital Timer Wiring Control Thermostat Control ThermostatLimit Thermostat Limit ThermostatSwitch terminals ON/OFF SwitchRefer to when reconnecting the wires Location On the switch terminalStart Switch Start SwitchTank Heater Sweetener Solenoid Valve Optional OFF/SELECTOR Switch Schematic Wiring Diagram TU3Q Volts AC 2 Wire Single PhaseWire Volts AC
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