Service, Component Access | Bunn TU3Q guide

SERVICE

This section provides procedures for testing and replacing various major components used in this brewer 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 brewer should be disconnected from the power source when servicing, except when electrical tests are required and the test procedure spe- cifically states to plug-in the brewer.

COMPONENT ACCESS

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

All components are accessible by the removal of the top cover and rear inspection panel.

The top cover is attached with four #6-32 screws. Removal of the top cover will allow access to ON/OFF (UNSWEET/OFF/SWEET) switch, START switch, brew timer, brew solenoid, control thermostat, limit ther- mostat and tank heater.

Contents
Brew Solenoid Valve	15
Brew Timer (Early Models)	16
Digital Brew Timer (Late Models)	17
Control Thermostat	19
Limit Thermostat	20
ON/OFF Switch	21
Start Switch	22
Tank Heater	23
Sweetener Solenoid Valve	24
OFF/SELECTOR Switch (Sweetener Option)	25
Wiring Diagrams	26

FIG. 1 COMPONENT ACCESS	P2092.40

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Bunn TU3Q service manual Service, Component Access

Contents

TU3Q Phone 217 529-6601 FAX 217 Introduction ContentsBUNN-O-MATIC Commercial Product Warranty #03408.0002 #03409.0002 #03408.0000 #03536.0000 #03409.0000 User Notices#00831.0000 #00656.0000 Electrical Hook-Up Electrical RequirementsPlumbing Requirements Initial SET-UP Auto Sweetener SET-UP Adjusting Brew Volumes Auto Sweetener SET-UP Operating Controls CleaningAuto Sweetener Cleaning TEA Brewing Remedy TroubleshootingProblem Probable Cause Probable Cause TroubleshootingProblem Remedy Problem Probable Cause Syphon System Lime Build-up Beverage overflows dispenser Brew TimerDripping from sprayhead Dispenser Problem Probable Cause Remedy Service Component Access Brew Solenoid Valve ServiceTest Procedures Disconnect the brewer from the power source Solenoid valve Brew Timer Early Models Wiring Diagram and check the wiring harness Service Digital Brew Timer Late Models If voltage is as described, proceed to #7 Digital Timer Wiring Control Thermostat Control Thermostat Limit Thermostat Limit Thermostat Switch terminals ON/OFF SwitchRefer to when reconnecting the wires Location On the switch terminal Start Switch Start Switch Tank Heater Sweetener Solenoid Valve Optional OFF/SELECTOR Switch Schematic Wiring Diagram TU3Q Volts AC 2 Wire Single Phase Wire Volts AC