Bunn TU3 service manual Dilution Timer

Page 22

SERVICE (cont.)

 

If continuity is present as described, reconnect the

DILUTION TIMER

 

 

wires to terminals TL3, TL4, & TL5 of the timer board

 

 

 

 

 

 

and proceed to #5.

 

 

 

 

 

If continuity is not present as described, refer to the

 

 

 

Wiring Diagrams and check the wiring harness.

 

 

 

 

5. With a voltmeter, check the voltage across termi-

 

 

 

nals TL1 and TL4 when the ON/OFF switch is in

 

 

 

the "ON" position and the start switch is momen-

 

 

 

tarily placed in the lower position. Connect the

 

 

 

brewer to the power source. After a delay of ap-

 

 

 

proximately three minutes, the indication must be:

 

 

 

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

 

 

 

approximately one minute and then return to its

 

 

 

previous indication.

 

 

 

 

 

b) 240 volts ac for two wire 240 volt models for

 

 

 

approximately one minute and then return to its

 

 

 

previous indication.

 

 

 

 

 

c) 100 volts ac for two wire 100 volt models for

 

 

P1276.40

approximately one minute and then return to its

 

FIG. 12 DILUTION TIMER

previous indication.

 

 

 

 

 

 

Location:

 

6. Disconnect the brewer from the power source.

 

 

 

 

 

The dilution timer is located inside the hood on the

If voltage is present as described, the timer is operat-

right side. It consists of the dial plate with two dials

ing properly. Adjust the timer dials as required.

 

and circuit board.

 

 

 

If voltage is not present as described, replace the timer.

 

 

 

Test Procedure:

 

Removal and Replacement:

 

1.

Disconnect the brewer from the power source and

 

1. Remove all wires from the timer.

 

 

remove the wires from terminals TL3, TL4, & TL5

 

 

2. Remove the circuit board and dial plate from the

 

of the timer and rotate both dials fully counter-

 

brackets.

 

 

 

clockwise.

 

 

 

 

 

4. Install the new dial plate and circuit board to the

2. With a voltmeter, check the voltage across termi-

brackets.

 

 

 

nals TL1 and TL2 when the ON/OFF switch is in

 

 

 

5. Refer to Fig. 13 when reconnecting the wires.

 

the "ON" position. Connect the brewer to the power

 

6. Adjust the timer dials as required.

 

 

source. The indication must be:

 

 

 

 

 

 

 

 

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

 

 

 

 

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

WHI/BLU to Dilution Solenoid

GRN to Start Switch

 

 

c) 100 volts ac for two wire 100 volt models.

RED/BLK to Start Switch

 

 

3.

Disconnect the brewer from the power source.

WHI to Brew Timer (100V &

 

 

 

 

 

120V Models)

 

 

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

RED to Brew Timer (240V

 

 

Models)

 

 

If voltage is not present as described, refer to the Wir-

WHI/VIO to ON/OFF Switch

 

 

ing Diagrams and check the wiring harness.

 

GRY to Selector Switch

PNK to Selector Switch

 

 

 

4.

Check for continuity across the green and red/

(Half Batch Option Only)

(Half Batch Option Only)

PNK to Selector Switch

GRY to Selector Switch

 

black wires when the start switch is held in the

(Half Batch Option Only)

(Half Batch Option Only)

 

 

 

 

 

lower position.

 

FIG. 13 DILUTION TIMER TERMINALS

P1281

 

 

 

 

 

 

Page 22

10225

071500

 

 

 

 

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Contents TU3 Phone 217 529-6601 FAX 217BUNN-O-MATIC Commercial Product Warranty ContentsIntroduction #00831.0000 #00656.0000 User Notices#03408.0002 #03409.0002 #03408.0000 #03409.0000 Plumbing Requirements Electrical RequirementsElectrical Hook-Up Initial SET-UP StoppedAuto Sweetener SET-UP Adjusting Brew VolumesInitial SET-UP Cleaning Operating ControlsCleaning Auto Sweetener CleaningTEA Brewing Problem Probable Cause TroubleshootingRemedy Problem TroubleshootingRemedy Problem Probable Cause Remedy Dilution cycle will not start Dilution Solenoid ValveFunnel Tip Spitting or excessive steamingDrip-out time too long Control Thermostat Ticles clogging the drip-out tipBeverage overflows dispenser Dispenser See Dilution TimerIng Water Temperature Dilution Solenoid ValveRemove and clean lime off the tank heater. See Dry tea leaves remain in the funnelComponent Access ServiceContents Brew Solenoid Valve ServiceSolenoid valve Service Brew Timer Early Models Brew TimerService Digital Brew Timer Late Models If voltage is as described, proceed to #7Digital Timer Wiring Control Thermostat Dilution Solenoid Valve Dilution Solenoid ValveDilution Timer Limit Thermostat Indication must beIng Diagrams and check the wiring harness ON/OFF SwitchON/OFF Switch Selector Switch Optionalcont Start Switch Start SwitchSweetener Solenoid Valve Optional Tank Heater 10225 071500 10225 071500 Single Phase Volts AC10225 071500
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TU3 specifications

The Bunn TU3 is a renowned commercial coffee brewer known for its reliability and performance in bustling coffee shops, restaurants, and diners. Designed to cater to high-demand environments, the TU3 stands out with a variety of features that ensure an optimal brewing experience.

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