Bunn 41722.0000A manual Digital Brew Timer TB3Q & TB6Q, Terminals ½ batch connector

Page 20

SERVICE (cont.)

DIGITAL BREW TIMER (TB3Q & TB6Q)

FIG. 20-1 DIGITAL TIMER

Location:

The timer is located in left side of the hood.

Test Procedure

NOTE: Do not remove or install wires while timer board is installed. Pressure applied to one side may cause damage to the board.

1.Disconnect the brewer from the power source and remove the top cover.

2.With a voltmeter, check the supply voltage across terminals TL1 and TL2. Connect the brewer to the power source. Turn on the "ON/OFF" switch. The voltage must be:

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

b)200 to 230 volts ac on two wire 200 volt or 230 volt models.

3.Disconnect the brewer from the power source.

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

If voltage is not present as described, refer to the Wir- ing Diagrams and check the wiring harness.

4.With a voltmeter, check the output voltage across terminals TL1 and TL4. Connect the brewer to the power source, turn on the "ON/OFF" switch and press the "START" switch. The voltage must be:

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

b)200 to 230 volts ac for two wire 200 volt or 230

volt models.

If voltage is present as described, the timer is operat- ing properly. If voltage is not present as described, proceed to #5.

5.With a voltmeter, check the input start voltage across terminals TL2 and TL5. Connect the brewer

to the power source, turn on the "ON/OFF" switch and press the "START" switch. The indication must be as follows:

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

b)200 to 230 volts ac on two wire 200 volt or 230 volt models.

If voltage is not present as described, refer to the Wiring Diagrams and check the wiring harness to the start switch.

If start voltage is present as described (but no output voltage), replace the timer.

Removal and Replacement:

1.Remove the two #6-32 screws, lock washers and spacers securing timer to bracket.

2.Disconnect all wires from the timer.

3.Refer to schematic and reconnect wires.

4.Install new timer to bracket with the two #6-32 screws, lock washers and spacers.

5.Adjust the timer as required.

 

TRM-1

 

TRM-2

SW1

TRM-3

 

J-2

TRM-4

 

J-1

TRM-5

 

FIG. 20-2 DIGITAL TIMER

Terminals:

J-2 ½ batch connector

J-1 Multi batch (NOT USED IN TB SERIES) SW-1 Programming Enable/Disable

TRM-1 White/Violet

L1 from ON/OFF switch

TRM-2

White (Red)

Neutral (L2)

TRM-3

White/Orange

Start switch

TRM-4

White/Green

Brew solenoid

TRM-5

White/Yellow

Start switch

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41722 070209

 

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Contents TB3/TB6 Series Phone 217 529-6601 FAX 217BUNN-O-MATIC Commercial Product Warranty Contents To the brewer Probable Cause RemedyBrew cycle will not start No water Problem Brew cycle will not start Water is not hotProbable Cause Control Thermostat Tank HeaterInconsistent beverage level Surfaces can initiate corrosiveReactions resulting in serious LeaksBeverage overflows dispenser Refer to Service Timer for test- ing proceduresSpitting or excessive steaming Dripping from sprayhead Plumbing Lines Water Supply Dry coffee grounds remainFunnel Brewer is making unusal noises Cont Tank heater Problem Probable Cause RemedyBrewer is making unusal noises Tank Heater Location Control thermostat is located in the hood Component AccessControl Thermostat Disconnect the control thermostat wires Adjust the control thermostat as requiredRemove all wires from limit thermostat termi- nals Limit Thermostat1680W-120V 1680W-100V 1680W-230V 29.0 33.7 Disconnect the brewer from the power supplyTank Heater Orange light Lighted ON/OFF Switch TB3/TB3QRefer to -2 when reconnecting the wires Switch is located on the front control panel Through four when the switch is in the oposite PositionSwitch If continuity is present as described, replace the wiresStart Switches 37080.0001to T. Stat Inlet Valves BREW/DILUTION Timer TB3 & TB6 BREW/DILUTION Timer Triacs Triacs TH-1/MV-1 Brew solenoid TH-2/MV-2 Dilution solenoidWhite Red Neutral L2 Digital Brew Timer TB3Q & TB6QTerminals ½ batch connector Digital Timer Triacs Triacs MV-2 Brew solenoid output MV-1 LineSchematic Wiring Diagram TB3Q Volts AC Wire Single PhaseSchematic Wiring Diagram TB3, TB3B, TB3-LP Schematic Wiring Diagram TB3Q Schematic Wiring Diagram TB3Q W/SWEETENER & Empty BAG Detect Schematic Wiring Diagram TB6 Schematic Wiring Diagram TB6Q
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