Bunn 41722.0000A manual BREW/DILUTION Timer TB3 & TB6

Page 18

SERVICE (cont.)

BREW/DILUTION TIMER (TB3 & TB6)

FIG. 18-1 BREW/DILUTION 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 BREW output voltage across terminals TL2 and TL4; and the DILUTION output voltage across terminals TL2 and TL6. 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, disconnect the brewer from the power source and 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.

SW1

J-1

TRM-1

TRM-2

TRM-3

TRM-4

TRM-5

TRM-6

J-4

FIG. 18-2 TIMER TERMINALS

Terminals:

J-1 ½ batch connector

J-4 Dilution delay time 1-2 (NORMAL), 3-4 (2x) SW-1 Programming Enable/Disable

TRM-1 White/Violet

L1 in 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

TRM-6

White/Blue

Dilution solenoids

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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 Probable Cause Remedy Brew cycle will not start No waterTo the brewer Probable Cause ProblemBrew cycle will not start Water is not hot Control Thermostat Tank HeaterReactions resulting in serious Inconsistent beverage levelSurfaces can initiate corrosive LeaksRefer to Service Timer for test- ing procedures Spitting or excessive steaming Dripping from sprayheadBeverage overflows dispenser Dry coffee grounds remain Funnel Brewer is making unusal noisesPlumbing Lines Water Supply Problem Probable Cause Remedy Brewer is making unusal noises Tank HeaterCont Tank heater Component Access Control ThermostatLocation Control thermostat is located in the hood Disconnect the control thermostat wires Adjust the control thermostat as requiredRemove all wires from limit thermostat termi- nals Limit ThermostatDisconnect the brewer from the power supply Tank Heater1680W-120V 1680W-100V 1680W-230V 29.0 33.7 Lighted ON/OFF Switch TB3/TB3Q Refer to -2 when reconnecting the wiresOrange light Switch Switch is located on the front control panelThrough four when the switch is in the oposite Position If continuity is present as described, replace the wiresStart Switches 37080.0001to T. StatInlet Valves BREW/DILUTION Timer TB3 & TB6 BREW/DILUTION Timer Triacs Triacs TH-1/MV-1 Brew solenoid TH-2/MV-2 Dilution solenoidDigital Brew Timer TB3Q & TB6Q Terminals ½ batch connectorWhite Red Neutral L2 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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