Bunn 41722.0000A manual Tank Heater, Disconnect the brewer from the power supply

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SERVICE (cont.)

TANK HEATER

FIG. 13-1 TANK HEATER

Location:

The tank heater is located inside the tank and secured to the tank lid.

Test Procedures:

1.Disconnect the brewer from the power supply.

2.Turn on thermostat. Check the voltage across the black and white wires on 120 volt models or the black and red wires for 200 volt models and 230 volt models with a voltmeter. Connect the brewer to the power source. The indication must be:

a)120 volts ac for two wire 120 volt 20 amp models .

b)200 to 230 volts ac for two wire 200 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 wiring harness.

4.Disconnect the wires from the tank heater termi- nals.

5.Check resistance value across tank heater terminals and compare to chart.

If resistance is present as described, reconnect the wires, the tank heater is ok.

HEATER

RESISTANCE

1680W-120V

7.9

- 9.2

1680W-100V

5.5

-6.4

1680W-230V

29.0

-33.7

TERMINAL TO SHEATH - INFINITE (OPEN)

If resistance is not present as described, replace the tank heater.

NOTE- If any resistance is read between sheath and either terminal, remove and inspect heater for cracks in the sheath.

Removal and Replacement:

1.Disconnect the brewer from the power supply.

2.Disconnect the water supply from the brewer.

3.Disconnect the wires from the limit thermostat.

4.Disconnect the wires from the tank heater termi- nals.

5.Remove sprayhead and the hex nut securing the sprayhead tube to the hood. Set aside for reas- sembly.

6.Remove the six #10 screws securing the tank lid to the tank.

7.Remove the tank lid with limit thermostat, spray- head tube and tank heater.

8Remove the two hex nuts securing the tank heater to the tank lid. Remove tank heater with gaskets

and discard.

9.Install new tank heater with gaskets on the tank lid and secure with two hex nuts.

10.Install tank lid with limit thermostat, sprayhead tube and tank heater using six #10 screws.

11.Secure sprayhead tube to hood using hex nut removed in step 4.

12.Install sprayhead.

15.Reconnect the wires to the limit thermostat and tank heater.

16.Reconnect the water and power supply.

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41722 070209

 

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Contents Phone 217 529-6601 FAX 217 TB3/TB6 SeriesBUNN-O-MATIC Commercial Product Warranty Contents Brew cycle will not start No water Probable Cause RemedyTo the brewer Brew cycle will not start Water is not hot ProblemProbable Cause Control Thermostat Tank HeaterSurfaces can initiate corrosive Inconsistent beverage levelReactions resulting in serious LeaksSpitting or excessive steaming Dripping from sprayhead Refer to Service Timer for test- ing proceduresBeverage overflows dispenser Funnel Brewer is making unusal noises Dry coffee grounds remainPlumbing Lines Water Supply Brewer is making unusal noises Tank Heater Problem Probable Cause RemedyCont Tank heater Control Thermostat Component AccessLocation Control thermostat is located in the hood Adjust the control thermostat as required Disconnect the control thermostat wiresLimit Thermostat Remove all wires from limit thermostat termi- nalsTank Heater Disconnect the brewer from the power supply1680W-120V 1680W-100V 1680W-230V 29.0 33.7 Refer to -2 when reconnecting the wires Lighted ON/OFF Switch TB3/TB3QOrange light Through four when the switch is in the oposite Position Switch is located on the front control panelSwitch If continuity is present as described, replace the wires37080.0001to T. Stat Start SwitchesInlet Valves BREW/DILUTION Timer TB3 & TB6 Triacs TH-1/MV-1 Brew solenoid TH-2/MV-2 Dilution solenoid BREW/DILUTION Timer TriacsTerminals ½ batch connector Digital Brew Timer TB3Q & TB6QWhite Red Neutral L2 Triacs MV-2 Brew solenoid output MV-1 Line Digital Timer TriacsVolts AC Wire Single Phase Schematic Wiring Diagram TB3QSchematic 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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