Bunn TWIN service manual Tank Heaters

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SERVICE (cont.)

TANK HEATERS

P1855

FIG. 13 TANK HEATER

Location:

The tank heaters are located inside the tanks and secured to the tank bottoms.

Test Procedures:

1.Disconnect the brewer from the power supply.

2.With a voltmeter, check the voltage across the red wire from the terminal block and the black wire from the control board. Connect the brewer to the power source. The indication must be 240 volts ac.

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 Wiring Diagrams and check wiring harness.

4.Disconnect the black wire and the red wire from the tank heater terminals.

5.Check for continuity across the tank heater termi- nals.

If continuity is present as described, reconnect the wires, the tank heater is operating properly.

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

NOTE- If the tank heater remains unable to heat, remove and inspect heater for cracks in the sheath.

Removal and Replacement:

1.Remove the top cover or top warmer housing and front access panel as previously described.

2.Disconnect the vent hose from the top of the tank by pulling the elbow fitting from the grommet in the top of the tank lid.

3.Drain water from the tank.

4.Disconnect the water supply tube to the dispense valve from the side of the tank.

5.Disconnect the water supply tube to the solenoid valve from the bottom of the tank.

6.If removing the left tank, on brewers with faucet, disconnect the outlet water line to the faucet from the side of the tank.

7.Disconnect the temperature probe from the top of the tank by pulling the probe from the grommet in the top of the tank lid.

8.Disconnect the pink wire from the level probe.

9.Disconnect the green wire from the top of the tank.

10.Disconnect the limit thermostat from the side of the tank.

11.Disconnect the two white wires from the tank warmer blanket.

12.Disconnect the black wire and red wire from the tank heater terminals.

13.Remove the four #8-32 nuts securing the tank to the mounting brackets and remove the tank as- sembly.

14.Remove the eight #8-32 nuts securing the tank lid to the tank.

15.Remove the two hex nuts securing the tank heater to the bottom of the tank. Remove tank heater with gaskets and discard.

16.Install new tank heater with gaskets to the bottom of the tank and secure with two hex nuts.

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Contents CEZ Cdbc Twin Contents IntroductionUser Notices Electrical Requirements Plumbing RequirementsElectrical Hook-Up Additional Warmer Switches ON/OFF SwitchBrew Switch Ready IndicatorCleaning Initial SET-UPCoffee Brewing CEZ Adjustments & Optional Settings Displaying Brew Temperature Cdbc Adjustments & Optional SettingsSetting Brew Temperature Setting Brew LockoutAdjusting Brew Volumes Pulse Brew Setup Procedure Cdbc Twin & Cdbcf Twin Troubleshooting Before troubleshooting this brewer, check for the followingProbable Cause TroubleshootingRefill Circuit Problem RemedyProblem Probable Cause Remedy Heating Circuit Problem Probable Cause Remedy Ings are taken 4b. Temperature Probe CEZ Remove the probe from3 of the J5 connector. At Control boardSet the temperature to 200F 4 of the J3 connector. At2b. Temperature Probe CEZ Remove the probe from Bilize. If temperature in tank isBrewing Circuit Problem Brew cycle will not startTroubleshooting Brewing Circuit Probable Cause Remedy Switch Move the two wires. Check forSupply and check wiring Holes are clear and unobDiagnostics Cause Things to CheckService Component AccessContents Service PC Control Board Model Cdbc Disconnect the 11-pin connector from the control panelService PC Control Board Model CEZ Control Boards CEZService Switch Panel Model Cdbc Switch Panels CdbcService ON/OFF Switches Model CEZ Service Brew Switch Start Model CEZ Bottom switch terminalMinals when the switch is released Service Dispense ValveLimit Thermostat Limit ThermostatsTank Heaters Tank HeaterService Tank Heaters Tank Heater WiringRefill Valve Check for continuity across the refill valve coil terminalsWarmer Elements Warmer ElementsSchematic Wiring Diagram CEZ Twin 0/6 Left Schematic Diagramwiring Twincdbc Schematic Wiring Diagram Cdbc Twin 2/2 Right
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TWIN specifications

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