Manuals / Bunn / Kitchen Appliance / Coffeemaker

Bunn ITB/ITCB Tank Heaters, 1 ICB TWIN TANK HEATERS Location, 2 DV TANK HEATERS, Test Procedures

Models: ITB/ITCB ICB/TWIN

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TANK HEATERS

TANK HEATERS

	2268W	1425W
	Large
		Small
	Dia.
		Dia.

FIG. 17-1 ICB TWIN TANK HEATERS

Location:

The tank heaters are located inside the tank and secured to the tank bottom.

Test Procedures:

1.With a voltmeter, check voltage across the white wire (120V Models) or red wire (120/208-240V Models) from the terminal block and black wire from the control board. Connect brewer to the power source. The indication must be 120 volts ac for two wire 120 volt models or 208-240 volts ac for three wire 120/208-240 volt models (during a heating cycle).

2.Disconnect the brewer from the power source.

If voltage is present as described, proceed to #3.

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

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

4.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.

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

FIG. 17-2 DV TANK HEATERS

HEATER	RESISTANCE
1425W-120V	9.5-11.0
3500W-240V	15.1-17.6
1680W-120V	7.9-9.2
1800W-120V	7.4-8.7
2268W-120V	5.9-6.9
3000W-208V	12.9-15.1
3000W-240V	17.9-20.7
3500W-200V	10.5-12.2

TERMINAL TO SHEATH - INFINITE (OPEN)

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

Removal and Replacement:

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

2.Drain water from the tank.

3.Disconnect all the hoses from the tank.

4.Remove the temperature probe from the grommet in the tank lid.

5.Remove the level probe from it's grommet.

6.Disconnect the green wire from the tank lid.

7.Disconnect the wires from tank heater terminals.

8.Remove the nuts securing the tank lid to the tank.

9.Remove the hex nuts securing the tank heater to the bottom of the tank. Remove tank heater(s) with gaskets and discard.

10.Install new tank heater(s) with gaskets to the bot- tom of the tank and secure with two hex nuts.

11.Install tank lid and secure with nuts.

12.Reconnect the wires to tank heater terminals.

17	42461 0911809

Image 17

Bunn ITB/ITCB Tank Heaters, 1 ICB TWIN TANK HEATERS Location, 2 DV TANK HEATERS, Test Procedures, Removal and Replacement

Contents

ITB/ITCB ICB/TWIN SERVICE & REPAIR MANUALInfusion Series BUNN-O-MATIC CORPORATIONBUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY INTRODUCTION CONTENTSExercise extreme caution when servicing electrical equipment TROUBLESHOOTINGFollow recommended service procedures Replace all protective shields or safety noticesPROBABLE CAUSE TROUBLESHOOTING cont REFILL CIRCUIT PROBLEMREMEDY Remove Level Probe and checkPROBLEM TROUBLESHOOTING cont HEATING CIRCUITLime build up on temperature Inspect probe and tank assemblyPROBLEM TROUBLESHOOTING cont BREWING CIRCUITdisable the brew lockout feature NOTE Volume adjustments must beBREWING CIRCUIT cont TROUBLESHOOTING contPROBLEM PROBABLE CAUSEMESSAGE DIAGNOSTICSPROBABLE CAUSE REMEDYFIG. 10-1 ICB COMPONENT ACCESS COMPONENT ACCESSFIG. 10-2 ITB/ITCB COMPONENT ACCESS FIG. 10-3 ICB TWIN COMPONENT ACCESSCheck for Power to board Test ProceduresRemoval and Replacement Faceplate Removal and ReplacementFIG. 12-1 MEMBRANE SWITCH Location MEMBRANE SWITCHFIG. 12-2 MEMBRANE SWITCH CONTINUITY Test ProceduresFIG. 13-1 EARLY BREW VALVE Location BREW VALVE EARLY MODELS AND BYPASS VALVE ON ALL ICBsIf no sound is heard as described, proceed to #4 FIG. 13-2 EXPLODED VIEWFIG. 14-2 LATE MODEL BREW VALVE BREW VALVE LATE MODELS FIG. 14-1 LATE MODEL BREW VALVE LocationTest Procedures Removal and ReplacementREFILL VALVES FIG. 15-1 REFILL VALVES Location DisassemblyIf voltage is present, proceed to # If the sound is not heard as described, pro- ceed to #EARLY ICB REFILL VALVESEARLY ITCB CURRENT ICB & & ITBFIG. 17-1 ICB TWIN TANK HEATERS Location TANK HEATERSFIG. 17-2 DV TANK HEATERS Test ProceduresFIG. 18-1 LIMIT THERMOSTAT LIMIT THERMOSTATLocation The limit thermostat is located on the tank lid on theFIG. 19-2 TEMPERATURE PROBE FIG. 19-3 TESTING TEMPERATURE PROBE TEMPERATURE PROBE FIG. 19-1 TEMPERATURE PROBE LocationRemoval and Replacement CONTINUED Test ProceduresCalibration TEMPERATURE PROBE Removal and ReplacementFIG. 20-1 CALIBRATE TEMP PROBE FIG. 20-2 CALIBRATIONTest Procedure VOLTAGE SELECTOR SWITCH FIG. 21-1 VOLTAGE SELECTOR SWITCH LocationFIG. 21-2 VOLTAGE SELECTOR SWITCH TERMINALS Removal and ReplacementFIG. 22-2 ROCKER SWITCH POWER SWITCH FIG. 22-1 POWER SWITCH ICB SHOWN LocationTest Procedure Removal and Replacement200V AC 2 WIRE SCHEMATIC WIRING DIAGRAM iTCBA, iTCBB230V AC 2 WIRE SINGLE PHASEITCB-DV & ITCB-C-DV SCHEMATIC WIRING DIAGRAM120V AC 2 WIRE 120/208V AC 3 WIRESCHEMATIC WIRING DIAGRAM WITH FACTORY SWEETENER120V AC 2 WIRE 120/208V AC 3 WIRE 120/240V AC 3 WIRE SINGLE PHASE ITCB-DV & ITCB-C-DV120V AC 2 WIRE 120/208V AC 3 WIRE 120/240V AC 3 WIRE SINGLE PHASE SCHEMATIC WIRING DIAGRAM ICB-DV3 WIRE + GND SCHEMATIC WIRING DIAGRAM ICB TWINSINGLE PHASE 120/208 OR 120/240200V AC 2 WIRE 230V AC 2 WIRE SINGLE PHASE SCHEMATIC WIRING DIAGRAM iCBA, iCBB230 VOLTS AC SCHEMATIC WIRING DIAGRAM ICB TWIN 230V Chassis Ground TERM2 WIRE + GND SINGLE PHASE SINGLE & DUAL DILUTION MODELS AND MODELS w/OPTIONAL SWEETENER SCHEMATIC WIRING DIAGRAM ITB120V AC 2 WIRE + GROUND SINGLE PHASE