Bunn ITB Technical Training Manual page 24

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Additional Resource

Continuity Check the Following Components

• Limit Thermostat

• Switch Membrane

Voltage Check the Following Components

• Dual Inlet Valve 120VAC

• Tank Heater 120VAC

• Stepdown Transformer 120VAC/12VAC

• Brew Valve 155VDC-non activated, 1.0VDC Activated

• Thermistor Voltage Range 1.0 – 5.0VDC Dependent Upon Temp/Resistance

Resistance Check the Following Components

• Tank Heater 8.6 Ohms and Infinite to Ground/Chasis

• Thermistor- 32º F. at 32651 Ohms, 70º F. at 11864 Ohms and 205º F. at 761 Ohms

• Dual Valve/Coils 1130 Ohms

Transformer supplies the low 12VAC to power the main control board

Primary Side: Black and White (wires)120VAC

Secondary Side: Yellow (wires) 12VAC

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