Bunn H5E H5X service manual SERVICE cont Electronic Controls cont

SERVICE (cont.)

Electronic Controls (cont.)

If the indicator was on or blinking, the temperature sen- sor is operating properly, proceed to #7.

If the indicator was off, check the sensor connection on the electronic control circuit board and/or replace the temperature sensor and the electronic control as- sembly.

NOTE - Each temperature sensor is calibrated to an electronic control assembly. Both components MUST be replaced as a set.

7.Check the voltage across the tank heater terminals with a voltmeter. Connect the dispenser to the power source. The indication must be:

a.) 100 to 120 volts ac for 100 to 120 volt models or

b.) 200 to 240 volts ac for 200 to 240 volt models while the red indicator on the circuit board is on or blinking.

8.Disconnect the dispenser from the power source.

If voltage was present as described, the temperature control of the system is operating properly.

If voltage was not present as described, contact Bunn- O-Matic to order an electronic control assembly, tem- perature sensor, and triac assembly for evaluation and proceed to #9.

9.Replace the electronic control assembly and tem- perature sensor.

NOTE - Each electronic control assembly is calibrated

to a temperature sensor. Both components MUST be replaced as a set.

10.Check the voltage across the tank heater terminals with a voltmeter. Connect the dispenser to the power source. The indication must be:

a.) 100 to 120 volts ac for 100 to 120 volt models or

b.) 200 to 240 volts ac for 200 to 240 volt models while the red indicator on the circuit board is on or blinking.

11.Disconnect the dispenser from the power source.

If voltage was present as described, return the new triac assembly to Bunn-O-Matic for credit. The tem- perature control of the system is operating properly.

If voltage was not present as described, reinstall your existing electronic control assembly and temperature sensor, and proceed to #12.

12.Replace the triac assembly.

13.Check the voltage across the tank heater terminals with a voltmeter. Connect the dispenser to the power source. The indication must be:

a.) 100 to 120 volts ac for 100 to 120 volt models or

b.) 200 to 240 volts ac for 200 to 240 volt models while the red indicator on the circuit board is on or blinking.

14.Disconnect the dispenser from the power source.

If voltage was present as described, the temperature control of the system is operating properly. Return the new electronic control assembly and temperature sen- sor to Bunn-O-Matic for credit.

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