Bunn H5E H5X Operating & Service Manual page 11

SERVICE (cont.)
Electronic Controls (cont.)
Liquid Level Control Test Procedure
1. Disconnect the dispenser from the power source.
2. Check the voltage across terminals 3 & 4 of the
electronic control assembly with a voltmeter. Con-
nect the dispenser to the power source. The indi-
cation 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.
3. Disconnect the dispenser from the power source.
If voltage was present as described, proceed to #4.
If voltage was not present as described, refer to
the Wiring Diagrams and check the dispenser wir-
ing harness.
4. Remove the pink wire from terminal 5 of the elec-
Temperature Control Flow Charts
H5X THERMOSTAT
PROBLEM: Water Not Hot Enough
Jumper JP1
No
In Boil Position Reposition Jumper
?
Yes
No
Red Light On
Replace Steam Sensor
Constantly
?
Yes
Measure Voltage
At Tank Heater
Voltage Present Yes
Replace Tank Heater
?
No
No
Replace Limit Thermostat
Limit Thermostat OK
?
Yes
Replace Control Assembly
Measure Voltage
At Tank Heater
Replace Triac
No
Voltage Present
Check For Split Tank Heater
?
Reinstall Original
Control Assembly
Yes
Recheck Water Temperature
Yes
Red Light On
Constantly
?
Recheck Water Temperature
No
Replace Control Assembly
tronic control assembly.
5. Check the voltage across terminals 1 & 4 of the
electronic control assembly with a voltmeter. Con-
nect the dispenser to the power source. The indi-
cation must be:
a.) 100 to 120 volts ac for 100 to 120 voltmodels
or
b.) 200 to 240 volts ac for 200 to 240 volt models
after a delay of approximately 5 seconds.
6. Disconnect the dispenser from the power source.
If voltage was present as described, the liquid level
control of the system is operating properly, proceed to
#7.
If voltage was not present as described, replace the
electronic control assembly and the temperature sen-
sor in the tank lid.
NOTE - Each electronic control assembly is calibrated
to a temperature sensor. Both components MUST be
replaced as a set.
H5E THERMOSTAT
PROBLEM: Water Not Hot Enough
No
Red Light On
Constantly
?
Yes
Measure Voltage
At Tank Heater
Yes
Voltage Present
?
No
No
Replace Limit Thermostat
Limit Thermostat OK
?
Yes
Replace Control Assembly
Measure Voltage
At Tank Heater
No
Voltage Present
Check For Split Tank Heater
?
Yes
Recheck Water Temperature
11
Turn Temperature
Adjustment Screw
Clockwise Contiuously
Red Light On
?
Water Temperature
No
Replace Control Assembly
Replace Tank Heater
Replace Triac
Reinstall Original
Control Assembly
Yes
Adjust For Correct
10420 011599