Bunn H5X - Manual (Page 11)

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
or
c.) 230 volts ac for 230 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-
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
or
c.) 230 volts ac for 230 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.
Temperature Control Flow Charts
Limit Thermostat OK
?
Red Light On
Constantly
?
Measure Voltage
At Tank Heater
No
No
Yes
Yes
Yes
No
No
H5X THERMOSTAT
PROBLEM: Water Not Hot Enough
Replace Limit Thermostat
Voltage Present
?
Voltage Present
?
Yes
Measure Voltage
At Tank Heater
Replace Tank Heater
Replace Control Assembly
Replace Triac
Reinstall Original
Control Assembly
Check For Split Tank Heater
Recheck Water Temperature
Replace Steam Sensor
Red Light On
Constantly
?
Replace Control Assembly
Yes
No
Recheck Water Temperature
Jumper JP1
In Boil Position
?
Yes
No
Reposition Jumper
Limit Thermostat OK
?
Red Light On
Constantly
?
Measure Voltage
At Tank Heater
No
No
Yes
Yes
Yes
No
No
H5E THERMOSTAT
PROBLEM: Water Not Hot Enough
Replace Limit Thermostat
Voltage Present
?
Voltage Present
?
Yes
Measure Voltage
At Tank Heater
Replace Tank Heater
Replace Control Assembly
Replace Triac
Reinstall Original
Control Assembly
Check For Split Tank Heater
Recheck Water Temperature
Turn Temperature
Adjustment Screw
Clockwise Contiuously
Red Light On
?
Replace Control Assembly
Yes
No
Adjust For Correct
Water Temperature
10420 091902