Control Thermostat - Bunn HC-2 Operating & Service Manual

SERVICE (cont.)

CONTROL THERMOSTAT

MECHANICAL
ELECTRONIC (OPTIONAL)
FIG. 6 CONTROL THERMOSTAT
Location
Mechanical Thermostat
The mechanical thermostat is located on the
upper right side of the rear panel inside the dispenser.
Electronic Thermostat (Optional)
The electronic thermostat is located on the
right front side of the base just behind the front panel.
Test Procedure
Mechanical Thermostat
1. Disconnect the dispenser from the power source.
2. Disconnect the black wire of the control thermo-
stat from the black lead from the limit thermo-
stat.
3. Remove bulb from the tank.
4. Check the voltage across black wire on the con-
trol thermostat and the white pole on the termi-
nal block with the tank heater switch in the "ON"
lower position with a voltmeter. Connect the dis-
penser to the power source. The indication must
be:
a) 120 volts ac for two wire 120 volt models.
b) 120 volts ac for three wire 120/208 volt or
120/240 volt models.
c) 240 volts ac for two wire 240 volt models.
5. Disconnect the dispenser from the power source.
P1199.45
If voltage is present as described the control thermo-
stat is operating properly. Reinstall bulb into the tank.
If voltage is not present as described, replace the ther-
mostat.
Electronic Thermostat (Optional)
1. Disconnect the dispenser from the power source.
2. Disconnect the black wire of the control thermo-
stat from the black lead from the limit thermostat.
3. Remove temperature probe from the tank
4. Check the voltage across black wire on the control
thermostat and the white pole on the terminal
block with the tank heater switch in the "ON" lower
position with a voltmeter. Connect the dispenser
to the power source. The indication must be:
a) 120 volts ac for two wire 120 volt models.
b) 120 volts ac for three wire 120/208 volt or 120/
P1203.45 240 volt models.
c) 240 volts ac for two wire 240 volt models.
5. Disconnect the dispenser from the power source.
If voltage is present as described the control thermo-
stat is operating properly.Reinstall teperature probe
into the tank.
If voltage is not present as described, replace the ther-
mostat.
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