Bunn TB3Q-LP - Manual (Page 10)

Page 10
SERVICE
This section provides procedures for testing and
replacing various major components used in this
brewer should service become necessary. Refer to
Troubleshooting for assistance in determining the
cause of any problem.
WARNING - Inspection, testing, and repair of electri-
cal equipment should be performed only by qualified
service personnel. The brewer should be unplugged
when servicing, except when electrical tests are re-
quired and the test procedure specifically states to
plug-in the brewer.
COMPONENT ACCESS
WARNING - Disconnect the brewer from the power
source before the removal of any panel or the replace-
ment of any component.
All components are accessible by the removal of
the top cover, front inspection panel, and rear panel.
CONTROL THERMOSTAT
FIG. 10-1 COMPONENT ACCESS
FIG. 10-2 CONTROL THERMOSTAT
Location:
The control thermostat is located in the hood.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Locate the blue wire on the control thermostat.
3. Check the voltage across the blue/black wire on
the control thermostat and the white wire on the
tank heater on 120V models or red wire on the
tank heater on two wire 200V or 230V models
with a voltmeter. Connect the brewer to the power
source. The indication must be:
a) 120 volts ac for two wire 120 volt models.
b) 200 to 230 volts ac for two wire 200 or 230
volt models.
4. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #5.
If voltage is not present as described, refer to the wiring
diagrams and check the brewer wiring harness.
5. Locate the black wire on the control thermostat.
6. Gently remove the capillary bulb and grommet
from the tank.
7. Check the voltage across the black wire of the
control thermostat and the white wire on the tank
heater on 120V models or red wire on the tank
heater on two wire 200V or 230V models with a
voltmeter when the control thermostat is turned
fully clockwise. Connect the brewer to the power
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