Bunn C Manuales De Servicio
Page 15
SERVICE (cont.)
CONTROL THERMOSTAT
MODEL CWT
MODEL SINGLE CW
Location:
The control thermostat is located inside the trunk
on the left side of the component bracket.
Test Procedures:
1.
1.
Disconnect the brewer from the power source.
2.
Locate the blue wire on the control thermostat.
3.
Check the voltage across the blue wire on the
control thermostat and the white insert on two
pole 120 volt terminal block or three pole 120/
240 volt terminal blocks and the red insert on two
wire 200 volt or 240 volt terminal block with a
voltmeter. Connect the brewer to the power
source. The indication must be:
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models.
b) 200 to 230 volts ac for two wire 200 volt or 230
volt models.
control thermostat and the white insert on two
pole 120 volt terminal block or three pole 120/
240 volt terminal blocks and the red insert on two
wire 200 volt or 240 volt terminal block with a
voltmeter. Connect the brewer to the power
source. The indication must be:
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models.
b) 200 to 230 volts ac for two wire 200 volt 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.
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 insert on the
two pole 120 volt or three pole 120/240 volt
terminal block and the red insert on the two pole
200 volt or 230 volt terminal block with a voltme-
ter when the control thermostat is turned fully
clockwise. Connect the brewer to the power
source. The indication must be:
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models.
b) 200 to 230 volts ac for two wire 200 volt or 230
volt models.
control thermostat and the white insert on the
two pole 120 volt or three pole 120/240 volt
terminal block and the red insert on the two pole
200 volt or 230 volt terminal block with a voltme-
ter when the control thermostat is turned fully
clockwise. Connect the brewer to the power
source. The indication must be:
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models.
b) 200 to 230 volts ac for two wire 200 volt or 230
volt models.
8.
Disconnect the brewer from the power source.
If voltage is present as described, reinstall the capillary
tube into the tank to the line 4.5" (6.0" for Single CW
models) above the bulb, the control thermostat is
operating properly.
If voltage is not present as described, replace the
thermostat.
tube into the tank to the line 4.5" (6.0" for Single CW
models) above the bulb, the control thermostat is
operating properly.
If voltage is not present as described, replace the
thermostat.
Removal and Replacement:
1.
1.
Remove wires from control thermostat leads.
2.
Remove the thermostat capillary bulb by firmly
pulling-up on the capillary at the tank lid. This will
disengage the grommet from the tank lid.
pulling-up on the capillary at the tank lid. This will
disengage the grommet from the tank lid.
3.
Remove the one #8-32 screw securing the con-
trol thermostat to the component bracket in the
trunk.
trol thermostat to the component bracket in the
trunk.
MODEL C
P1153
10841 071000