Bunn C Manual De Usuario
Page 22
SERVICE (cont.)
TANK HEATER SWITCH
Location:
The tank heater switch is located on the rear
of the brewer on the upper left side of the trunk.
Test Procedure:
1.
1.
Disconnect the brewer from the power source.
2.
Disconnect the black wire from the limit thermo-
stat.
stat.
3.
With the tank heater switch in the "ON" position
check the voltage between the black wire re-
moved from the limit thermostat and the white
wire or red wire on the tank heater with a voltme-
ter. Connect the brewer to the power source. The
indication must be:
a) 120V volts ac on two wire 120 volt models.
b) 240 volts ac on three wire 120/240 volt mod-
els.
c) 200 to 230 volts ac on 200 volt or 230 volt
models.
check the voltage between the black wire re-
moved from the limit thermostat and the white
wire or red wire on the tank heater with a voltme-
ter. Connect the brewer to the power source. The
indication must be:
a) 120V volts ac on two wire 120 volt models.
b) 240 volts ac on three wire 120/240 volt mod-
els.
c) 200 to 230 volts ac on 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 har-
ness.
If voltage is not present as described, refer to the
Wiring Diagrams and check the brewer wiring har-
ness.
5.
Check for continuity between the black wire re-
moved from the limit thermostat and the black
insert on the terminal block. with the tank heater
switch in the "ON" upper position. Continuity
should not be present in the "OFF" lower position.
moved from the limit thermostat and the black
insert on the terminal block. with the tank heater
switch in the "ON" upper position. Continuity
should not be present in the "OFF" lower position.
If continuity is present as described, the tank heater
switch is operating properly.
If continuity is not present as described, replace the
tank heater switch.
switch is operating properly.
If continuity is not present as described, replace the
tank heater switch.
Removal and Replacement:
1.
1.
Shut-off and disconnect the incoming water sup-
ply to the brewer.
ply to the brewer.
2.
On automatic brewers gently remove the fill tube
from back of fill basin.
from back of fill basin.
3.
Remove the tank inlet fitting securing fill basin
the tank lid. Remove fill basin and gasket. Set all
three parts aside for reassembly.
the tank lid. Remove fill basin and gasket. Set all
three parts aside for reassembly.
4.
On brewers with faucets, disconnect the water
supply to coil assembly and remove the tube
from the tank to the faucet.
supply to coil assembly and remove the tube
from the tank to the faucet.
5.
Remove sprayhead and hex nut securing
sprayhead tube to the hood. Set aside for reas-
sembly.
sprayhead tube to the hood. Set aside for reas-
sembly.
6.
Disconnect the wires on the limit thermostat and
the tank heater and the control thermostat (early
models).
the tank heater and the control thermostat (early
models).
7.
Gently pull the thermostat sensor and grommet
from the tank lid.
from the tank lid.
8.
Insert a tube to the bottom of the tank and syphon
ALL of the water out. (BUNN-O-MATIC has
#12440 syphon assembly available for this pur-
pose.
ALL of the water out. (BUNN-O-MATIC has
#12440 syphon assembly available for this pur-
pose.
9.
Gently reinstall the thermostat sensor and grom-
met in the tank lid.
met in the tank lid.
10. Remove the two #8-32 screws securing the tank
assembly to the hood.
11. Lift tank and components out as an assembly and
set aside for reassembly.
12. Disconnect the two black wires from the tank
heater switch.
13. Remove the plastic facenut, hex facenut and the
switch indicator/guard bracket that secures tank
heater switch to the rear of the brewer. Remove
switch and discard.
heater switch to the rear of the brewer. Remove
switch and discard.
14. Insert new tank heater switch through the hole in
the upper left rear of the trunk and secure with