Bunn VP17 Operating & Service Manual page 13

SERVICE (cont.)
TANK HEATER (Cont.)
WHI to WHI Lead on
Power Cord
TANK HEATER SWITCH
Location:
On VP17 the tank heater switch is
located on the rear of the brewer on the upper
left side of the trunk.
Test Procedure:
1. Disconnect the brewer from the power source.
2. Disconnect the black wire from the limit
thermostat.
3. With the tank heater switch in the "ON"
position check the voltage between the
black wire removed from the limit thermo-
stat and the white wire wire on the tank
heater with a voltmeter. Connect the brewer
BLK to Control Thermostat
P1163
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Page 13
to the power source. The indication must be
120V volts ac.
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.
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.
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.
Removal and Replacement:
1. Remove the tank inlet fitting securing fill basin
the tank lid. Remove fill basin and gasket. Set all
three parts aside for reassembly.
2. Remove sprayhead and hex nut securing
sprayhead tube to the hood. Set aside for reas-
sembly.
3. Disconnect the wires on the limit thermostat and
the tank heater.
4. Gently pull the thermostat sensor and grommet
from the tank lid.
5. 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.
6. Gently reinstall the thermostat sensor and grom-
met in the tank lid.
7. Remove the two #8-32 screws securing the
tank assembly to the hood.
8. Lift tank and components out as an assembly and
set aside for reassembly.
9. Disconnect the two black wires from the
tank heater switch.
10. 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.