On/Off Switch - Bunn TU3 Operating & Service Manual

SERVICE (cont.)
ON/OFF SWITCH (SELECTOR SWITCH - OPTIONAL)
FIG. 16 ON/OFF SWITCH
Location:
The ON/OFF switch is located in the front of the
hood, above and to the left of the brew funnel.
Test Procedure:
Brewers W/Out Half Batch Option
1. Disconnect the brewer from the power source.
2. Remove the black and white/violet wires from the
switch terminals.
3. With a voltmeter, check the voltage across the
black wire removed from the ON/OFF switch and
the white wire remaining on the switch terminal.
4. Connect the brewer to the power source. The in-
dication must be 120 volts ac for two wire 120
volt models.
5. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #6.
If voltage is not present as described, refer to the Wir-
ing Diagrams and check the wiring harness.
6. Check for continuity across the center and end
If continuity is present as described, replace the wires,
the switch is operating properly.
If continuity is not present as described, replace the
switch.
Brewers W/Half Batch Option
BR EW
IC K
QU
1. Disconnect the brewer from the power source.
2. Remove the black wire from the top center switch
3. With a voltmeter, check the voltage across the
4. Connect the brewer to the power source. The in-
5. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #6.
If voltage is not present as described, refer to the Wir-
ing Diagrams and check the wiring harness.
P1187.40
6. Check for continuity across the center and left or
If continuity is present as described, replace the wires,
the switch is operating properly.
If continuity is not present as described, replace the
switch.
7. Disconnect the pink and gray wires from the left
8. Check for continuity across the left and center ter-
If continuity is present as described, replace the wires
the switch is operating properly.
If continuity is not present as described, replace the
switch.
Page 24
terminals of the top row when the switch is in the
"ON" position.
terminal.
black wire removed from the selector switch and
the white wire or red wire on the tank heater.
dication must be:
a) 120 volts ac for two wire 120 volt models.
a) 240 volts ac for two wire 240 volt models.
b) 100 volts ac for two wire 100 volt models.
right terminals of the top row when the switch is
in the "FULL" or "HALF" position.
and center terminals.
minals in rows two, three and four with the switch
in the half batch position.
10225 021599