Bunn TU3Q-EZ - Manual (Page 16)

Page 16
SERVICE (cont.)
LIMIT THERMOSTAT
FIG. 4 LIMIT THERMOSTAT
P1798.40
Location:
The limit thermostat is located inside the hood on
the tank lid.
Test Procedure:
1. Disconnect the brewer from the power source and
remove the blue wire from the limit thermostat.
2. With a voltmeter, check the voltage across the blue
wire removed from the limit thermostat and the
white wire on the tank heater terminal. Connect
the brewer to the power source. The indication
must be 120 volts ac for two wire120 volt mod-
els.
3. Disconnect the brewer to from the power source.
If voltage is present as described, reconnect the blue
wire and proceed to #4.
If voltage is not present as described, refer to the
Wir-
ing Diagrams and check the wiring harness.
4. Remove the black wire from the limit thermostat.
5. With a voltmeter, check the voltage across the ex-
posed terminal of the limit thermostat and the
white wire on the tank heater terminal. Connect
the brewer to the power source. The indication
must be 120 volts ac for two wire 120 volt mod-
els.
6. Disconnect the brewer from the power source.
If voltage is present as described, reconnect the black
wire to the limit thermostat. The limit thermostat is
operating properly.
If voltage is not present as described, replace the limit
thermostat.
Removal and Replacement
1. Remove both wires from the limit thermostat ter-
minals.
2. Carefully slide the limit thermostat out from un-
der the retaining clip.
3. Carefully slide the new limit thermostat into the
retaining clip.
4. Refer to Fig. 5 when reconnecting the wires.
BLU to Control
Board N.O.
BLK to Tank Heater
FIG. 5 LIMIT THERMOSTAT TERMINALS
P1800
29460 061599