Limit Thermostat - Bunn OT Operating & Service Manual

SERVICE (cont.)

Limit Thermostat

FIG. 19 LIMIT THERMOSTAT
Location:
The limit thermostat is located on the tank lid between
the tank heater terminals, FIG. 19.
Test Procedure:
1. Disconnect the brewer from the power source.
2. Check voltage across the black wire from the limit
thermostat and the white or red wire on the tank
heater terminal. Connect the brewer to the power
source. The indication must be:
a) 120 volts ac for two wire 120 volt models.
b) 200 or 240 volts ac for two wire 200 volt or
240 volt models and three wire 120/240 volt
models.
c) 100 volts ac for two wire 100 volt models.
3. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #4.
If voltage is not present as described, refer to the Wir-
ing Diagrams and check the brewer wiring harness.
4. Check for continuity across the limit thermostat
terminals.
If continuity is present as described, the limit thermo-
stat is operating properly.
If continuity is not present as described, replace the
limit thermostat.
Removal and Replacement:
1. Remove both wires from the limit thermostat
terminals.
2. Carefully slide the limit thermostat out from under
the retaining clip.
3. Carefully slide the new limit thermostat into the
retaining clip.
4. Refer to FIG. 20 when reconnecting the wires.
P1698
BLK to Terminal Block
FIG. 20 LIMIT THERMOSTAT WIRING
Page 21
Part II
BLU to BLU Lead from
Control Thermostat
P1984
32440 070700