Bunn H5M User Guide
10
SERVICE (cont.)
Limit Thermostat
Location:
The limit thermostat is located on the tank lid.
To test the limit thermostat, access will also be needed
to the terminal block located at the rear of the dis-
penser.
5. Check for continuity across the terminals of the
limit thermostat.
If continuity is not present as described, the circuit is
broken. Press the reset button of the limit thermostat
and recheck for continuity.
If continuity is not present as described, replace the
limit thermostat.
Removal and Replacement:
1. Remove both wires from the limit thermostat ter-
minals.
2. Remove the two #10-32 nuts attaching the limit
thermostat to the top of the tank.
3. Install the new limit thermostat and secure into
place with two #10-32 nuts.
4. Refer to FIG. 2 when reconnecting the wires.
Test Procedure:
1. Disconnect the dispenser from the power source.
2. Remove the blue/black wire at the limit thermostat
coming from the control thermostat.
3. Check the voltage across the blue/black wire and
the black wire at the tank heater with a voltmeter.
Connect the dispenser to the power source. The
indication must be:
a.) 100 to 120 volts ac for 100 to 120 volt mod-
els,
b.) 200 to 240 volts ac for 200 to 240 volt mod-
els,
c.) 230 volts ac for 230 volt models.
4. Disconnect the dispenser from the power source.
If voltage was present as described, reconnect the blue/
black wire and proceed to #5.
If voltage was not present as described, refer to the
Wiring Diagrams and check the dispenser wiring har-
ness.
FIG. 1 LIMIT THERMOSTAT
FIG. 2 LIMIT THERMOSTAT WIRING
BLK to Control Thermostat
BLK to Tank Heater
or
Contactor
P1793
P1776
Reset
10267 071900