Bunn DV User Manual

Page 12

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 dispenser.

If voltage was present as described, reconnect the black
wire and proceed to #5.
If voltage was not present as described, refer to the Wir-
ing Diagrams and check the dispenser wiring harness.

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. 4 when reconnecting the wires.

Test Procedure:
1. Disconnect the dispenser from the power source.
2. There are two black wires on the limit thermostat

terminals. One comes from the terminal block. The
other goes directly to the tank heater terminal. Re-
move the black wire at the limit thermostat coming
from the terminal block.

3. Check the voltage across the black wire removed

from the limit thermostat and the white wire or red
wire of the terminal block 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 models
or

b.) 200 to 240 volts ac for 200 to 240 volt models

c.) 230 volts ac for 230 volt models.

4. Disconnect the dispenser from the power source.

FIG. 12a LIMIT THERMOSTAT

FIG. 12c LIMIT THERMOSTAT WIRING

BLK to Terminal Block

BLK to Tank Heater

P4093

P1776

Reset

P1993

FIG. 12b LIMIT THERMOSTAT

42311 071310

H 10

H 5