Bunn FMD DBC-3 Operating & Service Manual page 25

SERVICE (cont.)
CONTROL THERMOSTAT (cont.)
Electronic Thermostat (Optional)
1. Disconnect the dispenser from the power source.
2. Disconnect the black wire of the control thermo-
stat from the black wire from the limit thermostat.
3. Remove temperature probe from the tank.
4. With a voltmeter check the voltage across the
black wire from the control thermostat and the
white wire on the tank heater with the tank heater
switch in "ON" (lower) position. Connect the dis-
penser to the power source. The indication must
be 120 volts ac for two wire 120 volt models.
If voltage is present as described the control thermo-
stat is operating properly. Reinstall temperature probe
into the tank.
If voltage is not present as described, replace the
control thermostat.
Removal and Replacement.
1. Disconnect the wires from the thermostat.
2. Remove the thermostat capillary bulb/tempera-
ture probe by firmly pulling-up on the capillary/
probe grommet at the tank lid.
BLK from Main
Wiring Harness
MECHANICAL THERMOSTAT
Additional connections
with Hot Water
valve
BLK from Main
(BLU/BLK from Main
Wiring Harness Wiring Harness)
(BLU/BLK from Main
Wiring Harness)
FIG.12 THERMOSTAT TERMINALS
3. Loosen the two #8-32 screws securing the ther-
mostat bracket to the upper left rear of the dis-
penser housing.
4. Remove thermostat bracket and thermostat as an
assembly.
5. Install the new thermostat and bracket inside the
dispenser housing on the upper left rear side and
tighten the two #8-32 screws.
6A. (Mechanical thermostat only) Slide the grommet
to the line 4.5" above the bulb on the new capillary
tube.
6B. (Electronic thermostat only) Slide the grommet to
the bottom of the grounding clip on the wired end
of the probe.
7. Insert the capillary bulb/temperature probe through
the hole in the tank lid and press the grommet
firmly and evenly so that the groove in the grom-
met fits into the tank lid.
8. Carefully bend the capillary tube so that the tube
and bulb inside the tank are in the vertical position
and away from any electrical connections (me-
chanical thermostat only).
9. Refer to Fig. 12 and reconnect the wires.
NOTE - The capillary tube must be clear of any electri-
cal termination and not kinked.
BLK to Main
Wiring Harness
ELECTRONIC THERMOSTAT
25
TAN to WHI/BRN
in Main Wiring Harness
BLK to Main
Wiring Harness
WHI to Main
Wiring Harness
P1448
29215 052104