Bunn FMD-1 Service Manual

15

5. Disconnect the dispenser from the power source.

If voltage is present as described the control thermo-
stat is operating properly. Reinstall bulb into the tank.
If voltage is not present as described, replace the
thermostat.

Removal and Replacement.
1. Disconnect the wires from the thermostat.
2. Remove the thermostat capillary bulb by firmly

pulling-up on the capillary at the tank lid. This will
disengage the grommet from the tank lid.

3. Loosen  the  two #8-32 screw securing the thermo-

stat to the upper left rear side of the dispenser
housing.

4. Remove thermostat bracket and thermostat as an

assembly.

5

Remove the two #6-32 screws securing the ther-
mostat to the thermostat bracket and discard
thermostat.

6. install new thermostat on the thermostat bracket

using two #6-32 screws.

7. Install the thermostat and bracket inside the dis-

penser housing on the upper left rear side and
tighten the two #8-32 screws.

8. Slide the grommet to the line 4.5" above the bulb

on the new capillary tube.

9. Insert the capillary bulb through the hole in the

tank lid and press the grommet firmly and evenly
so that the groove in the grommet fits into the tank
lid.

10. 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.

11. Refer to Fig. 7 and reconnect the wires.

NOTE - The capillary tube must be clear of any electri-
cal termination and not kinked.

P1447

FIG. 5 BALLAST TERMINALS

FIG. 6 CONTROL THERMOSTAT

P1505

BLK to Main
Wiring Harness

BLK to BLU from
Door Interconnect
Harness

Location

The thermostat is located inside the dispenser

on the upper left rear side of the housing.

Test Procedure
1. Disconnect the dispenser from the power source.
2. Disconnect the black wire of the control thermo-

stat from the black lead from the limit thermostat.

3. Remove bulb from the tank.
4. Check the voltage across black wire on the control

thermostat and the white or red wire on the tan
heater with the tank heater switch in the “ON”
lower position with a voltmeter. Connect the dis-
penser to the power source. The indication must
be:
a) 120 volts ac for two wire 120 volt models.
b) 120 volts ac for three wire 120/208 volt or 120/
240 volt models.

FIG. 7 THERMOSTAT TERMINALS

P1448

BLK from Limit
Thermostat

Blk from Tank
Heater Switch

28364 041598