Bunn FMD-1 FMD-2 service manual CONTROL BOARD - FMD-2 ONLY, SERVICE cont

SERVICE (cont.)

CONTROL THERMOSTAT - FMD-1 & FMD-2 (cont.)

a)120 volts ac for two wire 120 volt models.

b)208 volts ac for three wire 120/208 volt models.

c)240 volts ac for three wire 120/240 volt models.

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.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.

2.Loosen the two #6-32 screws securing the ther- mostat to the front tank mounting bracket.

3.Disconnect the wires from the thermostat.

4.Remove thermostat and remove the screws and spacers from the thermostat.

5.Discard thermostat.

6.Install two spacers and two #6-32 screws on the new thermostat.

7.Position the thermostat on the botttom side of the front tank mounting bracket and tighten the two #6-32 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. 11 and reconnect the wires.

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

BLK from Limit

Thermostat

BLK from Tank

Heater Switch

	P1668
FIG. 11 THERMOSTAT TERMINALS

CONTROL BOARD - FMD-2 ONLY

J1
J2
J4
J3
FIG. 12 CONTROL BOARD	P1666

Location:

The Control Board is located behind the lower front access cover mounted on the component bracket.

Test Procedure:

Liquid Level Control Circuitry:

1.Disconnect the dispenser from the power source.

2.Disconnect the six pin connector from J3 of the control board.

3.Check the voltage across pins 5 & 6 of the six pin connector on the wiring harness with a voltmeter. Connect the dispenser to the power source. The indication must be 24 volts ac.

4.Disconnect the dispenser from the power source.

If voltage is present as described, proceed to step 5. If voltage is not present as described, refer to the wiring diagram and check the dispenser wiring har- ness.

5.Reconnect the six pin connector of the wiring harness to J3 of the control board.

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