Bunn Dual TF User Manual download pdf (Page 18)

Page 18

6. Gently remove the capillary bulb and grommet

from the tank.

7. Check the voltage across the black wires of the

control thermostat and the white insert on the

three pole 120/208V, 120/240V terminal blocks

and the red insert on two pole 200V, 240V terminal

blocks with a voltmeter when the control thermo-

stat is turned "ON" (fully clockwise). Connect the

brewer to the power source. The indication must

be:

a.) 120 volts ac for three wire 120/208 volt mod-

els and three wire 120/240 volt models.

b.) 200 to 240 volts ac for two wire 200 or 240 volt

models.

Voltage must not be indicated across these

terminals when the thermostat is turned "OFF"

(fully counterclockwise).

8. Disconnect the brewer from the power source.

If voltage is present as described, reinstall the capillary

tube into the tank to the line 7" above the bulb, the

control thermostat is operating properly.

If voltage is not present as described, replace the

thermostat.

Removal and Replacement:

1. Remove wires from the control thermostat.

2. Remove the thermostat capillary bulb by firmly

pulling-up on the capillary tube at the tank lid. This

will disengage the grommet from the tank lid.

3. Remove the #8-32 slotted head screw holding the

control thermostat to the component bracket.

4. Slide the grommet to the line 7" above the bulb on

the new capillary tube.

5. 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.

6. Carefully bend the capillary tube so that the tube

and bulb inside the tank are in the vertical position.

NOTE - The capillary tube must be clear of any electri-

cal termination and not kinked.

7. Using a #8-32 slotted head screw fasten the con-

trol thermostat to the component bracket.

8. Refer to the illustration below when reconnecting

the wires.

9. Adjust the control thermostat as required.

P974

Location:

The control thermostat is located inside the

lower left front of the brewer on the component

bracket.

1. Disconnect the brewer from the power source.

2. Locate the blue wire on the control thermostat.

3. Check the voltage across the blue wire on the

control thermostat and the white insert on three

pole 120/208V, 120/240V terminal block and the

red insert on two pole 200V, 240V terminal block

with a voltmeter. Connect the brewer to the power

source. The indication must be:

a.) 120 volts ac for three wire 120/208 volt mod-

els and three wire 120/240 volt models.

b.) 200 to 240 volts ac for two wire 200 or 240 volt

models.

4. Disconnect the brewer from the power source.

If voltage is present as described, proceed to #5.

If voltage is not present as described, refer to the

wiring diagrams and check the brewer wiring harness.

5. Locate the black wires from the control thermo-

stat.

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Bunn Dual TF User Manual Page 18

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