Bunn RL00006929 User Manual

Page 14

FIG. 2 CONTROL THERMOSTAT

FIG. 3 THERMOSTAT WIRING

Location:

 

The control thermostat is located under the top 

cover or top warmer housing, FIG. 2.

 

To test the control thermostat, access will also 

be needed to the tank heater located in the bottom of 

the tank assembly.

Test Procedure:

1.  Disconnect the brewer from the power source.

2.  Check the voltage across the blue wire on the 

control thermostat and the white or red wire on 

the tank heater with a voltmeter.  Connect the 

brewer to the power source.  The indication must 

be:

 

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

 

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

240 volt models and three wire 120/240 volt 

models.

 

c) 100 volts ac for two wire 100 volt models.

3.  Disconnect the brewer from the power source.

If voltage is present as described, proceed to #4.

If voltage is not present as described, refer to the Wir-

ing Diagrams and check the brewer wiring harness.

4.  Check the voltage across the black wire terminal 

of the control thermostat and the white or red 

wire on the tank heater with a voltmeter when 

the control thermostat is turned “ON” (fully 

clockwise).  Connect the brewer to the power 

source.  The indication must be as described in 

step 2.  Voltage must not be indicated across 

these terminals when the thermostat is turned 

“OFF” (fully counterclockwise).

5.  Disconnect the brewer from the power source.

If voltage is present as described, the control thermo-

stat is operating properly.

If voltage is not present as described, replace the 

control thermostat.

Removal and Replacement:

1.  Remove the top cover or top warmer housing 

from the brewer to gain access.

2.  Remove both wires from the control thermostat 

terminals.

3.  Remove the thermostat bulb by firmly pulling-

up on the capillary tube at the tank lid.  This will 

disengage the grommet from the tank lid.

4.  Remove the two #8-32 screws holding the control 

thermostat to the bracket.

5.  Fasten the new control thermostat to the compo-

nent bracket.

NOTE - Make sure that the capillary tube is away from 

any electrical termination and is not kinked.

6.  Slide the grommet to the red mark on the capillary 

tube.

7.  Insert the 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.

8.  Carefully bend the capillary tube so that the tube 

and bulb inside the tank are in a vertical posi-

tion.

9.  Refer to FIG. 3 when reconnecting the wires.

10.  Readjust the control thermostat dial as re-

quired.

P1478

P1098

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