Control Thermostat - Bunn VP17 Operating & Service Manual

SERVICE (cont.)
CONTROL THERMOSTAT (cont.)
Test Procedures:
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 wire on the
tank heater with a voltmeter. Connect the
brewer to the power source. The indication
must be 120 volts ac.
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 wire on the control thermostat.
6. Gently remove the capillary bulb and grommet
from the tank.
7. Check the voltage across the black wire of the
control thermostat and the white wire on the
tank heater with a voltmeter when the con-
trol thermostat is turned "ON" (Fully clock-
wise). Connect the brewer to the power
source. The indication must ber 120 volts
ac.
8. Disconnect the brewer from the power
source.
If voltage is present as described, reinstall the capillary
tube into the tank to the line 4.5" 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 control thermostat leads.
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. Remove the one #8-32 screw securing the
control thermostat to the component bracket
in the trunk.
4. Slide the grommet to the line 4.5" 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 grom-
met fits into the tank lid.
6. Carefully bend the capillary tube so that the tube
and bulb inside the tank are in the vertical posi-
tion.
NOTE - The capillary tube must be clear of any electri-
cal termination and not kinked.
7. Using one #8-32 screw secure the control ther-
mostat to the component bracket inside the trunk.
8. Refer to the illustration below when reconnecting
the wires.
9. Adjust the control thermostat as required.
Page 9
BLU to BLU Lead from BLU to BLU Lead from
Limit Thermostat Limit Thermostat
BLK to BLK Lead fromTank Heater BLK to BLK Lead fromTank Heater
P1162