Bunn TWF Manual De Usuario
Page 18
Location:
The timer is located inside the hood on the left side.
Test Procedure.
NOTE: Do not remove or install wires while timer board
is installed. Pressure applied to one side may cause
damage to the board.
1. Disconnect the brewer from the power source and
NOTE: Do not remove or install wires while timer board
is installed. Pressure applied to one side may cause
damage to the board.
1. Disconnect the brewer from the power source and
remove the front access panel.
2. Remove the two #8-32 screws securing circuit
board to the mounting bracket.
3. Remove circuit board and spacers (as required).
4. With a voltmeter, check the voltage across termi-
4. With a voltmeter, check the voltage across termi-
nals TL1 and TL2 when the "TEA/OFF/COFFEE"
switch is in the "COFFEE" position. Connect the
brewer to the power source. The indication must
be 120 volts ac for two wire 120 volt models and
three wire 120/208 volt models.
switch is in the "COFFEE" position. Connect the
brewer to the power source. The indication must
be 120 volts ac for two wire 120 volt models and
three wire 120/208 volt models.
5. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #6.
If voltage is not present as described, refer to the
Wiring Diagrams and check the brewer wiring har-
ness.
If voltage is not present as described, refer to the
Wiring Diagrams and check the brewer wiring har-
ness.
6. With a voltmeter, check the voltage across termi-
nals TL1 and TL4 when the "TEA/OFF/COFFEE"
switch is in the "COFFEE" position. Connect the
brewer to the power source. The indication must
be 0 volts.
switch is in the "COFFEE" position. Connect the
brewer to the power source. The indication must
be 0 volts.
If voltage is as described, proceed to #7.
If voltage is not as described, disconnect the brewer
from the power source and replace the timer.
If voltage is not as described, disconnect the brewer
from the power source and replace the timer.
7. With a voltmeter, check the voltage across termi-
nals TL1 and TL4 when the "TEA/OFF/COFFEE"
switch is in the "COFFEE" position. Connect the
brewer to the power source and press the START
switch. The indication must be 120 volts ac for two
wire 120 volt models and three wire 120/208 volt
models.
switch is in the "COFFEE" position. Connect the
brewer to the power source and press the START
switch. The indication must be 120 volts ac for two
wire 120 volt models and three wire 120/208 volt
models.
If voltage is present as described, the brew timer is
operating properly. Reset the timer as required, to
obtain the desired brew volume.
If voltage is not present as described, disconnect the
brewer from the power source and replace the timer.
operating properly. Reset the timer as required, to
obtain the desired brew volume.
If voltage is not present as described, disconnect the
brewer from the power source and replace the timer.
Removal and Replacement:
1. Remove the two #8-32 screws securing circuit
1. Remove the two #8-32 screws securing circuit
board to the mounting bracket.
2. Remove circuit board and spacers (as required).
3. Remove all wires from the timer.
4. Attach all wires to the replacement timer board
3. Remove all wires from the timer.
4. Attach all wires to the replacement timer board
prior to installation to the component mounting
bracket. Refer to FIG. 9 when reconnecting the
wires.
bracket. Refer to FIG. 9 when reconnecting the
wires.
5. Install new circuit board with spacers (as re-
quired) to the component mounting bracket.
6. Adjust the timer as described below.
Timer Setting:
NOTE: Prior to setting or modifying volumes, check
that the brewer is connected to water supply, the tank
is properly filled, and a funnel and server are in place.
NOTE: All volume settings must be done with the
sprayhead installed.
NOTE: Prior to setting or modifying volumes, check
that the brewer is connected to water supply, the tank
is properly filled, and a funnel and server are in place.
NOTE: All volume settings must be done with the
sprayhead installed.
SERVICE (cont.)
DIGITAL BREW TIMER (HOT COFFEE -Late Models)
FIG. 8 DIGITAL BREW TIMER
P2198.50
10510 071000