Digital Timer (Late Models) - Bunn CWT Twin Operating & Service Manual

SERVICE (cont.)
DIGITAL BREW TIMER (Late Models)
FIG. 21 DIGITAL BREW TIMER
Location:
The timers are located inside the front of the trunk
on the upper right side of the component brackets.
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
remove the front access panel.
2. Remove the one #8-32 screw securing circuit
board to the mounting bracket.
3. Remove circuit board and spacers (as required).
4. With a voltmeter, check the voltage across terminals
TL1 and TL2 when the "ON/OFF" switch is in the
"ON" position. Connect the brewer to the power
source. The indication must be:
a) 120 volts ac for three wire 120/240 volt mod-
els.
b) 200 volts ac for two wire 200 volt models.
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for three wire three phase 230 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 harness.
6. With a voltmeter, check the voltage across terminals
TL1 and TL4 when the "ON/OFF" switch is in the
"ON" 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.
7. With a voltmeter, check the voltage across ter-
minals TL1 and TL4 when the "ON/OFF" switch
is in the "ON" position. Connect the brewer to the
power source and press the "START" switch. The
indication must be as follows:
a) 120 volts ac for three wire 120/240 volt mod-
els.
b) 200 volts ac for two wire 200 volt models.
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for three wire three phase 230 volt
P2197
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.
Removal and Replacement:
1. Remove the one #8-32 screw 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
prior to installation to the component mounting
bracket. Refer to Fig. 22 when reconnecting the
wires.
5. Install new circuit board with spacers (as required)
to the component mounting bracket. The tapered
spacer should locate over the pin.
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 fi lled, and a funnel and server are in
place.
NOTE: All volume settings must be done with the
sprayhead installed.
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