Bunn U3 U3A Coffeemaker User Manual


 
Page 32
SERVICE (cont.)
TIMER (Early Models)(cont.)
5. With a voltmeter, check the voltage across the
sockets P1 and P2 (blue and white wires) of the
female connector on the main harness when the
"ON/OFF" switch is in the "ON" (upper) position and
the start switch pressed. Connect the brewer to the
power source. The indication must be:
a) 120 volts ac for three wire 120/208 volt, 120/
240 volt, 380 volt models and 208 or 240 volt ac
for four wire 440 volt models.
b) 208 volts ac for two and three wire 208 volt
models.
c) 240 volts ac for two and three wire 240 volt
models.
d) 230 volts ac for two wire 230 volt CE models.
6. Disconnect the brewer from the power source.
7. Reconnect the three pin connector from the main
wiring harness to the connector on the timer.
If voltage is present as described, proceed to #8.
If voltage is not present as described, refer to the
Wiring Diagrams
and check the brewer wiring har-
ness.
8. Disconnect the black and white wires to the pump.
9. With a voltmeter, check the voltage across the
black and white wires when the "ON/OFF" switch is
in the "ON" (upper) position and the start switch
pressed to the start position and released. Connect
the brewer to the power source. The indication
must be:
a) 120 volts ac for three wire 120/208 volt, 120/
240 volt, 380 volt and 208 or 240 volt ac for four
wire 440 volt models.
b) 208 volts ac for two and three wire 208 volt
models.
c) 240 volts ac for two and three wire 240 volt
models.
d) 230 volts ac for two wire 230 volt CE models.
If voltage is present as described, the brew timer is
operating properly. Reset the timer dial as required, to
obtain the desired brew volume.
If voltage is not present as described, replace the
timer.
Removal and Replacement:
1. Separate all connectors between the brewer wir-
ing harness and the timer.
2. Disconnect the timer leads from the pump leads.
3. Remove the two #8-32 screws securing the brew
timer to the component bracket and remove timer.
4. Install new timer circuit board as described in
Late
Model Timer
section on the following pages.
5. Refer to Fig. 33 to reconnect the wires.
6. Install the Timer Setting Decal, provided with the
timer replacement kit, on the back of the front
access panel.
7. Adjust the timer as required. Refer to
Late Model
Timer
section on the following pages.
To Three Pin Female
Connector on Main
Harness
BLK to Pump
Lead
WHI to Pump Lead
Three Pin Connector from
Half/Full Batch Switch
FIG. 31 TIMER TERMINALS
P1751
10060 080900
OLD STYLE