Timer (Early Models) - Bunn CWT TWIN Operating & Service Manual

SERVICE (cont.)
TIMERS (Early Models)
O N
O N
T
A
N
K
O F
F
O F
F
FIG. 19 TIMERS
Location:
The timers are located inside the front of the
trunk on the upper right side of component brackets.
Test Procedure.
1. Disconnect the brewer from the power source.
2. Disconnect the polarized, three pin connector from
the brewer wiring harness and rotate the brew
timer dial fully counterclockwise.
3. With a voltmeter, check the voltage across sockets
P2 & P3 (white and black wires) of the female
connector when the "ON/OFF" switch is in the "ON"
upper position. Connect the brewer to the power
source. The indication must be:
a) 120 volts ac for three wire 120/240 volt models.
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.
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 har-
ness.
5. With a voltmeter, check the voltage across the
sockets P1 & P2 (blue and white wires) of the
female connector when the "ON/OFF" switch is in
the "ON" upper position and start switch pressed.
Connect the brewer to the power source. The
indication must be:
a) 120 volts ac for three wire 120/240 volt models.
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.
S
IE
R
E
S
W
C
Y
D
A
E
R
N
N
U
B
P
TO
S
T
IE AR
R ST
E
S
W
C W ER
/L O
O N
Y
D
A
E
R
N
N
U
B
P
TO
T
AR
ST
W ER
/L O
O N
P1233
Page 24
6. Disconnect the brewer from the power source.
7. Reconnect the three pin connector from main
wiring harness to the timer.
If voltage is present as described, proceed to #7
If voltage is not present as described, refer to Wiring
Diagrams and check the brewer wiring harness.
7. Disconnect black and white wires to the solenoid.
8. 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
is pressed and released. Connect the brewer to the
power source. The indication must be:
a) 120 volts ac for approximately 20 seconds for
three wire 120/240 volt models.
b) 200 volts ac for approximately 20 seconds for
two wire 200 volt models.
c) 240 volts ac for approximately 20 seconds for
two wire 240 volt models.
d) 230 volts ac for approximately 20 seconds for
three wire three phase 230 volt 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. Disconnect the timer socket from the brewer wir-
ing harness and the timer leads from the solenoid
valve.
2. Remove the one #8-32 screw securing timer to
component bracket.
3 Install new timer circuit board as described in Late
Model Timer section on the following pages.
4. Refer to Fig. 22 when reconnecting the wires.
5. Install the Timer Setting Decal, provided with the
replacement timer kit, to the side of the electrical
schematic on the inside of the front access panel.
6. Adjust the Timer as required. Refer to Late Model
Timer section on the following pages.
FIG. 20 TIMER TERMINALS
Early Models
To Main Harness
WHI to Solenoid Valve
BLK to Solenoid Valve
P1136
10737 120800