Bunn TB3 User Guide
Page 21
SERVICE (cont.)
DILUTION TIMER
4
2
3
1
M
IN
UT
ES
M
IN
UT
ES
M
IN
UT
ES
M
IN
UT
ES
DE
LA
Y
D
IL
UT
IO
N
DE
LA
Y
D
IL
UT
IO
N
BU
NN
-O
-M
AT
IC
BU
NN
-O
-M
AT
IC
P/
N
33
55
P/
N
33
55
5
3
6
4
7
5
6
6
7
8
FIG. 10 DILUTION TIMER
P3040
Location:
The dilution timer is located inside the hood on the
right side. It consists of the dial plate with two dials
and circuit board.
and circuit board.
Test Procedure:
1. Disconnect the brewer from the power source and
1. Disconnect the brewer from the power source and
remove the wires from terminals TL3, TL4, & TL5
of the timer and rotate both dials fully counter-
clockwise.
of the timer and rotate both dials fully counter-
clockwise.
2. With a voltmeter, check the voltage across termi-
nals TL1 and TL2 when the ON/OFF switch is in the
"ON" position. Connect the brewer to the power
source. The indication must be:
"ON" position. Connect the brewer to the power
source. The indication must be:
a) 120 volts ac for two wire 120 volt models.
b) 230 volts ac for two wire 230 volt models.
c) 100 volts ac for two wire 100 volt models.
3. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #4.
If voltage is not present as described, refer to the Wir-
ing Diagrams and check the wiring harness.
If voltage is not present as described, refer to the Wir-
ing Diagrams and check the wiring harness.
4. Check for continuity across the green and red/
black wires when the start switch is held in the
lower position.
lower position.
If continuity is present as described, reconnect the
wires to terminals TL3, TL4, & TL5 of the timer board
and proceed to #5.
If continuity is not present as described, refer to the
Wiring Diagrams and check the wiring harness.
wires to terminals TL3, TL4, & TL5 of the timer board
and proceed to #5.
If continuity is not present as described, refer to the
Wiring Diagrams and check the wiring harness.
5. With a voltmeter, check the voltage across termi-
nals TL1 and TL4 when the ON/OFF switch is in the
"ON" position and the start switch is momentarily
placed in the lower position. Connect the brewer to
the power source. After a delay of approximately
three minutes, the indication must be:
"ON" position and the start switch is momentarily
placed in the lower position. Connect the brewer to
the power source. After a delay of approximately
three minutes, the indication must be:
a) 120 volts ac for two wire 120 volt models for
approximately one minute and then return to its
previous indication.
approximately one minute and then return to its
previous indication.
b) 230 volts ac for two wire 230 volt models for
approximately one minute and then return to its
previous indication.
approximately one minute and then return to its
previous indication.
c) 100 volts ac for two wire 100 volt models for
approximately one minute and then return to its
previous indication.
approximately one minute and then return to its
previous indication.
6. Disconnect the brewer from the power source.
If voltage is present as described, the timer is operat-
ing properly. Adjust the timer dials as required.
If voltage is not present as described, replace the
timer.
ing properly. Adjust the timer dials as required.
If voltage is not present as described, replace the
timer.
Removal and Replacement:
1. Remove all wires from the timer.
2. Remove the circuit board and dial plate from the
1. Remove all wires from the timer.
2. Remove the circuit board and dial plate from the
brackets.
4. Install the new dial plate and circuit board to the
brackets.
5. Refer to Fig. 11 when reconnecting the wires.
6. Adjust the timer dials as required.
6. Adjust the timer dials as required.
FIG. 11 DILUTION TIMER TERMINALS
P1281
GRN to Start Switch
WHI/BLU to Dilution Solenoid
RED/BLK to Start Switch
WHI to Brew Timer (100V &
120V Models)
RED to Brew Timer (230V
Models)
120V Models)
RED to Brew Timer (230V
Models)
WHI/VIO to ON/OFF Switch
37235 080204