Bunn TU5Q Manual De Propietario
Page 16
4
2
3
1
MINUTES
MINUTES
BUNN
-O-MATI
C
P/N 0579
1-00
06 12
0 V
AC
5
3
6
4
7
5
6
6
7
8
SERVICE (cont.)
BREW TIMER
BREW TIMER
FIG. 6 BREW TIMER
P2143.35
Location:
The brew timer is located in the hood. It consists
of the dial plate and circuit board.
Test Procedure:
1. Disconnect the brewer from the power source.
2. Remove the wires from terminals TL3, TL4, & TL5
of the timer and rotate the dials fully counterclock-
wise.
3. With a voltmeter, check the voltage across ter-
minals 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 2-wire 120 volt models.
b) 120 volts ac for 3-wire 120/208 and 120/240
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 Wir-
ing Diagram and check the wiring harness.
5. Check for continuity across the white/orange and
white/yellow wires when the start switch is held
in the lower position.
If continuity is present as described, reconnect the
wires to terminals TL3, TL4, & TL5 of the timer board
and proceed to #6.
If continuity is not present as described, refer to the
Wiring Diagram and check the wiring harness.
6. 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. The indication must be:
a) 120 volts ac for 2-wire 120 volt models for
approximately twenty seconds and then return
to its previous indication.
b) 120 volts ac for 3-wire 120/208 and 120/240
volt models for approximately twenty seconds and
then return to its previous indication.
7. 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.
Removal and Replacement:
1. Remove all wires from the timer.
2. Remove the circuit board and dial plate from the
brackets.
3. Install the new dial plate and circuit board to the
brackets.
4. Refer to Fig. 7 when reconnecting the wires.
5. Adjust the timer dials as required.
FIG. 7 BREW TIMER TERMINALS
10777 041500
4
2
3
1
MI
NU
TE
S
MIN
UT
ES
BU
NN
-O
-M
AT
IC
P/N
0
57
91
-00
06
12
0 V
AC
5
3
6
4
7
5
6
6
7
8
TL3-WHI/ORA to Start Switch
TL2-WHI to ON/OFF Switch
TL2-WHI to Terminal Block
TL1-WHI/VIO to Brew Solenoid Valve
TL1-WHI/VIO to ON/OFF Switch
TL4-WHI/GRN to Brew Solenoid Valve
TL5-WHI/YEL to Start Switch
P2145