Timers (Early Models) - Bunn Dual Operating & Service Manual

SERVICE (cont.)

TIMERS (Early Models)

EARLY MODELS
FIG. 32 TIMERS
Location:
The timers are located inside the left front of the
brewer on the upper part of the component bracket.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Disconnect the wires from the timer terminals
TL3, TL4 and TL5 and rotate the dial(s) fully
counterclockwise.
3. 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:
a.) 120 volts ac for three wire 120/208 volt models
and three wire 120/240 volt models.
b.) 200 to 240 volts ac for two wire 200 or 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
Wiring Diagrams and check brewer wiring harness.
ga l
1⁄2
l 1
1 ga
l
ga
1⁄2
Y
A D
R E
O R
C T
LE
S E
M E R
A R
/ W
O N
A R T
S T
l
ga
1 1⁄2
l
1 ga
l
1⁄2 ga
A R T
S T
M E R
A R
/ W
O N
O R
C T
LE
S E
Y
A D
R E
ER
AT
T W
H O
N
TI O
C AU
!
P796
NOTE: ECA MODELS ONLY - Brewer must be at
operating temperature to perform step 5 or brew-lock
must be bypassed. To bypass brew-lock disconnect
white/orange wire and brown/black wire for right timer
or orange wire and red/black wire for left timer from
brew-lock of ECA and connect the harness leads
together.
5. Check for continuity across the white/orange wire
and white/yellow wire from the right timer or the
orange wire and yellow wire on the left timer when
the start switch is pressed.
If continuity is present as described, reconnect the
wires to terminals TL3, TL4 and TL5 of the timer board
and brew-lock wires if necessary, and proceed to #6.
6. Check the voltage across terminals TL1 and TL4
with a voltmeter 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:
a.) 120 volts ac for three wire 120/208 volt models
and three wire 120/240 volt models for approxi-
mately 1 minute for 1-1/2 gallon batch.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models for approximately 1 minute for 1-1/2 gal-
lon batch.
7. Select a 1 gallon batch and repeat #6. The indica-
tion should remain for approximately 40 seconds.
8. Select a 1/2 gallon batch and repeat #6. The
indication should remain approximately 20 sec-
onds.
Removal and Replacement:
1. Remove all wires from the timer.
2. Remove the four #6-32 slotted head screws hold-
ing circuit board and dial plate on to the compo-
nent mounting bracket.
3. Remove circuit board, nylon spacers and dial
plate.
4. Install new timer circuit board as described in
Digital Timer section on the following pages.
5. Refer to Fig. 36 when reconnecting wires.
6. Install the timer setting decal provided with the
replacement timer kit, on the inside of the front
access panel.
7. Adjust timer as required. Refer to Digital Timer
section on the following pages.
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