Timers (Early Models) - Bunn Dual Service Manual

SERVICE (cont.)

TIMERS (Early Models)

EARLY MODELS
FIG. 42 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 counter-
clockwise.
3. With a voltmeter, check the voltage across terminals
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 two wire 120 volt models, 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.
l
1⁄2 ga
1
1 ga l
ga l
1⁄2
A D Y
RE
O R
LE CT
SE
ER
A RM
/ W
O N
A RT
ST
ga l
1 1⁄2
l
1 ga
l
ga
1⁄2
A RT
ST
ER
A RM
/ W
O N
O R
LE CT
SE
Y
A D
RE
ER
AT
T W
HO
IO N
CA UT
!
P796
NOTE: ECA MODELS ONLY - Brewer must be at op-
erating temperature to perform step 5 or brew-lock
must be bypassed. To bypass brew-lock on DUAL
models, 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. To bypass brew-lock on
SINGLE models, disconnect white/yellow and orange
wires from brew-lock of ECA and connect the harness
leads together.
5. With the start switch pressed, check for continuity
across the wires disconnected from TL3 and TL5 of
the timer. DUAL models will be white/orange and
white/yellow wires for right timer or the orange and
yellow wires for left timer. SINGLE models will be
white/orange and white yellow wires for electro/
mechanical brewers and white/yellow and yellow
wires on electronic brewers.
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 two wire 120 volt models, three
wire 120/208 volt models and three wire 120/240
volt models for approximately 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
gallon batch.
7. Select a 1 gallon batch and repeat #6. The indication
should remain for approximately 40 seconds.
8. Select a 1/2 gallon batch and repeat #6. The indica-
tion should remain approximately 20 seconds.
Removal and Replacement:
1. Remove all wires from the timer.
2. Remove the four #6-32 slotted head screws holding
circuit board and dial plate on to the component
mounting bracket.
3. Remove circuit board, nylon spacers and dial
plate.
Page 37
41976 031709