Brew Timer - Bunn VLPF Operating & Service Manual

SERVICE (cont.)
BREW TIMER (early models)
FIG. 2 BREW TIMER
Location:
The brew timer is located in the hood, to the right
of the tank.
Test Procedure:
1. Disconnect the brewer from the power source
and separate the polarized, three-pin connectors
between the timer and brewer wiring harness and
rotate the brew timer dial fully counterclockwise.
2. With a voltmeter, check the voltage across sockets
2 & 3 (white and black wires) of the female con-
nector when the On/Left switch is in the upper
position. Connect the brewer to the power source.
The indication must be 120 volts ac.
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 Wiring
Diagram and check the brewing harness.
4. With a voltmeter, check the voltage across sockets
1 & 2 (blue and white wires) of the female con-
nector when the On/Left switch is in the upper
position and the Start switch is pressed to the
lower position and held. Connect the brewer to the
power source. The indication must be 120 volts
ac until the Start switch is released.
5. Disconnect the brewer from the power source.
If voltage is present as described, reconnect the po-
larized, three-pin connectors, and proceed to #6. If
voltage is not present as described, refer to the Wiring
Diagram and check the brewer wiring harness.
6. Disconnect the in-line connectors on the black
and white wires from the timer to the wiring har-
ness.
7. With a voltmeter, check the voltage across the
black and white wires when the On/Left switch is in
the upper position and the Start switch is pressed
to the lower position and released. Connect the
brewer to the power source. The indication must
be 120 volts ac for approximately 20 seconds and
then return to its previous indication.
8. Disconnect the brewer from the power source.
If voltage is present as described, the brew timer is
operating properly. Reset the timer dial as required,
P1979.75
to obtain the desired brew volume. If voltage is not
present as described, replace the brew timer.
Removal and Replacement:
1. Separate all connectors between the brewer wiring
harness and the timer.
2. Remove the two #8-32 nuts holding the timer to
the inside of the hood.
3. Install the new timer circuit board as described
in Late Model Timer section on the following
pages.
4. Refer to FIG. 5 when reconnecting the wires.
5. Install the Timer Setting decal provided with the
replacement timer kit, on the bottom of the top
cover.
6. Adjust the timer as required. Refer to Late Model
Timer section on the following pages.
Page 14
WHI to Relay Coil
BLK to Relay Coil
P1 BLU/BLK to Start Switch
P2 WHI to Liquid Level
Board
P3 BLK to Relay
OLD STYLE
FIG. 3 BREW TIMER WIRING
P1980.80
10179 060100