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Location:
The server sensor is attached to the bottom side of
the server platform.
With brew selector switch in the 1/2 gallon position the
server sensor will allow a brew cycle to start with a 1/2
gallon server only.
With brew selector switch in the 1 gallon or 1-3/4
gallon position the server sensor will allow a brew cycle to
start with a 1-3/4 gallon server only.
If the correct server is used for the selected batch size
and the brew cycle will not start, procede with the test
procedures.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Disconnect the terminal plug on the wiring harness
from terminal plug on the server sensor.
3. Check the voltage across the gray wire (pin #1) and the
white wire or red wire (pin #2) on the wiring harness
with a voltmeter and with the "ON/OFF" switch 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 on 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 the brewer wiring harness.
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/yellow
and orange wires from interlock of ECA and connect
harness leads together.
5. Disconnect the white/yellow wire from timer terminal
TL5.
6. Check for continuity between the white/yellow wire
disconnected from timer terminal TL5 and the yellow
wire (pin #4) on the server sensor terminal plug of the
wiring harness with the brew selector switch in the 1/
2 batch position and the start switch depressed.
7. Select the 1 gallon or 1-3/4 gallon setting on the brew
selector switch.
8. Check for continuity between the white/yellow wire
disconnected from timer terminal TL5 and the orange
wire (pin #3) on the server sensor terminal plug of the
wiring harness and the start switch depressed.
9. Reconnect the white/yellow to timer terminal TL5 and
brew-lock if necessary.
10. Disconnect the pink wire from timer terminal TL3.
11. Check continuity between the pink wire removed from
timer terminal TL3 and the pink wire (pin #5) on the
server sensor terminal plug of the wiring harness.
12 Reconnect the pink wire to timer terminal TL3.
If continuity is present as described the server sensor
wiring is operating properly. Replace the server sensor.
If continuity is not present as described refer to the wiring
diagrams and check brewer wiring harness.
Removal and Replacement:
1. Remove the four #6-32 slotted head screws securing
the server platform to the brewer base.
2. Lift server platform high enough to be able to discon-
nect the server sensor terminal plug from the terminal
plug on the wiring harness. Disconnect the plugs.
3. Turn the server platform over and remove the two #8-
32 Keps nuts securing the server sensor to the weld
stud on the server platform.
4. Remove the server sensor leaving the two spacers in
place.
5. Install new server sensor on the weld studs and secure
with two #8-32 Keps nuts.
6. Reconnect the terminal plug on the server sensor to
the terminal plug on the wiring harness.
7. Reinstall server platform on the brewer base using
four #6-32 Slotted head screws.
SERVER SENSOR
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BUNN
90 psig max operating pressure
Strainer/Flow Control # 22300.033 0
(Repl. Flow Washer #20526.0330)
(Repl. Screen #23721.0000)
.500 gpm FLOW
P1009
SERVICE (cont.)
27118 100400