Overflow Protection Switch - Bunn Dual TF Operating & Service Manual

SERVICE (cont.)
SERVER SENSOR (cont.)
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.

OVERFLOW PROTECTION SWITCH

N N N N
B U B U
2 2
1. 5 1. 5
1
1
3
.5 .5
5 6
C C
A TI A TI 4 48 48
-M -M 7 24 24
-O -O P /N P /N
N N N N 4 3
B U B U
5 8
3 2
2 2 6 1
1. 5 1. 5
1
1
A C A C
3 0 V 0 V
.5 .5 12 12
00 00
6- 00 6- 00
48 48
24 24
P /N P /N
Location:
The overflow protection switch is located in-
side the hood on the center of the tank inside the
copper overflow cup.
To test the overflow protection switch, access
will also be needed to the level control board or
electronic control assembly and terminal block.
Test Procedure:
1. Disconnect the brewer from the power source.
2. Remove the wire nuts connecting the red wires
from the overflow protection switch to the black
wire from the terminal block and blue wire from the
thermostat or the black wire from the electronic
control assembly.
l
1⁄2 ga
1
1 ga l
l
ga
1⁄2
D Y
R EA
R
C TO
LE
SE
M ER
/ W AR
O N
T
AR
5 ST
C C 6
A TI A TI 4
7
-O -O -M -M
3
4
5 8
3 2
6 1
l ga
1 1⁄2
l
1 ga
l
A C A C 1⁄2 ga
0 V 0 V
12 12
T
6- 00 6- 00 00 00 AR
ST
M ER
AR
/ W
O N
R
C TO
LE
SE
D Y
R EA
3. Check for continuity across the overflow protec-
tion switch red wires only until the plastic float is
raised and check that continuity returns when the
plastic float is again lowered.
If continuity is present as described, reconnect the red
wires to the blue wire from the thermostat or black
wire from electronic control assembly and the black
wire from terminal block.
If continuity is not present as described, replace the
overflow protection switch.
Removal and Replacement:
1. Disconnect the red leads from the overflow pro-
tection switch from the blue wire from the thermo-
stat or black wire from electronic control assembly
and the black wire from the terminal block.
2. Remove the nut beneath the copper overflow cup.
3. Remove the entire switch assembly from the cup.
4. Place the new switch assembly into the cup, wires
first. Make sure that the gasket is in place around
the threaded switch stem.
NOTE - The magnets must be at the top of float and
there must be NO adjusting washers installed for the
overflow protection switch to operate properly.
5. Install the nut beneath the copper overflow cup. Be
sure not to overtighten.
6. Refer to the illustration below when reconnecting
wires.
P981
RED to BLK Wire from
Terminal Block
Page 30
RED to BLU Lead
from Thermostat
P795
27124 050800