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Removal and Replacement:
1. Disconnect the red leads from the overflow pro-
tection switch from the black wire from the termi-
nal block and the blue wire from the thermostat.
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 a 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 prop-
erly.
5. Install the nut beneath the copper overflow cup. Be
sure not to overtighten.
6. Refer to Fig. 17 when reconnecting wires.
OVERFLOW PROTECTION SWITCH
SERVICE (cont.)
Location:
The overflow protection switch is located inside
the hood on the tank inside the copper overflow cup.
To test the overflow protection switch, access will
also be needed to the level control board 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.
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 black wire from the terminal block and the
blue wire from the thermostat.
If continuity is not present as described, replace the
overflow protection switch.
P834
FIG. 16 OVERFLOW PROTECTION SWITCH
FIG. 17 OVERFLOW PROTECTION SWITCH
LEADS
22978.0000
TL5
TL4
TL3
TL2
TL1
J2
J
1
S
E
T
L
O
C
K
LOCK
SET
1
2
3
4
5
6
1 2 3 4 5 6
BUNN
90 psig max operating pressure
Strainer/Flow Control # 22300.033 0
(Repl. Flow Washer #20526.0330)
(Repl. Screen #23721.0000)
.500 gpm FLOW
P2230
RED to BLU Lead
from Thermostat or to
VIO Wire from Electronic
Control Assy
RED to BLK Wire from
Terminal Block
28230 092200