Bunn DUAL - Water Temperature Control Flow Charts; Water Not Hot Enough Troubleshooting

Page 25
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 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 and red wires from the
electronic control assembly.
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 and
Liquid Level Control and the black wire from terminal
block or black and red wires from electronic control
assembly.
If continuity is not present as described, replace the
overflow protection switch.
Removal and Replacement:
1. Disconnect the red leads from the overflow protec-
tion switch from the blue wire from the thermostat
and the black wire from the terminal block or black
and red wires from electronic control assembly.
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 Fig. 25 when reconnecting wires.
P795
START ON / WARMER
SELECTOR
READY
READY
O
N / WARMER
STAR
T
1
1
⁄2
gal1
g
a
l
1⁄2
gal
SELECTOR
1
1⁄2
gal
1 gal
1⁄
2
ga
l
BUNN
90 psig max operating pressure
Strainer/Flow Control # 22300.0750
(Repl. Flow Washer #20526.0750)
(Repl. Screen #23721.0000)
.500 gpm FLOW
TL5
TL4
TL3
TL2
TL1
J2
J1
SET
LOCK
LOCK
SET
TL5
TL4
TL3
TL2
TL1
J2
J1
SET
LOCK
LOCK
SET
OVERFLOW PROTECTION SWITCH
P2194
SERVICE (cont.)
FIG. 24 OVERFLOW PROTEC-
TION SWITCH
FIG. 25 OVERFLOW PROTECTION
SWITCH TERMINALS
RED to BLU Lead
from Thermostat &
Liquid Level Control
or
RED to RED Lead
from J3-11
REDtoBLKWire
form Terminal Block
or
REDtoBLKLead
from J3-12
41976 031709