Limit Thermostat - Bunn Dual Service Manual

SERVICE (cont.)

LIMIT THERMOSTAT

FIG. 20 LIMIT THERMOSTAT
Location:
The limit thermostat is located inside the hood on
the tank lid just to the left of the right tank heater.
Test Procedure:
1. Disconnect the brewer from the power supply.
2. Disconnect the black wire from the limit thermostat
to the terminal block.
3. With a voltmeter, check the voltage across the
black wire removed from the limit thermostat and
the black wires to the tank heater terminals.
4. Connect the brewer to the power supply.
5. 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 for two wire 200 or 240
volt models.
6. Disconnect the brewer from the power supply.
l
ga
1 1⁄2
1 ga l
l
ga
1⁄2
D Y
R EA
R
TO
LE C
S E
M ER
A R
/ W
O N
A R T
S T
ga l
1⁄2
1
l
1 ga
l
ga
1⁄2
A R T
S T
M ER
AR
/ W
O N
R
C TO
S E LE
D Y
R EA
P790
If voltage is present as described, reconnect the black
wire to the limit thermostat from the terminal block,
the limit thermostat is operating properly.
If voltage is not present as described, refer to the Wiring
Diagrams and check brewer wiring harness.
Removal and Replacement:
1. Remove all wires from the limit thermostat termi-
nals.
2. Carefully remove the two #8-32 nuts securing
the limit thermostat to tank lid and remove limit
thermostat.
3. Carefully secure new limit thermostat to tank
lid.
4. Refer to Fig. 21 when reconnecting the wires.
BLK to Terminal Block
(Black Insert)
FIG. 21 LIMIT THERMOSTAT
Page 23
BLK to Contactor Terminal
TERMINALS
P791
41976 031709