Bunn CWT-TS - Manual (Page 15)

Page 15
SERVICE (cont.)
CONTROL THERMOSTAT
1
2
3
4 5
.5
MINUTES BUNN-O-MATIC P/N 2235-120 VAC
USE COPPER WIRE ONLY FOR POWER SUPPLY CONNECTIONS
B U N N
C W S E R IE S
R E A D Y
LATE
MODELS
Location:
Early Models: The control thermostat is mounted
on a bracket inside the hood on the right side just in
front of the tank lid.
Late Models: The control thermostat is located
inside the trunk on the left side of the component
bracket.
Test Procedures:
1.
Disconnect the brewer from the power source.
2. Locate the blue wire on the control thermostat.
3. Check the voltage across the blue wire on the
control thermostat and the white insert on two
pole 120 volt terminal block or three pole 120/
240 volt terminal blocks with a voltmeter. Connect
the brewer to the power source. The indication
must be 120 volts ac for two wire 120 volt models
and three wire 120/240 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.
5. Locate the black wire on the control thermostat.
6. Gently remove the capillary bulb and grommet
from the tank.
7. Check the voltage across the black wire of the
control thermostat and the white insert on the
two pole 120 volt or three pole 120/240 volt
terminal block with a voltmeter when the control
thermostat is turned "ON" (Fully clockwise).
Connect the brewer to the power source. The
indication must be 120 volts ac for two wire 120
volt models and three wire 120/240 volt models.
8. Disconnect the brewer from the power source.
If voltage is present as described, reinstall the capillary
tube into the tank to the line 4.5" above the bulb, the
control thermostat is operating properly.
If voltage is not present as described, replace the
thermostat.
Removal and Replacement:
1.
Remove wires from control thermostat leads.
2. Remove the thermostat capillary bulb by
firmlypulling-up on the capillary at the tank lid.
This will disengage the grommet from the tank
lid.
1 2
3
4
5
.5
MINUTES BUNN-O-MATIC P/N 2235-120 VAC
USE COPPER WIRE ONLY FOR POWER SUPPLY CONNECTIONS
BUNN
C W S E R IE S
R E A D Y
EARLY
MODELS
P1137
P1127