Bunn CWT TWIN Operating & Service Manual page 17

SERVICE (cont.)
ON/OFF SWITCHES (cont.)
Test Procedure:
1. Disconnect the brewer from the power source.
2. Viewing the switch from the back remove the white
or red wire from the upper terminal and the black
wire from the center terminal.
3. With a voltmeter, check the voltage across the
white wire or red wire and the black wire. Connect
the brewer to the power source. The indication
must be:
a) 120 volts ac for three wire 120/240 models.
b) 200 volts ac for two wire 200 volt models.
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for three wire three phase 230 volt
models.
4. Disconnect the brewer from the power source.
If voltage is present as described, reconnect the white
or red wire and proceed to #5.
If voltage is not present as described, refer to the
Wiring Diagrams and check the brewer wiring har-
ness.
5. With the black wire removed, remove the wire
from the lower terminal.
6. Check for continuity across the center and lower
terminal with the switch in the "ON" position.
Continuity must not be present when the switch is
in the "OFF" position.
If continuity is present as described, reconnect the
black wire to the center terminal and the wire to the
lower terminal.
If continuity is not present as described, replace the
switch.
Removal and Replacement:
1. Remove the wires from the switch terminals.
2. On models with faucet, turn off water supply and
remove faucet.
3. Remove front end cap.
4. Compress the clips inside the hood and gently
push the switch through the opening.
5. Push the new switch into the opening and spread
the clips to hold switch in the hood.
6. Reinstall front end cap.
7. On models with faucet reinstall faucet and connect
brewer to the water supply.
8. Refer to Fig. 7 when reconnecting the wires.
Connect wire to Terminal #1 as follows:
All Models:
Brew Station Warmer (Left) .................................... WHI/RED
Brew Station Warmer (Right) (1 power cord) ........ WHI/GRN
Brew Station Warmer (Right) (2 power cords) ....... WHI/RED
2/2 Models:
Left Upper Warmer ......................................................... YEL
Right Upper Warmer .............................................. WHI/YEL
4/2 Models (1 power cord):
Left Front Upper Warmer ................................................ YEL
Right Front Upper Warmer ..................................... WHI/YEL
Left Rear Upper Warmer .......................................... WHI/VIO
Right Rear Upper Warmer ..................................... WHI/BRN
4/2 Models (2 power cords):
Left Front Upper Warmer ........................................ BRN/BLK
Right Front Upper Warmer ..................................... BRN/BLK
Left Rear Upper Warmer .................................................. VIO
Right Rear Upper Warmer ............................................... VIO
0/6 Models (1 power cord):
Left Front Warmer .......................................................... YEL
Left Rear Warmer .................................................... WHI/VIO
Right Front Warmer ................................................ BRN/BLK
Right Rear Warmer .......................................................... VIO
0/6 Models (2 power cords):
Left Front Warmer .................................................. BRN/BLK
Left Rear Warmer ............................................................ VIO
Right Front Warmer ................................................ BRN/BLK
Right Rear Warmer .......................................................... VIO
FIG. 7 ON/OFF SWITCH WIRING
Page 17
WHI to Terminal Block (White
Insert on 120V or 120/240V
Models)
RED to Terminal Block (Red
Insert on 200V or 230V
Models)
BLK to Terminal Block (Black
Insert)
Terminal #1 (See chart below)
P1918
10737 100801