Bunn CWTF TWIN Guía Del Usuario

Page 17

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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 harness.

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.

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

P1918

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)

FIG. 7 ON/OFF SWITCH WIRING