Bunn CWTF TWIN Guía Del Usuario

Page 15

Location:

 

 The control thermostats are located inside the 

trunk on the left side of the component brackets.

Test Procedures:
1.   Disconnect the brewer from the power source.
2.   With a voltmeter, check the voltage across the 

blue wire on the   control  thermostat    and  the 
white insert  on  three pole 120/240 volt terminal 
block and the red insert on two wire 200 volt ,240 
volt or  the three wire three phase 230 volt terminal 
block. Connect the brewer to the power source. 
The indication must be:

 

a) 120 volts ac for three wire 120/240 volt mod-
els.

 

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.

3.  Disconnect the brewer from the power source.

If voltage is present as described, proceed to #4.
If voltage is not present as described, refer to the Wiring 
Diagrams and check the brewer wiring harness.
4.  Gently remove the capillary bulb and grommet 

from the tank.

5.  With a voltmeter, check the voltage across the black 

wire of the control thermostat and the white insert 
on the three pole 120/240 volt terminal block and 
the red insert on the two pole 200 volt,240 volt 
or the three wire three phase 230 volt terminal 

block when the control thermostat is turned fully 
clockwise. Connect the brewer to the power source. 
The indication must be:

 

a) 120 volts ac for three wire 120/240 volt mod-
els.

 

b) 200  volts ac for two wire 200 volt volt models.

 

c) 240 volts ac for two wire 240 volt models.

 

d) 230 volts ac for three wire three phase 230 volt 
models.

6.   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 ther-
mostat.

Removal and Replacement:
1.   Remove wires from control thermostat leads.
2.  Remove the thermostat capillary bulb by fi rmly
 

pulling up on the capillary at the tank lid. This will 
disengage the grommet from the tank lid.

3.  Remove the one #8-32 screw securing the control 

thermostat to the component bracket in the trunk. 

4.  Slide the grommet to the line 4.5" above the bulb 

on the new capillary tube.

5.   Insert the capillary bulb through the hole in the tank 

lid and press the grommet fi rmly and evenly so that 
the groove in the grommet fi ts into the tank lid.

6.  Carefully bend the capillary tube so that the tube and 

bulb inside the tank are in the vertical position.

NOTE -  The capillary tube must be clear of any electrical 

termination and not kinked.

7.  Using one #8-32 screw secure the control thermostat 

to the component bracket inside the trunk.

8.  Refer to Fig. 3 when reconnecting the wires.
9.  Adjust the control thermostat as required.

FIG. 2 CONTROL THERMOSTAT

P2197

10737 120800

P1129

FIG. 3 CONTROL THERMOSTAT LEADS

BLU to BLU Lead from 
Limit Thermostat

BLK to BLK Lead from Tank Heater 
(Brewers W/Out Faucet)
BLK to BLK Fused Lead from Tank 
Heater (Brewers with Faucet)