Bunn CWT Service Manual download pdf (Page 15)

Page 15

SERVICE (cont.)

CONTROL THERMOSTAT

MODEL CWT

MODEL SINGLE CW

Location:

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 and the red insert

on two wire 200 volt or 240 volt terminal block

with a voltmeter. Connect the brewer to the power

source. The indication must be:

a) 120 volts ac for two wire 120 volt models and

three wire 120/240 volt models.

b) 200 to 230 volts ac for two wire 200 volt or

230 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 thermo-

stat.

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 and the red insert on the two pole 200 volt

or 230 volt terminal block with a voltmeter when

the control thermostat is turned fully clockwise.

Connect the brewer to the power source. The

indication must be:

a) 120 volts ac for two wire 120 volt models and

three wire 120/240 volt models.

b) 200 to 230 volts ac for two wire 200 volt or

230 volt models.

8. Disconnect the brewer from the power source.

If voltage is present as described, reinstall the capil-

lary tube into the tank to the line 4.5" (6.0" for Single

CW models) 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 ﬁrmly

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 con-

trol thermostat to the component bracket in the

trunk.

MODEL C

P1153

10841 071000

FIG. 2 THERMOSTAT LOCATION

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 31 32

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Bunn CWT Service Manual Page 15

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