SERVICE (cont.)

CONTROL THERMOSTAT

FIG. 6 CONTROL THERMOSTAT

P2209.60

 

Location:

The control thermostat is mounted on the right front of the component bracket.

Test Procedures:

1.Disconnect the brewer from the power source.

2.Locate the thermostat and the voltage check points.

3.Connect the brewer to the power source.

Model

Check Voltage Across

Voltage

120/208V & 120

Black wire on thermostat

120V

240V - 3 wire w/

from main harness to white

 

ground single phase

wire in terminal block.

 

not be present when the thermostat is in the "OFF" position (fully counterclockwise).

If continuity is present as described, the control ther- mostat is operating properly.

If continuity is not present as described, replace the control thermostat.

Removal and Replacement:

1.

Disconnect the wires from the control thermo-

 

stat.

2.

Remove the thermostat capillary bulb by firmly

 

pulling up on the capillary at the component

 

bracket. This will disengage the grommet from

 

the component bracket.

3.

Remove the #8-32 screw securing the control

 

thermostat and mounting bracket to the component

 

bracket. Remove control thermostat and bracket

 

as an assembly.

4.

Remove knob from control thermostat.

5.

Remove the two #6-32 screws securing the control

 

thermostat to the thermostat mounting bracket.

 

Remove and discard thermostat.

6.

Install new control thermostat on thermostat

 

mounting bracket and secure with two #6-32

 

screw.

7.

Install knob on thermostat.

8.

Install thermostat and mounting bracket on the

 

component bracket and secure with one #8-32

230V - 2 wire w/ ground single phase

208V or 240V - 2 wire w/ground single phase

280V or 440V - 4 wire w/ground 3 phase

380V - 3 wire w/ ground 3 phase w/ stepdown

transformer

Red wire on thermostat

230V

from main harness to black

 

wire in terminal block.

 

Black wire on thermostat

208V or

from main harness to red

240V

wire in the terminal block.

 

Black wire on thermostat

220V or

from main harness to white

254V

wire in terminal block.

 

Black wire on thermostat

120V

from main harness to white

 

wire on step down trans-

 

former.

 

screw.

9. Carefully bend the capillary tube so that the tube

and bulb inside the brewer are in the vertical posi-

tion.

NOTE: The capillary tube must be clear of any electrical termination and not kinked.

10.Refer to Fig. 7 and reconnect the wires.

11.Adjust the control thermostat as required.

BLK from Main Har- ness (All Models Ex- cept 230V CE Models RED from Main Harness (230V CE 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 theWiring Diagrams and check the brewer wiring harness.

5.Disconnect the black wires from the control ther- mostat.

6.Check for continuity across the terminals on the control thermostat with the control thermostat in the "ON" position (fully clockwise), continuity must

BLK to Limit Thermostat (All Models Except 230V CE Models

RED to Limit Thermostat (230V CE Models)

P1730.80

FIG. 7 CONTROL THERMOSTAT TERMINALS

Page 17

10060

080900

 

Page 17
Image 17
Bunn U3A service manual Control Thermostat

U3A, U3 specifications

Bunn U3A, also known as Bunn's U3A, is a unique and innovative approach to education that caters specifically to retirees and senior citizens. The primary aim of this initiative is to foster lifelong learning and social engagement among older adults, empowering them to explore various subjects of interest and connect with like-minded individuals.

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