Bunn SRU Guía Del Usuario

Page 17

FIG. 6 CONTROL THERMOSTAT

P113.40

Location:

 

The control thermostat is mounted on the left front 

of the top component bracket.

Test Procedures:

1.  Disconnect the brewer from the power source.

.  Locate  the  thermostat  and  the  voltage  check 

points.

Model

10/08V & 

10/40V - 3-

wire w/ground

single phase

30V - -wire 

w/ground single

phase

08V or 40V - 

-wire w/ground

single phase

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.  Disconnect the black or red wires from the control 

thermostat.

6.  Check for continuity across the terminals on the 

control thermostat with the control thermostat in 

the "ON" position (fully clockwise), continuity must 

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.

.  Remove the thermostat capillary bulb by firmly pull-

ing up on the capillary at the component bracket. This 

will disengage the grommet from the component 

bracket.

3.  Remove  the  #8-3  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 #6-3 screws securing the control 

thermostat  to  the  thermostat  mounting  bracket. 

Remove and discard thermostat.

6.  Install new control thermostat on thermostat mount-

ing bracket and secure with two #6-3 screw.

7.  Install knob on thermostat.

8.   Install  thermostat  and  mounting  bracket  on  the 

component bracket and secure with one #8-3

 

screw.

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

bulb inside the brewer are in the vertical position. 

The tube should extend an additional 5.5", above 

the bulb into the brewer.

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.

Check Voltage Across

Black  wire  on  therostat 

from main

harness to white wire

in terminal block.

Red wire on thermo-

stat from main

harness to black wire

in terminal block.

Black wire on thermo-

stat from main

harness to red wire in

the terminal block.

Voltage

10V

30V

08V or

40V

10067 040100

P1730

FIG. 7 CONTROL THERMOSTAT TERMINALS

BLK from Main Har-

ness (All Models Ex-

cept 30V CE Models

RED from Main 

Harness (30V CE 

Models)

BLK to Limit Thermostat 

(All Models Except 30V CE 

Models

RED to Limit Thermostat 

(30V CE Models)