Bunn SRU Guía Del Usuario

Page 1

T1 BLU to Solenoid Valve

T BLK to ON/OFF Switch (All models 

except 30V-CE models- RED on CE 

Models)

T3 WHI to Main Harness

(10/08V and10/40V 

models)

T3 RED to Main Harness

(08V, 40V single phase and 

three phase models)

T3 BLK  to Main Harness

(30V two wire models)

T4 PIN to Level Probe

FIG.13 LIQUID LEVEL BOARD TERMINALS

P1733

 Voltage - 

Jumper

Not Touching

Frame

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

Voltage -

Jumper

Touching

Frame

0

0

0

0

10067 040100

14. Disconnect the brewer from the power source.

If voltage is present as described, reinstall the level 

probe, the liquid level board and level probe are oper-

ating properly.

If voltage is not present as described, check the pink wire 

on the level probe from liquid level board terminal.

Removal and Replacement:

1.  Remove all wires from the liquid level board.

.  Remove the #10-3 screw and flat washer securing 

the protective shield to the component bracket.

3.  Remove  the  #10-3  screw  and  internal  tooth 

lockwasher securing the liquid level board to the 

component bracket.

4.  Remove liquid level board and discard.

5.  Install new liquid level board on component bracket 

and secure with a #10-3 screw and internal tooth 

lockwasher.

6.  Install  protective  shield  and  secure  with  #10-3 

screw and flat washer.

7.  Refer to Fig. 13 and reconnect the wires.

8.  Disconnect the brewer from the power source and 

remove the jumper wire from T4.

If voltage is present as described, liquid level board is 

operating properly, proceed to #9.

If voltage is not present as described, replace the liquid 

level board.

9.  Reconnect the pink wire to T4.

10. Remove the two #8-3 screws securing the level 

probe to the component bracket.

11. Gently pull the probe out of the component bracket 

and inspect for corrosion. Replace if necessary.

1  Place the probe so that neither end is in contact 

with any metal surface of the brewer.

13. Connect the brewer to the power source. Check 

the voltage across T1 and T3, refer to chart below. 

Keep in mind there is an approximate delay of five 

seconds for output to stabilize.

10V

30V

08V or

40V