Bunn AFPO-3 SL User Manual

21

FIG. 26 VACUUM SWITCHES

Location:

 

The vacuum switches are located inside autofill 

box, mounted on the left side of the solenoid mounting 

bracket just below the needle valves.

 

Test Procedure:

1.  Disconnect  the  dispenser  from  the  power 

source. 

2.  Disconnect flavor input lines.

3.  Disconnect white/red, red/black or the brown/black 

wires on the vacuum switch.

4.   Check for continuity across the switch leads.

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If continuity is not present as described, the vacuum 

switch is operating properly.

If continuity is present as described, without a vacuum 

generated by an empty product concentrate, replace 

the vacuum switch.

Removal and Replacement:

1.  Disconnect dispenser from the power source.

2.  Removal  of  the  two  #8-32  keps  nuts  securing 

the  pump/motor  assembly  nearest  the  vacuum 

switches is required to access the lower vacuum 

switch.

3.  Disconnect the input tubes from the vacuum switch 

to be replaced.

4.  Disconnect the wires on the vacuum switch to be 

removed.

5.  Remove the two #4-40 screws securing the vacuum 

switch to the solenoid bracket. Remove and discard 

switch.

6.  Using two #4-40 screws secure the new vacuum 

switch to the solenoid bracket.

7.  Refer to Fig. 27 and reconnect the wires.

8.  Connect  the  input  tubes  to  the  new  vacuum 

switch.

9.   Restore the pump/motor assembly to its normal 

mounting  position  using  the  two  #8-32  keps 

nuts.           

WHI/RED from Refill ON/OFF Switch #3

WHI/RED to Circuit Board J4-2

RED/BLK from Refill ON/OFF Switch #1

RED/BLK to Circuit Board J4-5

BRN/BLK from Refill ON/OFF Switch #2

BRN/BLK to Circuit Board J4-4

FIG. 27 VACUUM SWITCH TERMINALS

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