Bunn AFPO-3 SL - Manual (Page 21)

21
VACUUM SWITCHES
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.
SERVICE (cont.)
P1521
1
2
2
1
1
2
3
3
3
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.
#1
#2
#3
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
P1527
41093 040408