Bunn AFPO-3 SL manual Vacuum Switches, SERVICE cont

SERVICE (cont.)

VACUUM SWITCHES

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2	3
3
FIG. 26 VACUUM SWITCHES		P1521

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.

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
#3	#1
	BRN/BLK from Refill ON/OFF Switch #2
	BRN/BLK to Circuit Board J4-4
	#2
	FIG. 27 VACUUM SWITCH TERMINALS	P1527
	21	41093 040408