Bunn AFPO-2 SL service manual Solenoids, #1 AFPO-2, 3 #2 AFPO-2, 3 #3 AFPO-3 ONLY, SERVICE cont

SERVICE (cont.)

SOLENOIDS
					1
			REFIL	L	2
			3		MAIENR
					POW
			R
			ATET
			WINPU
		1	1
		FLUATVPOURT	OR
			FILNAPVUT
		O	2
	2	ER
		WATPUT	3
		OUT
	OR
	FLAVPUT
	OUT
3	ER
	WATPUT
	OUT
R
AVOUT
OFLUTP
ER
WATPUT
OUT
FIG. 16 SOLENOIDS					P1521

Location:

The solenoids are located inside the autofill box.

Test Procedure:

1.Disconnect the dispenser from the power source.

2.Disconnect the white/violet, violet or blue wire and the white wire from the solenoid.

3.Connect the dispenser to the power source. Press the solenoid (water) switch, and with a voltmeter, check the voltage between the white wire, and either the blue, violet, or white/violet wire. The indication must be:

a)120 volts ac for two wire 120 volt models.

b)200 to 240 volts ac for two wire 200 or 240 volt models.

c)230 volts ac for two wire 230 volt models.

4.Disconnect the dispenser 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 dispenser wiring harness.

5.Check for continuity across the solenoid valve coil terminals.

If continuity is present as described, refer to Fig. 17 and reconnect the wires to the solenoid.

If continuity is not present as described, replace the solenoid valve.

6.Check the solenoid valve for coil action. Connect the dispenser to the power source. Press the solenoid (water) switch and listen carefully in the vicinity of the solenoid valve for a "clicking" sound as the coil magnet attracts.

7.Disconnect the dispenser from the power source.

If the sound is heard as described and water will not pass through the solenoid valve, there may be a blockage in the water inlet before the solenoid valve or, the solenoid valve may require inspection for wear, and removal of waterborne particles.

If the sound is not heard as described, rebuild or replace the solenoid valve.

Solenoid Valve Repair:

1.Remove the wires from the solenoid valve to be repaired.

2.Turn off the water supply to the dispenser.

3.Remove the nut securing solenoid valve coil to the base.

4.Remove guide, washer, o-ring, plunger/spring and inspect for wear. Replace parts as required.

5.Install new o-ring in the solenoid valve base.

6.Install plunger/spring in the guide with spring to the bottom of the guide.

7.Install guide with the plunger/spring into the sole- noid valve base.

8.Install washer on guide.

9.Install coil with retainer on guide and secure with nut.

10.Refer to Fig. 17 and reconnect the wires.

WHI from Main Harness
WHI to Solenoid #2	WHI to Solenoid #1
BLU from Solenoid
	WHI to Pump #1
Switch #1
	VIO from Solenoid
	Switch #2
	WHI/VIO from
	Solenoid Switch #3
	WHI to Main
	Harness
#1 AFPO-2	WHI to Pump #3
& 3 #2 AFPO-2

&3 #3 AFPO-3

ONLY

FIG. 17 SOLENOID TERMINALS P1544

16 28791 040501