Bunn AFPO-2 User Manual download pdf (Page 16)

SERVICE (cont.)

SOLENOIDS

FIG. 16 SOLENOIDS

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.

FIG. 17 SOLENOID TERMINALS

P1521

P1544

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.

#1 AFPO-2

& 3

#2 AFPO-2

& 3

#3 AFPO-3

ONLY

WHI from Main Harness

WHI to Solenoid #2

BLU from Solenoid

Switch #1

WHI to Solenoid #1

WHI to Pump #1

VIO from Solenoid

Switch #2

WHI/VIO from

Solenoid Switch #3

WHI to Main

Harness

WHI to Pump #3

28791 040501

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 24 25

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Bunn AFPO-2 User Manual Page 16

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