Bunn AFPO-3 SL 用户手册

16

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 block-

age 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 solenoid 

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

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

41093 040408