Bunn TW Guía Del Usuario

Page 24

FIG. 16 DILUTION SOLENOID VALVE

P2198.50

Location:

Viewing the brewer from the rear the dilution so-

lenoid is mounted on the right side of the solenoid
mounting bracket which is secured to the trunk base.

Test Procedure:
1. Disconnect the brewer from the power source.
2. With  a  voltmeter,  check  the  voltage  across  the

white/blue and white/violet wires on the dilution
solenoid  terminals  when  the  TEA/OFF/COFFEE
switch  is  in  the  “TEA”  position  and  the  START
switch is momentarily placed in the lower posi-
tion.    Connect  the  brewer  to  the  power  source.
The indication must be 120 volts ac for two wire
120 volt models and three wire 120/208 volt mod-
els.

3. Disconnect the brewer from the power supply.

If voltage is present as described, proceed to #4.
If voltage is not present as described, refer to the 

Wir-

ing Diagrams and check the wiring harness.

4. Remove both wires from the coil and check for

continuity across the coil terminals.

If  continuity  is  present  as  described,  reconnect  the
white/blue and white/violet wires and proceed to #5.
If continuity is not present as described, replace the
solenoid valve.

5. Check the solenoid valve for coil action.  Connect

the brewer to the power source, place the TEA/
OFF/COFFEE switch in the “TEA” position and mo-
mentarily place the START switch in the lower po-
sition and release.  Listen carefully  in the vicinity
of the solenoid valve for a “clicking” sound as the
coil magnet attracts.

6. Disconnect the brewer 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 line before or after 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,  replace  the
solenoid valve.

Removal and Replacement:
1. Remove all wires from the solenoid valves.
2. Turn off the water supply to the brewer.
3. Disconnect the water lines to and from the sole-

noid valves.

4. Remove  the  two  #8-32  keps  nuts  holding  the

mounting bracket to the trunk base.

5. Lift out the bracket.
6. Remove the two #10-32 slotted-head screws hold-

ing the solenoid valve to the mounting bracket.

7. Securely  install  the  new  solenoid  valve  to  the

mounting bracket.

8. Attach the mounting bracket to the trunk base.
9. Securely  fasten  the  water  lines  to  and  from  the

solenoid valves.

10. Refer to Fig. 17  when reconnecting the wires.

FIG.17 SOLENOID VALVE TERMINALS

P1364

HOT COFFEE
BREW SOLENOID

ICED TEA BREW
SOLENOID

DILUTION
SOLENOID

WHI/BLU to Iced
Tea Brew Timer
TL4

WHI/VIO to Iced
Tea Brew Timer
TL1

10510  081599