SERVICE (cont.)

 

 

 

SWEETENER SOLENOID VALVE (OPTIONAL)

5.

Check the solenoid valve for coil action. Connect

 

 

the brewer to the power source, place the

 

 

OFF/SELECTOR switch in the ÒSWEETÓ position

 

 

and momentarily place the start switch in the lower

 

 

position and release. At the start of a brew cycle,

 

 

listen carefully in the vicinity of the solenoid valve

 

 

for a ÒclickingÓ sound as the coil magnet attracts

 

 

and at the end of the brew cycle when the plunger

 

 

is released.

 

 

6.

Disconnect the brewer from the power source.

 

If the sound is heard as described and sweetener will

P2844

not pass through the solenoid valve, there may be a

FIG. 18 SWEETENER SOLENOID VALVE

blockage in the sweetener line before or after the so-

Location:

lenoid valve or, the solenoid valve may require inspec-

tion for wear, and removal of particles.

 

Viewing the brewer from the front, the sweetener

If the sound is not heard as described, replace the

solenoid is mounted on the left side of the solenoid

solenoid valve.

 

mounting bracket which is secured to the bottom base

 

 

 

housing.

Removal and Replacement:

 

Test Procedure:

1.

Remove all wires from the solenoid valves.

 

2.

Turn off the sweetener supply to the brewer.

 

1. Disconnect the brewer from the power source.

3.

Disconnect the water lines to and from the sole-

2. With a voltmeter, check the voltage across the

 

noid valves.

 

brown/white and white/violet wires on the sweet-

4.

Remove the two #8-32 keps nuts holding the

ener solenoid terminals when the OFF/SELECTOR

 

mounting bracket to the trunk base.

 

switch is in the ÒSWEETÓ position and the start

5.

Lift out the bracket.

 

switch is momentarily placed in the lower posi-

6.

Remove the two #10-32 slotted-head screws hold-

tion. Connect the brewer to the power source.

 

ing the solenoid valve to the mounting bracket.

After the approximate setting on the delay dial,

7.

Securely install the new solenoid valve to the

the indication must be:

 

mounting bracket.

 

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

8.

Attach the mounting bracket to the trunk base.

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

9.

Securely fasten the sweetener and water lines to

c) 100 volts ac for two wire 100 volt models, re-

 

and from the solenoid valves.

 

main for the approximate setting on the dilution

10.

Refer to Fig. 19 when reconnecting the wires.

dial, and then return to its previous indication.

 

 

 

3. Disconnect the brewer from the power supply.

 

 

 

If voltage is present as described, proceed to #4.

 

WHI/VIO to Brew Timer TL1

 

WHI/VIO to Brew Solenoid

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

 

BRN/WHI to

 

 

Selector Switch

 

continuity across the coil terminals. If continuity

 

SWEETENER

 

is present as described, reconnect the brown/white

 

 

 

SOLENOID (OPTIONAL)

 

and white/violet wires and proceed to #5.

 

 

 

If continuity is not present as described, replace the

 

P2843

solenoid valve.

 

FIG.19 SOLENOID VALVE TERMINALS

 

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Image 24
Bunn TU3Q service manual Sweetener Solenoid Valve Optional