Bunn TU3Q service manual Sweetener Solenoid Valve Optional

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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