Bunn TWF service manual SERVICE cont, Dilution Solenoid Valve

SERVICE (cont.)		5.	Check the solenoid valve for coil action. Connect
DILUTION SOLENOID VALVE			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.
	P2198.50	Removal and Replacement:
	FIG. 16 DILUTION SOLENOID VALVE	1.	Remove all wires from the solenoid valves.
		2.	Turn off the water supply to the brewer.
Location:		3.	Disconnect the water lines to and from the sole-
	Viewing the brewer from the rear the dilution so-		noid valves.
lenoid is mounted on the right side of the solenoid		4.	Remove the two #8-32 keps nuts holding the
mounting bracket which is secured to the trunk base.		5.	mounting bracket to the trunk base.
			Lift out the bracket.
Test Procedure:		6.	Remove the two #10-32 slotted-head screws hold-
1. Disconnect the brewer from the power source.			ing the solenoid valve to the mounting bracket.
2.	With a voltmeter, check the voltage across the	7.	Securely install the new solenoid valve to the
	white/blue and white/violet wires on the dilution		mounting bracket.
	solenoid terminals when the TEA/OFF/COFFEE	8.	Attach the mounting bracket to the trunk base.
	switch is in the “TEA” position and the START	9.	Securely fasten the water lines to and from the
	switch is momentarily placed in the lower posi-		solenoid valves.
	tion. Connect the brewer to the power source.	10.	Refer to Fig. 17 when reconnecting the wires.
	The indication must be 120 volts ac for two wire
	120 volt models and three wire 120/208 volt mod-
	els.		WHI/BLU to Iced
3. Disconnect the brewer from the power supply.
			Tea Brew Timer
			TL4

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.

		WHI/VIO to Iced
4. Remove both wires from the coil and check for	HOT COFFEE	Tea Brew Timer
		TL1
continuity across the coil terminals.	BREW SOLENOID
	ICED TEA BREW
	SOLENOID
If continuity is present as described, reconnect the		DILUTION
white/blue and white/violet wires and proceed to #5.
		SOLENOID
If continuity is not present as described, replace the		P1364
solenoid valve.	FIG.17 SOLENOID VALVE TERMINALS
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