Bunn TWF service manual SERVICE cont, Brew Solenoid Valve Hot Coffee, solenoid valve

SERVICE (cont.)	If continuity is not present as described, replace the
BREW SOLENOID VALVE (HOT COFFEE)	solenoid valve.

		6.	Check the hot coffee solenoid valve for coil ac-
			tion. Connect the brewer to the power source. With
			TEA/OFF/COFFEE switch in the "COFFEE" position
			press the START switch and listen carefully in the
			vicinity of the solenoid valve for a "clicking" sound
			as the coil magnet attracts.
		7.	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 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. 2 HOT COFFEE BREW SOLENOID VALVE	1.	Remove all wires from solenoid valves.
Location:		2.	Turn off the water supply to the brewer.
	Viewing the brewer from the, rear the hot coffee	3.	Disconnect the water lines to and from the sole-
brew solenoid valve is mounted on the left side of the			noid valves.
mounting bracket.		4.	Remove the two #8-32 keps nuts holding the
			mounting bracket to the brewer base.
Test Procedures:		5.	Lift out the bracket.
1. Disconnect the brewer from the power source.		6.	Remove the two #10-32 slotted-head screws hold-
2. Disconnect the white/red and white/green wires			ing the hot coffee solenoid valve to the mounting
	from the hot coffee solenoid valve. With the TEA/		bracket.
	OFF/COFFEE switch in the "COFFEE" position press	7.	Securely install the new hot coffee solenoid valve
	the START switch.		to the mounting bracket.
3.	With a voltmeter, check the voltage across the	8.	Attach the mounting bracket to the brewer base.
	white/red and white/green wires. Connect the	9.	Securely fasten the water lines to and from the
	brewer to the power source. The indication must		solenoid valves.
	be 120 volts ac for two wire 120 volt models and	10.	Refer to Fig. 3 when reconnecting the wires.
	three wire 120/208 volt models.		WHI/GRN to Hot Coffee Timer TL4
4.	Disconnect the brewer from the power source.		WHI/RED to Hot Coffee Timer TL1

If voltage is present as described, proceed to #5

If voltage is not present as described, refer to Wiring

Diagrams and check brewer wiring harness.

5. Check for continuity across the hot coffee sole-	HOT COFFEE
noid valve coil terminals.	BREW SOLENOID
	ICED TEA BREW
If continuity is present as described, reconnect the	SOLENOID
		DILUTION
white/red and white/green wires from the hot coffee
		SOLENOID	P1364
brew timer.	FIG.3 SOLENOID VALVE TERMINALS
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