Bunn TU3 service manual SERVICE cont, Dilution Timer

SERVICE (cont.)			If continuity is present as described, reconnect the
DILUTION TIMER
			wires to terminals TL3, TL4, & TL5 of the timer board
			and proceed to #5.
			If continuity is not present as described, refer to the
			Wiring Diagrams and check the wiring harness.
			5. With a voltmeter, check the voltage across termi-
			nals TL1 and TL4 when the ON/OFF switch is in
			the "ON" position and the start switch is momen-
			tarily placed in the lower position. Connect the
			brewer to the power source. After a delay of ap-
			proximately three minutes, the indication must be:
			a) 120 volts ac for two wire 120 volt models for
			approximately one minute and then return to its
			previous indication.
			b) 240 volts ac for two wire 240 volt models for
			approximately one minute and then return to its
			previous indication.
			c) 100 volts ac for two wire 100 volt models for
		P1276.40	approximately one minute and then return to its
	FIG. 12 DILUTION TIMER		previous indication.
Location:			6. Disconnect the brewer from the power source.
	The dilution timer is located inside the hood on the		If voltage is present as described, the timer is operat-
right side. It consists of the dial plate with two dials
			ing properly. Adjust the timer dials as required.
and circuit board.
			If voltage is not present as described, replace the timer.
Test Procedure:			Removal and Replacement:
1.	Disconnect the brewer from the power source and
			1. Remove all wires from the timer.
	remove the wires from terminals TL3, TL4, & TL5
			2. Remove the circuit board and dial plate from the
	of the timer and rotate both dials fully counter-
			brackets.
	clockwise.
			4. Install the new dial plate and circuit board to the
2. With a voltmeter, check the voltage across termi-
			brackets.
	nals TL1 and TL2 when the ON/OFF switch is in
			5. Refer to Fig. 13 when reconnecting the wires.
	the "ON" position. Connect the brewer to the power
			6. Adjust the timer dials as required.
	source. The indication must be:
	a) 120 volts ac for two wire 120 volt models.
	b) 240 volts ac for two wire 240 volt models.		WHI/BLU to Dilution Solenoid	GRN to Start Switch
	c) 100 volts ac for two wire 100 volt models.		RED/BLK to Start Switch
3.	Disconnect the brewer from the power source.		WHI to Brew Timer (100V &
			120V Models)
If voltage is present as described, proceed to #4.			RED to Brew Timer (240V
			Models)
If voltage is not present as described, refer to the Wir-			WHI/VIO to ON/OFF Switch
ing Diagrams and check the wiring harness.			GRY to Selector Switch	PNK to Selector Switch
4.	Check for continuity across the green and red/		(Half Batch Option Only)	(Half Batch Option Only)
			PNK to Selector Switch	GRY to Selector Switch
	black wires when the start switch is held in the		(Half Batch Option Only)	(Half Batch Option Only)
	lower position.		FIG. 13 DILUTION TIMER TERMINALS		P1281
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