Bunn ULTRA-2 manual SERVICE cont LAMP RELAY

SERVICE (cont.)

LAMP RELAY

ULTRA-2 shown

FIG. 51 LAMP RELAY

Location:

The Lamp Relay is located under the upper deck of the chassis, on the right side.

Test Procedures: (Coil)

1.Disconnect the dispenser from the power source.

2.Connect a voltmeter, across BLU/BLK wire (+) and the VIO wire (-).

3.Connect the dispenser from the power source.

4.Turn on Power (I/O) Switch. Verify the dispenser is in the “DAY” mode.

The indication must be:

a)12 volts dc in the “DAY” mode,

b)0 volts dc in the “NIGHT” mode.

If voltage is present as described, the Control Board is operating properly. Replace Relay if it does not energize when voltage is present.

If voltage is not present as described, refer to the Wiring Diagrams and check the main wiring harness.

If harness has continuity, replace the Control Board.

Test Procedures: (Contacts)

1.Disconnect the dispenser from the power source.

2.Disconnect the WHI/VIO and WHI/YEL wires. Con- nect an ohmmeter across the two coil terminals where the wires were just removed.

3.Connect the dispenser from the power source..

4.Turn on Power (I/O) Switch. Verify the dispenser

is in the “DAY” mode. The indication must be:

a)continuity in the “DAY” mode,

b)open in the “NIGHT” mode.

If continuity is present as described, the Relay is op- erating properly.

If continuity is not present as described, replace the Relay.

Not Used (N/C)		4	2
3	1
FIG. 52 LAMP RELAY

	ULTRA-2		ULTRA-1
1.	(-) 12vdc (VIO) from	1.	(-) 12vdc (VIO) from
	Control Board J5-7		Control Board J10-12
2.	(+) 12vdc (BLU/BLK) to	2.	(+) 12vdc (BLU/BLK) to
	Control Board J5-19		Control Board J10-14
3.	12vac (WHI/VIO) to	3.	12vac (WHI/RED) to
	Lamp Connectors		Lamp Connector
4.	12vac (WHI/YEL) from	4.	12vac (RED) from
	Circuit Breaker		Circuit Breaker

53 41084 102709