Bunn ULTRA-1 manual SERVICE cont RELAY or CONTACTOR on Early Models

FIG. 32 RELAY

SERVICE (cont.)

RELAY (or CONTACTOR on Early Models)

ULTRA-2 shown

Location:

The relay (or contactor) is located inside the dis- penser chassis on the lower outside of the component

If continuity is present as described, disconnect the dispenser from power source and reconnect wires to terminals #6 and #8, the relay is working.

If continuity is not present as described, do the same continuity test across terminals #2 and #4. If continu- ity is present between terminals #2 and #4, reconnecr wires to terminals #2 and #4 instead of #6 and #8.

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

Removal and Replacement:

1.Disconnect the wires from the relay.

2.Remove the two #8-32 locking screws securing the relay to the chassis. Remove and discard relay.

3.Install the new relay on the chassis using two #8-32 locking screws.

4.Refer to Fig. 33 and 34 to reconnect the wires.

Early Model ULTRA-2

bracket.

Test Procedures:

1.	Disconnect the dispenser from the power source.
2.	Remove the right side panel.
3.	Connect the dispenser to the power source.
4.	Turn on power (I/O) switch. Verify UPPER case
	“ICE” or “CHILL” mode.
5.	With a voltmeter, check the voltage across the white

Terminal #4

Terminal #2

Terminal #6

BLK from Main

Harness/Power Cord

Terminal #8

WHI/ORN from

Compressor Harness

Terminal #0

WHI from Main Harness

Terminal #1

ORN from

Control Board

wire and the orange wire.

The indication must be:

a) 120 volts ac for 120 volt models.

b) 230 volts ac for 230 volt models.

6. Disconnect the dispenser from the power source.

If voltage is present as described, proceed to #7.

If voltage is not present as described, refer to the Wir- ing Diagram and check the dispenser wiring harness. If harness has continuity, replace Control Board.

7.Disconnect the black wire and the WHI/ORN wires from relay terminals #6 and #8.

8.Connect the dispenser to the power source.

9.Turn on power (I/O) switch. Verify UPPER case “ICE” or “CHILL” and check for continuity across terminals on relay.

	P1333
FIG. 33 CONTACTOR TERMINALS

Late Model ULTRA-2 & ULTRA-1
Terminal #0	Terminal #1
WHI from	ORN from
Main Harness	Main Harness
	Terminal #8
	BLK from
	Main Harness
Terminal #2	Terminal #6
Terminal #4	WHI/ORN from
	Main Harness
FIG. 34 RELAY TERMINALS
39	41084 102709