Bunn VLPFCanada Manuale Proprietario

Page 23

SERVICE (cont.)
RELAY

FIG. 16 RELAY

P2172.80

Location:

The relay is located in the right rear corner of the

hood.

Test Procedures

1. Disconnect the brewer from the power source.

2. With a voltmeter, check the voltage across termi-

nals A & B in the lower corners of the relay when

the On/Left switch is in the upper position and

the Start switch is pressed to the lower position

and released. Connect the brewer to the power

source. The indication must be 120 volts ac for

the approximate setting of the brew timer and then

return to zero.

3. Disconnect the brewer from the power source.

If voltage is present as described, proceed to #4.

If voltage is not present as described, refer to the Wir-

ing Diagram and check the brewer wiring harness.

4. Remove the black and white wires from terminals

A & B.

5. Check for continuity across terminals A & B of the

relay.

If continuity is present as described, reconnect the

black and white wires and proceed to #6.

If continuity is not present as described, replace the

relay.

6. Remove the brown/white, white/red, and white/

blue wires from terminals 2, 5 & 7 of the relay.

10179 121704

7. Check for continuity across terminals 2 & 7 when

the On/Left switch is in the upper position only

until the Start switch is pressed to the lower

position and released. Connect the brewer to the

power source. Continuity must return across these

terminals after the approximate setting of the brew

timer.

8. Disconnect the brewer from the power source.

9. Check for continuity across terminals 5 & 7 when

the On/Left switch is in the upper position and the

Start switch is pressed to the lower position and

released. Connect the brewer to the power source.

Continuity must be present across these terminals

for the approximate setting of the brew timer.

10. Unplug the brewer.

If continuity is present as described, reconnect the

wires, the relay is operating properly.

If continuity is not present as described, replace the

relay.

Removal and Replacement:

1. Remove all wires from the relay terminals.

2. Remove the two #8-32 nuts holding the relay

mounting bracket to the hood.

3. Remove the relay from the mounting bracket.

4. Securely install the new relay to the mounting

bracket.

5. Install the relay mounting bracket to the hood.

6. Refer to FIG. 17 when reconnecting the wires.

FIG. 17 RELAY TERMINALS

P1988.70

BLK to Timer (TL3)

BRN/WHI to Liquid

Level Board (J1)

WHI/RED toLiquid Level Board (J2)

WHI/RED to Timer (TL1)

WHI/BLU to

Solenoid

WHI/GRN to Timer (TL4)