Bunn System III manual SERVICE cont, Brew Selector Switch

SERVICE (cont.)

BREW SELECTOR SWITCH

FIG. 4 BREW SELECTOR SWITCH P1097.40

Location:

The brew selector switch is located in the front of the hood on the lower right side on DBC models and to the right of center on electro/mechanical models.

Test Procedure:

Timer or DBC

1.Disconnect the brewer from the power supply.

2.Separate the connector on the selector switch harness from the brew timer circuit board or DBC connector.

3.Check for continuity across the pink and tan wires on the connector when the switch is in the 1 gallon position. Continuity must not be present in any other position.

4.Check for continuity across the pink wire and the gray wire when the switch is in the 1-1/2 gallon position. Continuity must not be present in any other switch position.

5.Reattach the connector to the brew timer circuit board or DBC connector.

Grinder Interface:

6.Disconnect pink, gray and tan wires on the selector switch from the pink, gray and tan wires on the interface socket.

7.Check for continuity across the pink wire and the tan wire on the selector switch when the switch is in the 1 gallon position. Continuity must not be present in any other position.

8.Check for continuity across the pink wire and gray wire on the selector switch when the switch is in the 1-1/2 gallon position. Continuity must not be present in any other position.

9.Reconnect the pink, gray and tan wires on the selector switch to the pink, gray and tan wires on the interface socket.

Bypass Valve:

10.Disconnect the white/violet wire on the selector switch from the bypass valve coil and disconnect the white/red wire from the dispense valve coil.

11.Check for continuity across the white/violet wire and white/red wire when the selector is in the 1-1/ 2 gallon and 2 gallon position. Continuity must not be present in any other position.

12.Reconnect the white/violet wire to the bypass valve coil and the white/red wire to the dispense valve coil.

If continuity is as described the switch is operating properly.

If continuity is not present as described replace switch assembly.

Removal and Replacement:

1.Disconnect the connector on the selector switch harness from the brewer timer circuit board.

2.Disconnect wires from the selector switch, inter- face socket, dispense valve and bypass valve.

3.Loosen the set screw on the switch knob.

4.Remove the 9/16" nut and washer holding the switch to the hood.

5.Remove the switch.

6.Install the new switch. The positioning tab must be in the hole in the hood for proper switch and knob alignment.

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