Bunn System III manual SERVICE cont OVERFLOW PROTECTION SWITCH

SERVICE (cont.)

OVERFLOW PROTECTION SWITCH

			1
	3TL	2	LT
		TL
5	4L
TL	T
			P2231.35
FIG. 21 OVERFLOW PROTECTION SWITCH

Location:

The overflow protection switch is located inside the hood on the tank inside the copper overflow cup.

To test the overflow protection switch, access will also be needed to the level control board or DBC board assembly and terminal block.

Test Procedure:

1.Disconnect the brewer from the power source.

2.Remove the wire nuts connecting the red wires from the overflow protection switch to the black wire from the terminal block or DBC board assem- bly, and blue wire from the thermostat or the red wire from the DBC board assembly.

3.Check for continuity across the overflow protec- tion switch red wires only until the plastic float is raised and check that continuity returns when the plastic float is again lowered.

If continuity is present as described, reconnect the red wires to the black wire from the terminal block or DBC Board Assembly, and the blue wire from the thermo- stat or red wire from DBC board assembly.

If continuity is not present as described, replace the overflow protection switch.

Removal and Replacement:

1.Disconnect the red leads from the overflow pro- tection switch from the black wire from the termi- nal block or DBC board assembly and the blue wire from the thermostat or red wire from DBC board assembly.

2.Remove the nut beneath the copper overflow cup.

3.Remove the entire switch assembly from the cup.

4.Place the new switch assembly into the cup, wires

first. Make sure that a gasket is in place around the threaded switch stem.

NOTE - The magnets must be at the top of float and there must be NO adjusting washers installed for the overflow protection switch to operate prop- erly.

5.Install the nut beneath the copper overflow cup. Be sure not to overtighten.

6.Refer to Fig. 22 when reconnecting wires.

RED to BLK Wire from		RED to BLU Lead from Ther-
Terminal Block (Electro/		mostat (Electro/Mechani-
Mechanical)		cal)
RED to BLK Wire from		RED to RED Wire from DBC
DBC Board J3-12		Board J3-11
	FIG. 22 OVERFLOW PROTECTION		P1103
	SWITCH TERMINALS

Page 29 27362 092996