Bunn RL00006929 service manual Service Water Level and Overflow Safety Switch

SERVICE (cont.)

Water Level and Overflow Safety Switch

FIG. 25 WATER LEVEL and OVERFLOW P1478

SAFETY SWITCHES

Location:

The water level and overflow safety switches are lo- cated under the top cover or top warmer housing and inside and front of the tank fill basin, FIG. 25.

Test Procedure:

1.	Disconnect the brewer from the power source.
2.	Remove the top cover or top warmer housing.
3.	Remove the leads of the switch being tested from
	the connection block mounted on the front of the

If continuity is present as described, reconnect the wires as shown in FIG. 30, the switches are operating properly.

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

Removal and Replacement:

1.Disconnect the brewer from the power source.

2.Remove the top cover or top warmer housing.

3.Remove the wire leads connecting the water level and overflow switches to the terminal block at the front of the tank and fill basin.

4.Disconnect the #8-32 screw and remove the entire switch assembly from the tank and fill basin.

5.Place the new switch assembly into the bracket,

wires up.

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

6.Install the nuts over the wires and secure the switch to the mounting bracket. Do not over tighten.

7.Attach the entire switch assembly to the tank and fill basin using the #8-32 screw.

8.Add or remove washers to the float on the level switch as required. Adding washers increases the volume, removing washers decreases it.

9.Refer to FIG. 26 and the relative wiring diagram when reconnecting wires.

tank basin.

4. Check the voltage across each black lead of the

connection block and the white or red lead on

the solenoid coil with a voltmeter. Turn the ON/

OFF switch to the “ON” position and connect the

brewer to the power source. The indication must

be:

a) 120 volts ac for two wire 120 volt models and

three wire 120/240 volt models,

b) 200 or 240 volts ac for two wire 200 volt or

240 volt models,

c) 100 volts ac for two wire 100 volt models.

5. Disconnect the brewer from the power source.

If voltage is present as described, proceed to #6.

If voltage is not present as described, refer to the Wir- ing Diagrams and check the brewer wiring harness.

6.Check for continuity across the overflow switch pink wires only until the plastic float is raised and check that continuity returns when the float is lowered again.

7.Check for continuity across the water level switch pink wires only until the plastic float is raised and check that continuity returns when the float is lowered again.

to BLK on Start Switch

to BLK on Brew Station Warmer Switch

FIG. 26 WATER LEVEL and OVERFLOW

SAFETY SWITCH WIRING

P1478

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