SERVICE (cont.)

LIQUID LEVEL BOARD AND LEVEL PROBE

FIG.12 LIQUID LEVEL BOARD AND

P2209.60

 

LEVEL PROBE

 

Location:

 

The liquid level board is located on the left rear of the component bracket. The level probe is located on the right rear of the component bracket.

Test Procedures:

1.Disconnect the brewer from the power source.

2.Disconnect the blue wire (T1) and the pink wire (T4).

3.Check the voltage across terminals (T2) and (T3) with the ON/OFF switch in the "ON" position. The indication must be:

a)120 volts ac for 120/208 volt, 120/240 volt and

380 volt models.

b)208 volts ac or 240 volts ac for two wire 208 volt or 240 volt models.

d)230 volts ac for two wire 230 volt models.

e)220 volts ac or 440 volts ac for four wire 280 volt or 440 volt machines.

4.Disconnect the brewer from the power source. If voltage is present as described, proceed to #5.

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

5.Reconnect the blue wire to T1 on the liquid level board.

6.Carefully connect a piece of insulated jumper wire to terminal 4. Keep the other end of this wire away from any metal surface of the brewer.

7.Touching the free end of the jumper to the brewer's frame simulates a "FULL" condition, preventing jumper from touching the brewer's frame simulates "NEED WATER" condition. Connect the brewer to the power source, simulate the conditions in the chart below while measuring the voltage between T1 and T3 0n the liquid level board. Repeat these several times. There is an approximate five second delay for output to stabilize.

Model

Voltage -

Voltage -

 

Jumper

Jumper

 

Not Touching

Touching

 

Frame

Frame

120/208V &

120V

0

120/240V - 3

 

 

wire w/ground

 

 

single phase

 

 

230V - 2 wire

230V

0

w/ground

 

 

single phase

 

 

208V or 240V -

208V or

0

2 wire wground

240V

0

single phase

 

 

280V or 440V -

220V or

0

4 wire w/ground

254V

0

3 phase

 

 

380V - 3 wire

120V

0

w/ground 3

 

 

phase w/

 

 

stepdown trans- former

8. Disconnect the brewer from the power source and remove the jumper wire from terminal 4.

If voltage is present as described, liquid level board is operating properly, proceed to #9.

If voltage is not present as described, replace the liquid level board.

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10060

080900

 

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Image 20
Bunn U3A Liquid Level Board and Level Probe, Reconnect the blue wire to T1 on the liquid level board, Model Voltage

U3A, U3 specifications

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