FIG.14 ON/OFF SWITCH

SERVICE (cont.)

ON/OFF SWITCH

P2209.60

Location:

The ON/OFF switch is located on the left side of the switch mounting bracket. The switch mounting bracket is mounted on the front of the component bracket.

Test Procedures:

1.Disconnect the brewer from the power source.

2.a)120/208V, 120/240V, 208V and 240V Models Remove the black wire on the ON/OFF switch from the fuse holder or circuit breaker and the red wire on the power indicator light.

b)380V and 440V Models - Remove the black wire on the ON/OFF switch from the fuse holder or circuit breaker and the white wire from the power indicator light.

c) 230V - CE Models - Remove the red wire on the ON/OFF switch from the fuse holder and the black

wire on the power indicator light.

3.Connect the brewer to the power source. With a voltmeter, check the voltage across the removed wires. The indication must be:

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

380 volt models.

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

c)240 volts ac for two wire 240 volt models prior to #U300004095 and three wire 240 volt models.

d)230 volts ac for two wire 230 volt models #U300004095 and up).

e)208 or 240 volts ac for four wire 440 volt mod- els.

4.Disconnect the brewer from the power source.

If voltage is present as described, reconnect the wires and proceed to #5

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

5.Disconnect the wires on the ON/OFF switch.

6.a) 120/208V, 120/240V, 208V, 240V, 380V and 440V Models - Check for continuity across the terminals on the rear of the switch with the switch in the "ON" (upper) position. Continuity must not be present when the switch is in the "OFF" (lower) position.

b) 230V - CE Models - Check for continuity across the center terminal (2) and the lower terminal (1) when the switch is in the "ON" (upper) position. Continuity must not present when the switch is in "OFF" (lower) position.

If continuity is present as described, the switch is operating properly.

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

Removal and Replacement:

1.Remove the wires from the switch terminals.

2.Compress the clips on the back side of the switch mounting bracket and gently push the through the opening.

3.Push the new switch into the opening and spread the clips to hold switch in the mounting bracket.

NOTE: ON 230V - CE models terminal (3) must be on the top.

4.Refer to Fig. 15 and reconnect the wires. BLK from Main Harness

BLK to Start Switch, Brew

Timer & Liuqid Level Board

L2

120/208V, 120/240V, 208V, 240V, 380V AND 440V

MODELS

BLK from Main Harness

RED to Main Harness

RED to Start Switch, Brew Timer & Liquid Level Board

230V - CE Models

FIG. 15 ON/OFF SWITCH TERMINALS

P1735

 

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10060

080900

 

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Image 22
Bunn U3A service manual ON/OFF Switch, Test Procedures Disconnect the brewer from the power source

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