Bunn U3 U3A - Manual (Page 22)

Page 22
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
SERVICE (cont.)
ON/OFF SWITCH
FIG.14 ON/OFF SWITCH
P2209.50
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 indica-
tor 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
models.
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 har-
ness.
10060 080900