Bunn U3 Operating & Service Manual page 21

Bunn u3, u3a operating & service manual
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SERVICE (cont.)
LIQUID LEVEL BOARD AND LEVEL PROBE (cont.)
9. Reconnect the pink wire to terminal 4.
10. Remove the two #8-32 screws securing the level
probe to the component bracket.
11. Gently pull the probe out of the component bracket
and inspect for corrosion. Replace if necessary.
12 Place the probe so that neither end is in contact
with any metal surface of the brewer.
13. Connect the brewer to the power source. Check
the voltage across terminals 1 and 3, refer to
chart below. There is an approximate delay of five
seconds for output to stabilize.
Voltage -
Model
Jumper
Not Touching
Frame
120/208V &
120V
120/240V - 3
wire w/ground
single phase
230V
230V - 2 wire
w/ground
single phase
208V or
208V or 240V -
2 wire wground
240V
single phase
220V or
280V or 440V -
4 wire w/ground
254V
3 phase
380V - 3 wire
120V
w/ground 3
phase w/
stepdown trans-
former
14. Disconnect the brewer from the power source.
If voltage is present as described, reinstall the level
probe, the liquid level board and level probe are op-
erating properly.
If voltage is not present as described, check the
pink wire on the level probe from liquid level board
terminal 4.
Removal and Replacement:
1. Remove all wires from the liquid level board.
2. Remove the #10-32 screw and flat washer securing
the protective shield to the component bracket.
3. Remove the #10-32 screw and internal tooth
Voltage -
lockwasher securing the liquid level board to the
Jumper
component bracket.
Touching
4. Remove liquid level board and discard.
Frame
5. Install new liquid level board on component bracket
and secure with a #10-32 screw and internal tooth
0
lockwasher.
6. Install protective shield and secure with #10-32
screw and flat washer.
7. Refer to Fig. 13 and reconnect the wires.
0
0
0
0
0
0
FIG.13 LIQUID LEVEL BOARD TERMINALS
Page 21
T1 BLU to Solenoid Valve
T2 BLK to ON/OFF Switch (All models
except 230V-CE models)
T3 WHI to Main Harness
(120/208V, 120/240V,
four wire 380V and 440V
models)
T3 WHI to Transformer
(380V three wire models)
T3 RED to Main Harness
(208V, 240V single phase
and three phase models)
T3 BLK to Main Harness
(230V two wire models)
T4 PIN to Level Probe
P1733
10060 080900

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