Bunn Single SH Guía Del Usuario

Page 15

Location:

The bypass valve is located inside the right  front

of the hood.

Test Procedures:
1. Disconnect  the  brewer  from  the  power  source.

Place a server beneath the brewing funnel.

2. Check the water level in the tank to confirm that it

is within 1/2" from the top of the tank.

3. Connect the brewer to the power source.
4. Check the bypass valve for coil action. Place the

ON/OFF  switch  in  the  "ON"  position,  press  and
release the BREW switch. Listen carefully in the
vicinity of the bypass valve for a "clicking" sound as
the coil magnet attracts and repels the plunger.

5. Disconnect the brewer from the power source.

If  the  sound  is  heard  as  described,  there  may  be  a
blockage in the bypass valve or the water line to the
sprayhead. Remove the bypass valve and inspect for
wear, and remove waterborne particles.
If the sound is not heard as described, proceed to #6.

6. Connect the voltmeter lead ends to the dispense

valve  coil  terminals.  Connect  the  brewer  to  the
power source. With the selector switch in the 1.5
or 1.75 gallon position, place "ON/OFF" Switch in
the  "ON"  position.  Press  and  release  the  brew
switch. The indication must be:

P774

FIG. 2 BYPASS VALVE

FIG.3 BYPASS VALVE TERMINALS

22978.0000

SE

T     

LO

CK

LOCK

SET

P2230

WHI/GRN to Dispence Valve

WHI/VIO to Brew Selector Switch

28230 031201

a.) 120 volts ac for two wire 120 volt models, 208
volts ac for three wire 120/208 volt models and
240 volts ac for three wire 120/240 volt models.
b.) 200 to 240 volts ac for two wire 200 or 240 volt
models.

7. Disconnect the brewer from the power source.

If voltage is present as described, but no coil action is
observed, nor "clicking" heard, bypass valve is defec-
tive. Replace valve and test again to verify repair.
If voltage is not present as described, refer to 

Wiring

Diagrams and check the brewer wiring harness. Also
check  the  control  board  for  proper  operation.  See
Pages 23 through 27.

Removal and Replacement:
1. Remove the wires  from the bypass valve.
2. Drain enough water from the tank so bypass valve

is above the water level.

3. Remove water lines from valve.
4. Remove two nuts retaining bypass valve inside the

hood and remove bypass valve.

5. Remove hose barb fitting and attach to new by-

pass valve.

6. Install new bypass valve with hose barb fitting.
7. Reconnect the water tubes and the wires to the

bypass valve.

8. Refer to Fig. 3 when reconnecting the wires.