Bunn Dual SH BrewWISE, Technical Training Manual

Bunn-O-Matic Corporation

19

Preventive Maintenance

In order to maintain proper operation and long service life BUNN recommends performing the preventive mainte-
nance every 6 months. Individual customers will vary with some customers choosing not to receive preventive main-
tenance.

Tools Required:

2 Flat blade screwdrivers (1 small tip, 1 medium tip)

• 

Phillips screwdriver

• 

2 adjustable wrenches

• 

Channel lock pliers

• 

Needle nose pliers

• 

Basin wrench Bunn PN: 01060.0000

• 

Deliming tool Bunn PN: 38227.0000

• 

Prior to servicing the brewer:

Disconnect the electrical supply

• 

Shut off the water supply

• 

Drain the water tank

• 

Remove the front panel

• 

Remove the top panel

• 

PM Steps

Step 1: Disassemble and clean the strainer assembly

Using an adjustable wrench, loosen the 

fl

are nuts on the top and bottom of the  

□

 strainer 

assembly

Using two adjustable wrenches, disassemble the strainer 

□

Rinse and scrub the 

fi

ne mesh screen to remove any mineral build-up

□

Reassembly is the opposite of disassembly

□

Step 2: Rebuild the 

fi

ll solenoid- Skinner Valve (Note do not remove the valve from the machine)

Using the basin wrench, remove the nut from the front of the valve

□

Disconnect the electrical leads from the valve coil

□

Remove the coil from the valve stem 

□

Using the basin wrench, unscrew the valve stem from the base

□

Replace the valve plunger and spring using the rebuild kit Bunn P/N: 01111.0000

□

Reassembly is the opposite of disassembly

□

Step 3: Remove and clean the 

fi

ll tube

Using an adjustable wrench remove the tube 

fi

tting from the 

fi

ll tube on top of the tank

□

Gently pull the 

fi

ll tube out of the top of the tank

□

Wipe any mineral deposits from the exterior of the tube

□

Clean any mineral deposits from the bottom of the tube

□

Clean any obstructions from the interior of the tube

□

Reinstallation is the opposite of removal

□

Step 4: Rebuild the by-pass solenoids

Remove the hose clamps that secure the tubing to the valve

□

Remove the two nuts that hold the solenoid bracket to the machine

□

Gently remove the tubing from the valve body

□

Using a 

fl

at blade screwdriver, remove the four screws and separate the valve assembly

□

Replace plunger, spring, and rubber seat using the rebuild kit Bunn P/N: 11517.0008

□

Clean any mineral build-up from the valve

□

Reassembly is the opposite of disassembly

□