Bunn Brewer STF-20

Use of a damp cloth rinsed in any mild, non-abrasive, liquid detergent for cleaning all surfaces on Bunn-O-Matic equipment

Check and clean the sprayhead. The sprayhead holes must always remain open

With the sprayhead removed, insert the deliming spring (provided) all the way into the sprayhead tube. When inserted properly, no more than two inches of spring should be visible. Saw back and forth five or six times

NOTE - In hard water areas, this may need to be done daily. It will help prevent liming problems in the brewer and takes less than a minute

Sign off on the daily brewer cleaning

NOTE: Do not remove or install wires while timer board is installed. Pressure applied to one side may cause damage to the board

Disconnect the brewer from the power source and remove the front panel

Voltage across terminals TL1 and TL2 when the 'ON/OFF' switch is in the 'ON' position

Voltage is present as described

If voltage is not present as described, check the brewer wiring harness

Voltage across terminals TL1 and TL4 when the 'ON/OFF' switch is in the 'ON' position

Voltage indication is zero volts

If voltage is not as described, disconnect the brewer from the power source and replace the timer

Disconnect the brewer from the power source

Remove the blue wire from terminal 1 and the pink wire from terminal 4 of the circuit board

Voltage across terminals 2 and 3

Connect the brewer to the power source and turn the ON/OFF switch to the ON position

Disconnect the brewer from the power source

Reconnect the blue wire to terminal 1

Connect a piece of insulated jumper wire to terminal 4

Remove the three #4-40 screws securing the warmer assembly to the brewer

Lift the warmer assembly from the brewer

Disconnect the two wires from the warmer element terminals

Remove the two #8-32 nuts securing the warmer element to the warmer plate

Securely install new warmer element

Reconnect the two wires to warmer element terminals

Securely install warmer assembly on the brewer

Sign off on the Brewer Warmer Elements Replacement

Remove the wires from the switch terminals

Compress the clips inside the switch panel and gently push the switch through the opening

Push the new switch into the opening and spread the clips to hold switch in the switch panel

Sign off on the switch replacement