28
ADJUSTMENTS -
continued
GRINDER PARTICLE SIZE ADJUSTMENT
:
Style
: Adjustment Knob
The particle size of the ground coffee can be adjusted for optimal brewing
of the espresso.
NOTE:
BUNN recommends to rotate knob in 1 click increments to achieve
desired coarseness.
1. Turn knob counterclockwise to increase the particle size (coarse) of the
ground coffee (see Figure 1.)
2. Turn the knob clockwise to decrease the particle size (fine) of the
ground coffee. CAUTION! If there is ground coffee in the grinder, this
adjustment should only be made while the grinder is running. Use
STRENGTH ADJUST, TEST SM or LG GRIND functions to operate the
grinder for making particle size adjustment.
Style
: Grinder Adjustment Screw with Locking Nut
The particle size of the ground coffee can be adjusted for optimal brewing
of the espresso.
The lock nut replaces the grinder knob to prevent tampering of grind
adjustment.
NOTE:
BUNN recommends to rotate adjustment screw in 1 hashmark
increments to achieve desired coarseness.
1. The grinder adjustment screw will be set from the factory to an ap-
proximate particle size setting for espresso (11 Hashmarks).
2. Loosen locknut and use large flat blade screwdriver to rotate adjust-
ment screw clockwise or counter clockwise to desired particle size, use
screwdriver to hold adjustment screw while tightening lock nut. CAU-
TION! If there is ground coffee in the grinder, this adjustment should
only be made while the grinder is running. Use STRENGTH ADJUST,
TEST SM or LG GRIND functions to operate the grinder for making
particle size adjustment.
Procedure Setting Grinder Adjustment Screw Back to Factory Setting
The procedure for setting the adjustment screw back to a factory setting after dismantling and cleaning the burrs.
1. Bean hopper removed or chute closed. Place switch in Program position. Go to display screen and scroll to
“Strength Adjust” menu. Enter and scroll to “Test LG Grind Time” menu. Loosen locknut and use large flat blade
screwdriver to rotate adjustment screw. Press the espresso button to start the grinder motor, while the motor is run-
ning, slowly rotate the adjustment screw inside the nut clockwise. When a “chirping” sound of the burrs touching is
heard, rotate counter clockwise just until the chirping stops.
2. Reference the adjustment screw slot and mark the burr rotor cap with 0. Then rotate the adjustment screw 11 hash-
marks
counter clockwise from 0 to set back to a factory setting. Mark the burr rotor cap to indicate 11 hashmark
setting. Holding the screw with the screwdriver, tighten the hex nut. Make sure after tightening nut, the setting is still
lined up at the 11 hashmarks from zero.
Figure 1
Figure 2
042319
