USER MANUAL - operation
Slim Jim User manual
page 18
Pump-pressure
Check
Check the pump-pressure when an actual brew is at the infusion stage; i.e. the highest pressure
reached during a brew. Make sure that only a single group is active during this check as multiple
“users” will result in a somewhat lower pump-pressure.
Do not use the mix-water during this check as that will also result in some pressure loss.
Check all groups available and compare the results. The pump-pressure at the different groups should
be identical as there is only one pump used for the entire machine.
Notes!
A small divergency (<0.2 bar) between the groups can be the result of deviations between pressure
gauges and is no cause for alarm.
A large divergency may indicate a malfunction but can also be the result of different coffee-bed
preparation. Redo the check and have a technician solve the problem when the divergency persists.
Adjust
Pump pressure is adjusted on the pump by regulating the amount of by-pass of the pump-outflow.
Adjust the pressure when an actual brew is at the infusion stage (the more or less stable high
pressure during a brew).
See Figure 13: First loosen the plastic locking nut, then twist the set-screw until the desired pressure
is reached and fasten the locking nut again. Check the pump pressure again after the adjustment.
Figure 13. Showing the pump with set screw to adjust the pump-pressure.
decrease pressure
increase pressure
set screw
locking nut
