USER MANUAL
– check condition
Slim Jim User manual
page 25
Check machine condition, report malfunctions
It will help the maintenance technician solving problems if some information about the machine is
known before he makes a house-call. This information should include:
1. serial number of the machine
2. free flow rate of each individual group
3. a well-defined description of the malfunction
Free-flowrate
During “free-flow” (no filter holder locked in the group) the flowrate gives an indication of the smallest
orifice in the coffee system of the machine. This would normally be the the flat-jet underneath the
group-valve which, depending on individual set-up, has a diameter of 0.6
– 1.0 mm. With such small
openings, even a minor divergence can cause quite a large difference in flowrate. Production
variances of the flat-jets are known to cause a difference in free-flow flowrate and thus
“free-flow shot
time” between groups of up to 10%.
The table below gives an indication of free-flowrates at brew temperature with different flat-jet sizes. If
one or more groups have a free-flowrate that falls outside the range given for that flat-jet it is advised
to have a technician check the machine.
diameter of flat-jet
(mm)
minimum
(ml/minute)
goal
(ml/minute)
maximum
(ml/minute)
0.6
400
480
500
0.8
630
750
780
1.0
800
960
1000
Table 2. Showing range of free-flowrates for water of 90-95°C at 9 bar brew pressure for different size
flat-jets.
Heating element indicator lights
A set of indicator lights is found on the bottom of the electronics box, see Figure 19.
If the machine is warmed up and functioning correctly, the 3 lights on the left (steam boiler) will light up
simultaneously at longer intervals and
“in sync”
2
with the corresponding orange indicator line shown
on the interface. The 2 or 3 lights on the right (coffee boiler heating) will light up shortly at somewhat
erratic intervals but in sync with the corresponding orange indicator line on the interface.
If there is a problem with the machine, the indicator lights help to determine possible causes.
Figure 19. The heating element indicator lights on a Slim Jim Triplette, left indicator lights for the
steam boiler, right for the coffee boilers.
2
The interface is lagging by about 0.5 seconds.
coffee
steam
gr1
gr2
gr3
lower
middle
upper
electrics tray
GROUP 1
93.4
GROUP 2
45.6
GROUP 3
93.2
STEAM
124.6
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