Andreja Premium Espresso Machine
14
Maintenance – Continued
Setting Pump (Brew) Pressure
To set the pump pressure, install the backflush
disc into your portafilter and then lock it into the
group head.
Remove the top cup warming tray to expose the
expansion valve adjustment screw shown on the
picture to the right.
Raise the brew lever and then wait a few seconds
for the pressure to rise. After the pressure has
risen, use a flat blade screwdriver to turn the
expansion valve adjustment screw. Turning clockwise will increase the pressure,
counter clockwise to decrease the pressure.
The recommended setting with the backflush disc is 9.5 - 10bar. When you make
espresso the pressure will be slightly less. If the machine puts out 9.5 - 10 bar of
pressure with the backflush disc, but then when you make coffee the pressure is less
than 8 bar then the machine is fine, it‟s the grind that needs to be adjusted finer.
Setting Pump Pressure On Older Models
The older machines have a different style expansion valve which
requires removing the outer shell. The old style expansion valve
will be located in one of the two places shown to the right with
one of them being installed upside down as shown.
To set the pump pressure turn the adjustment
nut shown in the picture to the left.
Turning clockwise will increase the pressure,
counter clockwise to decrease.
Be sure the attached silicone line does not get
twisted or this can cause the pressure to rise.
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