Expobar BREWTUS IV - 6. Brew Pressure Adjustments; Rotary Pump Pressure Adjustment Procedure

10
5.
Brew Pressure Adjustments
Rotary Pump
CAUTION: Adj
usting the
pump pressure can be
time consuming and since it is very
close to the electrical connection on the boiler
,
we recommend that all adjustment are
done when the machine is not plugged in.
Note: We recommend that the Rotary pump be set to 9
Bar
s
with the back
flush disc
in place
. T
he OPV should be set to open at 11
Bar
s
.
Adjust
ing
the Pump P
ressure:
Adjust the pump pressure by loosening the lock nut then
turning the adjustment screw. Turn the adjustment screw clockwise to raise the pressure
and counter clockw
ise to lower the pressure.
Set
ting
the Brew Pressure:
Turn the adjustment screw counter clockwise to lower the
pressure and clockwise to raise it. Betw
een adjustments
,
lower the lever on the brew
group to release the pressure. Make your adjustment with the machine unplugged and
then plug it in and test your setting. When you have the pressure adjusted
, tighten the
lock whi
le holding the adjustment screw
in place or it may turn and change the setting.
Set
ting
the OPV:
We set this before your machine has shipped. To set the OPV
,
you
will have to run the machine with the backflush disc in place. First
, raise the brew
pressure to 11 Bars
. Then
,
with the pump running
,
turn the
adjustment screw on the OPV
so that it just starts to
let water flow out of the over
flow
tube. It is now set to open at 11
Bars
.
View of Rotary Pump