6
EN
B CLASSIC / B FUTURA / S CLASSIC - TECHNICAL MANUAL
FUNCTIONING
1.4 1st PRESSURE RISE
During this phase, steam injection into the chamber is activated to raise pressure back up to 1.00 bar from the negative
value reached during the vacuum pulse.
Pressure is raised in two steps; rstly, from – 0.80 bar to 0.00 bar, and then from 0.00 bar to 1.00 bar.
During the rst pressure rise step, solenoid valve EV2 is activated to compensate for any air pockets which may have
developed in the hydraulic circuit outside the chamber.
The tube bundle heating element of the chamber and the generator heating element remain activated throughout the
pressure rise phase to ensure that the proper temperature is maintained in the chamber and enable fast steam genera-
tion.
1
st
PRESSURE RISE - components on state
STATE
EV1
Drain
High (NO)
EV2
Air inlet
(NC)
EV3
Drain Low
(NC)
EV4
Drain
bypass
(3V)
EV5
Air inlet to
chamber
(NC)
FAN
WATER
PUMP
VACUUM
PUMP
CHAMBER
BUNDLE HTR
GENERATOR
HTNG ELMT
Step 1
from
- 0.80 to
0.00
Off
open
On
open
Off
closed
On (1)
Off
closed
ON ON OFF ON ON
Step 2
from 0.00
to 1.00
Off
open
Off
closed
Off
closed
Off (2)
Off
closed
ON ON OFF ON ON
After the 1
st
PRESSURE RISE is completed properly, the sterilization cycle continues as pressure is lowered again to
the same negative value as during the 1
st
VACUUM PHASE during two additional VACUUM PHASES, which are sepa-
rated by a second PRESSURE RISE up to 1.00 bar.
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