Italtecnica Brio Tank Manuel D'instructions page 19

12.B REPLACEMENT OF VESSEL DIAPHRAGM
If a frequent drop in the pre-set pressure within the pressure vessel is
observed, the internal diaphragm may have become perforated and would
need to be replaced.
This operation must only be carried out by specialized operators,
specifically approved by the manufacturer.
CAUTION: PRIOR TO REPLACING THE VESSEL DIAPHRAGM
PLEASE MAKE SURE THAT:
- THE POWER SUPPLY HAS BEEN DISCONNECTED
-THE PRESSURE WITHIN THE SYSTEM HAS BEEN COMPLETELY
RELIEVED
-THE PRESSURE WITHIN THE PRESSURE VESSEL HAS BEEN
COMPLETELY RELIEVED
CAUTION: It is advisable to fit a shut-off valve on the system to avoid
unnecessary flooding during this operation
The pressure tank and internal diaphragm can be removed by unscrewing the
8 rear screws and lifting the two parts together.
Remove the diaphragm and replace it with a new one.
Place the tank containing the new diaphragm, onto the main body of the Brio
Tank and tighten the 8 screws in alternating order (tighten the screws
gradually in a diametrically-opposed order).
The torque wrench setting of the screws must be between 3.0 and 4.0 Nm.
Since the main body is made of plastic, a maximum of 5 dismantling
operations are allowed. If this limit is exceeded, it may be necessary to
replace the entire device, to prevent the risk of hydraulic failure.
Following the diaphragm replacement procedure, it is important to restore the
pre-set pressure to its former value.
12.C LONG PERIODS OF INACTIVITY
During extended periods of inactivity, particularly during the winter season, the
device should be completely drained of water, in order to prevent it from being
damaged. Before starting the device again, it is advisable to re-check the pre-
charge pressure.
.