FILLING AND DRAINING
Multidea Evo appliances are NOT fitted with a filler valve,
and therefore a suitable filling system must be envisaged
during installation at the most convenient point for the
installer.
As a guideline, the figure illustrates a possible system
filling unit connection point (CI).
NOTE:
The appliance is equipped with an automatic valve for
purging the air from the system.
Before starting system filling or draining operations, set
the main system switch (IG) to “OFF”.
BOILER - SYSTEM FILLING
- In the case of cascade installations, ensure that the
check valve supplied is inserted correctly in the system
return connector (RI)
- Remove the front panel of the boiler
- Open the automatic purge valve (3) in the boiler and
those envisaged at the highest point of the boiler
- Ensure that the boiler drain valve (15) is closed
- Ensure that the pre-charge pressure of the expansion
vessel(s) is correct
- Open the system filling valve (CI) and slowly charge
until the pressure gauge (21) indicates a value, in cool
conditions,ofapprox.2bar
- Close the system filling valve (CI).
N.B. Small deviations from readings between the
pressure shown on the electronic display and that
on the pressure gauge (21) on board the boiler are
considered normal.
BOILER DRAINING
- Ensure that the system supply and return shut-off valves
are closed
- Connect a rubber hose to the boiler drain valve (15) and
then open the valve
- On completion of draining, close the drain valve (15).
- Close the automatic purge valve (3) on the boiler.
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