- 31 -
fi g. 25 - Hydraulic unit automatic bleeder valve
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Volume of the heating system
You must maintain the minimum installation water
volume. Install a buff er tank on the return from the
heating circuit in case the volume is lower than this
value. Where the system is fi tted with one or more
thermostatic valves, you must ensure that this minimum
water volume is able to circulate.
Min. volume in litres PER CIRCUIT (excl. HP)
Appliance
Mandatory
Fan-coil
Recommendation
Radiators
Recommendation
Heating-cooling fl oor
Excellia A.I. 11
Excellia A.I. tri 11
55 50 25
Excellia A.I. 14
Excellia A.I. tri 14
74 66 35
Excellia A.I. tri 16 87 80 44
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Filling and bleeding the installation
Check the pipe fi xings, tightness of the connectors and
the stability of the hydraulic unit.
Check the direction in which the water is circulating and
that all the valves are open.
Proceed to fi ll the installation.
Do not operate the circulation pump during fi lling. Open
all the drain valves in the installation and the bleeder
valve on the hydraulic unit to expel the air contained in
the pipes.
Close the drain valves and add water until the pressure
in the hydraulic circuit reaches 1 bar.
Check that the hydraulic circuit has been bled correctly.
Check there are no leaks.
After the "Commissioning" stage (see
page 44), and
once the machine has started, bleed the hydraulic unit
again.
Precise fi lling pressure is determined by the
water pressure in the installation.
P
alfea excellia A.I. / Installation / 1876 - EN