- 33 -
▼
Volume of the heating system
You must maintain the minimum installation water
volume. If the required water volume is not available
in the heating system a buff er tank must be installed
on the return pipework of the heating circuit. Where the
system is fi tted with one or more thermostatic valves,
you must ensure that this minimum water volume is
able to circulate.
Theoretical min. volume in litres PER CIRCUIT (excl. HP)
Model
Mandatory
Fan-coil
Recommendation
Radiators
Recommendation
Heating-cooling fl oor
3 23 12 2
5 23 12 2
6 23 12 2
8 36 33 15
10 49 44 22
►
DHW circuit
Mandatory : On the cold water inlet, place a safety valve
calibrated to between 7 and 10 bar max. (depending
on local regulations) and connected to a drain pipe
leading to the sewer. The drain pipe must be left open
to the atmosphere. The drain pipe must be installed
in an environment kept frost-free and in a continuous
downward slope. Operate the safety valve according to
manufacturer's specifi cations. The domestic hot water
tank must be fed with cold water passing through a
safety valve. There must be no other valves between
the safety valve and the tank.
We recommend installing a thermostatic mixing valve
on the hot water outlet.
►
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
bleed valve on the hydraulic unit (P) 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", page 50" stage, and
once the machine has started, bleed the hydraulic unit
again (2 litres of water).
Precise fi lling pressure is determined by the
water pressure in the installation.
fi g. 38 - Hydraulic unit automatic bleeder valve
P
Alfea Extensa A.I. R32 / INSTALLATION / 2114 - EN
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