2.4 Restoring heating system pressure.
Periodically check the system water pressure.
e boiler pressure gauge must read a pressure of between
1 and 1.2 bar.
If the pressure falls below 1 bar (with the system cold) restore
normal pressure by means of the cock located at the bottom of
the boiler (see g.).
N.B.: close the cock on completion.
If pressure values reach around 3 bar the safety valve may
be activated.
In this case contact professionally qualied personnel for
assistance.
In the event of frequent pressure drops, contact professionally
qualied personnel for assistance to eliminate the possible
system leak.
2.5 Draining the system.
To drain the boiler, use the special system drain connection
(see detail 21 page 16-17).
Before draining, ensure that the system filler cock is
closed.
2.6 Anti-freeze protection.
e boiler is equipped with an antifreeze function that starts
the pump and the burner when the system water temperature
inside the boiler falls below 4°C. e anti-freeze function is
guaranteed if the boiler is fully operative and not in “block”
status, and is electrically fed with the main switch set to
Summer or Winter. To avoid keeping the system operating in
the event of prolonged absence, the system must be drained
completely or anti-freeze products added to the heating sys-
tem water. In both cases the boiler domestic water circuit
must be drained. In a system subject to frequent draining,
the system must be relled with suitably treated water to
eliminate hardness that can cause the forming of scale.
2.7 Casing cleaning.
Use damp cloths and neutral soap to clean the boiler casing.
Never use abrasive or powder detergents.
2.8 Decommissioning.
In the event of boiler decommissioning, contact profes-
sionally qualied personnel for the relevant operations and
ensure that the electrical, water and gas supply lines are
disconnected.
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